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Thread: Windchill Calculator

  1. #1
    Honey Badger Semper_Fi's Avatar
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    Windchill Calculator

    Road yesterday and it was brisk, comfortable but brisk.

    Anyway found this link for Calculating Windchill Value

    Did not know there was an old and new value for windchill, all i knew was that is was quite cold if I lifted my face shield
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  2. #2
    not so retired henzilla's Avatar
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    Cool...so to speak!

    pretty big difference between the two. I figure it's bad on days my heated gear feels like it's off once I start rolling
    Steve Henson
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  3. #3
    BUBBAZANETTI
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    Good to know, haven't been much of a Rounder since moving to NYC, but it does give me good appreciation of my 19 degree ride 300 miles from central ma to central ny...............without a heated jacket.

  4. #4
    Riding where it's hot! AZ-J's Avatar
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    This one does Windchill and Heat Index. We need the latter as late Spring, Summer, and early Fall comes.
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  5. #5
    XTrooper
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    I'd rather not know.

    "Ignorance is bliss!"

  6. #6
    Honey Badger Semper_Fi's Avatar
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    Quote Originally Posted by XTrooper View Post
    I'd rather not know.

    "Ignorance is bliss!"

    Good point!
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  7. #7
    BeemerBoy terham's Avatar
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    I prefer the new wind chill index over the old index. It makes you think it's not as bad as you think it is.
    Terence
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  8. #8
    IBA #44567 Ken F's Avatar
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    ........I have a lot easier time believing the old one however.

  9. #9
    You stupid, fix it! r11rs94's Avatar
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    Does this take into account if its a "DRY COLD".
    The thing about traveling is, you never want it to end and you can't wait to get home.
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  10. #10
    Honey Badger Semper_Fi's Avatar
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    Quote Originally Posted by r11rs94 View Post
    Does this take into account if its a "DRY COLD".

    Don't laugh i was walking my dogs this morning in the "dry" cold and I had tears running as the wind was ripping thru me, even the dogs weren't too happy.

    On a side note any body know why we have the old and new Wind chills.....

    Requiring minds want to know
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  11. #11
    angysdad
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    One thing to note...above approx 40mph, friction plays a major role in wind chill values. Very little difference between say, 45 or 70mph. So if you are cold, drive faster. You will not be any warmer, but you will get there sooner. This is not particularly good advice if you have frozen hands, etc. If you are too cold, stop and stay safe!

  12. #12
    IBA #44567 Ken F's Avatar
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    >On a side note any body know why we have the old and new Wind chills.....<

    As copied from directly below the first posted wind chill calculator:

    Specifically, the new WCT index will: use wind speed calculated at the average height (5 feet) of the human body's face instead of 33 feet (the standard anemometer height); be based on a human face model; incorporate modern heat transfer theory (heat loss from the body to its surroundings, during cold and breezy/windy days); lower the calm wind threshold to 3 mph; use a consistent standard for skin tissue resistance; and assume the worst case scenario for solar radiation (clear night sky).

    460

  13. #13
    Honey Badger Semper_Fi's Avatar
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    Quote Originally Posted by angysdad View Post
    One thing to note...above approx 40mph, friction plays a major role in wind chill values. Very little difference between say, 45 or 70mph. So if you are cold, drive faster. You will not be any warmer, but you will get there sooner. This is not particularly good advice if you have frozen hands, etc. If you are too cold, stop and stay safe!
    When my wife get's cold - hang on, luckily I have a GT to keep up with her R in these situations!!
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  14. #14
    Honey Badger Semper_Fi's Avatar
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    Quote Originally Posted by 460Jetboat View Post
    >On a side note any body know why we have the old and new Wind chills.....<

    As copied from directly below the first posted wind chill calculator:

    Specifically, the new WCT index will: use wind speed calculated at the average height (5 feet) of the human body's face instead of 33 feet (the standard anemometer height); be based on a human face model; incorporate modern heat transfer theory (heat loss from the body to its surroundings, during cold and breezy/windy days); lower the calm wind threshold to 3 mph; use a consistent standard for skin tissue resistance; and assume the worst case scenario for solar radiation (clear night sky).

    460

    I just saw the calculator - never read the web page.

    Another one for RTFM!
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  15. #15
    Still Wondering mika's Avatar
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    As 460 explained it is definitions of how to calculate the table. Another explanation for the change is given by Wikipedia. At first it was defined as the temperature at which the wind chill index would eb the same in the complete absence of wind. Later it was redefined from the absence of wind to a air speed of 4mph, the lowest wind speed a cup anemometer could measure at the time. I have seen other explanations as well.

    Sometimes cold is just cold no matter how windy you get.
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