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{{Short description|Category 5 Australian region cyclone in 2023}}
{{Hatnote group|
{{For|other tropical cyclones of the same name|Tropical Storm Ilsa}}
{{distinguishDistinguish|TropicalCyclone StormElsa|Cyclone Isa}}
{{Other storms|List of storms named Ilsa|the 2023 Australian region cyclone}}
{{Current weather event|tropical cyclone|date=April 2023}}
}}▼
{{Use dmy dates|date=AprilDecember 2023}}
<!--{{Infobox weather event
| name = Severe Tropical Cyclone Ilsa
| image = Ilsa 2023-04-13 0545Z0830Z.jpg
| caption = Cyclone Ilsa atnear peak intensity off the coastwhile ofapproaching [[Western Australia]] on 13 April
| formed = {{start date|2023|04|0406|df=y}}
| dissipated = Currently{{start activedate|2023|04|15|df=y}}
| basin = Aus
| category = 4
}}{{Infobox weather event/Aus
| winds = 115125
| pressuregusts = 930175
| pressure = 915
}}{{Infobox weather event/JTWC
| winds = 160140
| pressure = 928920
}}{{Infobox weather event/Effects
| damagesyear = 2023
| fatalitiesdamages = 10200000
| damages-prefix = ≥
| deaths = 8
| missing =
| affected = [[Maluku (province)|Maluku]], [[Lesser Sunda Islands]], [[Northern Territory]], [[Western Australia]]
}}{{Infobox weather event/Footer
| season = [[2022–23 Australian region cyclone season]]
}}-->
{{Infobox tropical cyclone current
|name=Severe Tropical Cyclone Ilsa
|AUScategory=Aus4
|AUStype=tropical cyclone
|category=cat4
|type=tropical cyclone
|time=12:00 [[Coordinated Universal Time|UTC]], 13 April 2023
|image=2023 JTWC 18S IR satellite imagery.jpg
|track=2023 JTWC 18S forecast map.sh1823.gif
|lat=-19.4
|lon=119.1
|within_units=10 [[nautical mile|nm]]
|distance_from={{convert|100|km|mi|round=5|abbr=on}} NE of [[Port Hedland, Western Australia|Port Hedland]]<br /> {{convert|70|km|mi|round=5|abbr=on}} NNE of [[Pardoo Station|Pardoo Roadhouse]]
|gusts-position=10sustained
|10sustained={{convert|115|knots|kph mph|round=5|abbr=on}}
|gusts={{convert|160|knots|kph mph|round=5|abbr=on}}
|1sustained={{convert|130|knots|kph mph|round=5|abbr=on}}
|pressure={{convert|928|hPa|inHg|abbr=on|sigfig=4|comma=off}}
|movement=[[Points of the compass|SSE]] at {{convert|8|knots|km/h mph|abbr=on}}
}}
'''Severe Tropical Cyclone Ilsa''' iswas ana active and [[rapid intensification|rapidly intensifying]]powerful [[tropical cyclone]] currentlythat making landfall instruck [[Western Australia]] in April 2023. The [[Tropical cyclone naming|sixth named storm]], and the fifth severe tropical cyclone of the [[2022–23 Australian region cyclone season]], Ilsa formed from a tropical low off the coast of Indonesia on 56 April. It fluctuated in intensity and became a Category 1 tropical cyclone on 11 April, after deep convection became symmetric around the low-level circulation center. Ilsa then rapidly intensified the following day and <!--reached its peak intensity as-->became a Category 5 severe tropical cyclone on the [[Australian tropical cyclone intensity scale]]. Ten-minute sustained winds were estimated as {{convert|115125|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}}, with a central barometric pressure of {{convert|928915|hPa|inHg|abbr=on|sigfig=4|comma=off}}. One-minute sustained winds reached {{convert|130140|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}} at this time, equivalent to a Category 4 major&nbsp;5 hurricane on the [[Saffir–Simpson hurricane wind scale]]. Additionally, record-breaking [[Maximum sustained wind|ten-minute sustained wind speed]] of {{convert|219|km/h|mph|abbr=on}} were measured at [[Bedout Island]], beating the previous record of [[Cyclone George]] in 2007. Ilsa made [[landfall]] roughly {{convert|120|km|mi|round=5|abbr=on}} northeast of [[Port Hedland, Western Australia]]. Inland, Ilsa weakened to a low-end tropical cyclone with {{convert|45|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}} winds. Overall, Ilsa caused over [[United States dollar|US$]]10&nbsp;million in damage, and caused 8 deaths after two boats capsized off the coast of Western Australia.
 
