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Science Forum Index » Geology - Meteorology Forum » What causes low pressure systems?...
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| DarkMatter... |
 Posted: Tue Jul 29, 2008 4:49 am |
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As far as i know, in low pressure systems air is rising so there is
less air pressure at the ground. But isn't it a contradiction because
higher in the atmosphere there should be less air pressure than near
the ground. So what causes low pressure systems? |
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| Rodney Blackall... |
| Posted: Tue Jul 29, 2008 3:51 pm |
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In article
<a293b890-a8a9-4b87-a523-1052bab8981c at (no spam) 59g2000hsb.googlegroups.com>,
DarkMatter <darkmatter34 at (no spam) yahoo.com> wrote:
Quote: As far as i know, in low pressure systems air is rising ...
as a general rule, yes
Quote: ... so there is less air pressure at the ground.
Only if the air is being taken away at the top faster than it flows in at
the bottom.
Quote: But isn't it a contradiction because higher in the atmosphere there
should be less air pressure than near the ground.
Surface pressure patterns should be studied with their surroundings. The
pressure at the surface is due to the weight of air above and the weight
depends upon density. If you study a pressure chart for 18,000 ft you will
find that the pressures are roughly half of those below and the patterns
broadly similar, but without fine structure.
Quote: So what causes low pressure systems?
There are several processes which can lead to the formation of low pressure
systems at the surface. You will do better reading an ELEMENTARY text book
on meteorology / weather forecasting (aimed at private pilots or mariners)
than persuing the subject here.
Good luck
--
Rodney Blackall (retired meteorologist)(BSc, FRMetS, MRI)
Buckingham, ENGLAND
Using Acorn SA-RPC, OS 4.02 with ANT INS and Pluto 3.03j |
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