Inversion at 2500 feet meant air was trapped going over Dartmoor, hence a very
windy day.
Lee wave activity too leading to strong lee gustiness in Exeter.

Max wind was at 1150 with a measured 10 minute mean speed at 3m agl of SW 18
knots gust 43 knots.
This converts to SW 31 knots gust 56 knots (64 mph) at 10m agl.
That fits in nicely with surrounding data and a force 7 at my house (sheltered
from SW) was consistent with other evidence. Full blown gale/severe gale on open
moor earlier in morning with several small trees and branches snapped off in the
part of Haytor adjacent to open exposed moorland.

This is my highest recorded gust at this station since I started wind
observations in Jan 2005.

Will.
--
-------------------------------------------------------------------------------
A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).

mailto:
www: http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm

DISCLAIMER - All views and opinions expressed by myself are personal
and do not necessarily represent those of my employer.
-------------------------------------------------------------------------------

Will

Winds have been gusting to 40-45 mph all day here in the Otter Valley
despite relative shelter to the west and SW. Mean wind speeds around 22-25
mph. Now gradually weakening.

As you say, I think the gusts were a bit stronger further west, in and
around Exeter.

Currently at 18:30, 9.0C, RH 70%, DP 3.8C, 1016.9 mb (R), Wind 13.5 mph
(mean 15 min) WNW, gusting 27 mph, Rain last 24 hrs 2.0 mm.
________________
Nick G
Otter Valley, Devon
83 m amsl
http://www.ottervalley.co.uk

"Will Hand" wrote in message
...
Inversion at 2500 feet meant air was trapped going over Dartmoor, hence a
very
windy day.
Lee wave activity too leading to strong lee gustiness in Exeter.

Max wind was at 1150 with a measured 10 minute mean speed at 3m agl of SW
18
knots gust 43 knots.
This converts to SW 31 knots gust 56 knots (64 mph) at 10m agl.
That fits in nicely with surrounding data and a force 7 at my house
(sheltered
from SW) was consistent with other evidence. Full blown gale/severe gale
on open
moor earlier in morning with several small trees and branches snapped off
in the
part of Haytor adjacent to open exposed moorland.

This is my highest recorded gust at this station since I started wind
observations in Jan 2005.

Something pretty nasty came through here around 8.30 this morning.
I can only assume it was some kind of a squall line. It had been
very windy beforehand but not exceptionally so. But as I was walking
to work I sensed that something was about to happen. Moments later
there was very heavy driving rain (trousers saturated!) and a fierce
wind, 60-70 mph perhaps looking at what it was doing to the trees.
Visibility was also severely reduced. It was at the point when
experiencing severe weather conditions starts becoming downright
unpleasant rather than exciting
All over in a few minutes and the front (occlusion?) cleared around
half an hour later.
--
Col

Bolton, Lancashire
160m asl

Teignmouth 24hrs to 18:00 GMT 11-Jan-07 (30 mtrs asl)

AM: Light Rain / Drizzle PM: Sunny Periods

Max +13.1c
Min +4.0c

Wind (Exeter) @ 18:00 GMT = W, 23 mph
Wind (Exeter) Highest Mean = W, 31mph @ 11:20 & 13:50
Wind (Exeter) Highest Gust = W, 55mph @ 13:50

Bar 00:00 GMT = 1020 mb
Bar 06:00 GMT = 1013 mb
Bar 12:00 GMT = 1011 mb
Bar 18:00 GMT = 1018 mb

Average Air Pressure - Past 28 Day Moving Average = 1023.3
Average Temp - Past 28 Day Moving Average = 7.9

Average Air Pressure - This Winter (Dec06-Feb07) = 1018.2
Average Temp - This Winter (Dec06-Feb07) = 8.5

Average Air Pressure - Annual = 1015.0mb
Average Temp - Annual = 12.1c
Official Long Term Average 1971-2000 = 11.0c

Today's METAR's @ Exeter Airport 24hrs to 18:00 GMT
http://weather.uwyo.edu/cgi-bin/wyow...M&STATION=EGTE

Synoptic Chart @ 00:00 GMT:
http://www.wetterzentrale.de/archive...ka20070111.gif

"Will Hand" wrote in message
...
Inversion at 2500 feet meant air was trapped going over Dartmoor, hence a
very
windy day.
Lee wave activity too leading to strong lee gustiness in Exeter.

Max wind was at 1150 with a measured 10 minute mean speed at 3m agl of SW
18
knots gust 43 knots.
This converts to SW 31 knots gust 56 knots (64 mph) at 10m agl.
That fits in nicely with surrounding data and a force 7 at my house
(sheltered
from SW) was consistent with other evidence. Full blown gale/severe gale
on open
moor earlier in morning with several small trees and branches snapped off
in the
part of Haytor adjacent to open exposed moorland.

This is my highest recorded gust at this station since I started wind
observations in Jan 2005.

Will.
--
-------------------------------------------------------------------------------
A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).

mailto:
www:
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm

DISCLAIMER - All views and opinions expressed by myself are personal
and do not necessarily represent those of my employer.
-------------------------------------------------------------------------------

Hi Will, I know you bin anything I write, but this is a serious question,
what causes gustiness, why don't the wind just blow, without all the stop
go.
Joe

"Joe" wrote in message
...
Hi Will, I know you bin anything I write, but this is a serious question,
what causes gustiness, why don't the wind just blow, without all the stop
go.
Joe



Never have time to reply to everyone Joe.

Gustiness is caused by many factors. Turbulence (transport of momentum in the
vertical), friction properties of varying land surfaces, precipitation loading,
changes in air density (e.g. gust front) to name a few. Generally the wind is
steadier over the sea (although heavy showers can produce violent gusts at sea)
and above what is called the boundary layer whose depth varies according to
temperature and moisture variation in the vertical but is often circa 900m in
depth in the UK.

HTH a bit.

Will.
--

"Will Hand" wrote in message
...

"Joe" wrote in message
...
Hi Will, I know you bin anything I write, but this is a serious question,
what causes gustiness, why don't the wind just blow, without all the
stop
go.
Joe



Never have time to reply to everyone Joe.
Thank you for the reply, seems a bit!! clearer now.
Joe