== Meteorological history ==
{{Storm path|Ilsa 2023 path.png|colors=new|note={{refn|group=nb|name=Track|The position of Ilsa's Category&nbsp;5 peak is not depicted in this graphic as it is an asynoptic point (i.e. not at the 6-hour intervals of all other points) occurring at 09:00&nbsp;UTC 13&nbsp;April.}}}}
{{Storm path|Ilsa 2023 path.png|colors=new}}
An active burst of the [[Madden–Julian oscillation]] in conjunction with a westward-propagating equatorial [[Rossby wave]] led to the formation of a tropical low on 6 April. The low—designated 23U by the [[Bureau of Meteorology]] (BoM)—slowly moved southwest around a mid-level [[ridge (meteorology)|ridge]] above north-eastern Australia, as [[atmospheric convection|convection]] persisted near the system's circulation.<ref name="TCR">{{cite report|first1=Matthew|last1=Boterhoven|first2=Linda|last2=Paterson|title=Severe Tropical Cyclone Ilsa|url=http://www.bom.gov.au/cyclone/history/pdf/Ilsa2023_report.pdf|publisher=Australian Bureau of Meteorology|date=6 June 2023|access-date=28 November 2023}}</ref> By the next day, the [[Joint Typhoon Warning Center]] (JTWC) issued a [[Tropical Cyclone Formation Alert]] on the system, citing the slightly favourable environmental conditions encompassing poleward [[outflow (meteorology)|outflow]] and warm [[sea surface temperature]]s (SST) of {{convert|29|-|30|C|F}} subduing high vertical [[wind shear]].<ref>{{cite JTWC|type=TCFA|date=7 April 2023|designation=98S|url=https://www.metoc.navy.mil/jtwc/products/sh9823web.txt|archive-url=https://archive.today/20230407222100/https://www.wis-jma.go.jp/d/o/PGTW/Alphanumeric/Warning/Tropical_cyclone/20230407/200000/A_WTXS21PGTW072000_C_RJTD_20230407201417_38.txt|archive-date=7 April 2023}}</ref> Convection continued to strengthen west of the exposed low-level circulation centre (LLCC) as it scattered under a strong [[temperature gradient]].<ref name="TCR"/> During the following day, the JTWC initiated advisories on the system and classified it as ''Tropical Cyclone 18S''.<ref>{{cite JTWC|designation=18S|type=prog|no=1|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://web.archive.org/web/20230408000000/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=8 April 2023|archive-date=8 April 2023|name=Eighteen|category=tc}} [https://wiki.chlod.net/jtwc/prog/2023-04-08-2020-sh1823prog.txt Alt URL]</ref>
[[File:Ilsa 2023-04-12 0510Z.jpg|thumb|214x214px|Cyclone Ilsa continuing to intensify off the coast of Western Australia on 12 April]]▼
A tropical low was expected to form in the [[Timor Sea|Timor]] or [[Arafura sea]] near northern Australia in the next few days, increasing the potential of tropical cyclone formation in the region.<ref name=":0">{{Cite web|date=4 April 2023|title=Weekly Tropical Climate Note|url=http://www.bom.gov.au/climate/tropical-note/|url-status=live|archive-url=https://web.archive.org/web/20230409000712/http://www.bom.gov.au/climate/tropical-note/|archive-date=9 April 2023|access-date=9 April 2023|website=Australian Bureau of Meteorology}}</ref> During 30 March, the Australian [[Bureau of Meteorology]] (BoM) monitored a developing a tropical low which they classified as 23U.<ref>{{cite report|title=Tropical Cyclone Outlook for the Northern Region, including the Gulf of Carpentaria Issued at 2:15 pm CST on Thursday 30 March 2023 for the period until midnight CST Sunday 2 April 2023|url=http://www.bom.gov.au/wa/forecasts/nwcyclone.shtml|date=30 March 2023|accessdate=4 April 2023|publisher=Australian Bureau of Meteorology|archive-date=4 April 2023|archive-url=https://archive.md/2023.04.04-125454/http://paladinofstorms.net/meteo/archiver2/bom_outlook_north/20230330_0924_bom_outlook_north.html}}</ref> By 5 April, the BoM reported that the tropical low had developed in Arafura Sea.<ref>{{cite report|title=Tropical Cyclone Outlook for the Northern Region, including the Gulf of Carpentaria issued at 2:15 pm CST on Wednesday 5 April 2023|url=http://www.bom.gov.au/nt/forecasts/tcoutlook.shtml|date=5 April 2023|accessdate=7 April 2023|publisher=Australian Bureau of Meteorology|archive-date=7 April 2023|archive-url=http://archive.today/2023.04.07-221540/https://paladinofstorms.net/meteo/archiver2/bom_outlook_north/20230405_0925_bom_outlook_north.html}}</ref> Deep convection persisted in the system's southern semicircles.<ref name="Invest 93S">{{Cite JTWC|date=6 April 2022|time=02Z|type=abio|url=https://www.metoc.navy.mil/jtwc/products/abpwweb.txt|archive-url=https://wiki.chlod.net/jtwc/text/2023-04-06-0020-abioweb.txt
}}</ref> By 7 April, the [[Joint Typhoon Warning Center]] (JTWC) issued a [[Tropical Cyclone Formation Alert]] (TCFA) on the system.<ref>{{cite JTWC|type=TCFA|date=2023-04-07|designation=98S|url=https://www.metoc.navy.mil/jtwc/products/sh9823web.txt|archive-url=http://archive.today/2023.04.07-222100/https://www.wis-jma.go.jp/d/o/PGTW/Alphanumeric/Warning/Tropical_cyclone/20230407/200000/A_WTXS21PGTW072000_C_RJTD_20230407201417_38.txt|archive-date=2023-04-07}}</ref> During the following day, the JTWC initiated advisories on the system and classified it as ''Tropical Cyclone 18S''.<ref>{{cite JTWC|designation=18S|type=prog|no=1|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://wiki.chlod.net/jtwc/prog/2023-04-08-2020-sh1823prog.txt|date=2023-04-08|archive-date=2023-04-08|name=Eighteen|category=tc}}</ref>
 
