Sunday, 07 August 2005
BRACKNELL (TF)
0900 NNW F3 40km - 1/CU T156D086
RMK: 1 okta Cu hum/fra - evaporating as quickly as it forms in the dry
air. Also present some delicate Cirrocumulus to the north. A fine,
reasonably deep blue sky.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 08.6 grass min: 06.9 precipitation: NIL
other data: coldest 'first-half' August night since 2001 ]=

--
Martin Rowley: data via -
http://homepage.ntlworld.com/booty.weather/metindex.htm
Bracknell (Wooden Hill/Tawfield), Berkshire
NGR: SU 854 667 Elev: 80m
Lat: 51DEG23MIN30SEC(N): Long: 00DEG46MIN28SEC(W)

Sunday, 07 August 2005
BRACKNELL (TF)
0900 NNW F3 40km - 1/CU T156D086
RMK: 1 okta Cu hum/fra - evaporating as quickly as it forms in the dry
air. Also present some delicate Cirrocumulus to the north. A fine,
reasonably deep blue sky.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 08.6 grass min: 06.9 precipitation: NIL
other data: coldest 'first-half' August night since 2001 ]=

1800 N F3 50km - 1/CU T210D048
RMK: Cu hum, with 2 oktas Sc Cugen - a fine evening, with the chink of
knife, fork and plate all around.
[ DAYTIME DATA (09Z - 18Z):
screen max: 21.6 precipitation: NIL
other data: With a day max of 22 (rounded), an air-mass dew point of
around 5, not much cloud and a failing wind, it is going to be
interesting to see what the air (and grass) min is going to be; we'll
probably keep a very gentle northerly through the night, so using
McKenzie, (22+5)/2 = 13 [rounded] with 5 kn and 2 oktas cloud gives a
K value of 5 or 6, so theoretical min around 7 or 8. The strong solar
heating of the ground etc., though will play a part in offsetting the
fall of temperature. ]=

--
Martin Rowley: data via -
http://homepage.ntlworld.com/booty.weather/metindex.htm
Bracknell (Wooden Hill/Tawfield), Berkshire
NGR: SU 854 667 Elev: 80m
Lat: 51DEG23MIN30SEC(N): Long: 00DEG46MIN28SEC(W)

"Martin Rowley" m wrote
in message ...
Sunday, 07 August 2005
BRACKNELL (TF)
other data: With a day max of 22 (rounded), an air-mass dew point of
around 5, not much cloud and a failing wind, it is going to be
interesting to see what the air (and grass) min is going to be; we'll
probably keep a very gentle northerly through the night, so using
McKenzie, (22+5)/2 = 13 [rounded] with 5 kn and 2 oktas cloud gives
a K value of 5 or 6, so theoretical min around 7 or 8. The strong
solar heating of the ground etc., though will play a part in
offsetting the fall of temperature. ]=

.... 8.6 in the end (air min); not too bad considering I was using the
'general' K values rather than specific ones for this site.

Martin.

In message , Martin Rowley
writes

"Martin Rowley" m wrote
in message ...
Sunday, 07 August 2005
BRACKNELL (TF)
other data: With a day max of 22 (rounded), an air-mass dew point of
around 5, not much cloud and a failing wind, it is going to be
interesting to see what the air (and grass) min is going to be; we'll
probably keep a very gentle northerly through the night, so using
McKenzie, (22+5)/2 = 13 [rounded] with 5 kn and 2 oktas cloud gives
a K value of 5 or 6, so theoretical min around 7 or 8. The strong
solar heating of the ground etc., though will play a part in
offsetting the fall of temperature. ]=

... 8.6 in the end (air min); not too bad considering I was using the
'general' K values rather than specific ones for this site.

Martin.

For Chalfont St Giles using "general" K values I would have arrived at a
predicted min of 6. The actual min turned out to be 7.0 so a very
similar performance to what you had, Martin. Not at all bad.

Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England