Monday, 12 June 2006
BRACKNELL (TAWFIELD)
0900 SSE F3 30km - 1/AC 3/AC 5/CI T242D162
RMK: [CAVOK] - 1Ac cas (actually almost a 'trace')~100: this latter was
a much more definite element of the medium levels up to about an hour
ago, 3Ac (thinning/increasingly broken)~120 (the retreating western edge
of a multi-level sheet that dominated the sky earlier), 5Ci, thick
sheaves etc., ~250/280. Given the cloud character earlier and now, I
guess a well-marked upper trough/front has passed overhead (from the
west), and the marked descent to the rear has killed off the mid-level
activity. For a time around 06Z, we had 1Cu med~060 development, but
that rapidly fizzled.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 17.2 grass min: 14.7 precipitation: NIL [24hr total: 00.0
mm]
other data: Probably going to be the best part of the day - high
humidity, but not (yet) too warm. ]=

--
Bracknell (Wooden Hill/Tawfield), Berkshire, UK
NGR: SU 854 667 Elev: 80m
Lat: 51° 23' 30'' N: Long: 00° 46' 28'' W

Monday, 12 June 2006
BRACKNELL (TAWFIELD)
0900 SSE F3 30km - 1/AC 3/AC 5/CI T242D162
RMK: 1Ac cas (actually almost a 'trace')~100: this latter was a much
more definite element of the medium levels up to about an hour ago, 3Ac
(thinning/increasingly broken)~120 (the retreating western edge of a
multi-level sheet that dominated the sky earlier), 5Ci, thick sheaves
etc., ~250/280. Given the cloud character earlier and now, I guess a
well-marked upper trough/front has passed overhead (from the west), and
the marked descent to the rear has killed off the mid-level activity.
For a time around 06Z, we had 1Cu med~060 development, but that rapidly
fizzled.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 17.2 grass min: 14.7 precipitation: NIL [24hr total: 00.0
mm]
other data: Probably going to be the best part of the day - high
humidity, but not (yet) too warm. ]=

1200 SSE F3 30km - 1/AC 6/CI T297D173
RMK: [CAVOK & COTRA] - tr Ac~180 (showing slight tendency to
'turrets'), 2Cc~250, within, or separate from (can't be too sure) 6Ci
(multi-level + COTRA)~250/300. Warmest day of the year so far (easily
beating previous highs), and with strong sunshine, should creep up a bit
more.=

--
Bracknell (Wooden Hill/Tawfield), Berkshire, UK
NGR: SU 854 667 Elev: 80m
Lat: 51° 23' 30'' N: Long: 00° 46' 28'' W

Monday, 12 June 2006
BRACKNELL (TAWFIELD)
0900 SSE F3 30km - 1/AC 3/AC 5/CI T242D162
RMK: 1Ac cas (actually almost a 'trace')~100: this latter was a much
more definite element of the medium levels up to about an hour ago, 3Ac
(thinning/increasingly broken)~120 (the retreating western edge of a
multi-level sheet that dominated the sky earlier), 5Ci, thick sheaves
etc., ~250/280. Given the cloud character earlier and now, I guess a
well-marked upper trough/front has passed overhead (from the west), and
the marked descent to the rear has killed off the mid-level activity.
For a time around 06Z, we had 1Cu med~060 development, but that rapidly
fizzled.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 17.2 grass min: 14.7 precipitation: NIL [24hr total: 00.0
mm]
other data: Probably going to be the best part of the day - high
humidity, but not (yet) too warm. ]=

1200 SSE F3 30km - 1/AC 6/CI T297D173
RMK: [CAVOK & COTRA] - tr Ac~180 (showing slight tendency to
'turrets'), 2Cc~250, within, or separate from (can't be too sure) 6Ci
(multi-level + COTRA)~250/300. Warmest day of the year so far (easily
beating previous highs), and with strong sunshine, should creep up a bit
more.=

1500 S F3 50km - 1/CU 3/CI T313D154
RMK: [CAVOK & COTRA] - -tr Cu hum (just started developing)~060, 1Ci
(dense/possible edge of sheet to west)~250, 3Ci (fibrous but with hooked
appearance/unc)~280. Provisional maximum for the day 31.6°C, the warmest
day since the 19th June last year.=

--
Bracknell (Wooden Hill/Tawfield), Berkshire, UK
NGR: SU 854 667 Elev: 80m
Lat: 51° 23' 30'' N: Long: 00° 46' 28'' W

Monday, 12 June 2006
BRACKNELL (TAWFIELD)
0900 SSE F3 30km - 1/AC 3/AC 5/CI T242D162
RMK: 1Ac cas (actually almost a 'trace')~100: this latter was a much
more definite element of the medium levels up to about an hour ago, 3Ac
(thinning/increasingly broken)~120 (the retreating western edge of a
multi-level sheet that dominated the sky earlier), 5Ci, thick sheaves
etc., ~250/280. Given the cloud character earlier and now, I guess a
well-marked upper trough/front has passed overhead (from the west), and
the marked descent to the rear has killed off the mid-level activity.
For a time around 06Z, we had 1Cu med~060 development, but that rapidly
fizzled.
[ OVERNIGHT DATA (18Z - 09Z):
screen min: 17.2 grass min: 14.7 precipitation: NIL [24hr total: 00.0
mm]
other data: Probably going to be the best part of the day - high
humidity, but not (yet) too warm. ]=

1200 SSE F3 30km - 1/AC 6/CI T297D173
RMK: [CAVOK & COTRA] - tr Ac~180 (showing slight tendency to
'turrets'), 2Cc~250, within, or separate from (can't be too sure) 6Ci
(multi-level + COTRA)~250/300. Warmest day of the year so far (easily
beating previous highs), and with strong sunshine, should creep up a bit
more.=

1500 S F3 50km - 1/CU 3/CI T313D154
RMK: [CAVOK & COTRA] - tr Cu hum (just started developing)~060, 1Ci
(dense/possible edge of sheet to west)~250, 3Ci (fibrous but with hooked
appearance/unc)~280. Provisional maximum for the day 31.6°C, the warmest
day since the 19th June last year.=

1800 SSW F2 45km - 1/AC 7/CI T262D160
RMK: [CAVOK & COTRA] - tr Ac cas 080, 1Ac~120, 1Ac180, 1Cc~220,
7Ci/COTRA~280. This latter a simplification, as there are undoubtedly at
least two layers of Cirrus, varying from simple fibrous streaks, to
dense tufts, to the orphaned anvil contributing at least 50% of the
total. A typical sample of a sky where development is * weakening *,
i.e. the upper trough/front is breaking up. There is a high westerly
component to the cloud motion, suggesting to me that the upper dynamics
are losing potency.
[ DAYTIME DATA (09Z - 18Z):
screen max: 31.5 precipitation: NIL
other data: Note slight correction to final maximum. ]=

--
Bracknell (Wooden Hill/Tawfield), Berkshire, UK
NGR: SU 854 667 Elev: 80m
Lat: 51° 23' 30'' N: Long: 00° 46' 28'' W