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Storm & Convective Discussion 12z 21/7/14 ------>


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Posted
  • Location: Llanwnnen, Lampeter, Ceredigion, 126m asl (exotic holidays in Rugby/ Coventry)
  • Location: Llanwnnen, Lampeter, Ceredigion, 126m asl (exotic holidays in Rugby/ Coventry)

    The gods of rain dont seem to like Dronfield

    Think that was an error playing it back

    Intense line developing just west of Nottingham 

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    Posted
  • Location: Haute Vienne, Limousin, France (404m ASL)
  • Weather Preferences: Warm and sunny with night time t-storms
  • Location: Haute Vienne, Limousin, France (404m ASL)

    Incredible here...I've seen a lot of storms, but these are awesome! Lights going on and off, no meal cooked yet!

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    Posted
  • Location: Derbyshire Peak District 290 mts. Wind speed 340 mts
  • Weather Preferences: Rain/snow, fog, gales and cold in every season
  • Location: Derbyshire Peak District 290 mts. Wind speed 340 mts

    63.3mm  :rofl:

     

    Incredible, Major flooding on the Wye & Derwent Valley's over the next 48hours.

    Oh how I weep with envy.  2.1 mm here at roughly the same time and I'm only 9 miles away.

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    Posted
  • Location: Sheffield
  • Weather Preferences: thunderstorms, heatwaves, extreme weather
  • Location: Sheffield

    The gods of rain dont seem to like Dronfield

     

    More torrential rain here now! this is amazing, Distant thunder also from the South, strikes being shown near Sutton in Ashfield also to the North near Sheffield

     

    What an evening this turned out to be!

     

    Lol, it was like that earlier when you were getting flooded. Since then we've had a fair bit of rain, but we'll still lag behind your impressive totals. A few more rumbles of thunder in the last half hour, including just now, as the band intensified to the east. Rain easing now, and that's our lot of what has been a very impressive day!

     

    Still plenty of storm action out there though, further north and down south towards Nottingham. Would get excited but it's all heading NE now, rather than NNW.

    Edited by SjV
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    Posted
  • Location: Chesterfield, Derbyshire, 110m
  • Location: Chesterfield, Derbyshire, 110m

    Frequent thunder again here, flashing off to the east from the developing line 

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    Posted
  • Location: Codicote, Hertfordshire
  • Location: Codicote, Hertfordshire

    Nothing as exciting happening down here.

    I'm hoping due to the fact the majority of the storms have missed us this year, that we're going to get dumped on in the snow stakes mid winter.

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    Posted
  • Location: Sheffield
  • Weather Preferences: thunderstorms, heatwaves, extreme weather
  • Location: Sheffield

    Frequent thunder again here, flashing off to the east from the developing line 

     Yep can hear it here, too. Been thundering all afternoon :D From random directions lol

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    Posted
  • Location: Chesterfield, Derbyshire, 110m
  • Location: Chesterfield, Derbyshire, 110m

     Yep can hear it here, too. Been thundering all afternoon :D From random directions lol

    Its loud and frequent here, really not much showing up on any of the detectors though so its source is a mystery! 

     

    Never mind, NW ATD just updated showing a fair few strikes around Stavely area.

     

    An organised line has now developed, wouldnt fancy driving up the M1 right now 

    post-17481-0-89020200-1407523186_thumb.j

    Edited by ChezWeather
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    Posted
  • Location: Sheffield
  • Weather Preferences: thunderstorms, heatwaves, extreme weather
  • Location: Sheffield

    Its loud and frequent here, really not much showing up on any of the detectors though so its source is a mystery! 

     

    Never mind, NW ATD just updated showing a fair few strikes around Stavely area.

     

    An organised line has now developed, wouldnt fancy driving up the M1 right now 

    Looks beautiful! Thunder if anything has got louder and more noticeable, but it's probably just me paying more attention to it, now I've had tea. 

     

    Not much else out to the west and southwest, unless anything can build behind this line.

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    Posted
  • Location: Blackwood SE Wales
  • Location: Blackwood SE Wales

    Flash Floods..http://www.bbc.co.uk/news/uk-england-beds-bucks-herts-28713677No telling what Sundays going to be like.. though I have my suspicions.Saturday 4th or 11th June 2009 ~ Low pressure develops over the UK ~ Now if I remember rightly, that was severe and had embedded thunderstorms with it to. 

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    Posted
  • Location: Norwich, Norfolk, East Anglia
  • Weather Preferences: Sunny, stormy and I don't dislike rain only cold
  • Location: Norwich, Norfolk, East Anglia

    So can we confirm supercells even briefly were present in the UK today?

