On Monday, January 6, 2014 3:40:02 PM UTC-5, Ed Pawlowski wrote:
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?



Yes I do. But continuing to use cases where the temp is above
freezing doesn't show that the lower the reported windchill, the
more likely pipes in a drafty crawlspace or an unheated cabin
are to freeze when the temps are well below freezing. Again the
qustion posed wasn't about 35F. It was about a day with 0F actual,
-10F windchill.








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.

As someone else pointed out to you several posts ago, that
isn't true either. You're just adding to the confusion.
Any inanimate object with moisture that can evaporate can be
reduced to a temp below that of the air by evaporative cooling.




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.

No one said the thermometer changes. Only that in the case that started
this, where it's 0F with a windchill of -10F, that:

A - windchill does have an effect on inanimate objects

B - in cases like that, where it's below freezing, the lower the windchill,
the more likely pipes are to freeze in a drafty crawlspace, an unheated
cabin, etc.

Again, if all you heard on the weather report was that it was going
to drop to 20F overnight and the windchill, would you be more
concerned about pipes in a drafty crawlspace freezing with a reported
windchill of 20F, or with a windchill of 0F?