🚀 go-pugleaf

here's some of what i have found about 'wind chill'

from our local newspaper (the kingsville record, 1-22-92, p. 1c):
   The term wind-chill was invented by the Antartica explorer Paul A.
   Siple in 1939.  During his stay in Antarctica with his colleague,
   Charles F. Passel, the two conducted experiments on the time
   required to freeze 250 grams of water in a plastic cyllinder placed
   outside in the wind.

the article goes on to say that Siple and Passel published their findings
along with a formula that is still used today to compute wind-chill
in 1945, but the article gave no reference.

from an algebra text (i cannot remember which one):

the equation  h = ( a + b * sqrt(v) - c * v ) ( s - t)

  where   h= heat loss (btu's/sq.f. of skin)
          t= air temperature (farenheit)
          v= wind speed (mi/hr)
          s= 91.4 deg F (neutral skin temp)
          a = 2.14, b = 1.37, and c=0.0916 (experimentally determined
                                             constants)

can be used to determine the 'wind-chill index'

to do so, simply note that the wind-chill index is the equivalent
temperature which has the same heat loss as with a temperature
with a 4 mi/hr wind ( the speed of a brisk walk).

so if we denote the wind-chill index by te (for temp. equiv.), we
merely need to solve

(a+b*sqrt(v)-c*v)*(s-t)=(a+b*sqrt(4)-4*c)*(s-te)

for te.


having said all this, i don't know if the formula above is related the
work of Siple and Passel.  also, related to an earlier graph-ti post, a
wind  of 0 mi/hr would give a higher equivalent temp than the actual temp
since the neutral temp is based on a 4 mi/hr wind.

have fun,  george tintera