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Old July 29th 06, 01:56 PM posted to uk.sci.weather
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Default Unstable, sheared Cirrus first-light Saturday

Bracknell, Berkshire.

Got up first thing this morning (Saturday / 29th July 2006 .. 0500Z),
and saw this cirrus variant towards sunrise horizon: the photograph
doesn't really do justice to the highly contorted sheaves of ice
crystals, made doubly dramatic by being back-lit by the sun on the
horizon. (Have slightly raised the 'blue' content of the picture from
that captured by the camera.)

http://makeashorterlink.com/?Z56921B7D

Nearest applicable ascent (not nearest physical ascent) that I can find
would be Watnall: shear of direction (and a little speed), between 300
hPa & 250hPa, with the base of a moist layer in the same 'zone'. Not
sure if this is the 'perfect' match for the conditions seen, but
certainly supports high-level, ice-crystal instability.

http://makeashorterlink.com/?L15963B7D

Martin.



--
Martin Rowley: data via -
http://homepage.ntlworld.com/booty.weather/metindex.htm
Bracknell (Wooden Hill/Tawfield), Berkshire
NGR: SU 854 667 Elev: 80m
Lat: 51DEG23MIN30SEC(N): Long: 00DEG46MIN28SEC(W)



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