Can anyone explain what low pressure means in terms of the weather?
Can anyone explain what high preassure means in terms of the weather?
How is it that we have anti-cyclones and stuff like this?
Thanks for reading and please post
2007-05-24 05:45:09 · 7 answers · asked by Dr A. Vencicio 2 in Science & Mathematics ➔ Weather
The weather systems are caused by uneven heating of the Earths surface, and the rotation of the Earth.
In the Northern hemisphere a Low (or anti-cyclone) revolves in an anti-clockwise direction. A High (or cyclone) revolves in a clockwise direction.
These rotations are reversed in the Southern Hemisphere.
Anticyclones tend to have lower pressures than Cyclones - hence the common names High and Low!
Extreme Lows are called Hurricanes in the Atlantic.
There are 3 other types of pressure system - ridge (High Pressure), Trough (Low) and a Col - an area between 2 Highs and 2 Lows.
Hope that helps
2007-05-24 05:59:55 · answer #1 · answered by Trevor h 6 · 1⤊ 1⤋
Low pressure is considered a valley, while high pressure is referred to as a hill. Low pressure is where storm are, they are usually associated with a cold front, marked by a blue spike line, this brings rainy and if the low is strong enough, which is indicated by a falling barometer, winds could be damaging. High pressure is usually associated with very nice weather, however there are some occasions where the weather can be a bit wet, then we call that a dirty high. The anti cyclones are the way the storm rotate, in the Northern hemisphere, they usually are counter clockwise. However, not all low pressure give rain, here in the West Coast, we can get rather hot with what we call a heat low, or thermal low.
2007-05-24 14:03:48 · answer #2 · answered by trey98607 7 · 0⤊ 1⤋
Low pressure is an area of rising air. Rising air is unstable and that is why a low pressure area is usually associated with bad weather.
High pressure is an area of descending air. Descending air is stable and a high pressure area (dome) is associated with fair weather.
Cyclones are areas of a rotating air mass. Tornadoes are often called cyclones. Hurricanes in the Indian Ocean are called cyclones.
Storms that develop away from the equator/tropics are called extratropical cyclones. Anti-cyclones is a misused word but does mean a fair weather high pressure area.
2007-05-24 13:15:33 · answer #3 · answered by DaveSFV 7 · 0⤊ 1⤋
Standard atmopheric pressure is 1013 millibars at sea level. This is approx 14.7 psi. If the air pressure is less than this it is a low pressure, and conversely it is a high pressure.
When we get a low pressure system, it means that the air is rising, and lowering the pressure felt at the surface, typical values are 980 to 1000 mb for a low pressure. This is not a big change, and cannot be felt by our human senses. Low pressure means cloud formation, and rain. When the pressure is above say 1020 mb, it is a high pressure, this means the air is sinking and increasing the pressure felt at the surface. High pressure generally gives no cloud or rainfall, but atmospheric pollution is much greater, and fogs in the morning. Anti cyclone is another name for high pressure. Cyclone is a low pressure.
2007-05-24 06:06:56 · answer #4 · answered by john r 3 · 0⤊ 1⤋
Manic depression, another name for it is bipolar, is where you can be intensely depressed and then right away have a time where you feel really high - like you would be able to get up in the middle of the night and paint your bedroom (if you wanted to). The mania times are usually when people will go on shopping/spending sprees (be careful!). Most good antidepressants have to be titrated (increased gradually) until you are at full dose. Follow your doc's instructions carefully. I would say please stay on it until you're at full dose. Oftentimes "anti-D's" take 4-6 weeks before you feel an improvement. Also, it's not safe to stop taking your medication cold turkey, because some of them can give you "rebound effects". Whatever medication you find that works for you, can probably be purchased in the generic form and therefore be less expensive - just as your pharmacist, or tell your doc you want him to write the Rx for a generic equivalent.
2016-04-01 05:59:48 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Low pressures are associated with stormy weather, where as highs are clear weather. Anti-cyclones are simply another name for a high pressure.
2007-05-24 06:44:52 · answer #6 · answered by grotonweather 1 · 1⤊ 2⤋
Low pressure is sinking air and high pressure is rising air.
Low pressure the air circulation is counter clockwise, and high pressure the circulation of air is clock wise.
Moisture is associated with low pressure, and sunny weather (low moisture) is associated with the high pressure.
2007-05-24 05:56:32 · answer #7 · answered by Mz. B 2 · 0⤊ 3⤋