The last dollop of torrential rain has produced a rate of 700 mm/h
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm

12 mm fell in a 10 minute period according to AWS.

Measured rainfall for today is now over 75 mm.
Still raining (much lighter at 1935).

Can 700 mm/h be correct, surely a malfunction due to the tipping bucket
mechanism being overwhelmed?
Mind you I have never seen such sustained rainfall intensity as has fallen
in the past hour here, it really was very very heavy.

Will (Haytor, Devon, 1017 feet asl)
--

On 05/08/12 19:42, Dartmoor Will wrote:
The last dollop of torrential rain has produced a rate of 700 mm/h
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm

12 mm fell in a 10 minute period according to AWS.

Measured rainfall for today is now over 75 mm.
Still raining (much lighter at 1935).

Can 700 mm/h be correct, surely a malfunction due to the tipping bucket
mechanism being overwhelmed?
Mind you I have never seen such sustained rainfall intensity as has
fallen in the past hour here, it really was very very heavy.

I have found the AWS just stops when it is overwhelmed, often in a
horizontal position. It will be interesting to see how much your std
gauge produces when you empty it next.

Meanwhile we haven't had a drop here today 9-9z.

Hugh

--

Hugh Newbury

www.evershot-weather.org

"Dartmoor Will" wrote in message
...
Can 700 mm/h be correct, surely a malfunction due to the tipping bucket
mechanism being overwhelmed?

Well, certainly unlikely to be accurate at such extreme rain rates, but all
it means when you work it out (and for a 0.2mm TBR) is that two successive
tips were recorded about 1 second apart - close to the reality check limit
for a VP2 I suspect. (Though actually now I come to check it, the spec says
the max rain rate is 2438mm/hr - probably a conversion from 96"/hr ). I
wonder if, transiently, the rain was falling into the collector faster than
it could pass through the central hole and hence triggering two tips in very
quick succession. In other words, perhaps at seriously extreme rain rates
the limiting factor becomes the rate at which rain can exit through the
orifice because I'm pretty sure that the buckets can tip a bit more quickly
than every second.

JGD

"johnd" wrote in message
...

"Dartmoor Will" wrote in message
...
Can 700 mm/h be correct, surely a malfunction due to the tipping bucket
mechanism being overwhelmed?

Well, certainly unlikely to be accurate at such extreme rain rates, but
all it means when you work it out (and for a 0.2mm TBR) is that two
successive tips were recorded about 1 second apart - close to the reality
check limit for a VP2 I suspect. (Though actually now I come to check it,
the spec says the max rain rate is 2438mm/hr - probably a conversion from
96"/hr ). I wonder if, transiently, the rain was falling into the
collector faster than it could pass through the central hole and hence
triggering two tips in very quick succession. In other words, perhaps at
seriously extreme rain rates the limiting factor becomes the rate at which
rain can exit through the orifice because I'm pretty sure that the buckets
can tip a bit more quickly than every second.

JGD

Thanks John that makes sense.
Certainly for a few minutes the rain was awesome. Large drops and many many
of them (like drizzle) which is an unusual density. The air was full of
water and I could not make out any cloud forms at all. I have never seen
such rain intensity, not even in thunderstorms. No doubt it occurs regularly
in the tropics and my son who has been to Sri Lanka said such rains were
fairly typical there.

What a day!
All drying up now.

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------

On 05/08/2012 22:50, Dartmoor Will wrote:


Thanks John that makes sense.
Certainly for a few minutes the rain was awesome. Large drops and many
many of them (like drizzle) which is an unusual density. The air was
full of water and I could not make out any cloud forms at all. I have
never seen such rain intensity, not even in thunderstorms. No doubt it
occurs regularly in the tropics and my son who has been to Sri Lanka
said such rains were fairly typical there.

What a day!
All drying up now.

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------


Dartmoor Will?

Eskimo Will?

Monsoon Will?

jim, Northampton

On Aug 5, 10:50*pm, "Dartmoor Will" wrote:
"johnd" wrote in message

...











"Dartmoor Will" wrote in message
...
Can 700 mm/h be correct, surely a malfunction due to the tipping bucket
mechanism being overwhelmed?

