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Convective / Storm Discussion Thread - 27th Feb onwards


Nick F

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Posted
  • Location: Barton on Sea, Hampshire
  • Weather Preferences: Snowy winter, warm/hot summer with the odd storm thrown in
  • Location: Barton on Sea, Hampshire

Was quite dark near here not long ago. Guess it was only light rain though looking at the radar. 

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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)

Storm & Convective Forecast

convmap_250417.thumb.png.5274a9bd5fd8b91e994e9fbaa4b8b65a.png

Issued 2017-04-24 21:24:12

Valid: 25/04/2017 00z to 26/04/2017 00z

CONVECTIVE / STORM FORECAST - TUESDAY 24TH APRIL 2017

Synopsis

Upper trough will dig south across the UK on Tuesday, at the surface - an area of high pressure will be situated to the W of the UK over the N Atlantic while a low pressure system will be slow-moving across Scandinavia. A cold and showery northerly flow will cover the UK with sufficient diurnal instability to support thunder and hail.

... E IRELAND, WALES, ENGLAND, S and E SCOTLAND ...

Upper trough pushing south, containing unseasonably cold mid-level temperatures (500mb temps below -35C), will create steep lapse rates with surface heating in the strong late April sunshine, yeilding a few 100 j/kg CAPE across much of the UK. As a result, heavy showers will readily develop inland after a dry/clear start, scattered weak thunderstorms are likely too. Any showers/storms will be accompanied by hail and gusty winds, with a wintry mix of sleet or snow too - given low dew points/temps. No severe weather is expected.

Issued by: Nick Finnis

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Posted
  • Location: Cleeve, North Somerset
  • Weather Preferences: Continental winters & summers.
  • Location: Cleeve, North Somerset

Heard thunder from this cell out over the Severn Estuary not too long ago.

image.jpeg

image.jpeg

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Posted
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
  • Weather Preferences: severe storms,snow wind and ice
  • Location: Hoyland,barnsley,south yorkshire(134m asl)

A storm popping off NE of Nottingham now,i did take a pic of this in it's early stages,will upload it later.

Edited by Allseasons-si
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Posted
  • Location: Pemberton, Wigan, 54 M ASL. 53.53,-2.67
  • Weather Preferences: Winter - snow, Irish sea convection. Summer - thunderstorms, hot sunny days
  • Location: Pemberton, Wigan, 54 M ASL. 53.53,-2.67

 A dry and sunny day after the diurnal minimum as I expected, though with a cold wind. Sferics popping off inland but not a bad day here. 

Max 10.2C min 1.7C

Edited by Chris.R
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Posted
  • Location: London
  • Weather Preferences: Lighting and sunshine
  • Location: London
2 minutes ago, Weather-history said:

First thunder of 2017. Hail and 4 rumbles of thunder

Same.  I'm out of the no storms club of 2017. Some rainy hail attached, plus a small video of some sunlit precipitation blowing past coming soon

VID_20170425_162526.mp4

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Posted
  • Location: Pemberton, Wigan, 54 M ASL. 53.53,-2.67
  • Weather Preferences: Winter - snow, Irish sea convection. Summer - thunderstorms, hot sunny days
  • Location: Pemberton, Wigan, 54 M ASL. 53.53,-2.67

 I had a rumble last night and one on 28 February so I'm doing well so far. 

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Posted
  • Location: London
  • Weather Preferences: Lighting and sunshine
  • Location: London
35 minutes ago, Chris Lea-Alex said:

Same.  I'm out of the no storms club of 2017. Some rainy hail attached, plus a small video of some sunlit precipitation blowing past coming soon

VID_20170425_162526.mp4

 

MOV_0192.mp4

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Posted
  • Location: Ouse Valley, N. Bedfordshire. 48m asl.
  • Location: Ouse Valley, N. Bedfordshire. 48m asl.

Just had thunder.

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Posted
  • Location: NW Bexley, Kent
  • Weather Preferences: Storms, rain, tornados, funnel clouds and the northern lights
  • Location: NW Bexley, Kent

I had a small cell to my northeast and another to my southwest an hour ago. They've since moved on. No action here, sunny and warm in the sun combined with that cold wind. Strange day. The radar shows hundreds of tiny little cells over much of the country - a some have produced sparks. Very hit and miss. Still in the no storms club for about a year or just under now.

