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Storm & Convective Discussion - 04/07/15 Onward - Heat & Plumes

Methuselah

By Methuselah
in Storms & Severe Weather

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Nick L Maestro

Nick L

Posted
  • Location: Cheddington, Buckinghamshire
  • Weather Preferences: Winter: Cold & Snowy, Summer: Just not hot
  • Location: Cheddington, Buckinghamshire
Posted

It's not so much the amount of rain that falls but the speed in which it does so that causes flash flooding.

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Methuselah Maestro

Methuselah

Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.
  • Author
Posted

It's not so much the amount of rain that falls but the speed in which it does so that causes flash flooding.

That's not strictly true, Nick: 75mm of rain, in 12 hours (if the ground is already saturated) will cause flash-flooding. I think?

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Derry O'Brien Newbie

Derry O'Brien

Posted
  • Location: Hunstanton, Norfolk
  • Location: Hunstanton, Norfolk
Posted

That's not strictly true, Nick: 75mm of rain, in 12 hours (if the ground is already saturated) will cause flash-flooding. I think?

Would it count as 'Flash-Flooding' if the flooding occurs over a longer period of time though?

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Nick L Maestro

Nick L

Posted
  • Location: Cheddington, Buckinghamshire
  • Weather Preferences: Winter: Cold & Snowy, Summer: Just not hot
  • Location: Cheddington, Buckinghamshire
Posted

That's not strictly true, Nick: 75mm of rain, in 12 hours (if the ground is already saturated) will cause flash-flooding. I think?

 

Yes I probably didn't word that particularly well.

 

But anyhow, I think we can agree that 43mm didn't fall out of that line that went through Norfolk, but that rainfall rate is certainly possible to achieve!

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Spikecollie Accomplished

Spikecollie

Posted
  • Location: Haute Vienne, Limousin, France (404m ASL)
  • Weather Preferences: Warm and sunny with night time t-storms
  • Location: Haute Vienne, Limousin, France (404m ASL)
Posted

I can believe that a lot of rain came down! I've just driven back from Rawtenstall and it was horrific, first with torrential rain then fog like spray on the M65 and A roads. Mlaaa...some good thunder though, but I was inside so I couldn't see any lightning.

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Methuselah Maestro

Methuselah

Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.
  • Author
Posted

Would it count as 'Flash-Flooding' if the flooding occurs over a longer period of time though?

I was asking myself that very question as I posted, mate...Another question: when is a flash-flood a flash-flood?

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Daniel* Maestro

Daniel*

Posted
  • Location: Rotherhithe, 5.8M ASL
  • Location: Rotherhithe, 5.8M ASL
Posted

That's not strictly true, Nick: 75mm of rain, in 12 hours (if the ground is already saturated) will cause flash-flooding. I think?

I don't think so flash flooding happens quickly. If the ground is saturated or baked hard rain water can not infiltrate thus you get surface run off.

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Methuselah Maestro

Methuselah

Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.
  • Author
Posted

I don't think so flash flooding happens quickly. If the ground is saturated or baked hard rain water can not infiltrate thus you get surface run off.

As my mother often says: the thot plickens. :D

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Derry O'Brien Newbie

Derry O'Brien

Posted
  • Location: Hunstanton, Norfolk
  • Location: Hunstanton, Norfolk
Posted

I don't think so flash flooding happens quickly. If the ground is saturated or baked hard rain water can not infiltrate thus you get surface run off.

 

agreed.. but could the water build up from over time count as flash flooding... or would it still just be flooding?

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Daniel* Maestro

Daniel*

Posted
  • Location: Rotherhithe, 5.8M ASL
  • Location: Rotherhithe, 5.8M ASL
Posted

agreed.. but could the water build up from over time count as flash flooding... or would it still just be flooding?

I've looked online "in US and Europe, a threshold in lag time of approximately 6 hours is often employed to distinguish a flash flood from a slow-rising flood" I never knew that you learn something new everyday. :)

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Derry O'Brien Newbie

Derry O'Brien

Posted
  • Location: Hunstanton, Norfolk
  • Location: Hunstanton, Norfolk
Posted

I've looked online "in US and Europe, a threshold in lag time of approximately 6 hours is often employed to distinguish a flash flood from a slow-rising flood" I never knew that you learn something new everyday. :)

Wow! I really would have thought that the time would be shorter.. more like 2-3 hours!

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Methuselah Maestro

Methuselah

Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.
  • Author
Posted

I think 'thot' is a bad word nowadays :oops::D

Don't let Jeremy Clarkeson know about it, eh? :D

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Derry O'Brien Newbie

Derry O'Brien

Posted
  • Location: Hunstanton, Norfolk
  • Location: Hunstanton, Norfolk
Posted (edited)

Don't let Jeremy Clarkeson know about it, eh? :D

:D

Quick question, i have tried to add a profile picture but its not showing up.. have you any ideas why?

Edited by Derry O'Brien
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Nick L Maestro

Nick L

Posted
  • Location: Cheddington, Buckinghamshire
  • Weather Preferences: Winter: Cold & Snowy, Summer: Just not hot
  • Location: Cheddington, Buckinghamshire
Posted

:D

Quick question, i have tried to add a profile picture but its not showing up.. have you any ideas why?

 

There are some problems with uploading profile pictures at the moment unfortunately.

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Methuselah Maestro

Methuselah

Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.
  • Author
Posted

:D

Quick question, i have tried to add a profile picture but its not showing up.. have you any ideas why?

I can't really help you with that, Derry: we seem to have a glitch in the system. Hence my-own blank space!

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snowprincesspboro Apprentice

snowprincesspboro

Posted
  • Location: peterborough
  • Weather Preferences: extremes, snow, thunder, hot heat, ice cold, etc
  • Location: peterborough
Posted

Some very pretty skies today :)

What the?!?!?! My picture is upside down errrmmm

post-23225-0-49036600-1436275853_thumb.j

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Nick L Maestro

Nick L

Posted
  • Location: Cheddington, Buckinghamshire
  • Weather Preferences: Winter: Cold & Snowy, Summer: Just not hot
  • Location: Cheddington, Buckinghamshire
Posted

Some very pretty skies today :)

What the?!?!?! My picture is upside down errrmmm

 

This seems to be happening a lot too...

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Derry O'Brien Newbie

Derry O'Brien

Posted
  • Location: Hunstanton, Norfolk
  • Location: Hunstanton, Norfolk
Posted

Some very pretty skies today :)

What the?!?!?! My picture is upside down errrmmm

 

Wow! Very nice... shame i had to turn my head upside down to look :p

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matty40s Maestro

matty40s

Posted
  • Location: on a canal , probably near Northampton...
  • Weather Preferences: extremes n snow
  • Location: on a canal , probably near Northampton...
Posted

Just spotted a hook to go with the 43mm....

20150707_142901_zpss9xfsvef.jpg

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Allseasons-Si Maestro

Allseasons-Si

Posted
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
  • Weather Preferences: severe storms,snow wind and ice
  • Location: Hoyland,barnsley,south yorkshire(134m asl)
Posted

Storm just kicked off west of here,hope it holds off until i pick youngen up from school @3pm.

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snowprincesspboro Apprentice

snowprincesspboro

Posted
  • Location: peterborough
  • Weather Preferences: extremes, snow, thunder, hot heat, ice cold, etc
  • Location: peterborough
Posted

Gonna try another as that cloud has grown considerably in around 10 mins, very dark Base as well

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