In message , Martin Rowley
writes
Saturday, 09 April 2005
BRACKNELL (TF)
0615 W F1-2 45km - 1/AC T-011D-040
RMK: Ac is a mix of isolated patch of lenticular-looking type and Ac
floccus; also 1 oktas high-base Cirrus present: a glorious (if chilly)
morn. Hoar frost almost nil - air too dry.
Grass min currently -1.8; has been down below -3.=
0800 WNW F3 50km - 1/CI COTRA T033D-005
RMK: trace of Cirrus/ex-COTRA, otherwise clear blue sky. Feels quite
warm in sun/out of wind, but latter has picked up now and feels cold in
shade particularly.=

0900 WNW F4 50km - 1/CU T052D007
RMK: Feeling quite cold now, despite the strong rise in temperature; a
trace of Cumulus (Cu fra/hum) and all other cloud now disappeared. (Am a
bit suspicious about my dew point rise - but I assume that the increased
wind has mixed the air vertically quite strongly.)

The dew point in Chalfont St Giles behaved much the same as yours,
Martin. At 0545z it was -6.0 but by 0900z it had risen to +0.9

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