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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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On 30/07/2017 16:41, Dave Ludlow wrote:
Last night here in west Fareham we had two non-thundery torrential downpours as the rain area crossed between 00:30 and 02:00 BST. The first lasted 40 minutes and peaked at ~45mm/hour at 00:45 then tailed off to stop briefly before resuming at 01:30. The second downpour ended about 02:10 BST and peaked for a minute or two at 100 mm/hour at 01:40 BST, roof gutters overflowed and it looked and sounded as torrential as a thunderstorm would produce (no hail though). The above is from my VP2 bucket tips but I did empty the rain gauge at 3 am and 21mm fell in those two 40 minute periods, just over half in the second burst. However... None of this was apparent on the (Netweather) 5 minute 500m rainfall radar before, during or after the rain. The maximum rate shown for here was (is still) ~8 mm/hour and the radar 24 hour total currently for my location and nearby stands at ~10 mm (true total is ~24mm). I assume that the heaviest part of the downpours were too brief to register on radar - can anyone tell me if this is a common problem, as I haven't noticed it occurring to this extent previously. Or is it likely to be a rainfall radar calibration issue? St Denys, Soton, 1625 this afternoon ,intense rainfall peaking at 180mm/hr, 4mm in no more than 5 minutes, but nothing on the radar, no pixel of any shade anywhere near. Again too small a scale presumably. |
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