I've just experienced some of the heaviest rain I have ever seen in this
country. According to the Davis VP 9.6 mm fell in just over 4 minutes
from 1830 BST, with a maximum rate of 236 mm/hour. The rain was
accompanied by one loud clap of thunder.

Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles
England