Tuesday 23rd August 2011


Meteosat MSG satellite picture from Ferdinand Valk's site at 12.00 UTC
http://www.fvalk.com/images/Day_image/MSG-1200-EUR.jpg

Meteosat MSG-2 satellite picture from Bernard Burton's site at 12.00 UTC
http://www.woksat.info/etcth23m/th23-msg-1200-uk.html

NOAA 19 satellite picture from Bernard Burton's site at 12.52 UTC
http://www.woksat.info/etcth23/th23-1252-b-uk.html


UK min. temps on Monday night http://tinyurl.com/3ho629d

Loch Glascarnoch and Drumalbin 6.8°C, Tiree 6.5°C, Eskdalemuir 6.4°C,
Altnaharra and Lusa (Skye) 6.3°C, Lough Fea 6.1°C, Kirkwall and Stornoway
5.9°C, West Freugh and Redesdale 5.1°C.

Manston 15.5°C, Mumbles and Heathrow 15.6°C, Jersey Airport 16.4°C, St
Helier (Jersey) 16.7°C.


UK max. temps on Tuesday http://tinyurl.com/42bv3cj

Glen Ogle 10.1°C, Fair Isle 14.2°C, High Wycombe 14.4°C, Fylingdales
14.5°C, Larkhill and Odiham 14.6°C.

Rhyl 20.5°C, Nottingham (Watnall) 20.7°C, Crosby 20.8°C, Shawbury 21.0°C,
Pershore 21.1°C, Coleshill 21.2°C, Shobdon 21.4°C, Hereford (Credenhill)
21.5°C, Hawarden 21.6°C, Trawsgoed 22.0°C.

OGIMET summary http://tinyurl.com/3c2pqo7


Rainfall radar http://www.meteox.com/h.aspx?r=&soort=loop24uur&URL or
http://www.raintoday.co.uk/

Rainfall totals in 24 hours ending 18.00 UTC on Tuesday
http://tinyurl.com/3rv5x9o

Brize Norton, Larkhill, Heathrow and St Catherine's Point 5 mm, Middle
Wallop 6 mm, Boscombe Down 7 mm, Manston and Guernsey 9 mm, Bournemouth
(Hurn) and Shoeburyness 10 mm, Charlwood 13 mm, Kenley 15 mm.


Location of some UK stations
http://www.metoffice.gov.uk/educatio...r_data_uk.html


Colin Youngs
Brussels

In article ,
Colin Youngs writes:
UK max. temps on Tuesday http://tinyurl.com/42bv3cj

Glen Ogle 10.1°C, Fair Isle 14.2°C, High Wycombe 14.4°C, Fylingdales
14.5°C, Larkhill and Odiham 14.6°C.

It must be very rare in summer for High Wycombe's maximum to be on a par
with Fair Isle's.
--
John Hall
"Men occasionally stumble over the truth, but most of them pick
themselves up and hurry off as if nothing ever happened."
Winston S Churchill (1874-1965)

On 23/08/11 21:33, John Hall wrote:
In ,
Colin writes:
UK max. temps on Tuesday http://tinyurl.com/42bv3cj

Glen Ogle 10.1°C, Fair Isle 14.2°C, High Wycombe 14.4°C, Fylingdales
14.5°C, Larkhill and Odiham 14.6°C.

It must be very rare in summer for High Wycombe's maximum to be on a par
with Fair Isle's.

It may have happened last Thursday which was a nastier day than today.

On Aug 23, 11:45*pm, Adam Lea wrote:
On 23/08/11 21:33, John Hall wrote:

In ,
* Colin *writes:
UK max. temps on Tuesday *http://tinyurl.com/42bv3cj

Glen Ogle 10.1°C, *Fair Isle 14.2°C, *High Wycombe 14.4°C, *Fylingdales
14.5°C, *Larkhill and Odiham 14.6°C.

It must be very rare in summer for High Wycombe's maximum to be on a par
with Fair Isle's.

It may have happened last Thursday which was a nastier day than today.

Incidentally why the extremely low temperatures? (I think below 15C in
August, being equivalent to sub-zero in January, can warrant that
label) Typical temperatures for a wet August day IMX are in the range
17-19C (for southern England), and the temperatures observed in
Hereford, etc, suggest this wasn't a particularly cool airmass.

Nick

On 24/08/11 08:24, Nick wrote:
On Aug 23, 11:45 pm, Adam wrote:
On 23/08/11 21:33, John Hall wrote:

In ,
Colin writes:
UK max. temps on Tuesday http://tinyurl.com/42bv3cj

Glen Ogle 10.1°C, Fair Isle 14.2°C, High Wycombe 14.4°C, Fylingdales
14.5°C, Larkhill and Odiham 14.6°C.

It must be very rare in summer for High Wycombe's maximum to be on a par
with Fair Isle's.

It may have happened last Thursday which was a nastier day than today.

Incidentally why the extremely low temperatures? (I think below 15C in
August, being equivalent to sub-zero in January, can warrant that
label) Typical temperatures for a wet August day IMX are in the range
17-19C (for southern England), and the temperatures observed in
Hereford, etc, suggest this wasn't a particularly cool airmass.

Nick

My guess is that the cloud is very thick and there is a relatively
stagnant airmass over the UK so very little sunlight is available to
warm the surface, and little surface advection, hence temperatures
hardly rise from their overnight values BICBW. If you look at the Met
Office graphical observations for London you will see the temperature
has been flat for the last 24 hours. Must be pretty unusual at this time
of year.

On Aug 24, 8:24*am, Nick wrote:
..

Incidentally why the extremely low temperatures? (I think below 15C in
August, being equivalent to sub-zero in January, can warrant that
label) Typical temperatures for a wet August day IMX are in the range
17-19C (for southern England), and the temperatures observed in
Hereford, etc, suggest this wasn't a particularly cool airmass.

Nick

Tha max here was 15.1°C which places it in the bottom 1.5%
of all August maxes since 1983. The equivalent max for January is
-2.7°C. The standard deviations of maxes in both months is similar
but they show opposite skewness so that the 15.1° is 6.0 degC below
the August median whereas the -2.7° is 9.4 degC below that for
January.
It did not feel all that cold, despite continuous slight
drizzle. There was no wind to speak of and the humidity was high.

Tudor Hughes, Warlingham, NE Surrey, 556 ft, 169 m.

On Wed, 24 Aug 2011 00:24:27 -0700 (PDT), Nick
wrote:
On Aug 23, 11:45*pm, Adam Lea wrote:
On 23/08/11 21:33, John Hall wrote:
Incidentally why the extremely low temperatures? (I think below 15C
in




17-19C (for southern England), and the temperatures observed in
Hereford, etc, suggest this wasn't a particularly cool airmass.

The initial dryness of the low-level air probably had something to do
with it (increased evaporative cooling), as did the timing (no
daytime heating before onset of precipitation). Thickness of the
cloud layer definitely contributed (as discussed in another reply).

--
Freddie
Bayston Hill
Shropshire
102m AMSL
http://www.hosiene.co.uk/weather/cumulus/