"Nick" wrote in message
...
On Sep 15, 6:01 pm, Brian Wakem wrote:
Keith (Southend)G wrote:
Quite persistent rain for a change in the SE today, looking at the
radar I think it's more over Essex than Kent. 2.6mm so far.

Keith (Southend)
http://www.southendweather.net
"Weather Home & Abroad"

14.3mm in Fleet so far and still p*ssing down. Lots of standing water.

--
Brian Wakem

Seems to have been much worse in the central south (I'm in
Southampton) than the southeast. Mostly light but seemed almost
torrential for a short while around 6.30pm. I have to admit I'm amazed
at how active this system, which just seemed to be a minor trough on
the south side of the high, has been. I genuinely expected no more
than occasional drizzle today - and I think that's what the forecast
said, away from the far SE.

Nick

To the northwest of you, Nick, I have measured almost 1 inch of
rain this afternoon/evening, and looking through my records, the
22.4mm that has fallen in Romsey since 0900Z, makes today the
2nd wettest of the year. In fact, today was the soggiest since the
9th Feb when 27.0mm fell.

Nigel

On Sep 15, 10:03*pm, Stephen Burt
wrote:
On 15 Sep, 20:27, Brian Wakem wrote:





Brian Wakem wrote:
Keith (Southend)G wrote:

Quite persistent rain for a change in the SE today, looking at the
radar I think it's more over Essex than Kent. 2.6mm so far.

Keith (Southend)
http://www.southendweather.net
"Weather Home & Abroad"

14.3mm in Fleet so far and still p*ssing down. *Lots of standing water.

Now 33.8mm and still raining moderately.

Much flooding in the vicinity. *Just done a training session with my running
club - absolutely soaked through.

--
Brian Wakem

Blimey. You're not far to the SE of me, yet only 0.8 mm has fallen
here since 0900 ... !

--
Stephen Burt
Stratfield Mortimer, Berskhire- Hide quoted text -

- Show quoted text -

Now that really is an example of a stalled front!

Stephen Burt wrote:

On 15 Sep, 20:27, Brian Wakem wrote:
Brian Wakem wrote:
Keith (Southend)G wrote:

Quite persistent rain for a change in the SE today, looking at the
radar I think it's more over Essex than Kent. 2.6mm so far.

Keith (Southend)
http://www.southendweather.net
"Weather Home & Abroad"

14.3mm in Fleet so far and still p*ssing down. *Lots of standing water.

Now 33.8mm and still raining moderately.

Much flooding in the vicinity. *Just done a training session with my
running club - absolutely soaked through.

--
Brian Wakem

Blimey. You're not far to the SE of me, yet only 0.8 mm has fallen
here since 0900 ... !


Still raining. 37.4mm and counting.


--
Brian Wakem

From the 'Bournemouth Echo'
WETTEST Weather station Altitude Total Daily Rainfall
Farnborough 69 metres 38.4mm
Odiham 118 metres 29.0mm
Clerkenwell 43 metres 15.2mm
London/Heathrow 25 metres 11.2mm
Charlwood 68 metres 11.0mm
Shoeburyness 3 metres 9.0mm
Manston 50 metres 8.0mm
Kenley 170 metres 6.4mm
Andrewsfield 87 metres 6.2mm
Wattisham 89 metres 6.0mm

Phil

On 15 Sep, 20:11, Nick wrote:

Seems to have been much worse in the central south (I'm in
Southampton) than the southeast. Mostly light but seemed almost
torrential for a short while around 6.30pm. I have to admit I'm amazed
at how active this system, which just seemed to be a minor trough on
the south side of the high, has been.

Given the linear nature of the rainfall, I am beginning to suspect
some of my favourite - conditional symmetric instability - might be at
play. Basically the sort of instability you get at thunderstorms but
along frontal surfaces that organises rainfall in narrow, intense
bands - however the alignment of the jet and the local temperature
gradient suggests that it might not be the case.

Certainly I can't remember a day since working in the City where I've
seen such heavy rain throughout the day. Surprised Clerkenwell was
only showing 15mm as per Phil's email just now.

Richard

"Richard Dixon" wrote in message
...
On 15 Sep, 20:11, Nick wrote:

Seems to have been much worse in the central south (I'm in
Southampton) than the southeast. Mostly light but seemed almost
torrential for a short while around 6.30pm. I have to admit I'm amazed
at how active this system, which just seemed to be a minor trough on
the south side of the high, has been.

