Laserfiche WebLink
Estimated <br />Wind <br />Speed (mph) <br />Actual Temperature Reading (degrees F) <br />50 <br /> 40 30 20 10 0 -10 -20 -30 -40 -50 -60 <br />Equivalent chill Temperature (degrees F) <br />50 -60 <br />57 -68 <br />83 -95 <br />85 -99 -112 <br />82 -96 -110 -121 <br />-74 -88 -104 -118 -133 <br />79 -94 -109 -125 -140 <br />82 -98 -113 -129 -145 <br />85 -100 -116 -132 -148 <br />calm <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />40 <br />50 40 30 20 <br />48 37 27 16 <br />40 28 16 4 <br />36 22 9 -5 <br />32 18 4 -10 <br />30 16 -15 <br />28 13 -2 -18 <br />27 11 -4 -20 <br />26 10 -6 -21 <br />10 <br />6 <br />-9 <br />18 <br />25 <br />29 <br />-33 <br />-35 <br />-37 <br />0 <br />-5 <br />24 <br />32 <br />39 <br />44 <br />48 <br />51 <br />53 <br />-10 <br />-15 <br />33 <br />45 <br />53 <br />59 <br />-63 <br />-67 <br />-69 <br />20 <br />26 <br />46 <br />-58 <br />67 <br />30 <br />-36 <br />-58 <br />72 <br />-40 <br />47 <br />-70 <br />(Wind speeds > 40 <br />mph have little <br />additional effect) <br />LIII LE DANGER <br />If < hr with dry skin. Maximum danger of <br />false sense of security <br />INCREASING DANGER <br />Danger from freezing of <br />exposed flesh within one <br />minute. <br />GREAT DANGER <br />Flesh may freeze within 30 seconds. <br />Trench foot and immersion foot may occur at any point on this chart. <br />TABLE 5-2 <br />Cooling Power of Wind on Exposed Flesh Expressed as <br />Equivalent Temperature (under calm conditions)* <br />Developed by U.S. Army Research Institute of Environmental Medicine, Natick, MA <br />HASP Level III <br />Rev. 01 —(June 11,2007) 5-5