Re: air press.

I am afraid it is a good deal more complex than your statement suggests.

Air pressure at any level in the atmosphere is a result of the mass of air
above that level being acted upon by gravity. It therefore follows that
variations in pressure are caused by variations in the mass of air above,
which is determined by variations in the mean temperature of the mass.
Thus, an area of low pressure at the earth's surface is overlain by a warm
anomaly at some level above, and conversely, an area of high pressure is
overlain by a cold anomaly. Quite often, the dynamics of the upper
troposphere cause stratospheric air to ascend or descend. The lower
stratosphere being stabily stratified, vertical motions there lead to large
changes in the mean temperature of that layer, so it is not surprising that
the strongest winds and deepest lows are found in the upper troposphere
immediately below the lower stratosphere. While not the only reason for low
and high pressure at the earth's surface, the upper tropospheric pressure
pattern will appear at the earth's surface, modified by the intervening
thermal field.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.btinternet.com/~wokingham.weather/wwp.html
<hartlyuk@xxxxxxxxx> wrote in message
news:1130770747.328863.111020@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> A low press. area is caused by air rising?.
> High press. by falling air?.
>


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