FRONT INTENSIFICATION BY JET CROSSING - KEY PARAMETERS
by ZAMG
- Positive vorticity advection (PVA):
The enhanced cloudiness in the left exit region is superimposed by a fairly strong maximum of PVA at 300 hPa. - Shear vorticity at 300 hPa:
The cloud field of the Front Intensification by Jet Crossing is at the cyclonic side of the zero line of the shear vorticity at 300 hPa, which indicates the jet axis. - Isotachs:
The increased cloudiness is within the left exit region of a well developed jet streak. - Thermal front parameter (TFP):
The thermal front parameter indicating the Cold Front, and the zero line of the shear vorticity indicating the jet axis, form an acute angle, sometimes nearly perpendicular.
|
17 May 1995/06.00 UTC - Meteosat IR image; red: positive vorticity advection (PVA) 300 hPa, yellow:
isotachs 300 hPa
|
|
|
|