EasterlyMore verticalconsolidation took place, with spiral [[rainband]]s present in all quadrants of the storm wrapping around the LLCC obscured by a cold [[central dense overcast|dense overcast]] (CDO).<ref>{{cite JTWC|designation=18S|type=prog|no=2|url=https://wiki.chlod.net/jtwc/prog/2023-04-09-0200-sh1823prog.txt|date=8 April 2023|access-date=4 December 2023|name=Eighteen|category=tc}}</ref> Easterly wind shear decreased as a result of the intense convective mass causing upper-level winds around it.<ref>{{cite JTWC|designation=18S|type=prog|no=3|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://web.archive.org/web/20230409122158/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=9 April 2023-04-09|archive-date=9 April 2023-04-09|name=Eighteen}}</ref> AOver [[centralthe densesubsequent overcast]]days, (CDO)the waslow latersteadily revealeddrifted to havethe developedsouthwest, onbut 10due Aprilto aftera deepsurge convectionof becameunfavourable symmetricwind aroundshear, theintensification low-levelwas circulation centerdelayed.<ref name="TCR"/><ref>{{cite JTWC|type=prog|designation=18S|name=Eighteen|category=tc|no=9|date=9 April 2023-04-09|archive-date=9 April 2023-04-09|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://web.archive.org/web/20230409000000/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt}} [https://wiki.chlod.net/jtwc/prog/2023-04-10-2100-sh1823prog.txt}} Alt URL]</ref> LateHowever, onlevels theof nextwind dayshear later diminished, and by late on 11 April, the BoM reported that the symmetrical tropical low had developed into a Category &nbsp;1 tropical cyclone and named it ''Ilsa''.<ref>{{cite web |datename=11 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http:"TCR"//tropicalcyclonedata.net/adv/arch/axau01aprf_020637.txt |publisher=Australian Bureau of Meteorology |access-date=11 April 2023 |archive-date=11 April 2023 |archive-url=https://archive.md/ciVPQ|url-status=live }}</ref> ByThe thatexpanding time,CDO it had developed ancompletely obscured low-levelthe circulation center.<ref>{{citeas JTWC|designation=18S|type=prog|no=11|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://web.archive.org/web/20230411102710/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=2023-04-11|archive-date=2023-04-11|name=Eighteen|category=tc}}</ref>westerly Satellitedry imageryair showedattempted thatto aenter CDOthe wassystem obscuringfrom the LLCCnorth. Consequently, and Ilsa intensified further intobecame a Category &nbsp;1-equivalent tropical cyclone on the [[Saffir–Simpson scale]] (SSHWS).<ref>{{cite JTWC|designation=18S|type=prog|no=1112|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|archive-url=https://wiki.chlod.net/jtwc/prog/2023-04-11-1500-sh1823prog.txt|date=2023-04-11|archive-date= April 2023-04-11|name=Ilsa|category=tc}}</ref> A burst of convection occurred near Ilsa's center during six hours later, and the BoM reported that it briefly strengthened into a Category &nbsp;2 cyclone.<ref>{{cite web |date=11 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://tropicalcyclonedata.net/adv/arch/axau01aprf_111348.txt |publisher=Australian Bureau of Meteorology |access-date=12 April 2023 |archive-date=12 April 2023 |archive-url=https://web.archive.org/web/20230412073429/http://tropicalcyclonedata.net/adv/arch/axau01aprf_111348.txt|url-status=live }}</ref> On the same day, Ilsa rapidly intensified, into a Category &nbsp;3- severe tropical cyclone, within a favorablefavourable environment withof low shear and warm [[sea surface temperature]] (SST).<ref>{{cite web |date=12 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW27600.txt|publisher=Australian Bureau of Meteorology |access-date=12 April 2023 |archive-date=12 April 2023 |archive-url=https://archive.mdtoday/0fuRt20230412083824/http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW27600.txt|url-status=live }}</ref> Ilsa then underwent steady intensification under persistent wind shear, as SST and [[ocean heat content]] increased along the way, with [[cloud top]] temperatures of at least {{convert|-92|C|F}}.<ref>{{cite JTWC|type=prog|designation=18S|name=Ilsa|category=tc|no=13|date=11 April 2023|access-date=5 December 2023|url=https://wiki.chlod.net/jtwc/prog/2023-04-11-2110-sh1823prog.txt}}</ref> A mid-level trough passed south of the system, eroding the steering ridge, and by 12 April, Ilsa changed course to be more southerly.<ref name="TCR"/>
 