Given the linear nature of the rainfall, I am beginning to suspect
some of my favourite - conditional symmetric instability - might be at
play. Basically the sort of instability you get at thunderstorms but
along frontal surfaces that organises rainfall in narrow, intense
bands - however the alignment of the jet and the local temperature
gradient suggests that it might not be the case.

Certainly I can't remember a day since working in the City where I've
seen such heavy rain throughout the day. Surprised Clerkenwell was
only showing 15mm as per Phil's email just now.

Richard

I think you will find it was surface convergence at a slow moving front
releasing upper level instability.
I may be wrong of course.

Will
--

On Tue, 15 Sep 2009, Richard Dixon wrote
On 15 Sep, 20:11, Nick wrote:

Seems to have been much worse in the central south (I'm in
Southampton) than the southeast. Mostly light but seemed almost
torrential for a short while around 6.30pm. I have to admit I'm amazed
at how active this system, which just seemed to be a minor trough on
the south side of the high, has been.

Given the linear nature of the rainfall, I am beginning to suspect
some of my favourite - conditional symmetric instability - might be at
play. Basically the sort of instability you get at thunderstorms but
along frontal surfaces that organises rainfall in narrow, intense
bands - however the alignment of the jet and the local temperature
gradient suggests that it might not be the case.

Certainly I can't remember a day since working in the City where I've
seen such heavy rain throughout the day. Surprised Clerkenwell was
only showing 15mm as per Phil's email just now.

Richard

Went to an open-air performance of the Yeomen of the Guard at the Tower
of London last night. Had to beat a retreat at the interval because
even the supplied plastic poncho with several layers underneath couldn't
cope with the downpours, which came in massive pulses (you kept thinking
it was all over). Perhaps if I'd had windscreen wipers on my specs....

--
Kate B

PS 'elvira' is spamtrapped - please reply to 'elviraspam' at cockaigne dot org dot uk if you
want to reply personally

On 16 Sep, 07:33, "Will Hand" wrote:
"Richard Dixon" wrote in message

...





On 15 Sep, 20:11, Nick wrote:

Seems to have been much worse in the central south (I'm in
Southampton) than the southeast. Mostly light but seemed almost
torrential for a short while around 6.30pm. I have to admit I'm amazed
at how active this system, which just seemed to be a minor trough on
the south side of the high, has been.

Given the linear nature of the rainfall, I am beginning to suspect
some of my favourite - conditional symmetric instability - might be at
play. Basically the sort of instability you get at thunderstorms but
along frontal surfaces that organises rainfall in narrow, intense
bands - however the alignment of the jet and the local temperature
gradient suggests that it might not be the case.

Certainly I can't remember a day since working in the City where I've
seen such heavy rain throughout the day. Surprised Clerkenwell was
only showing 15mm as per Phil's email just now.

Richard

I think you will find it was surface convergence at a slow moving front
releasing upper level instability.
I may be wrong of course.

As per above: by the end of my paragraph I'd kind of ruled it out as
the upper jet was in the wrong direction w.r.t. the surface
temperature gradient for it to be CSI, unless there was some sort of
reversal of the jet direction at lower levels !

Richard

"Richard Dixon" wrote:

snip

Certainly I can't remember a day since working in the City where I've
seen such heavy rain throughout the day. Surprised Clerkenwell was
only showing 15mm as per Phil's email just now.

I've put together a sketch map showing the rainfall on
the rainfall day (i.e. 09z 15th to 09z 16th, based on
about 40 ground truth observations including several
noted on usw, modulated by the radar output:

http://www.climate-uk.com/page2.html and scroll to the
bottom of the page.

Highest observations I've seen are 60.2mm at South
Farnborough, 53.2mm at Hampstead obsy, 50.4mm at
Odiham, and 42.5mm at South Woodford.

The published observations of 0.8mm at Wisley and
1.0mm at Kew Gardens are clearly wrong ... indeed,
both sites have been effectively u/s for rainfall for several
months.

Wisley should be somewhere around 10-15mm, and
Kew over 40mm, perhaps over 50.

Philip

On 17 Sep, 14:42, "Philip Eden" philipATweatherHYPHENukDOTcom wrote:

I've put together a sketch map showing the rainfall on
the rainfall day (i.e. 09z 15th to 09z 16th, based on
about 40 ground truth observations including several
noted on usw, modulated by the radar output:

http://www.climate-uk.com/page2.html*and scroll to the
bottom of the page.

Jeepers it was a narrow band. I was in the Gherkin earlier in the
evening and it was hammering down for a good hour, and was almost dry
in Blackheath (SE London) when I got back.

Richard