On Jun 6, 1:29*am, Tudor Hughes wrote:
On Jun 5, 8:00*pm, "Will Hand" wrote:





"Paul Hyett" wrote in message

...

On Sun, 5 Jun 2011 at 16:21:31, Will Hand
wrote in uk.sci.weather :

"Hugh Newbury" wrote in message
...

Only 0.6mm here today. I didn't bother watering this morning because I
was *expecting a decent amount.

Well I did say not to expect too much in the already dry areas as the dry
ground would not provide enough moisture!

I always thought rain usually fell from the *sky*...
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

As I said the other day, in order to get substantial showers (in the absence
of upper forcing) you need a moisture supply from low down. A bone dry
ground mitigates against showers, doesn't stop them, although in very arid
deserts it does where convection is of the dry thermal type.

Will
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* * *In the last 8 hours about 21 mm has fallen on bone-dry brown-
grassed north-east Surrey. *This forces me to conclude that the
moisture is of non-Surrey origin as it nearly always is when it rains
here. *I suspect a large part of it comes from evaporation of the
oceans and that the hydrological cycle is on rather larger a scale
than has been suggested, but who knows?

Tudor Hughes, Warlingham, Surrey.- Hide quoted text -

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You know, I've been thinking that advection could play a small part as
well. Still, who are we to question............