Ilsa showsdisplayed an [[eye feature(cyclone)|eye]] seenfeature in [[microwave imaging]], with IIsavortical later[[hot becomingtower]]s aindicating Categoryeye 2-equivalent cyclonedevelopment.<ref>{{cite JTWC|type=prog|no=14|designation=18S|typename=progIlsa|nocategory=15tc|urldate=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt12 April 2023|archiveaccess-date=5 December 2023|url=https://wiki.chlod.net/jtwc/prog/2023-04-12-08100310-sh1823prog.txt|date=2023-04-12|archive-date=2023-04-12|name=Ilsa|category=tc}}</ref> The eye in the symmetric system later became visible on satellite imagery as the [[rainband]]s wrapped around the centerrainbands tightened after intensifying to a Category &nbsp;3-equivalent tropical cyclone.<ref>{{cite JTWC|designation=18S|type=prog|no=17|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=2023-04-12 April 2023|archive-date=2023-04-12 April 2023|archive-url=https://web.archive.org/web/20230412000000/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|name=Ilsa|category=tc}} [https://wiki.chlod.net/jtwc/prog/2023-04-12-2000-sh1823prog.txt|name=Ilsa|category=tc}} Alt URL]</ref> Later the next day, the BoM assessed the storm to have attained ten-minute sustained winds of {{convert|90|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}}, ranking it as a Category &nbsp;4- severe tropical cyclone.<ref>{{cite report|title=Tropical Cyclone Forecast Track Map for Severe Tropical Cyclone Ilsa|url=http://www.bom.gov.au/products/IDW60281.shtml|date=13 April 2023|accessdate=13 April 2023|publisher=Australian Bureau of Meteorology|archive-date=613 FebruaryApril 2023|archive-url=https://archive.mdtoday/hDIQ220230413013007/http://www.bom.gov.au/products/IDW60281.shtml}}</ref> DuringOwing 13 April,to the JTWCsubstantial alsoradial assessedoutflow Ilsaand tovery havewarm attainedSST, andespite intensitymoderate equivalentwind toshear, Ilsa intensified into a Category &nbsp;4-equivalent tropical cyclone on the [[Saffir–SimpsonSSHWS.<ref>{{cite hurricaneJTWC|designation=18S|type=prog|no=18|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=13 scale]]April 2023|archive-date=13 April 2023|archive-url=https://web.archive.org/web/20230413024154/https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|name=Ilsa|category=tc}}</ref> Later that day, Ilsa strengthened further to its peak intensity as a Category&nbsp;5-equivalent tropical cyclone with 1-minute sustained winds of {{convert|115140|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}}.<ref>{{cite JTWCweb |designationtitle=JTWC Best Track on Tropical Cyclone Ilsa (18S|type=prog|no=18) |url=https://www.metocssd.navynoaa.milgov/jtwcPS/productsTROP/sh1823progDATA/ATCF/JTWC/bsh182023.txtdat |url-status=live |access-date=14 April 2023-04-13 |publisher=[[National Oceanic and Atmospheric Administration]] |archive-date=14 April 2023-04-12 |archive-url=https://web.archive.org/web/2023041302415420230414131311/https://www.metocssd.navynoaa.milgov/jtwcPS/productsTROP/sh1823progDATA/ATCF/JTWC/bsh182023.txt|name=Ilsa|category=tcdat }}</ref> An automated weather station on [[Rowley Shoals]] recorded wind gusts up to {{convert|127|kn|km/h mph|abbr=on|order=out|sortable=on}}.<ref>{{Cite news |date=2023-04-13 April 2023 |title=Severe Tropical Cyclone Ilsa to cross WA coast as powerful category five system |language=en-AU |work=ABC News |url=https://www.abc.net.au/news/2023-04-13/wa-cyclone-ilsa-upgraded-category-5-pilbara-kimberley-/102219020 |access-date=2023-04-13 April 2023 |archive-date=13 April 2023 |archive-url=https://web.archive.org/web/20230413071626/https://www.abc.net.au/news/2023-04-13/wa-cyclone-ilsa-upgraded-category-5-pilbara-kimberley-/102219020 |url-status=live }}</ref> Later that same day, Ilsa had become a Category &nbsp;5 severe tropical cyclone with sustained winds of {{convert|110125|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}}.<ref>{{cite weband |date=13the April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW27600.txt|publisher=Australian Bureau of Meteorology |access-date=13 April 2023 |archive-date=13 April 2023 |archive-url=https://archive.md/YGVLL|url-status=live }}</ref> A record-breakinglowest [[Maximumatmospheric sustained wind|ten-minute sustained wind speedpressure]] of {{convert|218915|km/hhPa|mphinHg|sigfig=4|abbr=on}}. wasAround measuredthat at [[Bedout Island]]time, beating the previouseye recordwas ofmeasured [[Cyclonefrom George]]its ininitial 2007.<ref name="Twitter">{{Citeconvert|22|nmi|km tweetmi|numberorder=1646513163763089412out|userabbr=BOM_WA|title=#CycloneIlsaon}} hasto set a new preliminary Australian ten-minute sustained wind speed record of 218km/h at Bedout Island! Cyclone George was the previous record holder with 194km/h back in 2007 at the very same ___location!{{convert|author=Bureau14|nmi|km of Meteorology, Western Australiami|archive-urlorder=https://web.archive.org/web/20230413153012/https://twitter.com/BOM_WA/status/1646513163763089412out|archive-dateabbr=13 April 2023|url-status=liveon}}.<ref name="TCR"/ref>
 
