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Estimated <br />Wind <br />Speed (mph) <br />Actual Temperature Reading (degrees F) <br />50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 <br />Equivalent chill Temperature (degrees F) <br />calm <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />40 <br />0 -10 -20 40 <br />47 <br />70 <br />50 -60 <br />57 -68 -5 -15 <br />10 <br />6 <br />-9 <br />18 <br />24 <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 0 -15 <br />28 13 -2 -18 <br />27 11 -4 -20 <br />26 10 -6 -21 <br />32 <br />-39 <br />44 <br />-48 <br />51 <br />53 <br />-33 <br />-45 <br />-53 <br />59 <br />-63 <br />67 <br />69 <br />26 <br />46 <br />-58 <br />-67 <br />30 <br />-36 <br />58 <br />72 <br />83 -95 <br />99 -112 <br />110 -121 <br />-118 -133 <br />125 -140 <br />-129 -145 <br />132 -148 <br />25 <br />29 <br />33 <br />35 <br />37 <br />74 <br />79 <br />82 <br />-85 <br />85 <br />-96 <br />104 <br />-109 <br />113 <br />116 <br />82 <br />88 <br />94 <br />98 <br />100 <br />(Wind speeds > 40 <br />mph have little <br />additional effect) <br />LITTLE DANGER <br />If < hr with thy 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