On 1/6/2014 9:14 AM, wrote:



No, it shows the effects of wind but has nothing to do with the

windchill factor on the 11 o'clock news

If it has nothing to do with the reported windchill, then you're
answer to the above question is that it makes no difference?
The pipes are just as likely to freeze in that crawlspace on a
night when the windchill is 0F, as they are when the windchill is
20F, even though the outside air is 20F, both nights?

Yes, but they won't freeze if the air temperature is 33 degrees and the
wind chill is 20. See the difference?



Here, from the Weather Channel:
http://www.weather.com/activities/ho...e_prevent.html


"Pipes in attics, crawl spaces and outside walls are all vulnerable to freezing, especially if there are cracks or openings that allow cold, outside air to flow across the pipes. Research at the University of Illinois has shown that €œwind chill,€� the cooling effect of air and wind that causes the human body to lose heat, can play a major role in accelerating ice blockage, and thus bursting, in water pipes."


From City of Rochester:

http://www.rochesternh.net/public_Do...ER%20PIPES.pdf
"Pipes inside or outside walls, or in an enclosed area can freeze,
especially when the wind-chill factor is well below zero and heat is
not circulating in those areas."


The problem still goes back to definition. It has become diluted from
the original intent of how the body feels. Yes, wind can carry heat away
faster, but it will never reduce it below actual temperature on an
inanimate object. Many weather reports now use the "real feel"
designation and it considers how hot you feel on a warm and dry versus
warm and humid day. Same with cold. But the thermometer does not change.