On Wednesday, July 19, 2017 at 1:02:25 PM UTC+1, Asha Santon wrote:
On 2017-07-18 18:11:55 +0000, Graham Easterling said:

Around 200mm (thanks Bernard) rain fell near Coverack in this
afternoons major thunderstorm. GrahamPenzance


In this article, the Environment Agency syuggests it was half that

http://www.bbc.co.uk/news/uk-england-cornwall-40652594

More than enough in any event.


--
Asha
minnies.opcop.org.uk
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Yes, I think 100mm seems a realistic estimate (for that's what it is) of the rainfall in that general area, and for a fair area just offshore. There was, by local account & some evidence from the high res radar, a small area of exceptionally intense rain/hail, I think just to the north of Coverack, and it is there that totals may have approached 200mm. I hope to track down a possible recording over 160mm+. Sadly, as with most extreme events, we'll probably never actually know, official interest in actually recording the weather is at a depressing all time low.

The EA also said in their report after Boscastle that it was a 1 in 200 years event, despite the river having reached similar levels 3 times in living memory, and on one of those occasions a higher rainfall being recorded in an official gauge than in the 2004 event.

Graham