Violent storm, Coulsdon

A brief but violent storm in Coulsdon. Thunder almost continuous before
storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followed by
a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground
lightning and ear splitting thunder. There was a squall too with gusts to 30
mph from a flat calm and just a few hundred metres visibility at one point.
There is flash flooding in the Chipstead Valley below my station.The storm
though moved away remarkably fast, just as well or there would have been
severe flooding.
With so many houses paving their drives these days the run off on my road's
1 in 8 hill was colossal at the height of the storm.

Ian Currie-Coulsdon

On 15 Jul, 15:59, "Ian Currie" <i...@frostedearth.com> wrote:
> A brief but violent storm in Coulsdon. Thunder almost continuous before
> storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followed by
> a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground
> lightning and ear splitting thunder. There was a squall too with gusts to 30
> mph from a flat calm and just a few hundred metres visibility at one point.
> There is flash flooding in the Chipstead Valley below my station.The storm
> though moved away remarkably fast, just as well or there would have been
> severe flooding.
> With so many houses paving their drives these days the run off on my road's
> 1 in 8 hill was colossal at the height of the storm.
>
> Ian Currie-Coulsdon

we hear it in knockholt

clr blu sky now!

There's a guy in Rotterdam who does a podcast.

He did a recording of storms being born over Rotterdam.
He got some close strikes.. pictures included in the AAC file

www.spacemusic.nl

subscribe to his podcast feed.

you're looking for:
soundseeing - Rotterdam Thunderdome

AAC & MP3 formats available

Amazing stuff !!

On Jul 15, 3:59 pm, "Ian Currie" <i...@frostedearth.com> wrote:
> A brief but violent storm in Coulsdon. Thunder almost continuous before
> storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followedby
> a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground
> lightning and ear splitting thunder. There was a squall too with gusts to30
> mph from a flat calm and just a few hundred metres visibility at one point.
> There is flash flooding in the Chipstead Valley below my station.The storm
> though moved away remarkably fast, just as well or there would have been
> severe flooding.
> With so many houses paving their drives these days the run off on my road's
> 1 in 8 hill was colossal at the height of the storm.
>
> Ian Currie-Coulsdon

I observed that storm from here (4½ miles east) and the
conflicting cloud movements and vigour of the convection looked very
dramatic. There was no precipitation at all here. There was a
violent thunderstorm in the Carshalton/Sutton area, quite obviously
the same one, according to my pub mates, one of whom said he'd had 4
inches of rain (measured in a straight-sided bucket). I told him not
to be a c*** and that just one inch in 20 minutes would more than fit
the bill. This didn't go down too well but that's non-weather types
for you.
I'm not convinced that front garden car parks make much
difference. You have to compare the extra paved area with what is
already paved in the garden (the drive, possibly a path) plus the
pavement and half the width of the road along the frontage of the
house. Also, at very high rainfall rates water will run off non-paved
areas. The proportion of the Greater London area that has been paved
for front-garden car parks has been estimated at less than 2%. This
may also include car parks for supermarkets.

Tudor Hughes, Warlingham, NE Surrey, 556 ft.

	#1
Ian Currie	Violent storm, Coulsdon A brief but violent storm in Coulsdon. Thunder almost continuous before storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followed by a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground lightning and ear splitting thunder. There was a squall too with gusts to 30 mph from a flat calm and just a few hundred metres visibility at one point. There is flash flooding in the Chipstead Valley below my station.The storm though moved away remarkably fast, just as well or there would have been severe flooding. With so many houses paving their drives these days the run off on my road's 1 in 8 hill was colossal at the height of the storm. Ian Currie-Coulsdon

	#2
Keith Wassell	Re: Violent storm, Coulsdon On 15 Jul, 15:59, "Ian Currie" <i...@frostedearth.com> wrote: > A brief but violent storm in Coulsdon. Thunder almost continuous before > storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followed by > a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground > lightning and ear splitting thunder. There was a squall too with gusts to 30 > mph from a flat calm and just a few hundred metres visibility at one point. > There is flash flooding in the Chipstead Valley below my station.The storm > though moved away remarkably fast, just as well or there would have been > severe flooding. > With so many houses paving their drives these days the run off on my road's > 1 in 8 hill was colossal at the height of the storm. > > Ian Currie-Coulsdon we hear it in knockholt clr blu sky now!

	#3
BlueLightning	Re: Violent storm, Coulsdon There's a guy in Rotterdam who does a podcast. He did a recording of storms being born over Rotterdam. He got some close strikes.. pictures included in the AAC file www.spacemusic.nl subscribe to his podcast feed. you're looking for: soundseeing - Rotterdam Thunderdome AAC & MP3 formats available Amazing stuff !!

	#4
Tudor Hughes	Re: Violent storm, Coulsdon On Jul 15, 3:59 pm, "Ian Currie" <i...@frostedearth.com> wrote: > A brief but violent storm in Coulsdon. Thunder almost continuous before > storm broke at 14.50hrs BST. 14mm clear hailstones fell and were followedby > a massive deluge giving 18.5mm in 20 minutes with salvoes of cloud-ground > lightning and ear splitting thunder. There was a squall too with gusts to30 > mph from a flat calm and just a few hundred metres visibility at one point. > There is flash flooding in the Chipstead Valley below my station.The storm > though moved away remarkably fast, just as well or there would have been > severe flooding. > With so many houses paving their drives these days the run off on my road's > 1 in 8 hill was colossal at the height of the storm. > > Ian Currie-Coulsdon I observed that storm from here (4½ miles east) and the conflicting cloud movements and vigour of the convection looked very dramatic. There was no precipitation at all here. There was a violent thunderstorm in the Carshalton/Sutton area, quite obviously the same one, according to my pub mates, one of whom said he'd had 4 inches of rain (measured in a straight-sided bucket). I told him not to be a c*** and that just one inch in 20 minutes would more than fit the bill. This didn't go down too well but that's non-weather types for you. I'm not convinced that front garden car parks make much difference. You have to compare the extra paved area with what is already paved in the garden (the drive, possibly a path) plus the pavement and half the width of the road along the frontage of the house. Also, at very high rainfall rates water will run off non-paved areas. The proportion of the Greater London area that has been paved for front-garden car parks has been estimated at less than 2%. This may also include car parks for supermarkets. Tudor Hughes, Warlingham, NE Surrey, 556 ft.