"Jon O'Rourke" wrote in message
...
"Phil Layton" wrote in message
...
Oh Dear Jon - I spoke too soon!
EGLL 090750Z 35005KT 320V060 4300 BR FEW001 SCT002 BKN003 04/04
Q1021
BECMG
8000 FEW007 =
EGLL 090720Z 36006KT 310V040 1200 R09R/P1500 R09L/P1500 BCFG BR
FEW000
SCT001 BKN002 03/03 Q1020 BECMG 4000 SCT006 =

An hours worth of LVPs ! I'll look at the Logs later, but these fogs
that
arrive well after sunrise are a real ....

Phil

Hmm, I can imagine. Actually reminds me of an autumn morning while I
was at
Boscombe Down. I 'confidently' did the fast jet brief just after dawn
in
near CAVOK conditions, about an hour later thick fog, much to my
dismay :-P

.... these features are a real pain to forecast. The best I reckon we'll
ever be able to do is to outline the risk rather than explicitly
forecast post-dawn fog. As posted earlier, I could seen FG for a short
time in the direction of Easthampstead School / Park & Wildridings (for
those that know the area - not too far to the north), but here, in Gt.
Hollands/Tawfield, vis. no worse than 1000m at any time. And the fog
phase lasted less than 15 mins.

Some sort of micro-scale model linked to a network of local sensors
might give 30-45mins warning - expensive, and it will be a fine
judgement whether it is economically viable: Heathrow and similar
high-volume airports could probably justify though.

Martin.