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The Storms & Severe Weather Thread


CityDave

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Have heard throughout the day differing predictions on where tonight's/early morning thunderstorms. The general opinion is that they will start as the sun goes down in the South of England and work their way north during the night, how far north I don't know. Met Office going for about 10pm in the west country for the first thunderstorms.

So good for some for night time storms.

Currently we are seeing a small amount of lightning strikes shown on the detectors around Southern Ireland and in the Irish Sea north of Devon and Cornwall. Some small isolated rain showers showing up on the radar down the east coast from Fife down to Suffolk. Larger showers now showing up in Wales and in Devon.

Edit: Aberystwyth has the first UK land lightning strikes of the evening.

Edited by CityDave
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Latest warning from TORRO.

TORRO SEVERE THUNDERSTORM WATCH 2015/004 and TORRO CONVECTIVE DISCUSSION 2015/007

A TORRO SEVERE THUNDERSTORM WATCH and CONVECTIVE DISCUSSION have been issued at 21:35GMT on Friday July 3rd 2015

Valid from/until: 21:35-06:00 (SVR WATCH) and 21:25-12:00 (CONV DISCUSSION) on Friday July 3rd/Saturday July 4th 2015 for the following regions of the United Kingdom & Eire:

Much of England along with SE Wales (SEVERE THUNDERSTORM WATCH)

Much of western England/Wales into Scotland, and eastern Ireland, and Northern Ireland (CONVECTIVE DISCUSSION)

THREATS

SVR WATCH (blue box): Hail to 20-50mm diameter; wind gusts to 60mph; frequent CG lightning; locally heavy rainfall.

CONV DISCUSION (yellow box): Hail to 15mm diamter; wind gusts to 50mph; CG lightning; locally heavy rainfall.

SYNOPSIS

A plume of moisture and instability is moving quickly northwards across the British Isles this evening. Scattered thunderstorms have formed along the warm front in N Wales/N Midlands, and within the moisture plume close to Dorset. Other thunderstorms have formed close to southern Ireland. As a strong upper trough moves in overnight, thunderstorms are expected to increase in coverage across much of the British Isles, but the higher instability/shear combination will be reserved for the severe thunderstorm watch area. However, within this area, there is a stronger capping inversion, especially with south-eastward extent. Thus, storms may be more isolated towards SE England, and indeed may not develop here at all.

The mixture of ~1000J/Kg of elevated CAPE and shear values of 30-40 knots across the severe thunderstorm watch area suggests that elevated supercells and well-organised multicells may develop, bringing the risk of large hail and locally strong winds. If storms tend to congeal into one or more clusters, or even an MCS, a more widespread wind threat could emerge. The tornado risk is considered low due to the slightly elevated nature of the storms. However, there may be a brief window of oppurtunity in the higher instability area in the south-east of the watch.

For the convective discussion area, CAPE is somewhat more meagre, although forcing for ascent from the approaching upper trough will be stronger, and so thunderstorms are still likely. A few may become strong with moderately large hail and a few strong wind gusts.

The activity will continue to shift northwards overnight with the risk decreasing quickly in the wake of it across southern and central areas later in the night.

Forecaster: RPK.

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  • post-17481-0-30815000-1435959893_thumb.j
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Latest warning from TORRO.

TORRO SEVERE THUNDERSTORM WATCH 2015/004 and TORRO CONVECTIVE DISCUSSION 2015/007

A TORRO SEVERE THUNDERSTORM WATCH and CONVECTIVE DISCUSSION have been issued at 21:35GMT on Friday July 3rd 2015

Valid from/until: 21:35-06:00 (SVR WATCH) and 21:25-12:00 (CONV DISCUSSION) on Friday July 3rd/Saturday July 4th 2015 for the following regions of the United Kingdom & Eire:

Much of England along with SE Wales (SEVERE THUNDERSTORM WATCH)

Much of western England/Wales into Scotland, and eastern Ireland, and Northern Ireland (CONVECTIVE DISCUSSION)

THREATS

SVR WATCH (blue box): Hail to 20-50mm diameter; wind gusts to 60mph; frequent CG lightning; locally heavy rainfall.

CONV DISCUSION (yellow box): Hail to 15mm diamter; wind gusts to 50mph; CG lightning; locally heavy rainfall.

SYNOPSIS

A plume of moisture and instability is moving quickly northwards across the British Isles this evening. Scattered thunderstorms have formed along the warm front in N Wales/N Midlands, and within the moisture plume close to Dorset. Other thunderstorms have formed close to southern Ireland. As a strong upper trough moves in overnight, thunderstorms are expected to increase in coverage across much of the British Isles, but the higher instability/shear combination will be reserved for the severe thunderstorm watch area. However, within this area, there is a stronger capping inversion, especially with south-eastward extent. Thus, storms may be more isolated towards SE England, and indeed may not develop here at all.

The mixture of ~1000J/Kg of elevated CAPE and shear values of 30-40 knots across the severe thunderstorm watch area suggests that elevated supercells and well-organised multicells may develop, bringing the risk of large hail and locally strong winds. If storms tend to congeal into one or more clusters, or even an MCS, a more widespread wind threat could emerge. The tornado risk is considered low due to the slightly elevated nature of the storms. However, there may be a brief window of oppurtunity in the higher instability area in the south-east of the watch.

For the convective discussion area, CAPE is somewhat more meagre, although forcing for ascent from the approaching upper trough will be stronger, and so thunderstorms are still likely. A few may become strong with moderately large hail and a few strong wind gusts.

The activity will continue to shift northwards overnight with the risk decreasing quickly in the wake of it across southern and central areas later in the night.

Forecaster: RPK.

Attached Thumbnails

  • post-17481-0-30815000-1435959893_thumb.j

So in summary

A shit day tomorrow !

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All kicking of over the last hour being led by a warm front with smaller storms in a line from Lancaster to the Humber, now approaching Cumbria and Yorkshire. Should be in Scotland within the next two hours maybe sooner, didn't expect this to form so far north as it did. Behind this storms are popping up almost anywhere, but the real monsters are close to the cold front in the south of England, in the south and along the coast.

Webcam for the coast at Bournemouth http://www.bournemouth.gov.uk/AttractionsLeisure/BeachesandWaterfront/PierApproachWebcam2.aspx

lightning almost every couple of seconds.

Edited by CityDave
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London being lit up just now http://www.visitlondon.com/discover-london/tower-bridge-webcam

That storm that moved onto land at Bournemouth is being regarded as a supercell and has now a developed core, this doesn't sound good if you are in its path.

The Storms in the north look to be running out of puff.

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Aye it's braw. My wee lass loves coming up here to stay in a big wooden triangle! :)

Does it still get called Campbells Kingdom.

The auld man was a right c**t and liked to threaten folk with a shotgun.

Edited by Zen Archer
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ETA: Just asked the faither-in-law. Apparently yes, it was known as Campbell's Kingdom and yes, apparently Auld Man Campbell was a c**t.

You could, almost, refer to him as a scunner. Yeah?

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Post box hit by lightning in North London, just as well no one posts letters anymore or lived in there (knowing how difficult it is to find decent size property).

post-8968-0-62744700-1436120493.jpg

post-8968-0-87985300-1436120503.jpg

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