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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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#1
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I have to say that I'm at a loss as to why the warning for snow and ice
comes into force at precisely 0005 on Friday. Why not at midnight? Surely there is no pretence that forecasting can be so precise. The warning start at 0005 on Friday seems at odds with the current Peak District Forecast for Thursday which says "Turning drier, brighter and colder during the morning with scattered wintry showers, snow showers then becoming heavy and more frequent through the late afternoon and evening. Temporary blizzard conditions and drifting of lying snow later in the day." On the basis of that forecast it would appear that the warning should come into force around 1600-1800 on Thursday, at least for this part of the country. As is so often the case, there seems to be an absence of 'joined-up' forecasting. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr |
#2
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On Wednesday, December 6, 2017 at 7:37:48 PM UTC, Norman Lynagh wrote:
I have to say that I'm at a loss as to why the warning for snow and ice comes into force at precisely 0005 on Friday. Why not at midnight? Surely there is no pretence that forecasting can be so precise. The warning start at 0005 on Friday seems at odds with the current Peak District Forecast for Thursday which says "Turning drier, brighter and colder during the morning with scattered wintry showers, snow showers then becoming heavy and more frequent through the late afternoon and evening. Temporary blizzard conditions and drifting of lying snow later in the day." On the basis of that forecast it would appear that the warning should come into force around 1600-1800 on Thursday, at least for this part of the country. As is so often the case, there seems to be an absence of 'joined-up' forecasting. -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. https://peakdistrictweather.org Twitter: @TideswellWeathr There's the same warning of snow & ice a fair chunk of Cornwall - including the coastal areas, where the forecast looks somewhat different E.g Padstow https://www.metoffice.gov.uk/public/...ate=2017-12-08 Even up at Bodmin, the current forecast is for rain showers rather than snow https://www.metoffice.gov.uk/public/...ate=2017-12-08 I think you'll have to be up near the top of Brown Willy to be in with much chance of seeing lying snow in Cornwall Graham Penzance |
#3
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In article , lynagh@weather-
consultancy.com says... I have to say that I'm at a loss as to why the warning for snow and ice comes into force at precisely 0005 on Friday. Why not at midnight? Because some people have difficulty understanding it. 00h00 on Friday mean midnight between Thursday and Friday or between Friday and Saturday. -- Alan LeHun |
#4
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At least through the 1980s the convention at the Met Office was to label midnight as 00:01 Z.
Stephen. |
#5
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I think, technically, 0000 doesn’t exist. It’s either 2359 denoting the end of the day and 0001 the start of the next.
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#6
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On 07/12/2017 20:22, Stephen Davenport wrote:
At least through the 1980s the convention at the Met Office was to label midnight as 00:01 Z. Stephen. NTSLF cant even get the top of each hour right. eg http://www.ntslf.org/data/realtime?port=Portsmouth come relaying the tidegauge readings for say 22:00 tonight , their www clock will say 21:60 |
#7
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In message , N_Cook
writes On 07/12/2017 20:22, Stephen Davenport wrote: At least through the 1980s the convention at the Met Office was to label midnight as 00:01 Z. Stephen. NTSLF cant even get the top of each hour right. eg http://www.ntslf.org/data/realtime?port=Portsmouth come relaying the tidegauge readings for say 22:00 tonight , their www clock will say 21:60 Good grief! If they can't even get that right, what confidence can one have that they are reporting the gauge readings correctly? -- John Hall "George the Third Ought never to have occurred. One can only wonder At so grotesque a blunder." E.C.Bentley (1875-1956) |
#8
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0000 does exist. It's 2400 that doesn't. But to remove doubt about what day is meant, 0001 or 2359 are used.
-- Freddie |
#9
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On 07/12/2017 22:01, John Hall wrote:
In message , N_Cook writes On 07/12/2017 20:22, Stephen Davenport wrote: At least through the 1980s the convention at the Met Office was to label midnight as 00:01 Z. Stephen. NTSLF cant even get the top of each hour right. eg http://www.ntslf.org/data/realtime?port=Portsmouth come relaying the tidegauge readings for say 22:00 tonight , their www clock will say 21:60 Good grief! If they can't even get that right, what confidence can one have that they are reporting the gauge readings correctly? Its been like that since they started, this morning I just checked and 08:00 was 07:60. Of more concern is the so often repeated crapping out of the tide gauges just when you need them, at the onset of a surge. Bubbler gauges were supposed to be immune from the weather effects on float types. From a top oceanographer, that crapouting is due to problems in the software/firmware, or even rapid air pressure changes from the compensator sensor. The bubbler system works fine throughout apparently. He did not go into detail, but its probably due to waves from the storm usually associated with a surge, inducing high frequency pressure changes, that the firmware interprets as interference and dumps the data, recording nulls . |
#10
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On Thursday, December 7, 2017 at 10:04:38 PM UTC, John Hall wrote:
In message , N_Cook writes On 07/12/2017 20:22, Stephen Davenport wrote: At least through the 1980s the convention at the Met Office was to label midnight as 00:01 Z. Stephen. NTSLF cant even get the top of each hour right. eg http://www.ntslf.org/data/realtime?port=Portsmouth come relaying the tidegauge readings for say 22:00 tonight , their www clock will say 21:60 Good grief! If they can't even get that right, what confidence can one have that they are reporting the gauge readings correctly? -- John Hall "George the Third Ought never to have occurred. One can only wonder At so grotesque a blunder." E.C.Bentley (1875-1956) For sea conditions I rather like this site - http://www.channelcoast.org/data_man...e_data/charts/ Click the site name and you get this (in the case of Perranporth) http://www.channelcoast.org/data_man...arts/?chart=76 As you can see, whilst the significant wave height (the figure normally quotes) is now around 4m, the peak wave height is now 7m - quite large, but note how short the period is, so not powerful, just a typical rough sea. In Cornwall, away from the estuaries, it's wave height/period & wave setup surges which are normally the most important, rather than the tide being 0.3m above astronomical predictions. You also get SST, wave direction & full data on the wave spectra http://www.channelcoast.org/data_man...a&disp_option= It's really rather good, pointed out to me by Nick G originally, if I remember rightly. Anyway, as northerly blasts go, pretty half hearted here, still around 6C. Graham Penzance |
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