A New Wind Chill Chart
These original Kirt's Cogitations™ may be reproduced
(no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.
here to return to the Table of Contents.
Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted
reflection; meditation; contemplation.
Kirt [kert] – proper noun: RF Cafe webmaster.
It has been said
that the only thing constant in this world is change, and now even the
familiar old wind chill chart has been revamped. The old formula for
the chart was derived in the 1940s by a method that noted the length
of time required for a bottle of water to freeze under a variety of
wind speeds and air temperatures. Since little was known about the thermal
transfer properties of skin at the time, the chosen plastic container
skewed the results. The old chart yielded a wind chill factor that was
too low - by tens of degrees Fahrenheit in extreme cases. Using modern
methods that involve bringing the skin of human volunteers to near freezing,
a new formula - and new chart - was born in the year 2000. An example:
A 20 °F day with 10 mph wind, now has a wind-chill rating of 9 °F instead
of 3 °F.