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Convective / storm Discussion - 22nd May 2014 onwards

Liam J

By Liam J
in Storms & Severe Weather

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Daniel* Maestro

Daniel*

Posted
  • Location: Rotherhithe, 5.8M ASL
  • Location: Rotherhithe, 5.8M ASL
Posted

Well to the north Yorkshire there are some storms nudging northwards, quite potent producing Thunder and Lightning :) Them rash of storms are capable of delivering the goods :good:

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boxy Apprentice

boxy

Posted
  • Location: Castleford West Yorkshire
  • Location: Castleford West Yorkshire
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Posted

Storm in York now, photo from twitter

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SnowJoke Enthusiast

SnowJoke

Posted
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
Posted (edited)

Storm in York now, photo from twitter

 

Holy CRAP! That is a nice shelf cloud, structure above looks like it may be super cellular, hope people get some more pictures, and some of the base of that beast...

Edited by SnowJoke
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Convective Community Regular

Convective

Posted
  • Location: Douglas, Isle of Man - 380ft/116m ASL
  • Weather Preferences: Warm summers, cold winters.. How it should be!
  • Location: Douglas, Isle of Man - 380ft/116m ASL
Posted

Storm in York now, photo from twitter

 

 

WOW !!!!......

 

Took the words out of my mouth! That looks beautiful!

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Guest

Guest

Posted
Posted

Holy CRAP! That is a nice shelf cloud, structure above looks like it may be super cellular, hope people get some more pictures, and some of the base of that beast...

It's a lovely shelf cloud indeed. However it isn't supercellular, before everyone gets too excited. It's a squall line feature :)

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Guest

Posted
Posted

supercells can develop on squall lines :).......

I know, my response was intended for SnowJoke :) Incidentally all the best Google images of squall lines do look to have a supercell storm in them :D The cell over York isn't showing any supercellular signs though.

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SnowJoke Enthusiast

SnowJoke

Posted
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
Posted (edited)

It's a lovely shelf cloud indeed. However it isn't supercellular, before everyone gets too excited. It's a squall line feature :)

 

I mentioned super cellular upon looking at the precipitation radar, there appeared to be an odd area of rainfall at the back edge of the storm which spread out as though it was moving in the opposite direction to the main forward thrust of the storm, yes it's within a squall line feature, but some squall lines in the UK are known to have embedded storms with super cell characteristics, and a lot of super cells often have very large well defined shelf clouds on their outflow... We won't be able to tell unless there is some more photographic or video footage showing the base and inflow area to determine whether rotation was present.

Edited by SnowJoke
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Mokidugway Maestro

Mokidugway

Posted
Posted

I know, my response was intended for SnowJoke :) Incidentally all the best Google images of squall lines do look to have a supercell storm in them :D The cell over York isn't showing any supercellular signs though.

I do agree with you , but it does look impressive though :).......
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Supacell Accomplished

Supacell

Posted
  • Location: Belper, Derbyshire
  • Weather Preferences: Thunderstorms
  • Location: Belper, Derbyshire
Posted (edited)

Tomorrow looking similar in some ways to Thursday with an area of thundery rain (thus heavy rain with no thunder whatsoever) heading north and west with brighter skies and thundery showers following behind. CAPE values being shown by GFS and WRF are not as high as those on Thursday though so storms less severe or intense but considering I saw one flash of lightning it would not be too hard to beat my storm for intensity.

Edited by Supacell
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DAVID SNOW Veteran

DAVID SNOW

Posted
  • Location: Near Romford Essex.
  • Location: Near Romford Essex.
Posted

F4 or 5 tornado plowing through local cricket club right now, video to follow , oh, and light rain :)..!!!....

 

If that was true, could you imagine the captain saying  "Come on chaps, lets finish the over before we retire to the bar? :drinks:

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Muffelchen Enthusiast

Muffelchen

Posted
  • Location: Beverley, E Yorks, 19m ASL
  • Weather Preferences: Snow, Thunder - not necessarily at the same time!
  • Location: Beverley, E Yorks, 19m ASL
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Posted (edited)

OK I think I can lend some credence to Vlad's story and the shelf cloud in York. I had noticed the development in the clouds and heard my first thunder to the NW at 19:30 and the convection continued to back build towards the SE very rapidly and we had thunder from two separate storms from about 20:15: one was a new one that had  developed SE of the previous one and had skirted to my NW and the other developed to my SW and moved towards me. The movement was definitely to the right of the previous storms and the squall line that I have since seen on NW radar.

