On 10/03/2021 19:23, Metman2012 wrote:
On 10/03/2021 18:09, N_Cook wrote:
In the local record maximum rain rate as 530mm/hour (sic 0.53m/hr)
00:15 27 Dec 2020 for a short duration. The owner , an ex metman ,
cannot confirm it as genuine or not, but looks iffy. Later a short
burst of 340mm/hr, overall 23mm in 6 hours. Could they be genuine
extreme rain-rate records?
If genuine it would explain why the local storm drain flap valve into
the local tidal river has been fully open , unnoticed, for a few
months. Flap nearly vertical, self weight holding it 20 degrees off
vertical , backwards beyond vertical, against the hinge joint.
It was realised there was a problem because the lowest road drain
water traps had the level going up and down exactly with the highest
tides.

The first question is, how were they measured? We had a number of
different recording rain gauges when I worked at Kew Observatory in the
late 60s. We measured over 150mm per hour on a few occasions. But then
that was a Jardi rate of rain recorder which had a 6 foot radius
collector. I don't think any amateur AWS is likely to be able to cope
with that sort of intensity. I think it an unlikely event. Can you find
out what the rainfall radar was showing at that time?

From previous experience of definite heavy rainfall locally, the radar
image showed nothing abnormal, apperently because we have some high
ground between us and the Chilbolton radar station, in radar shadow.


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Global sea level rise to 2100 from curve-fitted existing altimetry data
http://diverse.4mg.com/slr.htm