Storms and Convective discussion - September 2023

[Supacell]

September already, that happened quickly! Where did summer go? Well, looks like it's on its way back this weekend and beyond.

So here we go, a new thread for September, first month of Autumn, but still a month where thunderstorms can and do occur. Having said that the first few days of the month at least are offering up low chances of anything thundery with some much yearned summer like sunshine being the flavour of our weather. The exception is today which does look more unsettled and showery, more especially across southeastern parts.

For me, and a lot of us, August was fairly quiet for storms. For those who want the storms, let's hope for an uptick in activity as we head through September.

August thread here for those who want to look back.

Keep posting and remember to keep on topic and to be nice and respectful to others.

Edited September 1 by Supacell

[Wivenswold]

Bubbling-up nicely over London at the moment. Lots of moisture for the atmosphere to suck up here in Essex. Winds aloft probably too fast for any storm cells though. 

[Vortex3929]

Meto just popped a yellow warning for storms out in parts of SE, just as those cells look heavy on radar.  Cautious alert, or another kiss of death by meto

[alexisj9]

4 minutes ago, Vortex3929 said:

Meto just popped a yellow warning for storms out in parts of SE, just as those cells look heavy on radar.  Cautious alert, or another kiss of death by meto

Looks like they are just building in a convergence area, hence the straight line. I'd expect main hazard heavy rain with flash floods.

[minus10]

1 hour ago, Vortex3929 said:

Meto just popped a yellow warning for storms out in parts of SE, just as those cells look heavy on radar.  Cautious alert, or another kiss of death by meto

Shame its not further west...atmosphere feels ripe for it with high humidity and a calm stillness you often get before a storm...

[Jamie M]

6z AROME soundings for 1500 UTC reveals upwards of 2500 J/kg here 

[WeatherArc]

Euros going for some mid week storms, hopefully fourth time lucky 😂

What is it with this model and dewpoints? 

Regardless, pretty decent cape on offer, could be a good thundery breakdown to this heat. 

[minus10]

Storms in Kent anybody..?

[Jamie M]

7 minutes ago, minus10 said:

Storms in Kent anybody..?

Haven't seen anything from underneath it but radar sure does show it's nasty as well as the sheared anvil 

Edited September 1 by Jamie M

[Vortex3929]

14 minutes ago, minus10 said:

Storms in Kent anybody..?

Rumble of thunder heard from the Maidstone cell

[Jamie M]

Neat shelfie 

[Vortex3929]

10 minutes ago, Jamie M said:

Neat shelfie 

Few flashes and rumbles here from it. Can't see the cloud structure though unfortunately. Great pic though, jealous!

[Lauren]

That was crazy! I haven't seen rain like that in years. Everywhere flooded in minutes. Driving up the hill to my house was like driving through a waterfall!

[James Maidstone]

It was very impressive from Maidstone looking North over the Downs around 4:30.  The white cloud dropping down was menacing and circulating for about 30 seconds

Edited September 1 by James Maidstone

[Allseasons-si]

A line of convergance seems to be growing from Fakenham to gravesend looking at the wind observation map.

 

Wind Map - Britain Observations

WWW.XCWEATHER.CO.UK

 

Edited September 1 by Allseasons-si
typo

[Wimbledon88]

28 minutes ago, Lauren said:

That was crazy! I haven't seen rain like that in years. Everywhere flooded in minutes. Driving up the hill to my house was like driving through a waterfall!

Can see the tops of the massive thunder clouds from here in South London.

[Vortex3929]

Not far from Lauren.. some photos of flooding 

 

Edited September 1 by Vortex3929

[Jamie M]

One of the pictures off my phone I got of the North Kent cell, decent updraft and downdraft separation.

Timelapse is here

[Eagle Eye]

7 minutes ago, Jamie M said:

One of the pictures off my phone I got of the North Kent cell, decent updraft and downdraft separation.

Timelapse is here

Mentioned the possibility of Supercellular characteristics yesterday or potentially a Supercell. Not a Supercell but definetely had the characteristics of one to be fair to me. 

[Buzzard]

Well those two showers South of Cambridge look stunning in the sunset from here. 
 

wont bother with a picture as it never does it justice. 

[Jamie M]

Wall cloud at 17:44 BST on the North Kent cell

[Flash bang flash bang etc]

Weds thurs and Fri has low potential for the south. Chances are becoming more frequent, but still low confidence. Autumn is beginning and the tables and chairs are turning. We wait for an actual result from one of these opportunities however.

[Jamie M]

Pictures from yesterday's storm which had supercellular characteristics

[Ben Sainsbury]

24 minutes ago, Flash bang flash bang etc said:

Weds thurs and Fri has low potential for the south. Chances are becoming more frequent, but still low confidence. Autumn is beginning and the tables and chairs are turning. We wait for an actual result from one of these opportunities however.

Given flow is more southerly or south-southeasterly, it looks like if we do get some storms, then more should be at risk than recent events!

Edited September 2 by Ben Sainsbury

[Sprites]

Devon and Cornwall probably more likely to see imports first next week. 

Edited September 2 by Sprites