On Friday, 27 November 2015 11:44:22 UTC, Metman2012 wrote:
On 27/11/2015 10:16, Eskimo Will wrote:

"Dave Cornwell"
On 27/11/2015 07:21, Bob Martin wrote:
Rain radar shows no rain within 100 miles of me in South Hants
yet we've had 1.6 mm in the last hour.

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Normally brilliant - today rubbish would be my reply! I've just given
a friend a forecast for Sevenoaks in Kent where he is playing golf
today, saying dry. Imagine my shock when I looked out of the window
and saw puddles on my flat roof. Checked the radar - nothing at all.
On high res some very light small patches around your area but nothing
in Essex or Kent!
Dave, S.Essex

The radar is to be used with caution on Dartmoor. Always misses soaking
heavy drizzle which can give several mm in the gauge and sometimes
overdoes convective rainfall.

Will
See http://www.metoffice.gov.uk/news/in-depth/radar. Drizzle isn't
picked up by radar.

There's more info on
http://www.metoffice.gov.uk/learning...rainfall-radar.

The Met O is upgrading their radar network but whether this includes
drizzle I don't know. There used to be a very good page describing the
strengths and weaknesses of weather radar but I can't find it at the moment.

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Met Office Fact sheet No.15:

'Radars under-estimate the rain from clouds composed of smaller-than-average
drops (e.g. drizzle), .......'


http://www.metoffice.gov.uk/media/pd...m=auto,-47,842


Len
Wembury, SW Devon

in patchy heavy drizzle 1230 GMT. Small patchy blue echoes on radar.

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