On Friday, 17 April 2015 17:39:15 UTC+1, Graham P Davis wrote:
On Fri, 17 Apr 2015 09:26:43 -0700 (PDT)
Tudor Hughes wrote:

On Thursday, 16 April 2015 18:16:01 UTC+1, Graham P Davis wrote:
Picture of beautiful K-H clouds over Essex.

http://www.bbc.co.uk/weather/feature...e=news_central
Spotted this when it was tweeted by Steph Ball a few minutes ago.


Nice, but I strongly suspect a hoax. The conditions for K-H
waves are simply not there. The Herstmonceux ascent for 12Z 15th
April shows very little wind shear. Also, the humdity is too low.

http://weather.uwyo.edu/cgi-bin/soun...512&STNM=03882

Tudor Hughes, Warlingham, Surrey.


You think the 20kt shear in the moist layer at 350hPa is insufficient?

--
Graham P Davis, Bracknell, Berks. [Retd meteorologist/programmer]
http://www.scarlet-jade.com/
I wear the cheese. It does not wear me.
Posted with Claws: http://www.claws-mail.org/

No, not in itself but these clouds are not at 350 mb, which is about 28000 ft. From their texture I'd say they were at less than half that. Also, the camera angle is low and if they were at 28000 ft they would have to be at a vast distance and they certainly don't give that impression. There was a lot of haze that day but at cloud level there looks to be very little. There is no serious wind shear below 350 mb. Intriguing, but I'm highly suspicious.

Tudor Hughes, Warlingham, Surrey.