Thunderstorm

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Thunderstorm

Postby greg_gruner » 2014 Jan 03, 20:39

Thunder was heard in Farnborough today, a very loud rumble at 1230. The temperature dropped from 9.8C at 1230 to 6.3C at 1300.
I see from pictures on the BBC website that other places in the SE had hail as well.
Greg Gruner
Farnborough, Hampshire
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Re: Thunderstorm

Postby Martin Rowley » 2014 Jan 04, 10:24

... we had 'thunder heard', typical winter-time "single-flash, 5second-rumble, gone" affairs 03/1146Z and 03/1247Z, the second one was followed by a brief period of small hail mixed in with the rain (moderate-heavy intensity) & there were further hail/rain mixed showers during the evening.

Elsewhere in the SW, I've seen images of hailstones of the size of a pound coin (several) from Somerset - now whilst ours were individual cells coupled to short-waves moving up from the SW, these were associated with a markedly linear development (possibly along-flow convergence) - first seen over Cornwall early in the day which seemed to propagate along the flow - either one or two 'supercell' like efforts running towards the ENE, or, more likely in my view, multi-cell CBs which due to the lack of directional shear along-flow threw out daughter cells.

However, the really interesting thing about all this was what happened over the Low Countries and NW Germany/Rhineland - an 'explosion' of CB activity that I could only liken to a summer-time MCS growth which plastered the sferics display for hundreds of miles. Truly amazing.

Martin.
Martin Rowley
West Moors, East Dorset [ altitude: 17 m/56' ]
NGR SU 082 023: postcode BH22 0GB
50deg49min15secN, 01deg53min03secW
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Re: Thunderstorm

Postby Graham Easterling » 2014 Jan 04, 14:10

Elsewhere in the SW, I've seen images of hailstones of the size of a pound coin (several) from Somerset - now whilst ours were individual cells coupled to short-waves moving up from the SW, these were associated with a markedly linear development (possibly along-flow convergence) - first seen over Cornwall early in the day which seemed to propagate along the flow - either one or two 'supercell' like efforts running towards the ENE, or, more likely in my view, multi-cell CBs which due to the lack of directional shear along-flow threw out daughter cells.


We had 4 separate thunderstorms in Penzance yesterday (early hours, around 07:45, another cell in the same 'cluster' 08:30, another in the afternoon) together with hail, large at times, enough to cover the ground on 2 occasions. All storms quite brief, but some very close flashes.

Heavy hail @ 11:00 today left the ground covered. Fairly sunny currently. Big sea late yesterday http://www.sennen-cove.com/3jan14.htm , but something potentially significantly bigger on Monday. http://magicseaweed.com/news/Atlantic-C ... ming/5954/ . Big wave surfers will be down on the north coast where the wind should be offshore. 28' forecast for Sennen, some reef breaks (Fistral & Porhleven) could be huge.
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
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