On Wednesday, September 14, 2016 at 12:43:45 PM UTC+1, xmetman wrote:
On Wednesday, 14 September 2016 09:13:14 UTC+1, Graham Easterling wrote:
After yesterday afternoon's storm (flooding near Truro) and yesterday's early evening storm (15mm in Penzance, 30mm reported at Redruth) came this mornings storm (around 03:00-04:00), with loads more lightning.

It's no unusual to get 3 showers with a flash of lightning within 24 hours in winter, but to have 3 separate (as opposed to immediate following cells) impressive storms in such a short space of time is.

Yesterday, when it was dry it was pretty dark, misty, gloomy, and very cool in the afternoon.

24 hours ending 09:00
Max temp 18.7C (at 09:00 today)
Min Temp 16.6C (mid afternoon yesterday.

Total rainfall in Penzance 25.6mm, of which approx 15mm fell in 40mins commencing 19:00 yesterday.

Plenty of pictures on the web of people enjoying the 'heatwave' in Cornwall yesterday. (It certainly wasn't just grim up north & hot in the south as many posts suggest.)

Exciting though.

The intensity of the rain has caused some sewer overflows, including at Gwithian, where SW Water refuse to except the regular problems.

Plenty of problems still http://www.sas.org.uk/map/ (zoom in to Cornwall)

Due to intensity of the rainfall, not wise to swim in the sea near a river this morning.

Graham
Penzance

Graham

Did you notice any alert from the Met Office for any of you thunderstorms.. I didn't seen any issued myself apart from one for the North of England, and yours seemed to produce much more rainfall.

Bruce.

No, in fact there was no prior indication of thunder for any of the 3 storms on the Penzance 5 day forecast page either. I posted this in an earlier thread cocerning the early evening storm, which gave the largest rainfall in Penzance.

"The current storm I've been tracking since 16:00, but obviously not by the MetO who show the current rainfall risk (at 19:00 & 20:00) as 10%. Perhaps they left a nought off, I mean its' a pretty big storm. The 1st thunder was about 18:00, and over the last 30 minutes (19:00 onwards) it's been virtually continuous. "

Locally, there have been some very high totals, and a number of the sewage storm overflows have overtopped. I was going swimming off Penzance today, but there's of lot of diffuse pollution from the runoff.

An area from Redruth to Truro got a lot of rain in the afternoon storm, some place flooded twice, once in the afternoon storm, and again last night.

This mornings early hours storm floods & damage http://www.piratefm.co.uk/news/lates...s-in-cornwall/

Yesterday aft http://www.westbriton.co.uk/huge-thu...ail/story.html

So 3 major storms in 15 hours, no warning, at the time each one was occuring, no forecast of thunder. This morning at 03:30 the thunder was continuous & almost overhead, yet when I checked, still no thunder forecast. A complete fiasco.

All very dramatic exciting though

Graham
Penzance