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  1. #1
    Jcschmid2's Avatar
    Jcschmid2 Guest

    Default Accuracy of clear sky clocks?



    I was wondering how accurate the clear sky clocks are as far as cloud cover,
    seeing, and transparancy within 24 hours. They seem to be better than NWS
    forecasts sometimes, though.

    Chris

  2. #2
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default Accuracy of clear sky clocks?

    On 22 Feb 2004 19:25:05 GMT, jcschmid2@aol.com (Jcschmid2) wrote:


    Here in central Colorado they are remarkably accurate. I can usually trust their
    prediction.

    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  3. #3
    Tdcarls's Avatar
    Tdcarls Guest

    Default Accuracy of clear sky clocks?

    I find them very accurate. Often the clouds start to arrive or disappear
    within 30 minutes of the predicted CSC time.

    What baffles me is if the CSC program gets its data from gov't weather
    services, how come the gov't weather services can't be this accurate???!!!


    Todd




  4. #4
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default Accuracy of clear sky clocks?

    On 22 Feb 2004 20:04:22 GMT, tdcarls@aol.com (Tdcarls) wrote:


    Well, they are largely predicting the conditions only a day ahead, and as used,
    often only a few hours. Conventional weather forecasts are generally accurate
    over that same period.

    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  5. #5
    Hilton Evans's Avatar
    Hilton Evans Guest

    Default Accuracy of clear sky clocks?

    "Jcschmid2" <jcschmid2@aol.com> wrote in message news:20040222142505.09343.00000166@mb-m12.aol.com...

    My experience, albeit non quantitative, is they are quite
    accurate; especially if used within their limitations. It's also
    a good idea to flesh out your personal forcast with additional
    data and looking out the window ;-).


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  6. #6
    Hilton Evans's Avatar
    Hilton Evans Guest

    Default Accuracy of clear sky clocks?


    "Tdcarls" <tdcarls@aol.com> wrote in message news:20040222150422.12186.00000219@mb-m02.aol.com...

    Are you talking about cloud cover and transparency or are you
    talking about the general public forecast including precipitation,
    temperature, winds, clouds, etc? The CSC forecast is a limited
    experimental forecast giving 48 hours notice. What gov't forecast
    are you comparing it to?


    --
    Hilton Evans
    ---------------------------------------------------------------
    Lon -71° 04' 35.3"
    Lat +42° 11' 06.7"
    ---------------------------------------------------------------
    CCD Astroimaging
    http://home.earthlink.net/~hiltoneva...troimaging.htm
    ---------------------------------------------------------------
    ChemPen Chemical Structure Software
    http://www.chempensoftware.com




    ---
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  7. #7
    Tdcarls's Avatar
    Tdcarls Guest

    Default Accuracy of clear sky clocks?

    <<<Are you talking about cloud cover and transparency or are you
    talking about the general public forecast including precipitation,
    temperature, winds, clouds, etc? The CSC forecast is a limited
    experimental forecast giving 48 hours notice. What gov't forecast
    are you comparing it to?>>>

    Why would I be thinking precipitation or wind when discussing the accuracy of
    the CSC?

    Many times I've told my wife that "it'll be clear tomorrow by 2:00 p.m." and it
    is. I often use the CSC when I plan on golfing the next day to see the amount
    of cloud cover during the round.

    The typical "partially cloudy" that the weather agencies use to describe the
    upcoming conditions just doesn't cut it as compared to the CSC.


    Todd




  8. #8
    Thad Floryan's Avatar
    Thad Floryan Guest

    Default Accuracy of clear sky clocks?

    Chris L Peterson <clp@alumni.caltech.edu> wrote in message news:<lg2i309u06epl3u2061utlalccqsoc5dkb@4ax.com>. ..

    Yet here in Silicon Valley I've often noted the update latency (of the CSC)
    can be misleading due to all the microclimates. For example, there are times
    the CSC indicates total cloud cover yet the skies from my backyard will be
    crystal clear (and vice versa). What I do is examine the CSCs bracketing my
    area out to about 30-40 miles to get a feeling for trends, and this often is
    quite effective.

    The CSC is a fantastic resource, but one should factor-in information from
    other sources, too, before trekking a long distance to a viewing site. Some
    people augment the CSC info with jet stream data whereas I use the clear air
    turbulence data at:

    <http://orbit35i.nesdis.noaa.gov/arad/fpdt/tifcsts.html>

    and the cloud data at:

    <http://wwwghcc.msfc.nasa.gov/ghcc_home.html>

  9. #9
    Jim Booth's Avatar
    Jim Booth Guest

    Default Accuracy of clear sky clocks?

    I find its accuracy nothing short of amazing. However, I do use the latest
    satellite enhanced IR image at night also. By watching the movement of the
    cloud patterns on the time lapsed satellite image (over say a 3 hour
    period), you can tell whether or not it's worth the effort to set up that
    evening. I started using the satellite because I found that even though the
    sky clock would be accurate from a seeing perspective, it wasn't always for
    cirrus and other high altitude clouds and that's where the satellite view
    comes in handy. Moreover, there are times when seeing is best when cirrus
    clouds ARE present as long as they don't obscure your view. With a good
    satellite time lapsed view that is zoomed in to your area, you can actually
    become quite accustomed to predicting when and where clouds will pass over
    your area. I've been able to do this with fair accuracy within a 30 minute
    period.

    Jim


    "Jcschmid2" <jcschmid2@aol.com> wrote in message
    news:20040222142505.09343.00000166@mb-m12.aol.com...
    cover,



  10. #10
    Allison Kirkpatrick's Avatar
    Allison Kirkpatrick Guest

    Default Accuracy of clear sky clocks?

    jcschmid2@aol.com (Jcschmid2) wrote in message news:<20040222142505.09343.00000166@mb-m12.aol.com>...

    I've found them to be remarkably inaccurate, and I am surprised that
    so many people seem to think so highly of them. Sorry to sound so
    negative.

 

 
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