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How to use a barometer
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Simon Weiss
(SimonGtr) - MLife

Locale: Bay Area
How to use a barometer on 10/09/2009 08:48:41 MDT Print View

Sooooo.....
I've got a nifty altimeter watch (HighGear Altera) that I enjoy using on the trail. I know it requires recalibrating regularly because as weather pressure systems come in it affects the calibration.

It also has a barometer which I know, in theory, can help me predict an incoming storm. You can view either the pressure in either "in Mg" or watch a low res chart for the last few hours (not sure of the actual time scale).

How would I use this to predict the weather on my upcoming hike along the southern section of the JMT + Whitney??

Justin Chaussee
(judach) - F

Locale: Earth
Re: How to use a barometer on 10/09/2009 08:54:53 MDT Print View

The scale ranges from about 28.00 to about 31.00 Hg, or inches of mercury. In very simplified terms, a rapid fall in pressure—bout .10 or more in less than an hour- typically means a storms-a-commin. When the reading remains steady or starts to slowly climb during rain, it typically means fair weather is on it's way.

Edited by judach on 10/09/2009 09:01:34 MDT.

Simon Weiss
(SimonGtr) - MLife

Locale: Bay Area
Easy enough on 10/09/2009 11:40:44 MDT Print View

Thanks, that's easy to remember.

Reginald Donaldson
(worth) - MLife

Locale: Wind River Range
Barometric table on 10/12/2009 19:43:52 MDT Print View

Barometric Forecasting Table

Edited by worth on 10/12/2009 19:48:36 MDT.