Army Knowledge Online (AKO)
Camp Zama’s Current Heat Index
Courtesy of USA PHR - PAC
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NOTE: Heat Index/Category determination is not a predictive determination. Heat Index/Category values are real time and cannot be forecasted. For more information about the Heat Index please call MEDDAC-J at: DSN 263-5889/5050 or email: MEDDACJ-Chief-EH@amedd.army.mil

WET BULB CHART
Category WBGT Index Nonacclimated Acclimated
 I 
78 81.9 Monitor soldiers and enforce water intake. Caution should be taken. Normal duties.
 II 
 82 84.9 Use discretion in planning intense physical activity. Limited intensity of work and exposure to sun. Provide constant supervision. Normal duties.
 III 
 85 87.9 Strenuous exercises such as close order drills and physical training will be canceled. Outdoor classes in the sun will be canceled. Use discretion in planning intense physical activity. Limit intensity of work and exposure to the sun. Provide constant supervision.
 IV 
 88 89.9 ALL physical training, strenuous activities, and parades will be canceled. Strenuous outdoor activities will be minimized for all personnel with less than 12 weeks training in hot weather. Thoroughly acclimated personnel can carry on limited activity for periods not exceeding 6 hours a day.
 V 
 90 and above Strenuous activity and non-essential duty will be canceled for ALL soldiers.

OVER-HYDRATION?
Proper fluid replacement (hydration) is one of the most essential elements in heat injury prevention. The newly revised fluid replacement chart (below) describes the amounts of fluid replacement and work/rest cycles for acclimated soldiers undergoing training. Of particular note is the fact that the revised maximum hourly fluid intake should NOT exceed 1.5 quarts and the revised maximum daily intake should NOT exceed 12 quarts.

In 1998, the U.S. Army Research Institute for Environmental Medicine (USARIEM) provided revised recommendations. Comments on that document and some additional work performed at USARIEM have resulted in the table below.

Fluid Replacement Guidelines for Warm Weather Training
(Applies to average acclimated soldier-wearing BDU, Hot Weather)
Heat
Category		 WGBT
Index, F		 Easy Work Moderate Work Hard Work
Work/
Rest
(min)		 Water
Intake,
Qt/hr		 Work/
Rest
(min)		 Water
Intake,
Qt/hr		 Work/
Rest
(min)		 Water
Intake,
Qt/hr
1 78-81.9 NL 1/2 NL 3/4> 40/20 3/4
2 82-84.9 NL 1/2 50/10 3/4 30/30 1
3 85-87.9 NL 3/4 40/20 3/4 30/30 1
4 88-89.9 NL 3/4 30/30 3/4 20/40 1
5 >90 50/10 1 20/40 1 10/50 1
  • The work/rest times and fluid replacement volumes will sustain performance and hydration for at least 4 hours of work in the specified heat category. Individual water needs will vary +/- qt/hr.
  • NL= no limit to work time per hour.
  • Rest means minimal physical activity (sitting or standing), accomplished in shade if possible.
  • CAUTION: Hourly fluid intake should not exceed 1.5 quarts.
  • Daily fluid intake should not exceed 12 quarts.
  • Wearing body armor add 5F to WBGT Index.
  • Wearing MOPP overgarment add 10F to WBGT Index.

Easy Work Moderate Work Hard Work
  • Walking hard surface at 2.5 mph, < 31 lb. load.
  • Weapon Maintenance
  • Manual of Arms
  • Marksmanship Training
  • Drill and Ceremony
  • Walking hard surface at 3.5 mph, < 41 lb. load.
  • Walking loose sand at 2.5 mph, no load.
  • Calisthenics
  • Individual Movement Techniques, i.e. low crawl, high crawl.
  • Defense position Construction
  • Field Assaults
  • Walking hard surface at 3.5 mph, > 40 lb. load.
  • Walking loose sand at 2.5 mph with load.

PRIVACY AND SECURITY NOTICE