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Question How do they forecast Visibility conditions?

Discussion in 'Alpine & Southern' started by Arsas, Jun 19, 2018.

  1. Arsas

    Arsas One of Us

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    Just wondering how the websites forecast the visibility conditions for resorts? Is it based on the amount of clouds and what height they are at? or is there more to it?
     
  2. POW_hungry

    POW_hungry Part of the Furniture Moderator Ski Pass: Gold

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    Nailed it.
    Cloud ceiling Vs. terrain height. Often only really reliable 1 MAYBE 2 days out in periods of 'changing conditions'.
    Differing levels of humidity/wet bulb temps will determine cloud/fog density etc.
     
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  3. skifree

    skifree grey Moderator Ski Pass: Gold

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    By looking out the window.
     
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  4. nfip

    nfip Part of the Furniture Ski Pass: Gold

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    no.
    that would be an observation. ;)
     
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  5. POW_hungry

    POW_hungry Part of the Furniture Moderator Ski Pass: Gold

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    On a general scale YrNo/EC's 'detailed' meteogram does a pretty good job at progging cloud cover, but won't give you much in terms of vis.


    I personally find looking at progged skew-t the easiest in determining cloud cover, fog layers etc. Again only really useful on a mesoscale level at 1 maybe 2 days out.
     
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  6. skifree

    skifree grey Moderator Ski Pass: Gold

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    True, but the observation gives you the starting parameters to then make a guess or later issue a confirmation of the forecast.

    Tho pretty often it’s clear some body did not look out the window.
     
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  7. Richard

    Richard Maintenance Dept Administrator

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    “Conditions can change so quickly in the mountains”
     
  8. nfip

    nfip Part of the Furniture Ski Pass: Gold

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    Yup.
    and I was just being a smart arse , well , just to be a smart arse .
    hence the wink.
     
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  9. Richard

    Richard Maintenance Dept Administrator

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    Imo, visibility forecasts are the least reliable of all the resort specific condition forecasts.

    There is basically no substitute for a report from the hill in the morning, from an experienced local reporter. Knowing the diff between an early fog that will burn off and cloud cover that will hang all day takes weather understanding and local knowledge.
     
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  10. nfip

    nfip Part of the Furniture Ski Pass: Gold

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    Always amazes me how it can be a complete white-out blizz up at resort level then blue skies by the time you get to say island bend or wilsons valley.
     
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  11. skifree

    skifree grey Moderator Ski Pass: Gold

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    It was a good question/ point even with a wink.;):thumbs:
     
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  12. POW_hungry

    POW_hungry Part of the Furniture Moderator Ski Pass: Gold

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    Yep, it’s mesoscale stuff.
    So many local variables and influences you need to know your stuff. You won’t find any reliable sources beyond 2 days. That said, where weather is stable (under the influence of a High), you can get a good grasp on stuff 2-3 days out, if you can pick that High.
     
  13. nfip

    nfip Part of the Furniture Ski Pass: Gold

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  14. Seafm

    Seafm Too far from the snow Ski Pass: Gold

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    Paging @Normo ;)
     
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  15. The Plowking

    The Plowking Part of the Furniture Ski Pass: Gold

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    Best days are the worst days visibility wise. Just saying.