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Which came first? The low pressure or the storm?

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September 17th 04, 05:12 PM posted to sci.geo.meteorology,uk.sci.weather

O18-C-O16

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Which came first? The low pressure or the storm?

(O18-C-O16) wrote in message . com...
Joe wrote in message . ..
The chicken or the egg?

Which came first? The low pressure or the storm?

The high pressure, the warm one over the azores and the cold one above
Canada/Grenland

In simple terms, help a dummy understand if the low pressure causes the storm,
or is the low pressure a byproduct of the storm?

Most often a byproduct if it's an extratopical storm, cold air
travelling south want to go to the east and warm air travelling north
want to go to the west, therefore a low pressure will build EAST of
the cold air going south and WEST of the warm air going north. (The
special geography and winds around Iceland often cause a stationary
low that traps extratropical lows)

_East&west corrected, the southwesterly mild air side of a low is to
the East, the cold polar to the west_

There was an example of low pressure first, tropical storm Karl going
extratropical on the gfs forecast 06, check it out.
http://www.eoascientific.com/campus/...ew_interactive
http://www.westwind.ch/?page=gfsm (slp h500; 10m winds; 850 hpa)

- The most nasty winds is often the northerly winds east of the low
and right before/after the cold front south and west of the low.

And why in the hell does the pressure rise and fall?

Often extratropical lows and the high pressure ridges between those.

Thanks,
Joe

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