Content deleted Content added
→Potential effects: +image |
|||
Line 56:
CSI is usually embedded in large areas of vertical upward motion. The ideal situation is a geostrophic flow from the South with wind speeds that increase with height. The environment is well mixed and close to saturation. Since the flow is unidirectional, the u component of the wind can be set equal to zero, which establishes a symmetrical flow perpendicular to the temperature gradient in the air mass. This type of flow is typically found in baroclinic atmospheres with cold air to the west.<ref name=Schultz/>
The image to the right shows such a situation in winter with CSI associated with negative equivalent [[potential vorticity]] (<math>\eta \le 0 </math>) near a warm front. Banded snow
forms along the front, near the low pressure area and the CSI.
{{clr}}
===Slantise convection===
[[File:Instabilité symétrique conditionnelle.svg|thumb|Upward movement in an area of CSI gives clouds, downward movement clears the sky.]]
| |||