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richardabdn
24 July 2013 09:46:37

Lightning on and off since the early hours here.

Originally Posted by: howham 


Heard a few rumbles here - the first in over a year - and rain rate peaked at 98.4mm/hr but didn't see any lightning due to thick fog

Aberdeen: The only place that misses out on everything


2023 - The Year that's Constantly Worse than a Bad November
2024 - 2023 without the Good Bits
howham
24 July 2013 12:32:38
I was woken by heavy rain about 2am but no thunder. Woken again at 5.20am with some sporadic thunder and lightning, dozed off once more and then woke to one single ear splitting boom about 6.20am. Rainfall had accumulated to over 27mm since midnight.
idot
  • idot
  • Advanced Member
24 July 2013 13:38:48

warnings now out for SE sat night and into sunday. Heavy showers or thunderstorms. 


 


i shall be in east sussex then, which is nice.


Thunderstorm watching with a pint of Long Man it is then.


 


https://twitter.com/JohnathanSizz 

 
idj20
24 July 2013 13:55:22


warnings now out for SE sat night and into sunday. Heavy showers or thunderstorms. 


 


i shall be in east sussex then, which is nice.


Thunderstorm watching with a pint of Long Man it is then.


 



Originally Posted by: idot 



That is of renewed interest for me as far as my area is concerned. Going by the events of the other night, it does seem that anything is possible after all. 

Folkestone Harbour. 
VIRTUAL STORMCHASER
24 July 2013 14:38:15

How is the dewpoint measured? & what is its effect when we experience very aggressive weather like overnivht last night and this morning? Cheers VSC

Originally Posted by: Medlock Vale Weather 


The dew point is water vapour in the air - places like Chicago, New York, and in "Tornado alley" see dew points into the upper 20's! so as you can imagine this helps fuel those massive super cells over there and of course as well as other factors like the hot Gulf of Mexico air bumping into cold air from Canada also helps spawn the storms over there, of course the dew point is just one important factor, but it's by no means the only one.

Originally Posted by: VIRTUAL STORMCHASER 



Hi, thanks for that....... But, how and at what height is the "Dew Point" measured?

Also, whats the difference between "surface storms" & "elevated storms" ??
And what does the difference mean to you and I on the ground.....?
Cheers
VSC
RobN
  • RobN
  • Advanced Member
24 July 2013 14:42:44



warnings now out for SE sat night and into sunday. Heavy showers or thunderstorms. 


 


i shall be in east sussex then, which is nice.


Thunderstorm watching with a pint of Long Man it is then.


 



Originally Posted by: idj20 



That is of renewed interest for me as far as my area is concerned. Going by the events of the other night, it does seem that anything is possible after all. 


Originally Posted by: idot 


Twice in one week for a night time lightning display would be remarkable in the "modern summer".


This time I shall have my camera gear out, sorted and ready, rather than be stumbling about bleary-eyed at silly o'clock thinking "which cupboard did I put my tripod in?". (OK that's probably put the kibosh on the event )

Rob
In the flatlands of South Cambridgeshire 15m ASL.
idj20
24 July 2013 15:05:10




warnings now out for SE sat night and into sunday. Heavy showers or thunderstorms. 


 


i shall be in east sussex then, which is nice.


Thunderstorm watching with a pint of Long Man it is then.


 



Originally Posted by: RobN 



That is of renewed interest for me as far as my area is concerned. Going by the events of the other night, it does seem that anything is possible after all. 


Originally Posted by: idj20 


Twice in one week for a night time lightning display would be remarkable in the "modern summer".


This time I shall have my camera gear out, sorted and ready, rather than be stumbling about bleary-eyed at silly o'clock thinking "which cupboard did I put my tripod in?". (OK that's probably put the kibosh on the event )


Originally Posted by: idot 



 Indeed, especially since that last one took me by surprise! Had all my gear ready and standing by but I was all giddy with the excitement that it took me a while to get around to setting the camera up. Mind you, as I've mentioned before, conditions was just too wild and dangerous to take a decent photograph of it so hopefully this upcoming one may be a bit more "gentle" - assuming it does come about as of course, thunderstorms are very unpredictable beasts at the best of times.

Folkestone Harbour. 
idj20
24 July 2013 17:46:03

Next chance saloon for thundery activity over the South East for Saturday evening?

GFS: http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=prec&HH=84&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=

Even NAVGEM is in agreement: http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=nogaps&MODELLTYP=1&BASE=-&VAR=prec&HH=96&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=

All backed up with high dewpoint temperatures as well. So it's a question of it slipping into NAE's time frame and fine tuning things as we get nearer to the time.