Edited by Windblade
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Posted
  • Location: NW Bexley, Kent
  • Weather Preferences: Storms, rain, tornados, funnel clouds and the northern lights
  • Location: NW Bexley, Kent
4 hours ago, MP-R said:

Heard thunder from this cell out over the Severn Estuary not too long ago.

image.jpeg

image.jpeg

Lovely looking cell you got there.

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Posted
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
  • Weather Preferences: severe storms,snow wind and ice
  • Location: Hoyland,barnsley,south yorkshire(134m asl)

Today has been a photogenic day with plenty of April showers with everything but the kitchen sink thrown in,but no T&L:nonono:,still cannot grumble as the photos where spectacular today:D

as i mentioned earlier up the page about the NE Nottingham storm,here is the pic of it's early stage just from a small cumulus to this in 20 mins

DSC01239.thumb.JPG.0ce24b013241ab5cbd478d35796311e2.JPG

these two five mins apart then ten mins later

DSC01254.thumb.JPG.be6d3be6a832b63772799b8322a785a3.JPGDSC01257.thumb.JPG.0c0455f0cdca3ea3e3751b3520bea4fd.JPGDSC01258.thumb.JPG.105697b73019514f9cb7335324d41cb0.JPG

loved tracking this one,with a lovely hail/graupel shaft

DSC01264.thumb.JPG.8aea13f03937a43fa5aa02b00fe434e4.JPGDSC01264.thumb.JPG.8aea13f03937a43fa5aa02b00fe434e4.JPGDSC01265.thumb.JPG.f365ff376124dd014ee3e5cf6b686685.JPGDSC01268.thumb.JPG.f0bc5ffd74c970bf6e7c3d778d8afa96.JPG

some other nice cloudscapes,like the second one

DSC01249.thumb.JPG.e024f569637b9690537c85958ae37a65.JPGDSC01252.thumb.JPG.5b452f95274b9ab0295696ffa84fd3ee.JPG

and a little cloud on the prairy pan:D

DSC01236.thumb.JPG.aa26f611ba034810bb0ba066f7bc2208.JPG

i didn't realise i cought a maggie on this one.

DSC01263.JPG

vid upload done,let it settle in 17 secs:)

 

Edited by Allseasons-si
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Posted
  • Location: NW Bexley, Kent
  • Weather Preferences: Storms, rain, tornados, funnel clouds and the northern lights
  • Location: NW Bexley, Kent

Small cell I spotted about 6pm to my northwest yesterday evening...

 

 

IMG_20170425_171841.jpg

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Posted
  • Location: NW Bexley, Kent
  • Weather Preferences: Storms, rain, tornados, funnel clouds and the northern lights
  • Location: NW Bexley, Kent

And this morning, taken just now, nice towers starting to go up in Tower Hamlets...

 

 

IMG_20170426_095754.jpg

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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)

Hopefully another day of interesting convective skies today across England - especially towards the SE - where there will be greatest instability beneath departing upper trough

t500_w15z.thumb.png.9b3b00864ce1433fe279731983c962bc.pngGFSOPUK00_15_11.thumb.png.162528f302c71be6227c7d8d7e8fe9af.png

Here's my storm forecast for today:

Storm & Convective Forecast

convmap_260417.thumb.png.3fea0a71ad89fbd33d4f57f4e88624a0.png

Issued 2017-04-26 09:23:12

Valid: 26/04/2017 06z to 27/04/2017 06z

STORM FORECAST - WEDS 26TH APRIL 2017

Synopsis

Upper trough will continue to push SE into mainland northern Europe today, the back edge of the trough influencing eastern England, while heights rise off the Atlantic across northern and western Britain. At the surface, an area of low pressure will drop SE from the Norwegian Sea toward the North Sea by midnight, associated frontal system ahead of the low will bring cloud and rain to Scotland, mostly dry EIRE + Wales, with an unstable and showery Nly flow across England.

... ENGLAND ...

Cold air aloft towards SE UK (500mb temps AOB -35C) in association with departing upper trough will create steepest lapse rates here  and the strongest likelihood of thunderstorms as diurnal heating increases instability by and through the afternoon. Isolated lightning from heavier showers can't be ruled out anywhere across England though. Any storms will be weak, given dry polar airmass and lack of warmth, but will produce small hail or graupel locally and perhaps gusty winds too.

Issued by: Nick Finnis

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Posted
  • Location: NW Bexley, Kent
  • Weather Preferences: Storms, rain, tornados, funnel clouds and the northern lights
  • Location: NW Bexley, Kent

Towers going up in every direction and some organised looking cells on the horizon to my north and to my west. :)

Edited by Windblade
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