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Old 20-07-2017, 12:58 PM posted to uk.rec.gardening
James Wilkinson Sword[_2_] James Wilkinson Sword[_2_] is offline
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First recorded activity by GardenBanter: Jan 2017
Posts: 37
Default "% Chance of rain"

On Thu, 20 Jul 2017 12:44:54 +0100, Asha Santon wrote:

On 2017-07-20 11:13:43 +0000, James Wilkinson Sword said:

What do you believe weather forecasters mean when they say "40% chance
of rain"?

1) It will rain for 40% of the day.
2) There's a 40% chance it will rain at some point.

I googled it and apparently it depends on the forecaster? 1) and 2)
are completely different meanings.


It means there is a 40% chance that it will rain in the area to which
the forecast applies and during the period (often a day) specified.

It never means (1) and does not depend on the forecaster and is not a
matter of belief. Nor, happily, does it depend on google.


So it's utterly useless then? 40% chance of rain could mean there's a 40% chance I'll get a light shower for half an hour at some point, or it could mean there's a 40% chance it will bucket down all day. They should estimate the AMOUNT of rain that is going to fall, eg so many mm.

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