SkyStef's weather page
500 hPa height + temperatures & mean sea level pressure + thickness 1000-500 hPa
Run of 00 UTC
Run of 12 UTC
500 hPa map
Black lines + values height = contour 500 hPa each 8 gpdam
Useful for: trough & ridge pattern propagation (long waves) and short waves, steering pattern of frontal systems, detect cold and warm air masses, and estimate stability of atmosphere (stable with warm upper air, unstable with cold upper air).
White (or black) lines
= mean sea level pressure isobars each
5 hPa (hectopascal).
Useful for: combination thickness and mean sea level pressure will
show areas experiencing advection of cold air (CAA) with low thickness
values or advection of warm air (WAA) with high thickness values. This has
effect on the low level temperatures which will increase in WAA and decrease
in CAA. Certain thickness values mark air masses eventually separated by
fronts: 570 tropical air, 546 = polar front, 510 arctic front.
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