I hear this has been associated with a tornado or at least tornado type damage at Daventry-M1 and
into Northants.
The 1646 NOAA pass from Bernard Burton's site-
http://www.btinternet.com/~wokingham...1646-b-uk.html
shows some interesting features esp after a little processing-
overshooting tops with the upper winds streaming around them to form the anvil with an upstream bow
'shock',there even appears to be a 'wake ' feature directly behind the core(s).Radar image from 1630
shows an intense core near the apex of a "V"like ppn structure.
I wonder if there was HP supercell embedded here?Apparently the the Daventry damage occured soon
after 16Z,
--
regards,
david
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