Ilsa made [[landfall]] in a coast {{convert|120|km|mi|abbr=on}} east-northeast of [[Port Hedland]], with 10-minute sustained winds of {{convert|115|kn|km/h mph|order=out|abbr=on|round=5}}.<ref>{{cite web |date=13 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://tropicalcyclonedata.net/adv/arch/axau01aprf_131906.txt|publisher=Australian Bureau of Meteorology |access-date=13 April 2023 |archive-date=13 April 2023 |archive-url=https://web.archive.org/web/20230413211247/http://tropicalcyclonedata.net/adv/arch/axau01aprf_131906.txt|url-status=live }}</ref> Following this, the JTWC discontinued the issuing of advisories of Ilsa, as the storm accelerated inland and rapidly deteriorated from land interaction and high vertical wind shear.<ref>{{cite JTWC|designation=18S|type=warn|no=21|url=https://www.metoc.navy.mil/jtwc/products/sh1823prog.txt|date=13 April 2023|archive-date=14 April 2023|archive-url=https://web.archive.org/web/20230414045851/https://www.metoc.navy.mil/jtwc/products/sh1823web.txt|name=Ilsa|category=tc}}</ref> While over [[Western Australia]], Ilsa weakened to a Category&nbsp;4 severe tropical cyclone with {{convert|95|kn|km/h mph|abbr=on|order=out|round=5|sortable=on}} winds.<ref>{{cite web |date=13 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://tropicalcyclonedata.net/adv/arch/axau01aprf_131906.txt|publisher=Australian Bureau of Meteorology |access-date=13 April 2023 |archive-date=14 April 2023 |archive-url=https://web.archive.org/web/20230414073750/http://tropicalcyclonedata.net/adv/arch/axau01aprf_131906.txt|url-status=live }}</ref> The storm continued to weaken with a deteriorating cloud signature.<ref>{{cite web |date=14 April 2023 |title=Tropical Cyclone Technical Bulletin (Western Region) |url=http://tropicalcyclonedata.net/adv/arch/axau01aprf_131906.txt|publisher=Australian Bureau of Meteorology |access-date=15 April 2023 |archive-date=15 April 2023 |archive-url=https://web.archive.org/web/20230415025742/http://tropicalcyclonedata.net/adv/arch/axau01aprf_140652.txt|url-status=live }}</ref> During 14 April, another mid-level trough enhanced over Western Australia, steering Ilsa south then southeast. Ilsa fell below tropical cyclone strength at 12:00 UTC. Ilsa was last noted on 15 April, with its remnants moving east before dissipating over [[Central Australia]].<ref name="TCR"/>
===Current storm information===
As of&nbsp;12:00&nbsp;UTC 13&nbsp;April, Severe Tropical Cyclone Ilsa is located within 10 nautical miles of {{Coord|19.4|S|119.1|E|name=Ilsa|dim:5000km}} or about {{convert|100|km|mi|round=5|abbr=on}} northeasst of [[Port Hedland, Western Australia|Port Hedland]] and about {{convert|70|km|mi|round=5|abbr=on}} north-northeast of [[Pardoo Station|Pardoo Roadhouse]]. Maximum 10-minute sustained winds are at {{convert|115|kn|round=5}}, with gusts up to {{convert|160|kn|round=5}} while maximum 1-minute sustained winds are at {{convert|130|kn|round=5}}. The minimum central barometric pressure is {{convert|928|hPa|inHg|sigfig=4|comma=off|abbr=on}}, and the system is moving south-southeast at {{cvt|8|kn}}.
 
For the latest official information, see:
*BoM's [http://www.bom.gov.au/products/IDW60281.shtml Tropical Cyclone Forecast Track Map of Severe Tropical Cyclone Ilsa]
*BoM's [http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW27600.txt Tropical Cyclone Technical Bulletin of Severe Tropical Cyclone Ilsa]
*JTWC's [https://www.metoc.navy.mil/jtwc/products/sh1823web.txt Tropical Cyclone Warning on Tropical Cyclone 18S (Ilsa)]
 
==== Watches and warnings ====
{{Australian cyclone warnings table
| Cyclone Warning=
* [[Australia]]
** [[Western Australia]]▼
*** [[Bidyadanga Community, Western Australia|Bidyadanga]] to [[Whim Creek, Western Australia|Whim Creek]], including [[Port Hedland, Western Australia|Port Hedland]] but not including Bidyadanga, and extending inland past [[Kunawarritji Community, Western Australia|Kunawarritji]], including [[Nullagine, Western Australia|Nullagine]], [[Marble Bar, Western Australia|Marble Bar]], [[Parnngurr Community|Parnngurr]] and [[Telfer, Western Australia|Telfer]]
| Cyclone Watch=
* [[Australia]]
** [[Western Australia]]
*** Inland areas to [[Kiwirrkurra Community, Western Australia|Kiwirrkurra]], and southwest of [[Balgo, Western Australia|Balgo]]
| Flood Watch=
* [[Australia]]
** [[Western Australia]]
*** West Kimberley Rivers, Warburton District Rivers, Salt Lakes District Rivers, and Western Desert
| Source=
[http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW24100.html Tropical Cyclone Advice (WA)] <br/> [http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDW39605.html Flood Watch (WA)]
▲}}
{{clear}}
 
== Preparations and impact ==
Gale-force winds with gusts up to {{convert|90|kn|km/h mph|order=out|abbr=on|round=5|sortable=on}}, and heavy rain might occur on 9 April between [[Kalumburu]] and [[Kuri Bay]] in the state's north.<ref name=":Gale-force">{{Cite web |date=2023-04-09 |title=Tropical cyclone ‘Ilsa’ could hit parts of WA coast |url=https://www.watoday.com.au/national/western-australia/tropical-cyclone-ilsa-could-hit-parts-of-wa-coast-20230409-p5cz4m.html |access-date=2023-04-09 |website=WAtoday |language=en |archive-date=9 April 2023 |archive-url=https://web.archive.org/web/20230409211105/https://www.watoday.com.au/national/western-australia/tropical-cyclone-ilsa-could-hit-parts-of-wa-coast-20230409-p5cz4m.html |url-status=live }}</ref> Squally thunderstorms are also anticipated in far northern [[Kimberley (Western Australia)|Kimberley]].<ref name=":Gale-force" /> Residents across the coast of [[Pilbara]] evacuated as high tides, large waves and inundation were possible.<ref>{{cite news|publisher=Alarabiya News|title=Cyclone Ilsa: Residents flee as intensifying cyclone approaches northwest Australia|date=12 April 2023|access-date=12 April 2023|url=https://english.alarabiya.net/News/world/2023/04/12/Cyclone-Ilsa-Residents-flee-as-intensifying-cyclone-approaches-northwest-Australia|archive-date=12 April 2023|archive-url=https://web.archive.org/web/20230412223818/https://english.alarabiya.net/News/world/2023/04/12/Cyclone-Ilsa-Residents-flee-as-intensifying-cyclone-approaches-northwest-Australia|url-status=live}}</ref> In anticipation of Ilsa, the BoM issued a warning for [[Western Australia]]’s Kimberley and [[Pilbara]] regions.<ref>{{Cite web |last=Jarred |first=Cross |date=12 April 2023 |title=Pilbara and Kimberely prepare to shelter as Cyclone Ilsa reaches category 3, continues towards coast |url=https://nit.com.au/12-04-2023/5577/pilbara-and-kimberely-prepare-to-shelter-as-cyclone-ilsa-reaches-category-3-continues-towards-coast |url-status=live |access-date=13 April 2023}}</ref> ▼
 
