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Old April 25th 04, 10:01 AM posted to uk.sci.weather
Joe Hunt Joe Hunt is offline
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First recorded activity by Weather-Banter: Jan 2004
Posts: 392
Default Thunder Sunday ?


"Martin Rowley" wrote in message
...

"Paul Crabtree" (remove spam for valid
e-mail) wrote in message ...
Looking at the 7am radar - looks like heavy showers around The Wash

! -
cant confirm though

Paul

... if you put 7 or 8 degC on the midnight Watnall ascent, then that
implies an intense surface-based inversion. The radarnet will attempt to
remove such anomalies, but in these situations, there are limits ... it
is not always easy to detect though, and cross-referral to observations
on the ground (where available), SFERIC's and satellite pictures will
usually help
sort it out. The Wash 'hell and damnation' zone is a common feature in
these set-ups. (The clue here are the reports of mist/patchy fog/haze -
still, near-surface air after a
cool night).

See the radar FAQ for more on this ...

http://homepage.ntlworld.com/booty.w...o/radarFAQ.htm
(see paragraph B2)

However, note that the same ascent *does* imply instability later on,
with sufficiently high temperatures (or a dynamic trigger), so the
situation isn't straightforward by any means ;-)

Martin.


Hi Martin,

Living close to the area, well Leicestershire, the anaprop can get rather
annoying, but it is expected in such situations. I think we will need to
rely on surface convergence over E England today which should bring in
some more moisture at lower levels, as well as additional ascent. The TAFs
are giving less and less chance of something occurring, 00Z doesn't hold
out much hope. Off to play tennis and enjoy the day, showers or not !

ATB, Joe