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This was passing up the severn valley. Had a lot of hail today. Loads of scud associated with this storm, lowering of cloud where the sun was.
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Passing storm - pseudo tornado - 17th March 2012
#1 Guest_Chris Lloyd_*
Posted 17 March 2012 - 18:37
Watched an interesting storm pass by at around 5-30 today. I will call it a pseudo tornado for now. I may post the HD video later; depending on comments LOL.
This was passing up the severn valley. Had a lot of hail today. Loads of scud associated with this storm, lowering of cloud where the sun was.
This was passing up the severn valley. Had a lot of hail today. Loads of scud associated with this storm, lowering of cloud where the sun was.
#2
Posted 17 March 2012 - 19:10
Could you see any rotation, Chris? Looks like a possible scudsucker.
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N.
#3 Guest_Chris Lloyd_*
Posted 18 March 2012 - 11:54
Nigel Bolton, on 17 March 2012 - 19:10, said:
Could you see any rotation, Chris? Looks like a possible scudsucker.
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Difficult to tell really - it was quite a way away. I was interested just as much in the area where the sun was. A triangular lowering came down and then went back up again. The camera over-exposed it so not so easy to see on the vid.
Enjoyed watching it anyway, even if it was just scud. Plenty of hail around yesterday, so plenty of convection about.
Video link.
#4
Posted 18 March 2012 - 12:50
Hi Chris,
Had a look at the video.
It is definitely NOT a tornado, but the end elevation view of a small gust front.
What you have here is the cloud forming on the leading edge of a downdraft. What is happening, is that a shower on the left of the photo/video has generated a downdraft of cold air, the nose of which is moving from left to right across the field of view. Bearing in mind, that many of your showers, (along with those in other areas) contained hail, the downdraft was significantly colder than the surrounding air.
Thus the nose of the downdraft would have been efficient at scooping up milder and moister air, this air rising to produce the finger of cloud seen. If you look closely, one can see cloud rising along the right hand edge of the finger, but there is definitely no rotation.
Finger effect may have also been augmented by the downdraft being funnelled up a valley.
As an asside, temperature falls of 5 to 7 degrees were recorded in the hail showers across Devon during yesterday afternoon, very typical of Spring showers in cold air, where the sunshine is strong enough to raise temperatures significantly between the showers.
N.
Had a look at the video.
It is definitely NOT a tornado, but the end elevation view of a small gust front.
What you have here is the cloud forming on the leading edge of a downdraft. What is happening, is that a shower on the left of the photo/video has generated a downdraft of cold air, the nose of which is moving from left to right across the field of view. Bearing in mind, that many of your showers, (along with those in other areas) contained hail, the downdraft was significantly colder than the surrounding air.
Thus the nose of the downdraft would have been efficient at scooping up milder and moister air, this air rising to produce the finger of cloud seen. If you look closely, one can see cloud rising along the right hand edge of the finger, but there is definitely no rotation.
Finger effect may have also been augmented by the downdraft being funnelled up a valley.
As an asside, temperature falls of 5 to 7 degrees were recorded in the hail showers across Devon during yesterday afternoon, very typical of Spring showers in cold air, where the sunshine is strong enough to raise temperatures significantly between the showers.
N.
#6
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- Locationportsmouth uk
Posted 19 March 2012 - 15:40
really nice video there , I thought i saw a bit of rotation but I very dout it 
never the less ill see to what the experts say 
never the less ill see to what the experts say
This post has been edited by stormy sam: 19 March 2012 - 15:41
#7
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Posted 19 March 2012 - 15:44
Still a nice dramatic photo though, even if it's not a funnel cloud or tornado 
#8
- Group: Warnings Team
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- LocationSE Cornwall/ Plymouth
Posted 19 March 2012 - 18:58
Nice one Chris, and cheers Nigel for the detailed explaination
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