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Alex

I have a topo map for our area.  My apartment is just about 705 feet above
sea level.  Yours should be close, perhaps a bit lower.  The Wabash river in
is approx. 520 ft in Lafayette/West Lafayette.  Will look up your place if
you wish.

According to USA Today:

http://www.usatoday.com/weather/resources/askjack/wfaqpres.htm

"The pressure reported for Denver, or any official observation station for
that matter, is not the actual pressure on the surface, but rather is the
pressure corrected to sea level. The reason this is done is so that
meaningful maps of constant pressure lines, called isobars, can be drawn for
stations across the USA. These maps are useful for picking out areas of
relative high and low pressure. If pressure readings were not corrected,
places like Denver would almost always have lower pressure than spots at
lower elevations. Essentially, the map would reflect topography, rather than
weather systems in the atmosphere."

A while back Frank, if I recall, gave a method for converting the broadcast
barometric pressure to local station pressure.

On a calculator divide your altitude above see level by -32000 (maybe
-34000?).  Then hit (on my TI-30XA) 2nd then LN.  (You are looking for e^x,
the mathematically inclined can say it better, but that's the cookbook
method).

Multiply the broadcast pressure by the above result to get local (station)
pressure.  I use it with inches Hg, so not sure if it also works in
millibars, but don't see why it would not.  Perhaps Frank can clear up my
fuzzy memory.

There is some interesting information a well as a formula at:

http://en.wikipedia.org/wiki/Atmospheric_pressure

Bill


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