 

This storm was accompanied by a very impressive shelf cloud - one of the best I have ever seen and I was pointing it out to my daughters with whom I was playing frisbee. This shelf cloud was accompanied by very rapid vertical motion and associated rotors beneath it and there were frequent tendrils of condensation beneath it. These could, at a distance, easily be mistaken for suction vortices but they were not: they were  purely associated with the rapid upward motion of the saturated air beneath the shelf cloud. I have attached a piccie of the shelf cloud over Beverley but as it was taken with my mobile, it is not great. That said, it was a very impressive feature and stretched clear across a fair portion of the sky - as in a linear storm system.

 

However, that said, that does not mean that this storm was not rotating: it clearly was and the differential lateral motion was clear to see as there was not a lot of rain associated with it (I think it was dying by this stage as the lightning was becoming very sporadic and there had been constant thunder half an hour or so earlier). This showed that the rear of the storm was moving East whilst the front was moving West and you could watch the scud make its way down one side and back up the other in front of you.

 

So I can confirm what Mokidugway and SnowJoke have surmised and explain the observations of Vlad. I hope this helps and it certainly made up for the bust that was yesterday up here!

 

Muff

 

 

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Edited by Muffelchen
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SnowJoke Enthusiast

SnowJoke

Posted
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
  • Location: Milton Keynes, Buckinghamshire, England. 108.7m ASL
Posted (edited)

Thank you Muffelchen I didn't think I was imagining rotation. I was looking at the SAT24 vissable radar playback up until it got too dark to see another frame, and that particular cell on satellite did show clockwise rotation with a small up draft at the rear of the cell protruding above the rest of the anvil which looked like an overshooting top. This is evident on the sat photo's if anyone has access to some higher resolution images I'd very much like to take a look at them.BTW: Nice piccy of the approaching shelf cloud  :clapping:

Edited by SnowJoke
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William Grimsley Seasoned

William Grimsley

Posted
  • Location: Newton Poppleford, Devon, UK
  • Weather Preferences: Thunderstorms, Snow, High Winds.
  • Location: Newton Poppleford, Devon, UK
Posted

Tomorrow looking similar in some ways to Thursday with an area of thundery rain (thus heavy rain with no thunder whatsoever) heading north and west with brighter skies and thundery showers following behind. CAPE values being shown by GFS and WRF are not as high as those on Thursday though so storms less severe or intense but considering I saw one flash of lightning it would not be too hard to beat my storm for intensity.

Is tomorrow looking good for here?

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Robbie Garrett Seasoned

Robbie Garrett

Posted
  • Location: London, UK
  • Weather Preferences: MCC/MCS Thunderstorms
  • Location: London, UK
Posted

Storm in York now, photo from twitter

London had something like that back in April 2012, coming north to south during that spell of very wet and stormy weather. It was a beast. The thunder rocked half of London. I wonder if it was super cellular. 

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Flipflop Contributor

Flipflop

Posted
  • Location: East Hull, East Yorkshire
  • Weather Preferences: Warm and stormy.
  • Location: East Hull, East Yorkshire
Posted (edited)

Grabbed this whilst out for strikes, not sure if this is associated with the leeds cell but did see left to right pulses sooo....nice to see some motion in the air for a change.

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Edited by Raptor Raw
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East_England_Stormchaser91 Veteran

East_England_Stormchaser91

Posted
  • Location: King’s Lynn, Norfolk.
  • Weather Preferences: Hot and Thundery, Cold and Snowy
  • Location: King’s Lynn, Norfolk.
Posted

Supercells are a difficult beast to identify in uk as are often much less well defined as their American cousins !!.....

28th June 2012 were the best defined supercells that the UK has probably ever seen.
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