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Question
Identify the apparent temperature when the air temperature is -25 • F and the winspeed is 20 mph
Transcribed Image Text:Wind (mph)
Calm 40 35 30 25 20 15
5
36 31 25
10
34 27 21
15
32
20 30
25 29
30 28
3.5 28
40 27
45 26
50 26
55 25
18 11
60 25 17 10
953
Wind Chill Chart
Temperature (°F)
10
50 -5 -10 15
20 25 30 35 40 45
1
-5 -11 -16
22 -28 -34 -40 -46 52 -57 -63
-4
-10 -16 -22
-7 -13 19 -26
-9 -15 -22 -29
-28 -35 -41 -47 -53 -59 -66 -72
-32 -39 -45 -51 -58 -64 -71 -77
-35 -42 -48 -55
-61 -68 -74 -81
-11
-37 -44 -51 -58
-12
-17 -24 -31
-64 -71 -78 -84
19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -87
-76 -82 -89
-14 -21 -27 -34 -41
-78-84 -91
-48 -55 -62 -69
-15 -22 -29 -36 -43 -50 -57 -64 -71
-44 -51 -58 -65 -72
-45 -52 -60 -67 -74 -81 -88 -95
-16 -23 -30 -37
-79 -86 -93
-17 -24 -31 -38
-46 -54 -61 -68 -75 -82 -85 -97
18 -25 -32 -39
-19 -26 -33 -40 -48 -55
-62 -69 -76 -84 -91 -98
210
19 13 7
25 19 13 6
2 17 11
23 16
9
22 15
8
21 14
7
20 13 6
19 12
19
9
4
3
1
0
S -2
4
4
3
نہ بن بن ط
-3
3
MONY
0
-2
-5
-7
-8
-9
-10
-3 -11
-11
10 minutes
Frostbite Times
Wind Chill (°F) = 35.74 +0.6215T-35.75(V0.16) +0.4275T(V⁰.16)
Where, T= Air Temperature (°F) V- Wind Speed (mph)
10 minutes
5 minutes
Effective 11/01/01
The NWS Wind Chill Temperature (WCT) Index uses advances in science, technology, and computer modeling to provide an accurate, understandable, and useful
formula for calculating the dangers from winter winds and freezing temperatures. The index does the following:
• Calculates wind speed at an average height of 5 feet, the typical height of an adult human face, based on readings from the national standard height of
33 feet, which is the typical height of an anemometer
. Is based on a human face model
. Incorporates heat transfer theory based on heat loss from the body to its surroundings, during cold and breezy/windy days
▪ Lowers the calm wind threshold to 3 mph
Uses a consistent standard for skin tissue resistance
. Assumes no impact from the sun, i.e., clear night sky.
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