In message , Norman Lynagh
writes
There's a significant difference between the current TAFs for Heathrow
and Northolt despite them being only about 6 miles apart:

EGLL 210603Z 210716 03010KT 9999 SCT030
PROB30 0708 8000 BKN009
PROB30
TEMPO 0816 9000 -RA

EGWU 210758Z 210903 03012KT CAVOK
TEMPO 0924 7000 RA
PROB30
TEMPO 1124 4000 +TSRA BKN050CB

The Radio 4 forecast said that the rain "will be patchy and mostly
light", which is consistent with the Heathrow TAF. Current radar
imagery lends some support for the Northolt TAF.
Norman, I really cannot see why there is a difference - presumably both
Heathrow and Northolt are prepared at Bracknell. The difference is very
small with both being eminently flyable.
I don't know how dependant they are on the latest computer run - it
looks like very.
But the conflict is minimal and would not have thought it would
interfere with any aircraft movements in any way.
Cheers
Paul
--
'Wisest are they that know they do not know.' Socrates.
Paul Bartlett FRMetS
www.rutnet.co.uk Go to local weather.
400FT AMSL 25Miles southwest of the Wash