Well, certainly unlikely to be accurate at such extreme rain rates, but
all it means when you work it out (and for a 0.2mm TBR) is that two
successive tips were recorded about 1 second apart - close to the reality
check limit for a VP2 I suspect. (Though actually now I come to check it,
the spec says the max rain rate is 2438mm/hr - probably a conversion from
96"/hr ). I wonder if, transiently, the rain was falling into the
collector faster than it could pass through the central hole and hence
triggering two tips in very quick succession. In other words, perhaps at
seriously extreme rain rates the limiting factor becomes the rate at which
rain can exit through the orifice because I'm pretty sure that the buckets
can tip a bit more quickly than every second.

JGD

Thanks John that makes sense.
Certainly for a few minutes the rain was awesome. Large drops and many many
of them (like drizzle) which is an unusual density. The air was full of
water and I could not make out any cloud forms at all. I have never seen
such rain intensity, not even in thunderstorms. No doubt it occurs regularly
in the tropics and my son who has been to Sri Lanka said such rains were
fairly typical there.

So how do weather stations function in tropical climes?

On Aug 6, 12:05*am, jbm wrote:

Dartmoor Will Eskimo Will Monsoon Will Superannuated Will Last will Will?

On Sunday, August 5, 2012 7:42:10 PM UTC+1, wrote:
The last dollop of torrential rain has produced a rate of 700 mm/h

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm



12 mm fell in a 10 minute period according to AWS.



Measured rainfall for today is now over 75 mm.

Still raining (much lighter at 1935).



Can 700 mm/h be correct, surely a malfunction due to the tipping bucket

mechanism being overwhelmed?

Mind you I have never seen such sustained rainfall intensity as has fallen

in the past hour here, it really was very very heavy.



Will (Haytor, Devon, 1017 feet asl)

--
Hi Will,
Down here in Ilsington it was getting pretty serious as the road was awash and I was pretty concerned we were going to get flooded. A few years a go a special gulley was built outside our house and it certainly saved us from a flood. Yes it was amazing and like you have never seen anything quite like it in this country. The last time I saw anything like this was in Bangkok..

"Ilsington" wrote in message
...
On Sunday, August 5, 2012 7:42:10 PM UTC+1,
wrote:
The last dollop of torrential rain has produced a rate of 700 mm/h

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm



12 mm fell in a 10 minute period according to AWS.



Measured rainfall for today is now over 75 mm.

Still raining (much lighter at 1935).



Can 700 mm/h be correct, surely a malfunction due to the tipping bucket

mechanism being overwhelmed?

Mind you I have never seen such sustained rainfall intensity as has fallen

in the past hour here, it really was very very heavy.



Will (Haytor, Devon, 1017 feet asl)

--
Hi Will,
Down here in Ilsington it was getting pretty serious as the road was awash
and I was pretty concerned we were going to get flooded. A few years a go a
special gulley was built outside our house and it certainly saved us from a
flood. Yes it was amazing and like you have never seen anything quite like
it in this country. The last time I saw anything like this was in Bangkok.
===================

Cheers Pete. I'm glad you can confirm it was something really special.
Do you have any idea what the precipitable water content was in the high
res. models?
If it was only in the 30s of mm then it was a highly efficient convective
cell. Especially as there was no thunder (which is rare here on Dartmoor
anyway).

What an exciting start to my retirement!!!
Glad you are OK, my veg. patch is bedraggled but plants are still in the
ground, although battered, so not as bad as I first thought. Nothing I can
do about the gutters overflowing, our rainwater soaks away downhill
underground, but in recent weeks the water table has come up and last
evening's tropical deluge overwhelmed it.

Will
--

Will
--

Will
--
--
http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------

"Weatherlawyer" wrote in message
...
On Aug 6, 12:05 am, jbm wrote:

Dartmoor Will Eskimo Will Monsoon Will Superannuated Will Last
will Will?

Yes I'm closer to death than birth but I really don't care, I'm fit, well
and enjoying life and the moment, ...... life is for living not dreaming.

Cheers,
Will
--