|
Why only a trace?
Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying.
Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. |
Why only a trace?
On Thursday, March 1, 2018 at 9:57:57 AM UTC, wrote:
Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying. Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. It's because humans are now largely redundant in the system. That's progress! Graham Penzance |
Why only a trace?
Graham Easterling wrote:
On Thursday, March 1, 2018 at 9:57:57 AM UTC, wrote: Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying. Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. It's because humans are now largely redundant in the system. That's progress! Graham Penzance Even a manual rain gauge is of no use in the sort of conditions we have here this morning. The funnel fills to the brim with falling snow and drifting snow then anything further just blows off. There's no 'level' snow from which to calculate a probable rainfall equivalent. This morning I simply gave a sensible estimate based on the amount of precipitation that I observed. It might be an accurate estimate or it may not but it's the best I can do. The last tip of the AWS bucket was at 1540z on 27th Feb. Some sunshine that afternoon had caused a little melting of the snow in the funnel. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr |
Why only a trace?
|
Why only a trace?
On Thursday, March 1, 2018 at 10:21:42 AM UTC, Norman Lynagh wrote:
Graham Easterling wrote: On Thursday, March 1, 2018 at 9:57:57 AM UTC, wrote: Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying. Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. It's because humans are now largely redundant in the system. That's progress! Graham Penzance Even a manual rain gauge is of no use in the sort of conditions we have here this morning. The funnel fills to the brim with falling snow and drifting snow then anything further just blows off. There's no 'level' snow from which to calculate a probable rainfall equivalent. This morning I simply gave a sensible estimate based on the amount of precipitation that I observed. It might be an accurate estimate or it may not but it's the best I can do. The last tip of the AWS bucket was at 1540z on 27th Feb. Some sunshine that afternoon had caused a little melting of the snow in the funnel. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr Yes, the problem with yesterdays snow was that it can in very heavy bursts, which filled the funnel, then strong 30mph gusts blew it out again. It's not a problem I normally come up against! Even when it does snow here it's normally wet & sticky. I suppose 1 way is to extract an area of snow, of a typical depth, with the diameter of the rain gauge, and melt it? Graham Penzance |
Why only a trace?
On Thursday, March 1, 2018 at 10:21:42 AM UTC, Norman Lynagh wrote:
Graham Easterling wrote: On Thursday, March 1, 2018 at 9:57:57 AM UTC, wrote: Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying. Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. It's because humans are now largely redundant in the system. That's progress! Graham Penzance Even a manual rain gauge is of no use in the sort of conditions we have here this morning. The funnel fills to the brim with falling snow and drifting snow then anything further just blows off. There's no 'level' snow from which to calculate a probable rainfall equivalent. This morning I simply gave a sensible estimate based on the amount of precipitation that I observed. It might be an accurate estimate or it may not but it's the best I can do. The last tip of the AWS bucket was at 1540z on 27th Feb. Some sunshine that afternoon had caused a little melting of the snow in the funnel. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr -------------------------------------------------------------------- I had 2.6 mm in my 5 inch funnel when I melted the snow yesterday. Difficult to judge level snow but it was at least 10 cm in my garden which could equate with about 8 mm. (1 foot snow=1 inch rain in old money). Today has been hopeless with the gale force wind. Very little in the funnel. So measuring precipitation in these conditions is really a busted flush. Len Wembury, SW Devon |
Why only a trace?
Graham Easterling wrote:
On Thursday, March 1, 2018 at 10:21:42 AM UTC, Norman Lynagh wrote: Graham Easterling wrote: On Thursday, March 1, 2018 at 9:57:57 AM UTC, wrote: Why is seemingly the whole country reporting only a trace of rainfall, or even none at all? I had 7.1mm in the 24 hours to 0900 this morning, with 13cm of snow lying. Ian Bingham, Inchmarlo, Aberdeenshire. 80m asl. It's because humans are now largely redundant in the system. That's progress! Graham Penzance Even a manual rain gauge is of no use in the sort of conditions we have here this morning. The funnel fills to the brim with falling snow and drifting snow then anything further just blows off. There's no 'level' snow from which to calculate a probable rainfall equivalent. This morning I simply gave a sensible estimate based on the amount of precipitation that I observed. It might be an accurate estimate or it may not but it's the best I can do. The last tip of the AWS bucket was at 1540z on 27th Feb. Some sunshine that afternoon had caused a little melting of the snow in the funnel. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr Yes, the problem with yesterdays snow was that it can in very heavy bursts, which filled the funnel, then strong 30mph gusts blew it out again. It's not a problem I normally come up against! Even when it does snow here it's normally wet & sticky. I suppose 1 way is to extract an area of snow, of a typical depth, with the diameter of the rain gauge, and melt it? Graham Penzance Yes, that's the theory. You plunge the inverted funnel into the snow and melt what is collected. However, that only works if there is level snow. Here, we've had dry, powder snow and strong winds. Surfaces exposed to the wind are blown almost clear while shelterd spots have a large accumulation of snow. Nowhere is there a representative 'level depth'. I think a 'sensible estimate' is the best solution. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr |
| All times are GMT. The time now is 03:04 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2006 WeatherBanter.co.uk