▲[[File:Ilsa 2023-04-12 0510Z.jpg|thumb|214x214px|Cyclone Ilsa continuing to intensify off the coast of Western Australia on 12 April]]
Extra emergency workers, aircraft and essential supplies have also been sent to the region.<ref>{{Cite web |title=Western Australia battens down as Cyclone Ilsa gathers strength |url=https://www.1news.co.nz/2023/04/12/western-australia-battens-down-as-cyclone-ilsa-gathers-strength/ |access-date=2023-04-13 |website=1 News |language=en |archive-date=12 April 2023 |archive-url=https://web.archive.org/web/20230412085325/https://www.1news.co.nz/2023/04/12/western-australia-battens-down-as-cyclone-ilsa-gathers-strength/ |url-status=live }}</ref> On 12 April, the [[Department of Fire and Emergency Services]] (DFES) issued a cyclone yellow alert, and urged residents to be prudent and to take action and prepare to shelter.<ref>{{Cite web |last=Anderson |first=Anthony |date=13 April 2023 |title=Tropical Cyclone Ilsa intensifies further to category 4 system |url=https://www.news.com.au/national/western-australia/tropical-cyclone-ilsa-intensifies-further-to-category-4-system/news-story/2c5874ad015fa89e0ce1959b49b1b3b2 |url-status=live |access-date=13 April 2023}}</ref> At least 700 residents were being evacuated to cyclone shelters prior to the storm.<ref>{{Cite news |date=2023-04-13 |title=Cyclone Ilsa: Western Australia braces for category 4 storm |language=en-GB |work=BBC News |url=https://www.bbc.com/news/world-australia-65259342 |access-date=2023-04-13 |archive-date=13 April 2023 |archive-url=https://web.archive.org/web/20230413041807/https://www.bbc.com/news/world-australia-65259342 |url-status=live }}</ref> [[Town of Port Hedland|Port Hedland]] mayor Peter Carter said damaging winds could turn flying debris into "missiles in the air".<ref>{{Cite web |title=Australia’s northwest braces for strongest cyclone in a decade |url=https://www.aljazeera.com/news/2023/4/13/australias-northwest-braces-for-strongest-cyclone-in-a-decade |access-date=2023-04-13 |website=www.aljazeera.com |language=en}}</ref>▼
 
▲Gale-force winds with gusts up to {{convert|90|kn|km/h mph|order=out|abbr=on|round=5|sortable=on}}, and heavy rain might occur on 9 April between [[Kalumburu]] and [[Kuri Bay]] in the state's north.<ref name=":Gale-force">{{Cite web |date=9 April 2023-04-09 |title=Tropical cyclone ‘Ilsa’'Ilsa' could hit parts of WA coast |url=https://www.watoday.com.au/national/western-australia/tropical-cyclone-ilsa-could-hit-parts-of-wa-coast-20230409-p5cz4m.html |access-date=9 April 2023-04-09 |website=WAtoday |language=en |archive-date=9 April 2023 |archive-url=https://web.archive.org/web/20230409211105/https://www.watoday.com.au/national/western-australia/tropical-cyclone-ilsa-could-hit-parts-of-wa-coast-20230409-p5cz4m.html |url-status=live }}</ref> Squally thunderstorms are also anticipated in far northern [[Kimberley (Western Australia)|Kimberley]].<ref name=":Gale-force" /> Residents across the coast of [[Pilbara]] evacuated as high tides, large waves and inundation were possible, along with a highway closure along the Pilbara coast.<ref>{{cite news|publisher=Alarabiya News|title=Cyclone Ilsa: Residents flee as intensifying cyclone approaches northwest Australia|date=12 April 2023|access-date=12 April 2023|url=https://english.alarabiya.net/News/world/2023/04/12/Cyclone-Ilsa-Residents-flee-as-intensifying-cyclone-approaches-northwest-Australia|archive-date=12 April 2023|archive-url=https://web.archive.org/web/20230412223818/https://english.alarabiya.net/News/world/2023/04/12/Cyclone-Ilsa-Residents-flee-as-intensifying-cyclone-approaches-northwest-Australia|url-status=live}}</ref><ref>{{Cite web |last= |first= |title=Australia's most powerful cyclone in 8 years to cross coast |url=https://abcnews.go.com/Technology/wireStory/category-4-cyclone-ilsa-lashes-northwest-australian-coast-98547185 |access-date=14 April 2023 |website=ABC News |language=en |archive-date=14 April 2023 |archive-url=https://web.archive.org/web/20230414102504/https://abcnews.go.com/Technology/wireStory/category-4-cyclone-ilsa-lashes-northwest-australian-coast-98547185 |url-status=live }}</ref> In anticipation of Ilsa, the BoM issued a warning for [[Western Australia]]’s Kimberley and [[Pilbara]] regions.<ref>{{Cite web |last=Jarred |first=Cross |date=12 April 2023 |title=Pilbara and Kimberely prepare to shelter as Cyclone Ilsa reaches category 3, continues towards coast |url=https://nit.com.au/12-04-2023/5577/pilbara-and-kimberely-prepare-to-shelter-as-cyclone-ilsa-reaches-category-3-continues-towards-coast |url-status=live |access-date=13 April 2023}}</ref>
 
