"Len Wood" wrote in message
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On Jan 4, 5:06 pm, "Eskimo Will" wrote:
"Len Wood" wrote in message

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On Jan 3, 6:01 pm, "Eskimo Will" wrote:

Totals 1800 2/1/12 to 1800 3/1/12

Haytor 39.0 mm
Postbridge 82.4 mm

A bit windy as well with a few trees down in the neighbourhood.
My large wooden garden seat also blew over.
Otherwise, no issues.

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
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That 83 mm figure for Postbridge (369m) on Dartmoor does seem
amazingly high.
Probably very localised within the line convection that went through.
Missed you Will.
Only 12.6 mm here to 1800 GMT.

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No Len it was totting up before the line convection, it is orographic
enhancement. I should think Cut Hill (circa 2000 feet asl) would have
collected over 100 mm. The high moor really is saturated now.
Also, line convection alone would not have lasted long enough to explain
the
difference, moreover we got the line convection at Haytor with 50 mm/h
rates
as the front came through.

Cheers,

Will
Haytor, Dartmoor (rain capital of the SW)
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I can't believe the difference in altitude of 50 m between you in
Haytor and Postbridge can lead to such a large difference in rainfall
of 43 mm.
That is a hell of an enhancement for just 50 m.
There may have been more of a seeder-feeder mechanism going on in
Postbridge than Haytor I guess.
It was a SouWesterly gale so this does maximise the orographic enhance
I grant you.

But you also have your head in the clouds surely?
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No not that day. Surface wind up here was WSW, geostrophic wind was more
veered and in that direction I get a lot of shelter from the Hameldown
Ridge, Hay Tor itself and to an extent, Rippon Tor all over 450m asl.
Due SW or SSW would have been different.
It does depend on wind as well if the wind is lighter then clouds do descend
in a WSW'ly but the turbulent mixing of stronger winds keeps the clouds
aloft, but also increases the orographic enhancement upwind. The main fog
direction for my house is SE to SW humid fetch.
Postbridge is one hell of a wet place Len it has to be said, it is more
snowy too usually.

Cheers,

Will
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