12 - 13 NOVEMBER 1997 - RELATIVE STREAMS

by ZAMG

12 November 1997/18.00 UTC - Meteosat IR image; position of vertical cross section indicated	12 November 1997/18.00 UTC - Vertical cross section; black: isentropes (ThetaE), orange thin: IR pixel values, orange thick: WV pixel values


12 November 1997/18.00 UTC - Meteosat IR image; black: shear vorticity 300 hPa, magenta: relative streams 312K - system velocity 232° 11 m/s, yellow: isobars

Few if any changes took place involving different relative streams (left image bottom). The most important facts can be summarised as follows:

The rising Warm Conveyor Belt is responsible for the cloudiness over the Balkan Peninsula in front of the frontal system;
Both relative streams from behind the front are involved in the frontal cloud band;
A dry air stream connected with the crossing jet streak on its cyclonic side penetrates into the area in front of the frontal cloud band over Tunisia and the adjacent Mediterranean Sea.