In message , Philip Eden
writes

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

"Philip Eden" philipATweatherHYPHENukDOTcom wrote :

"Philip Eden" philipATweatherHYPHENukDOTcom wrote :
0850z NE F3 5km HZ 1Ac080 19.5/15.5 1016.3
RMK: 8St and BR until just after 08z ... a welcome and
decidedly cool wind blowing through the bedroom window
when I got up this morning. Now a Tr of Ac fl, a Tr of
Ac cas, and 1 okta of Ci.

1150z NE F3 15km 1Ac080 5Ci300 25.8/16.8 1015.4
RMK: A little Cu developed around 1030-1100z but it
has gone again; now a few scraps of Ac fl, much more Ci again.
Temperature 3degC lower than this time on Monday, but
dew-point higher.
1450z SSE F4-5 12km -TS 5Cb050 6Ac090 27.5/17.5 1014.0
RMK: Big bruise-coloured cloud coming up fast from the SE;
distant flashes and low rumbles for last 10 minutes
1520z NE F6 1000m +TSRA 8Cb040 17.9/17.0
RMK: Much electrical activity, very heavy rain (large drops);
report of marble-sized hail from Luton
1550z NNE F3 20km TSRA 3Cb040 7Ac080 17.9/17.5
RMK: Cells which travelled either side of us now moving
away northwestwards. Practically stopped raining. During
the last 15 mins there were c-g strikes about one per minute
within 2km to the NE of here (Kensworth and southern
outskirts of Dunstable) from the back edge of the easternmost
of those two cells. Several short power failures. Much
lying water in the garden, but no hail here.

Philip Eden (off to measure the rainfall now; back in a mo ...)

And then the power went off for several hours, followed by a
visit to Luton. Rainfall at Whipsnade 22.9mm between 1500z and
1615z, of which about 20mm fell in 35 minutes comprising three
'surges', presumably from different cells.

At Luton 26.5mm fell entirely within 20min from 1505 to 1525z,
including a dramatic hailstorm with stones 1.0-1.2cm diameter,
heaps of which still remained when I left around 21z. Trees, shrubs,
etc, were partly stripped of leaves, flowers and young fruit, and
the card in my sunshine recorder there was partly shredded.
There was also extensive wind-damage - large branches broken,
one small tree decapitated ... people described it as "like being
in a hurricane".

Philip

The storm developed as it passed overhead in Chalfont St Giles. The
first rumbles of thunder were heard close to the north at about 1500z
but it all moved away quickly north as it grew. No rain at all here.

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