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Thread: Wind Chill

  1. #1
    Join Date
    Mar 2011
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    Winfield, Iowa
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    397

    Default Wind Chill

    Even on nice sunny days when the wind blows the sap doesn't run well, my understanding is it's because of the chilling factor of wind on the trees. Does it work the other way also? If it's 33°F and has a "feels like" temp of 22°F does that count as below freezing temperature? Just curious, Ted

  2. #2
    Join Date
    May 2009
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    UVM Proctor Maple Research Center, Underhill Ctr, VT
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    Default

    No, wind chill is a term meant to explain how cold it feels for humans (or animals in general). The temperature is not actually that cold, but your nervous system tells you it is colder because of the wind and removal of heat from your body.

    Objects like trees (or rocks) don't experience windchill. If it is 30 degrees and windy (and enough time has passed for the object to stabilize) and there is no sun, then the object is 30 degrees, not something lower.

    Now what can happen is that heat can be added to the object by the sun, or heat can be taken away faster by the wind (which decreases the boundary layer resistance), but cooling won't drop the temperature of the object below that of the air.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

  3. #3
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    Mar 2011
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    Winfield, Iowa
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    Default

    Thanks Dr. Tim. Wind is a one way street, got it. Ted

  4. #4
    Join Date
    Feb 2007
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    Default

    My dad would tell me the old guys would say ( back in the 1930's) ....
    Wind from the North sap flows forth
    Wind from the East sap flows the least
    Wind from the West sap flows the best
    Wind from the South sap has a drought
    Dos that hold true Dr. Tim???
    2x5 SS home design on a home design arch w/ forced draft
    SS Evaporation Enhancement Unit
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    300 taps (280 on line, 20 buckets)
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    2017 Chevy Silverado w/ 275 gallon tank
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    A wife, family and friends that love to help!!

  5. #5
    Join Date
    May 2009
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    UVM Proctor Maple Research Center, Underhill Ctr, VT
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    I have an hour-long presentation on biological and environmental factors that affect sap flow and sugar yield which includes that poem. Answer is -- sometimes.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

  6. #6
    Join Date
    Mar 2015
    Location
    eastern ontario- Williamstown
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    Default

    Answer is -- sometimes.[/QUOTE]

    Lol.
    Ian McDonald
    2000 on vacuum
    1000gph cdl ro
    2.5'x12' intensofire

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