We had a brief thunderstorm around 15:00. Brief burst of heavy rain.

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%. Great the way the forecasts prepare you. 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. The best (or worst - depending on your view) storm for a few years. The lightning radar seems to be missing at least 50% of the flashes. It's an absolute cracker

The rain really set in around 19:00 is currently torrential, I'll supply the actual figure later, certainly a lot in a very short space of time.

Quite exciting really, 2 thunderstorm in 1 day. Made up for it being distinctly cool (relative to the month so far). Maximum temperature was just after midnight http://www.nci-stives.org/weather/Cu...antage_Pro.htm

A 3rd storm seems to be heading this way. http://www.lightningmaps.org/?lang=e...2;dl= 2;dc=0;

Back to the beach tomorrow as the warm air returns from the east. (Well after taking my disabled daughter horse riding in the morning).

Graham
Penzance

Graham Easterling wrote:

We had a brief thunderstorm around 15:00. Brief burst of heavy rain.

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%. Great the
way the forecasts prepare you. Perhaps they left a nought off, I mean its' a
pretty big storm.


A little bit better here, Graham, but not a lot. The Tideswell forecast issued
at 1800 gave a 60% probability of rain at 1900 and 30% probability at 2000. No
mention of thunder despite the fact that we've just had the most spectacular
thunderstorm since we moved here. By 1800 it was very obvious from the radar
that we were going to get hammered but that sort of information doesn't seem to
feed into the production of these forecasts. When it gets down to
site/time-specific forecasting the reliability of these automated forecasts is
a long way short of ideal. They don't do the reputation of the Met Office any
good at all. The product just isn't good enough.


--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org

Two big thunderstorms here today, 1st one started around 09:00 and was
quite spectacular with frequent fork lightning, some of which was
striking the sea out in Lyme Bay.

Afterwards, from 10:30 am onwards it was then fairly cloudy with just a
few sunny intervals, calm and humid.

The 2nd thunderstorm arrived around 15:00 and wasn't quite so intense as
the first storm but then cleared quickly to a sunny late-afternoon and
evening.

When the sun came the temperature rose quickly despite being so late in
the day and the DP reached a maximum of 21C at 17:05. If the clearance
had come sooner then the DPs could have gone much higher.

Most of the heavy rainfall seemed to miss here with a total today of 4.0 mm.

Now a warm, damp and very humid evening.

(20:05), 19.3C, RH 98%, DP 18.6C, 1007 hPa (S), Wind 2 mph (direction
all over the place!).

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk

On Tuesday, September 13, 2016 at 8:06:09 PM UTC+1, Nick Gardner wrote:
Two big thunderstorms here today, 1st one started around 09:00 and was
quite spectacular with frequent fork lightning, some of which was
striking the sea out in Lyme Bay.

Afterwards, from 10:30 am onwards it was then fairly cloudy with just a
few sunny intervals, calm and humid.

The 2nd thunderstorm arrived around 15:00 and wasn't quite so intense as
the first storm but then cleared quickly to a sunny late-afternoon and
evening.

When the sun came the temperature rose quickly despite being so late in
the day and the DP reached a maximum of 21C at 17:05. If the clearance
had come sooner then the DPs could have gone much higher.

Most of the heavy rainfall seemed to miss here with a total today of 4.0 mm.

Now a warm, damp and very humid evening.

(20:05), 19.3C, RH 98%, DP 18.6C, 1007 hPa (S), Wind 2 mph (direction
all over the place!).

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk

This afternoon's fairly brief storm (in Penzance) caused flooding in the Truro area. The recent one was certainly far worse here. Around 15mm in the 40 minutes 19:00-19:40. Total for the day (so far) 18.1mm, but more on the horizon. I suspect there are some higher figures just to the east.

When I came back from the Old Success yesterday evening the car thermometer was showing 20C, people surfing until it was pitch black.

Much of this afternoon it's been around 17C, it's many weeks since it was that low in throughout the afternoon, blustery N wind to go with it, very variable in strength. Unusual to get a night warmer than the following day at this time of year.

Graham
Penzance

On Tuesday, September 13, 2016 at 8:24:14 PM UTC+1, Graham Easterling wrote:
On Tuesday, September 13, 2016 at 8:06:09 PM UTC+1, Nick Gardner wrote:
Two big thunderstorms here today, 1st one started around 09:00 and was
quite spectacular with frequent fork lightning, some of which was
striking the sea out in Lyme Bay.

Afterwards, from 10:30 am onwards it was then fairly cloudy with just a
few sunny intervals, calm and humid.

The 2nd thunderstorm arrived around 15:00 and wasn't quite so intense as
the first storm but then cleared quickly to a sunny late-afternoon and
evening.

When the sun came the temperature rose quickly despite being so late in
the day and the DP reached a maximum of 21C at 17:05. If the clearance
had come sooner then the DPs could have gone much higher.

Most of the heavy rainfall seemed to miss here with a total today of 4.0 mm.

Now a warm, damp and very humid evening.

(20:05), 19.3C, RH 98%, DP 18.6C, 1007 hPa (S), Wind 2 mph (direction
all over the place!).

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk

This afternoon's fairly brief storm (in Penzance) caused flooding in the Truro area. The recent one was certainly far worse here. Around 15mm in the 40 minutes 19:00-19:40. Total for the day (so far) 18.1mm, but more on the horizon. I suspect there are some higher figures just to the east.

When I came back from the Old Success yesterday evening the car thermometer was showing 20C, people surfing until it was pitch black.

Much of this afternoon it's been around 17C, it's many weeks since it was that low in throughout the afternoon, blustery N wind to go with it, very variable in strength. Unusual to get a night warmer than the following day at this time of year.

Graham
Penzance

Charles Winpenny (AKA Cornwall CAM http://www.cornwallcam.co.uk/ ) recorded 30mm in 15 minutes during this evenings storm at Redruth. This followed 10mm in the early thundery showers /storms.

Graham
Penzance