is it when the barometer is rising or falling that rain/storm is coming?are there numbers (like 29 in. and falling) that mean a storm is closer?Sorry, I'm not really familiar with this.
2006-12-26 05:10:49 · 4 answers · asked by L.T. 4 in Science & Mathematics ➔ Weather
A barometer is commonly used for weather prediction, as high air pressure in a region indicates fair weather while low pressure indicates that storms are more likely. Simultaneous barometric readings from across a network of weather stations allow maps of air pressure to be produced. Isobars drawn on such a map links sites with the same pressure and give, in effect, a contour maps of areas of high and low pressure. Localized high atmospheric pressure acts as a barrier to approaching weather systems, diverting their course. Low atmospheric pressure, on the other hand, represents the path of least resistance for a weather system, making it more likely that low pressure will be associated with increased storm activities.
Low pressure actually draws the storm(Like sucking liquid up a straw)....it is not the storm that CAUSES the low pressure. High pressure zones tend to push storm fronts away from the area.
2006-12-26 10:56:06 · answer #1 · answered by newsgirlinos2 5 · 1⤊ 0⤋
Weather forecasting is complicated; a look at the barometer is (unfortunately?) not enough to say something about the coming weather...
There is no fixed "number" that means bad weather or fair weather. (Sometimes the barometers are marked with "bad weather", "fair weather", and "changing"; this is something that really shouldn't be taken very seriously.) However, keeping track of how the air pressure changes may give you a clue.
Generally, when rain/snow/storm is approaching, the air pressure decreases. (The opposite is not always true, though - when the air pressure decreases, it doesn't necessarily mean that bad weather is coming.)
2006-12-26 13:53:41 · answer #2 · answered by Barret 3 · 1⤊ 1⤋
If the pressure is falling, it means that the pressure has lowered in the last hour. A slight dip in air pressure doesnt necessarily mean that the weather will turn bad but if this trend continues, you may be in for some unsettled weather.
2006-12-26 21:14:50 · answer #3 · answered by absolutebalderdash1 2 · 0⤊ 0⤋
Usually falling - moist air has a lower density than dry air, so the pressure drops when moist air approaches.
2006-12-26 13:14:26 · answer #4 · answered by formerly_bob 7 · 0⤊ 1⤋