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Tracking 90L off the coast of central Florida. Low odds but likely blustery and very wet, regardless. Flooding the greatest risk with this one.
Days since last H. Landfall - US: Any 286 (Idalia) , Major: 286 (Idalia) Florida - Any: 286 (Idalia) Major: 286 (Idalia)
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Archives 2002-2009 >> 2002 Storm Forum
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wxman007
Meteorologist


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Posts: 617
Loc: Tuscaloosa, AL
Re: Question for the Meteorologists out there...
      Fri May 31 2002 04:24 PM

Not really, but I'll try to explain...

Because the surface of the earth is NOT uniform (i.e. it varies in altitude) we use pressure readings at the surface. However, above the surface of the earth, we use CONSTANT PRESSURE levels instead....that is what is meant by the 925, 850 etc. It is algebraicly more convienient to use constant pressure instead of altitude. So when you see the term 500mb height (or any other pressure level) it means that that is the height (in dekameters or meters) at which the air pressure reaches 500mb....it's the opposite of sea level pressure.

Did that help?

--------------------
Jason Kelley


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* Question for the Meteorologists out there... Steve Fri May 31 2002 04:24 PM
. * * Re: Question for the Meteorologists out there... wxman007   Fri May 31 2002 04:24 PM
. * * Re: Question for the Meteorologists out there... Steve   Fri May 31 2002 08:52 PM

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