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#1
December 2nd 08, 09:25 AM
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Care needed interpreting 850 hPa temperatures
Many enthusiasts use 850 hPa temperatures as a guide to whether wintry
precip. is likely or not (-5C is a common threshold). This is fine but care is needed when there are large sea level pressure variations. If the pressure is very low (say below 980 hPa) then the 850 hPa level will be closer to the ground and certainly over the sea the 850hPa temperature will be consequently higher. Similarly in high pressure (say above 1020 hPa) the 850 hPa temperature will usually decrease. The best wintry precip. guide IMHO is height of wet-bulb freezing level but this is not readily available in model charts to non-professionals, sadly. Will -- |
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