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- Newsgroups: sci.geo.meteorology
- Path: sparky!uunet!timbuk.cray.com!walter.cray.com!eastrg2!gwv
- From: gwv@eastrg2.cray.com (George Vandenberghe)
- Subject: Re: Hot humid/dry and Cold humid/dry?
- Message-ID: <1993Jan25.094550.5512@walter.cray.com>
- Lines: 33
- Sender: gwv@eastrg2 (George Vandenberghe)
- Nntp-Posting-Host: eastrg2-gate.cray.com
- Organization: Cray Research, Inc.
- References: <1993Jan23.095958.1@unca.edu>
- Date: 25 Jan 93 09:45:50 CST
-
- I too feel warmer in cold humid weather than in
- cold dry weather especially at night.. Here is what I
- think is going on..
-
- On a cold humid night, there is likely to be a lot
- of infared radiation from the water vapor aloft
- and objects on the surface will probably
- be close to radiative equilibrium i.e outgoing
- infared radiation will be balanced by incoming.
- With human skin, there will still be a net loss
- because it is warmer than the ambient temperature
- but the loss won't be as great.. On a cold
- DRY night, the radiative tempetature of
- the sky is a lot colder and heat loss
- from any surface exposed to the skyy
- will be greater..
- During the day, humidity is negatively
- correlated with sunshine intensity.
- On cold dry days, the sun hits nearby
- objects which radiate and you feel
- mor infared flux from the surrounding
- objects. hence people feel warmer on
- cold dry DAYS..
-
- On the other hand there is more
- convection on dry days, hence more
- mixing and more surface wind which
- makes people feel colder. In
- my mind I compensate more for wind
- and visible light flux than I do for infared
- radiation flux when guessing how warm
- the air really is when I stick my nose
- out in it.
-