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Effect of time change on Cumulus Data

Discussion in 'Technical, Reviews & Website Design' started by Nimbus, Oct 30, 2011.

  1. Nimbus Fresh Breeze

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    The data on Cumulus seems to have been corrupted somewhat by the time change at 01:00.
    The main effect seems to have been the logging of a new record rainfall rate of 20725mm/hr,
    Although the actual amount of rainfall recorded was only 3.9mm.
    The temperature and wind speed records seem to have been affected as well, but I don't
    think the min/max figures will be invalidated.
    Anybody else noticed anything similar?
  2. Thunderstorm Super Administrator

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    Everything changed over fine here Nimbus...
  3. Nimbus Fresh Breeze

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    Strange, I wonder if it is something to do with the operating system.
    Did the time on your PC change automatically or did you have to do it manually?
  4. Thunderstorm Super Administrator

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    Mine changed automatically.
  5. beteljuice [MVP] Applications

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    Check your Oct log, you may have several entries for the same time(s) [an hours worth], because the clocks went back.
    Presumeably it's also affected your "Today" figures and "All Time" figures ?
  6. Nimbus Fresh Breeze

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    The "today" figure does seem to have been affected, but only recording 3.6mm, after 01:00, which is probably wrong but not as
    much as I would have expected from an all time figure of 20725mm/hr.
    When I look at the Oct Log file, it appears that the period 01:00 to 01:50 is repeated.
    The first time, 0.9mm was recorded and the second time, 3.6mm was recorded (although that might include the first 0.9mm).
    Another 0.3mm was recorded at 05:50, which I assume was genuine.
    I attach some copies of screen dumps of the rainfall and temperature graphs, and it is clear that there has been multiple recording of
    data.

    Attached Files:

  7. Straw walker Moderator

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    I think that is normal Nimbus because you have 2 sets of overlapping data. One from 01:00 to 02:00 'old time' and the same data for that period 'new' time. If you look at your wind speed and pressure graphs, you'll probably see a thick band of results for the same period. Your 0.9mm was old time and the 3.6mm new time. The high rate was also probably caused by the overlap.
  8. Nimbus Fresh Breeze

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    Thanks for that.
    The only problem is, that nobody else's data seems to have been affected in the same way (so far).
  9. beteljuice [MVP] Applications

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    Not true - check out the Cumulus forum.

    It was probably more obvious for you because of the rain. It also shows that your PC was running and your wx reporting 'live' during the time change.

    If Cumulus had been off for the (two) hours affected, it would simply have back tracked from the station logger and effectively 'lost' an hour.
  10. Nimbus Fresh Breeze

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    Sorry, I based what I said on responses to my post.
    If I remember, I will turn my computer off next year.
    It wasn't just Cumulus which got confused.
    My not inexpensive Humax hard drive recorder recorded everything an hour late yesterday!