1. Wind Chill Winter 2019

2. Weather Channel

3. Wind Chill
Is a measure how you feel in the cold, taking in consideration of the influence of winds.
There are a lot of misconceptions. For example, if the temperature is 35F and the wind chill is 29F, will water freeze?

4. Wind Chill
The first wind chill formulas and tables were developed by Paul Allman Siple and Charles F. Passel working in the Antarctic before the Second World War, and were made available by the National Weather Service in the 1970s.

5. Measured cooling rates of bottles of water for various combinations of temperature and wind

6. Cooling depends on two things
Difference in temperature between bottle (or skin) and the environmental air
Wind speed, which controls how quickly cold air is mixed down to the bottle/skin, and how rapidly warm air near bottle/skin is moved away.

7. Led to Wind Chill Formula Estimating Loss of Heat as a Function of Tempeature and Wind Speed

8. Formula Changed in 2001

10. Will water freeze with a temperate of 35F and a wind chill of 30F?

11. No….

12. Why goosebumps when cold?
Makes hairs stick up to create more insulation-slows wind near skin too