Meteosat 8 IR 10.8 痠 and Theta E 850 hPa

25 May 2005, 12 UTC

High ThetaE values are an indication for instability. The empirically retrieved threshold for severe weather at 850 hPa is the value 320.
A pronounced ThetaE maximum is found over Bulgaria and Greece. Its instability is reflected by bright/white colour in IR 10.8 satellite image showing frontal cloudiness and, even more obvious, a big convective cell at the leading edge of frontal zone. The second two ThetaE maxima can be observed over western and eastern Turkey.