Adrian D. Shaw wrote:
Felly sgrifennodd :
somewhere
in Scotland this week.

I'm amazed at that report. On Sunday here (central southern England)
it
was sunny, but decidedly cold, no more than 15c I would say.

As I posted in a thread replying to Colin Youngs, I recorded 22.5 on
Sunday
(disagreeing markedly with the figure of Trawsgoed not so far away).
My
wife was running in the "Race for Life" in Aberystwyth that day and
suffered
quite badly from the head (despite, I'm sure she'd like me to add,
coming
44th out of 1,200 and beating her keep fit instructor). It certainly
_felt_
well in the 20's, and I'm pretty good at estimating temperature.

Me too, but I was wrong on Sunday. I felt comfortably warm outside in a
T shirt, but the max was only 16. The cold nagging wind of the previous
week had gone which perhaps made me overestimate.


It was
deckchairs out on the patio and t-shirt weather when we got back home
around
13:00 (now I wouldn't have done _that_ in 17C).

I did on Sunday, and I wasn't the only one round here who did. The beer
gardens etc were packed with T-shirts.



My thermometer is part of a LaCrosse WS-3600 weather station and is
well
screened with the standard plastic disc-shaped thingys, so I can't
believe
direct sunshine had a significant effect. I wonder if, being on a
mountainside, there was some Foehn effect.

Probably, and I suspect those 21s in Wales in March were the same. As I
pointed out earlier, I'm a bit puzzled why we never seem to get these
effects here, with lots of high ground to the S and W. Wouldn't have
expected it on Sunday though, as it was an easterly.

Wind was predominantly NNE (from
the Pumlumon massif) at the time, suddenly switching to W at 13:55.
At
exactly this time the temperature started to plummet (22.5@13:50),
going
down 8 degrees (14.5@14:40) in 50 minutes.

Adrian (12 miles ESE Aberystwyth, 260m/860ft asl)

--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk

Edmund