▲ExtraAdditional emergency workers, aircraft and essential supplies have also been sent to the region.<ref>{{Cite web |title=Western Australia battens down as Cyclone Ilsa gathers strength |url=https://www.1news.co.nz/2023/04/12/western-australia-battens-down-as-cyclone-ilsa-gathers-strength/ |access-date=2023-04-13 April 2023 |website=1 News |language=en |archive-date=12 April 2023 |archive-url=https://web.archive.org/web/20230412085325/https://www.1news.co.nz/2023/04/12/western-australia-battens-down-as-cyclone-ilsa-gathers-strength/ |url-status=live }}</ref> On 12 April, the [[Department of Fire and Emergency Services]] (DFES) issued a cyclone yellow alert, and urged residents to be prudent and to take action and prepare to shelter.<ref>{{Cite web |last=Anderson |first=Anthony |date=13 April 2023 |title=Tropical Cyclone Ilsa intensifies further to category 4 system |url=https://www.news.com.au/national/western-australia/tropical-cyclone-ilsa-intensifies-further-to-category-4-system/news-story/2c5874ad015fa89e0ce1959b49b1b3b2 |url-status=live |access-date=13 April 2023}}</ref> At least 700 residents were being evacuated to cyclone shelters prior to the storm.<ref>{{Cite news |date=2023-04-13 April 2023 |title=Cyclone Ilsa: Western Australia braces for category 4 storm |language=en-GB |work=BBC News |url=https://www.bbc.com/news/world-australia-65259342 |access-date=2023-04-13 April 2023 |archive-date=13 April 2023 |archive-url=https://web.archive.org/web/20230413041807/https://www.bbc.com/news/world-australia-65259342 |url-status=live }}</ref> [[Town of Port Hedland|Port Hedland]] mayor Peter Carter said damaging winds could turn flying debris into "missiles in the air".<ref>{{Cite web |title=Australia’sAustralia's northwest braces for strongest cyclone in a decade |url=https://www.aljazeera.com/news/2023/4/13/australias-northwest-braces-for-strongest-cyclone-in-a-decade |access-date=2023-04-13 April 2023 |website=www.aljazeera.com |language=en}}</ref>
 
Western Australia's Emergency Department on 15 April assessed damage from Ilsa,<ref>{{Cite news |last= |date=15 April 2023 |title=Western Australia assesses Cyclone Ilsa's 'path of destruction' |language=en |work=Reuters |url=https://www.reuters.com/world/asia-pacific/western-australia-assesses-cyclone-ilsas-path-destruction-2023-04-15/ |access-date=15 April 2023 |archive-date=15 April 2023 |archive-url=https://web.archive.org/web/20230415145604/https://www.reuters.com/world/asia-pacific/western-australia-assesses-cyclone-ilsas-path-destruction-2023-04-15/ |url-status=live }}</ref> with at least eight personnel were sent to the Great Northern Highway fires near Pippingarra.<ref>{{Cite news |date=14 April 2023 |title=Engineers to assess how to cyclone-proof outback buildings as Ilsa clean-up gets underway |language=en-AU |work=ABC News |url=https://www.abc.net.au/news/2023-04-15/cylone-ilsa-clean-up-continues-in-the-pilbara/102223024 |access-date=15 April 2023 |archive-date=14 April 2023 |archive-url=https://web.archive.org/web/20230414212520/https://www.abc.net.au/news/2023-04-15/cylone-ilsa-clean-up-continues-in-the-pilbara/102223024 |url-status=live }}</ref> The manager of [[Pardoo Station]] claimed that the estimated damage was at least [[Australian dollar|A$]]15&nbsp;million (US$10.2&nbsp;million).<ref>{{cite news|last=Stanley|first=Michelle|url=https://www.abc.net.au/news/2023-06-15/pardoo-station-tropical-cyclone-ilsa-damage-clean-up-continues/102470386|title=Cyclone Ilsa clean-up continues on billion-dollar Pardoo Station after 'mind-boggling' damage|work=ABC News|date=15 June 2023|access-date=15 June 2023|archive-url=https://web.archive.org/web/20230615011209/https://www.abc.net.au/news/2023-06-15/pardoo-station-tropical-cyclone-ilsa-damage-clean-up-continues/102470386|archive-date=15 June 2023|url-status=live}}</ref> Five accommodation sheds were entirely blown away by the storm at the Pardoo Roadhouse, and emergency officials have been unable to locate them.<ref>{{Cite web |title=Cyclone Ilsa leaves million-dollar damage bill after record winds but storm threat 'not over yet' |url=https://www.9news.com.au/national/cyclone-ilsa-update-warning-tropical-storm-downgraded-record-wind-gusts-western-australia-northern-territory/acbf886e-e62c-4aec-b840-62700e37ea8d |url-status=live |archive-url=https://web.archive.org/web/20230414104949/https://www.9news.com.au/national/cyclone-ilsa-update-warning-tropical-storm-downgraded-record-wind-gusts-western-australia-northern-territory/acbf886e-e62c-4aec-b840-62700e37ea8d |archive-date=14 April 2023 |access-date=15 April 2023 |website=www.9news.com.au}}</ref> The Roadhouse suffered an estimated AU$4 million in damage, with the roof being torn off and recently-installed solar panels being blown away during the cyclone.<ref>{{Cite web |last=Stanley |first=Michelle |last2=Gudgeon |first2=Kelly |date=10 January 2024 |title=Pardoo Roadhouse cyclone recovery 'sabotaged' after multiple break-ins, leaving owners 'angry and devastated' |url=https://www.abc.net.au/news/2024-01-10/pardoo-roadhouse-wa-break-ins-cyclone-recovery/103304650 |access-date=11 February 2025 |website=[[Australian Broadcasting Corporation]]}}</ref><ref name=":0">{{Cite web |last=Walsh |first=Kayla |date=20 March 2024 |title=Pardoo Roadhouse reopens a year on from Cyclone Ilsa devastation |url=https://bigrigs.com.au/2024/03/20/pardoo-roadhouse-reopens-a-year-on-from-cyclone-ilsa-devastation/ |access-date=11 February 2025 |website=www.bigrigs.com.au}}</ref> The Roadhouse reopened for business in March 2024.<ref name=":0" /> Apart from Pardoo, acting emergency services minister Sue Ellery said that the damage caused by Ilsa was "fairly minimal."<ref>{{Cite web |date=14 April 2023 |title=Powerful Cyclone Ilsa lashes Australia's northwest coast |url=https://wtop.com/australia/2023/04/powerful-cyclone-ilsa-lashes-australias-northwest-coast/ |access-date=15 April 2023 |website=WTOP News |language=en |archive-date=15 April 2023 |archive-url=https://web.archive.org/web/20230415145600/https://wtop.com/australia/2023/04/powerful-cyclone-ilsa-lashes-australias-northwest-coast/ |url-status=live }}</ref>
 
