Re: Problem with the Wind Chill formula's
Re: Problem with the Wind Chill formula's
- Subject: Re: Problem with the Wind Chill formula's
- From: David Groover <email@hidden>
- Date: Fri, 1 Mar 2002 23:20:17 -0500
While I still haven't gotten it to work ... :-(
I would chime in that, the "official" windchill result, seems inadequate
to me. On a motorcycle or otherwise moving through chilled air, OK.
Adding the local humidity, OK too. But what I think is missing relates to
using the windchill to describe the perceived temperatures from the
changes in the weather. ("It's going to be 20 F tonight but with a NW
wind it will feel like it's in the single digits.")
I think that the temperature of the cold air that is behind the weather
front should also factor into the equation. When I lived in Texas we got
what were referred to as "Blue Northers". A strong, fast moving Arctic
air mass that could drop the temperature 40 degrees in a very short time
frame (under 30 minutes). Now we are talking about, current temperature,
wind velocity, humidity of the changing air mass, and, in my opinion, we
should also think about how cold the core air mass is, behind the front.
It seems l;logical that equal velocity winds blowing at equal local
temperatures, would not feel the same if one was from a sub zero front
and one was from a much warmer front. The temperature of the wind should
be a factor. (Measured by the core low temp of the air behind the front.)
Anyway, back to trying to get what I have already been given to work.
Dave Groover
Thus spake email@hidden:
>
On 3/1/02, email@hidden commented:
>
>
>There is at least one problem that I found with the original wind chill
>
>formula: there is no factoring for humidity levels. The wind chill varies
>
>greatly with the water content of the air, and so the originating formula
>
>can't be complete (at least in my mind).
>
>The formula provided was also erroneous in some other ways, as it generated
>
>wind chills of -99 degrees for riding my motorcycle at 70mph in a 49 degree
>
>weather, and that is not reality (or I wouldn't be able to type for loss of
>
>fingers from frost byte :)
>
>
From the NOAA page which is the source of the code and chart
>
mentioned in the other wind chill thread:
>
>
"Note that the Wind Chill is only defined for temperatures in the
>
range -45 F to +45F and wind speeds 3 to 60 mph. Note also that water
>
will not freeze unless its temperature (not the wind chill
>
temperature) reaches the freezing point."
>
>
For more info:
>
>
<http://www.srh.noaa.gov/ftproot/ssd/html/windchil.htm>
>
--
>
Later,
>
>
Rob Jorgensen
>
Ohio, USA
>
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