[wxqc] barometer readings - limited data forecasting

[dshelms at comcast.net]

Hi Jim,

Before computer weather models (and even satellites) were widely available and reasonably accurate just 20 years ago, the were lots of rules-of-thumb forecasters used to predict the weather (not always well).  The rules for pressure fall are equally accurate over water as land, assuming there are  hurricanes/typhoons in the area you happen to be in.  Mid-latitude storms have the same fall/rise signture, but not the same amount of change as hurricanes.  I'll look for sources for R-O-Ts like these.  

Sam pointed out the UIUC web page for bedtime reading, here is another "old school" source, the US Navy's Aerographer Mate course material
http://www.tpub.com/content/aerographer/

The material is probably 20 years old, but those swabbies can write some good stuff!

Dave
CW0351

 -------------- Original message ----------------------
From: "jim" <jimwc at frontiernet.net>
> A friend of mine and I are discussing the relativity of the barometer rise
> and fall and the correlation of an impending storm.
> I found a barometer rate chart on a sailing web site and it said that .06
> inch in 3 hours meant a storm was impending, .15 inch in 3 hours meant a
> strong storm, and .30 inch in 3 hours meant a extreme storm. it did not
> mention if it was a rise or fall, I assume it is a falling pressure. is this
> a good rule of thumb or does it just pertain to out on the water and not
> over land. is there any way to predict a storm/rain by watching the
> barometer over a period of time.
> 
> thanks
> Jim
> CW4367



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