Two boats containing 19 men total illegally fishing off the coast of Western Australia were caught in the cyclone. One of the boats was found shipwrecked on [[Rowley Shoals|Bedwell Island]], while the other boat sank. The 11 people on the shipwrecked boat were rescued, while one survivor was found from the sunken boat. The other 8 fishermen died.<ref>{{Cite news |last1=Murphy |first1=Hannah |last2=Barker |first2=Anne |last3=Brann |first3=Matt |last4=Bieundurry |first4=Tallulah |date=3 May 2023 |title=Indonesian fishermen who survived cyclone that killed eight off WA coast won't face charges |language=en-AU |work=ABC News |url=https://www.abc.net.au/news/2023-05-03/australian-government-wont-charge-indonesian-fishers-shipwreck/102296416 |access-date=10 May 2023}}</ref>
 
==Retirement==
As a result of the damage associated with the storm, the name ''Ilsa'' was removed from the list of Australian region cyclone names and will never be used again for a tropical cyclone in that basin. It was replaced by ''Isabella'' for future seasons.{{RA V Tropical cyclone operational plan}}
 
== See also ==
Line 93 ⟶ 60:
*[[Tropical cyclones in 2023]]
*[[Weather of 2023]]
*[[Cyclone JoanIlona]] (19751988)
*[[Cyclone Orson]] (1989) – a powerful tropical cyclone that had a similar path and intensity.
*[[Cyclone John]] (1999)
*[[Cyclone Inigo]] (2003)
*[[Cyclone George]] (2007)
*[[Cyclone Laurence]] (2009)
*Cyclones [[Cyclone LuaHeidi|LuaHeidi]] (2012) and [[Cyclone RustyLua|RustyLua]] (20132012) – two severe tropical cyclones which both made landfall around [[Pardoo Station|Pardoo]] within the spacespan of atwo yearmonths.
*[[Cyclone Kelvin]] (2018) – the previous severe tropical cyclone to make landfall between Broome and Port Hedland prior to Ilsa.
*[[Cyclone Veronica]]Zelia (20192025) ]] – a large and powerful tropical cyclone whichthat broughthad impactsa tosimilar Westernpath Australia during March 2019, though did not makeand landfallintensity.
{{clear}}
 
== Notes ==
{{reflist|group=nb}}
 
==References==
Line 110 ⟶ 79:
{{commons category|Cyclone Ilsa (2023)}}
* [http://www.bom.gov.au/cyclone/ Australian Bureau of Meteorology]
* [https://web.archive.org/web/20171222221633/http://www.metoc.navy.mil/jtwc/jtwc.html Joint Typhoon Warning Center]
* [http://meteo.bmkg.go.id/siklon Tropical Cyclone Warning Center Jakarta] {{in lang|id}}
* [http://www.pngmet.gov.pg Papua New Guinea National Weather Service]
Line 116 ⟶ 85:
{{2022–23 Australian region cyclone season buttons}}
{{Category 5 Australian region tropical cyclones}}
{{Retired Australian region cyclones}}
 
{{DEFAULTSORT:Ilsa}}
[[Category:2023 meteorology]]
[[Category:2022–23 Australian region cyclone season]]
[[Category:April 2023 events in Australia]]
[[Category:2023 disasters in Australia]]
[[Category:Tropical cyclones in 2023]]
[[Category:Tropical cyclones in Western Australia]]
[[Category:Category 5 Australian region cyclones]]
▲** [[Category:2020s in Western Australia]]
Retrieved from "https://en.wikipedia.org/wiki/Cyclone_Ilsa"