Re: [apple-crop] wind chill

[Jon Clements]

I found this explanation on Wikipedia to be most informative:

The effect of wind chill is to increase the rate of heat loss and reduce
any warmer objects to the ambient temperature more quickly. Dry air cannot,
however, reduce the temperature of these objects below the ambient
temperature, no matter how great the wind velocity. For most biological
organisms, the physiological response is to generate more heat in order to
maintain a surface temperature in an acceptable range. The attempt to
maintain a given surface temperature in an environment of faster heat loss
results in both the perception of lower temperatures and an actual greater
heat loss. In other words, the air 'feels' colder than it is because of the
chilling effect of the wind on the skin. In extreme conditions this will
increase the risk of adverse effects such asfrostbite
.

On Thu, Feb 18, 2016 at 1:12 PM, Glen Koehler 
wrote:

> Hi Art
>   Plants respond to ambient temperature and unlike warm blooded animals do
> not create their own.  So wind chill does not affect them.  Wind x
> temperature could have an effect on moisture relations within the plant,
> but I think that is not a major issue.  At least that's my understanding of
> the situation.  I know growers who are convinced that wind chill affects
> trees but that's not how I understand it.
> - Glen
>
> Glen Koehler
> University of Maine Cooperative Extension
> Pest Management Office
> Voice:  Office 207-581-3882,   Cell  207-485-0918
> 491 College Avenue, Orono, ME  04473
>
>
>
> On Sat, Feb 13, 2016 at 9:53 PM, Arthur Kelly 
> wrote:
>
>> Does anyone have a handle on how wind chill relates to fruit bud critical
>> temps.  We are expecting -11F tonight with a wind chill effect of around
>> -30 F.
>>
>> --
>> Art Kelly
>> Kelly Orchards
>> Acton, ME
>>
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>>
>
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>


-- 
Jon Clements
aka 'Mr Honeycrisp'
UMass Cold Spring Orchard
393 Sabin St.
Belchertown, MA  01007
413-478-7219
umassfruit.com
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Re: [apple-crop] wind chill

[Glen Koehler]

Hi Art
  Plants respond to ambient temperature and unlike warm blooded animals do
not create their own.  So wind chill does not affect them.  Wind x
temperature could have an effect on moisture relations within the plant,
but I think that is not a major issue.  At least that's my understanding of
the situation.  I know growers who are convinced that wind chill affects
trees but that's not how I understand it.
- Glen

Glen Koehler
University of Maine Cooperative Extension
Pest Management Office
Voice:  Office 207-581-3882,   Cell  207-485-0918
491 College Avenue, Orono, ME  04473



On Sat, Feb 13, 2016 at 9:53 PM, Arthur Kelly 
wrote:

> Does anyone have a handle on how wind chill relates to fruit bud critical
> temps.  We are expecting -11F tonight with a wind chill effect of around
> -30 F.
>
> --
> Art Kelly
> Kelly Orchards
> Acton, ME
>
> ___
> apple-crop mailing list
> apple-crop@virtualorchard.net
> http://virtualorchard.net/mailman/listinfo/apple-crop
>
>
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Re: [apple-crop] wind chill

[David A. Rosenberger]

So far as I know, wind chill is pretty much irrelevant when it comes to plants 
and other life forms that are not warm-blooded creatures.  Wind-chilll provides 
an estimate of how we perceive the cold, but the measured temperature on the 
thermometer is still  the temperature experienced by trees.  Winds can affect 
plants by increasing desiccation, especially if winds persist over long periods 
of time, but I don’t think a single night of very low wind chills will have 
much impact on dormant trees.  With very cold nights and high winds, I suppose 
there could eventually be some freeze-drying effects, but I don’t think I’ve 
ever heard much about that kind of damage on trees?

Dave Rosenberger, Plant Pathologist,
Hudson Valley Lab, P.O. Box 727, Highland, NY 12528
Cell: 845-594-3060


On Feb 13, 2016, at 9:53 PM, Arthur Kelly 
> wrote:

Does anyone have a handle on how wind chill relates to fruit bud critical 
temps.  We are expecting -11F tonight with a wind chill effect of around -30 F.

--
Art Kelly
Kelly Orchards
Acton, ME
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