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Wind Chill |
Advisory & Warning Criteria | Wind Chill Calculator | Wind Chill Chart
Wind Chill is the term used to describe the rate of heat loss on the human
body resulting from the
combined effect of low temperature and wind. As winds
increase, heat is carried away from the body at a faster rate, driving down both
the skin temperature and eventually the internal body temperature. While
exposure to low wind chills can be life threatening to both humans and animals
alike, the only effect that wind chill has on inanimate objects, such as
vehicles, is that it shortens the time that it takes the object to cool to the
actual air temperature (it cannot cool the object down below that temperature).
Additional
information, including PDF brochures and Wind Chill Charts, can be found on the National
Weather Service Wind Chill Page.
Wind Chill Advisory and Warning
Criteria
for the
NWS Sioux Falls
County Warning Area
During times of adverse cold weather, wind chill advisories and warnings are issued by the National Weather Service to alert the general public of the impending threat. As with other winter weather events, advisories are issued when the wind chill is more of a nuisance rather than life-threatening. While the warnings are issued when the wind chill can be life-threatening if an individual is not properly dressed for the cold.
- Wind Chill Advisory: Issued when the wind chill is 20 below zero or lower
with a minimum of a 10 mph wind. - Wind Chill Warning: Issued when the wind chill is 35 below zero or lower
with a minimum of a 10 mph wind.
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Here is how you calculate the Wind Chill Index: Wind Chill T(wc) = 35.74 + 0.6215T - 35.75(V0.16) + 0.4275T(V0.16) where T(wc) is the Wind Chill in degrees F,
V is the Wind Speed in MPH, and |
Wind Chill Chart
| Temperature (F) | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Wind |
Calm | 40 | 35 | 30 | 25 | 20 | 15 | 10 | 5 | 0 | -5 | -10 | -15 | -20 | -25 | -30 | -35 | -40 | -45 |
| 5 | 36 | 31 | 25 | 19 | 13 | 7 | 1 | -5 | -11 | -16 | -22 | -28 | -34 | -40 | -46 | -52 | -57 | -63 | |
| 10 | 34 | 27 | 21 | 15 | 9 | 3 | -4 | -10 | -16 | -22 | -28 | -35 | -41 | -47 | -53 | -59 | -66 | -72 | |
| 15 | 32 | 25 | 19 | 13 | 6 | 0 | -7 | -13 | -19 | -26 | -32 | -39 | -45 | -51 | -58 | -64 | -71 | -77 | |
| 20 | 30 | 24 | 17 | 11 | 4 | -2 | -9 | -15 | -22 | -29 | -35 | -42 | -48 | -55 | -61 | -68 | -74 | -81 | |
| 25 | 29 | 23 | 16 | 9 | 3 | -4 | -11 | -17 | -24 | -31 | -37 | -44 | -51 | -58 | -64 | -71 | -78 | -84 | |
| 30 | 28 | 22 | 15 | 8 | 1 | -5 | -12 | -19 | -26 | -33 | -39 | -46 | -53 | -60 | -67 | -73 | -80 | -87 | |
| 35 | 28 | 21 | 14 | 7 | 0 | -7 | -14 | -21 | -27 | -34 | -41 | -48 | -55 | -62 | -69 | -76 | -82 | -89 | |
| 40 | 27 | 20 | 13 | 6 | -1 | -8 | -15 | -22 | -29 | -36 | -43 | -50 | -57 | -64 | -71 | -78 | -84 | -91 | |
| 45 | 26 | 19 | 12 | 5 | -2 | -9 | -16 | -23 | -30 | -37 | -44 | -51 | -58 | -65 | -72 | -79 | -86 | -93 | |
| 50 | 26 | 19 | 12 | 4 | -3 | -10 | -17 | -24 | -31 | -38 | -45 | -52 | -60 | -67 | -74 | -81 | -88 | -95 | |
| 55 | 25 | 18 | 11 | 4 | -3 | -11 | -18 | -25 | -32 | -39 | -46 | -54 | -61 | -68 | -75 | -82 | -89 | -97 | |
| 60 | 25 | 17 | 10 | 3 | -4 | -11 | -19 | -26 | -33 | -40 | -48 | -55 | -62 | -69 | -76 | -84 | -91 | -98 | |
| Frostbite occurs in 15 minutes or less | |||||||||||||||||||