Folkestone Harbour. 
Medlock Vale Weather
24 July 2013 18:29:53


How is the dewpoint measured? & what is its effect when we experience very aggressive weather like overnivht last night and this morning? Cheers VSC

Originally Posted by: VIRTUAL STORMCHASER 


The dew point is water vapour in the air - places like Chicago, New York, and in "Tornado alley" see dew points into the upper 20's! so as you can imagine this helps fuel those massive super cells over there and of course as well as other factors like the hot Gulf of Mexico air bumping into cold air from Canada also helps spawn the storms over there, of course the dew point is just one important factor, but it's by no means the only one.


Originally Posted by: Medlock Vale Weather 



Hi, thanks for that....... But, how and at what height is the "Dew Point" measured?

Also, whats the difference between "surface storms" & "elevated storms" ??
And what does the difference mean to you and I on the ground.....?
Cheers
VSC

Originally Posted by: VIRTUAL STORMCHASER 


My Dew Point monitor is housed with my air tempertaure sensor - both are about 6 feet above the ground surface as to give the most accurate reading. You're second question I'm not too sure about but I'm sure someone will be able to answer it.

Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
idj20
24 July 2013 18:41:27



How is the dewpoint measured? & what is its effect when we experience very aggressive weather like overnivht last night and this morning? Cheers VSC

Originally Posted by: Medlock Vale Weather 


The dew point is water vapour in the air - places like Chicago, New York, and in "Tornado alley" see dew points into the upper 20's! so as you can imagine this helps fuel those massive super cells over there and of course as well as other factors like the hot Gulf of Mexico air bumping into cold air from Canada also helps spawn the storms over there, of course the dew point is just one important factor, but it's by no means the only one.


Originally Posted by: VIRTUAL STORMCHASER 



Hi, thanks for that....... But, how and at what height is the "Dew Point" measured?

Also, whats the difference between "surface storms" & "elevated storms" ??
And what does the difference mean to you and I on the ground.....?
Cheers
VSC

Originally Posted by: Medlock Vale Weather 


My Dew Point monitor is housed with my air tempertaure sensor - both are about 6 feet above the ground surface as to give the most accurate reading. You're second question I'm not too sure about but I'm sure someone will be able to answer it.


Originally Posted by: VIRTUAL STORMCHASER 



I guess surface storms are ones that feed on heat rising from the ground whereas the elevated ones are the ones that feeds on warm and moist air in the mid layer even though it's quite cool at sea level but still has plenty of room aloft for convective development anyway.
  The advantages of elevated storms is that they can keep going into the night even though there isn't any solar heating, whereas surface-based storms usually die out the moment the sun sets - unless the ground is good at retaining the heat and/or there's still enough instability well into the night. 

But that could be me talking out of my backside. Again.

Folkestone Harbour. 
Phil G
24 July 2013 19:35:22


Next chance saloon for thundery activity over the South East for Saturday evening?

GFS: http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=prec&HH=84&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=

Even NAVGEM is in agreement: http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=nogaps&MODELLTYP=1&BASE=-&VAR=prec&HH=96&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=

All backed up with high dewpoint temperatures as well. So it's a question of it slipping into NAE's time frame and fine tuning things as we get nearer to the time.


Originally Posted by: idj20 


Hope it all moves a bit West Ian as looks a bit marginal at the mo to me. Saying that, there maybe a better chance as the airflow appears to be more of a straight south to north rather than the ssw to nne we have had over the last few years which has provided so many near misses. 

ITSY
  • ITSY
  • Guest Topic Starter
24 July 2013 20:11:01

GEM is a belter!

http://www.meteociel.fr/modeles/geme_cartes.php?ech=6&code=0&carte=0&mode=2&archive=0



good enough Phil?  

cturbo20
24 July 2013 20:44:40

Still waiting for a storm,had a couple flirt but were miles away,maybe the weekend might bring something,one forecast is sayin there might be storms over in the south east area but could move further west but dont know how far if any and another one is saying nothing. What do you experts reckon

Phil G
24 July 2013 21:18:23


GEM is a belter!

http://www.meteociel.fr/modeles/geme_cartes.php?ech=6&code=0&carte=0&mode=2&archive=0



good enough Phil?  


Originally Posted by: ITSY 


That'll do nicely!

Gaz
  • Gaz
  • Advanced Member
24 July 2013 21:39:19

CLOSING

Gary, Torquay, Devon. 85 Meters / 279 Feet ASL


Thunderstorms in 2013: 28th September 3.30am - 8.00am Storm that lasted over 4 Hours
Thunderstorms in 2013: 17th June 6.30pm. bright Lightning out at sea - Deep Bass Thunder
Thunderstorms in 2012: 11th August 10:30pm. bright Lightning - Deep Bass Thunder
Thunderstorms in 2012: 28th June 2:00am From Spainish Plume. 5 sec lightning flashes
Thunderstorms (Flickering Lightning) in 2012: 26th May 2:30 From Spainish Plume





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