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    Posted
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield
  • Weather Preferences: Any Extreme
  • Location: Sheffield South Yorkshire 160M Powering the Sheffield Shield

    One or two Thundery showers here so the shield was breached. Checking the radar they developed within the shield at first so it probably got overloaded and let others in later. 16.6mm of rain.

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    Posted
  • Location: just south of Doncaster, Sth Yorks
  • Location: just south of Doncaster, Sth Yorks

    thunder/lightning +v heavy rain, falling at 97.6mm p hr at 20118; c-g and c-g both e and west of me, still ongoing

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    Posted
  • Location: York
  • Location: York

    Almost constant thunder for about an hour when I was "sheltering" on the golf course just on the east of York. Retreated to the driving range and saw some odd lightning in the slate grey skies, like a camera going off but no fork. Next batch moving in, it's black as night and thunder getting louder

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    Posted
  • Location: cleethorpes
  • Location: cleethorpes

    this cambridge weather just clipping us but most will pass to the east.  Worry for east coast this massive one coming through further south this looks like might be bad for us east coasters.

     

    We have had 11 mm so far nothing like worst hit 

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    Posted
  • Location: Chesterfield, Derbyshire, 110m
  • Location: Chesterfield, Derbyshire, 110m

    Just back from a stroll up the road, watched the storm move away to the east and saw 6 or 7 decent bolts, shame it wasnt night time or id have been in for a real treat!

     

    All in all this has been a great evening, thundering pretty much non stop since about 3:30pm! 

    Edited by ChezWeather
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    Posted
  • Location: Chesterfield, Derbyshire, 110m
  • Location: Chesterfield, Derbyshire, 110m

    Some pretty bad quality lightning stills, the last one is from a CG, couldnt manage to get the bolt when pausing the video. 

    post-17481-0-00779300-1407528234_thumb.j

    post-17481-0-03743500-1407528240_thumb.j

    post-17481-0-19419400-1407528246_thumb.j

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    Posted
  • Location: Leeds
  • Weather Preferences: snow, heat, thunderstorms
  • Location: Leeds

    Posted Image

     

    Thunder and lightning for pretty much 6 hours. Crazy. Saw one last distant flash as I left Tesco recently.

    Edited by cheese
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    Posted
  • Location: Beverley, E Yorks, 19m ASL
  • Weather Preferences: Snow, Thunder - not necessarily at the same time!
  • Location: Beverley, E Yorks, 19m ASL

    Finally after threatening all day and rain on and off we have at last had some thunder! One flash 1.5 miles to the north at 21:43 but I will take it....

     

    Missed everything during the last fortnight strangely and we usually do pretty well here....

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    Posted
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)

    Some interesting convective potential showing on Sunday from GFS in association with the depression formed from ex-Bertha moving through. Strong jet aloft, veering wind profiles towards the surface with passage of low, 500mb dry air intrusion and several 100 j/kg CAPE in warm sector just ahead of cold front moving east = the recipe for severe thunderstorms. So potential for supercells bringing large hail, damaging convective gusts and even one or two tornadoes.

     

    Slp and jet + CAPE 12z Sun:

     

    post-1052-0-42499100-1407531832_thumb.pnpost-1052-0-06138100-1407531867_thumb.pn

     

    relative humidity at 500hPa at 12z Sun - blue showing dry air intrusion - which will enhance convection:

     

    post-1052-0-19678100-1407531930_thumb.pn

     

    Lightning wizard wind shear and sig. tornado parameter charts at 09z and 12z Sun show the potential for rotating storms and tornadoes:

     

    post-1052-0-81983200-1407531652_thumb.pnpost-1052-0-85872900-1407531670_thumb.pn

     

    However, I am only illustrating potential, rather than making an actual forecast, given uncertainty over the track of the low still. 12z ECM has the low tracking alot further south than GFS - through S England and exiting around the Wash, for example. Thus severe potential maybe confined to Sern England in this case.

    Edited by Nick F
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    Posted
  • Location: Belper, Derbyshire
  • Weather Preferences: Thunderstorms
  • Location: Belper, Derbyshire

    Well I ended up seeing a storm in the end as I chased that line of storms this evening from around Alfreton to Mansfield and beyond just before it started to die away. I didn't see a lot of lightning, but a few bright flashes evident as I was driving. The main thing about it was the rainfall and how dark it was. Considering it was only around 7:30pm it was like dusk and the rainfall was incredible. I can well believe the kind of rainfall amounts that have been reported as it was coming down in absolute torrents with visibility very poor on the A38 around Sutton, despite traffic only moving at around 30-40mph.

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