Standard pressure across the US is a little less than this actually. The average of SLC's pressure is about 30.00 in Hg or what equates to about 1015.92 mb. Sometimes you might hear these units when you are watching a meteorologist talk about hurricanes. Forecasters use in Hg also but we use another unit called a millibar or hectopascal. We use mercury inside the barometer so that's why it's not inches of something else. Pressure is typically read in units called "inches of Mercury" or in Hg. Thus, we standardize the pressure and also this way, everyone understands the pressure readings and we can do our map analyses to help us forecast. If we didn't adjust, it would make analyzing weather maps an enormous pain. We must recall that pressure decreases as we go higher in the atmosphere. If we didn't do this adjustment then places like Salt Lake and Denver would constantly have lower pressure than the rest of the country. Here in the mountain west, we adjust our barometers so they can be read at sea level. Pressure rises and falls are a good indication of what kind of weather may be coming your way. These can be useful for anyone wanting to keep a watch on weather. Then I guess my real question is how come we never seem to see low adjusted pressures, say below 29 in.? Every once in a while I'll adjust the reading to match a weather service report. I'm wondering if I'm calibrating it correctly. It never seems to go into the lower ranges below 29.5 in. Reading or replaying the story in itsĪrchived form does not constitute a republication of the story. Only for your personal, non-commercial use.
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