ken@ihuxq.UUCP (01/17/84)
Two questions:
(1) Does anyone have the formula for the wind-chill index?
(2) Is there a quantifiable relationship between wind velocity
and temperature, that is, is the air in a 20 knot wind on
a 20-degree day warmer than still air at that temperature
(because of thermal effects from the larger motion)? If
there is a relationship, it could be included in the wind-chill
index (opposite sign from the evaporative cooling factor,
of course).
If you don't think milli-degrees make a difference, you
haven't had to talk yourself into going to work when it's
25 below and blowing hard.
Just trying to keep warm. It's not that easy on a motorcycle.
--
*** ***
JE MAINTIENDRAI ***** *****
****** ****** 17 Jan 84 [28 Nivose An CXCII]
ken perlow ***** *****
(312)979-7261 ** ** ** **
..ihnp4!ihuxq!ken *** ***van@sequent.UUCP (01/19/84)
The following table is taken from the Daily Planet Almanac (without
permission). They don't give any sources, so it may be true that there
really isn't any scientific basis for Wind Chill Factors.
TEMPERATURE (degrees Fahrenheit)
Wind calm | 50 40 30 20 10 0 -10 -20 -30 -40
Speed |
(mph) 5 | 48 37 27 16 6 -5 -15 -26 -36 -47
|
10 | 40 28 16 4 -9 -21 -33 -46 -58 -70
|
15 | 36 22 9 -5 -18 -32 -45 -58 -72 -85
|
20 | 32 18 4 -10 -25 -39 -53 -67 -82 -96
|
25 | 30 16 0 -15 -29 -44 -59 -74 -88 -104
|
30 | 28 13 -2 -18 -33 -48 -63 -79 -94 -109
|
35 | 27 11 -4 -20 -35 -51 -67 -82 -98 -113
|
40 | 26 10 -6 -21 -37 -53 -69 -85 -100 -116
There is a curve that runs through 5MPH/-10, 10/0, 15/10, 20/10, 25/15,
30/20, 35/20, 40/20. To the left of that it says "Little Danger".
Another curve runs through 10MPH/-30, 15/-20, 20/-15, 25/-10, 20/-10,
35/-5, 40/-5. Between these curves is the label "Moderate Danger".
To the right of this last curve is the label "Great Danger".
--
John Vander Borght ...{ogcvax,pur-ee}!sequent!vanadnerb@houxz.UUCP (01/23/84)
Indeed there is a rather complicated formula to determine
wind chill factor. I have seen it on several occasions,
but, alas, I have no reference.
Russ Kurtzstevesu@azure.UUCP (Steve Summit) (01/25/84)
The so-called "wind chill" is completely subjective and has no
scientific formula. I will be posting an article to net.flame
shortly on this very topic.
Steve Summit
tektronix!tekmdp!stevesugjphw@ihuxm.UUCP (Can you believe?: Patrick H. Wyant) (01/26/84)
I would like to wade into this discussion with another vote in favor
of the existence of a verified wind chill function. While taking a
course in meteorology, we were told that the wind chill factor can be
obtained from a function that depends upon the wind speed, ambient air
temperature, and the relative humidity. A meteorologist had spent a
tremendous amount of time assessing the effects of cold winds on exposed
human skin. The wind chill factor is the result of these experiments.
Unfortunately, we were not given names or references for this feat.
Perhaps next time.
--
Patrick Wyant
AT&T Bell Laboratories (Naperville, IL)
*!ihuxm!gjphw