Excellent site that explains the 500 hpa charts,
http://myweb.tiscali.co.uk/franksweather/500_hpa.html
On a nice pleasant day the 500 hpa chart will show yellow or orange color ontop of Jordan, indicating that the first half of the atmosphere lies within the first 5700 meters above sea level and takes up more volume indicating it is warmer than normal.
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Basically, if you look at our Firday storm, it says that half of the atmosphere is found in the first 5500 meters above sea level (Green color) which means that it takes up little volume indicating that it is colder than normal
This helps us conclude that even if the 850 hpa chart shows a 0 or 1 degree at 1500 meters above Jordan on Friday and Saturday ==> indicating temperatures around 3 - 4 degrees centigrade in Amman does not mean that its too warm for snow.
This is because the atmosphere above that is relatively colder and has not been affected as much by crossing over the mediteranian sea. which means there is a higher chance of snow.
Even if it does snow, as the temperature in the lower atmosphere is relatively warm, accumulations will be unlikely and if so will not last long.
Inshalla things turn to the better,
Salam,
Adnan
رد: (( مناقشة الاحوال الجوية )) خاص بالاعضاء(النصف الثاني من فبراير/شباط 2009) ج2
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