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Current Heat Stress 
 

 HeatStress

 
  
  
82.30
DISCLAIMER
This is real time data and may not reflect the current flag status. Please contact one of the following departments for current flag status before beginning any physical outdoor activity. USNA Bancroft Office at 410-293-5001, the NHC Annapolis Preventive Medicine Department at 410-293-4922 between the hours of 0700-1600 Monday-Friday, and the NHC Annapolis OOD at 443-822-2261 after the hours of 1600 and on weekends.

Work/Rest and Water Consumption Table
Applies to average sized, heat-acclimated sailor wearing NWU, hot weather. (See TB MED 507 for further guidance)
    Easy Work Moderate Work Hard Work
   
  • Weapon Maintenance
  • Walking Hard Surface at 2.5 mph, < 30 lb Load
  • Marksmanship Training
  • Drill and Ceremony
  • Manual of Arms
  • Walking Loose Sand at 2.5 mph, No Load
  • Walking Hard Surface at 3.5 mph, < 40 lb Load
  • Calisthenics
  • Patrolling
  • Individual Movement Techniques, i.e. Low Crawl or High Crawl
  • Defensive Position Construction
  • Walking Hard Surface at 3.5 mph, ≥ 40 lb Load
  • Walking Loose Sand at 2.5 mph with Load
  • Field Assaults
Heat Category WBGT Index F° Work/Rest
(min)
Water Intake
(qt/hr)
Work/Rest
(min)
Water Intake
(qt/hr)
Work/Rest
(min)
Water Intake
(qt/hr)
1 (White) <80° NL ½ NL ¾ 40/20 min ¾
2 (Green) 80° - 84.9° NL ½ 50/10 min ¾ 30/30 min 1
3 (Yellow) 85° - 87.9° NL ¾ 40/20 min ¾ 30/30 min 1
4 (Red) 88° - 89.9° NL ¾ 30/30 min ¾ 20/40 min 1
5 (Black) >90° 50/10 min 1 20/40 min 1 10/50 min 1

Notes:

  • The work/rest times and fluid replacement volumes will sustain performance and hydration for at least 4 hrs of work in the specified heat category. Fluid needs can vary based on individual differences (± 1/4 qt/hr) and exposure to full sun or full shade (± 1/4 qt/hr).
  • NL equals no limit to work time per hour (up to 4 continuous hours).
  • Rest means minimal physical activity (sitting or standing), accomplished in shade if possible.
  • CAUTION: Hourly fluid intake should not exceed 1 ½ quarts.
  • Daily fluid intake should not exceed 12 quarts.
  • If wearing body armor, add 5°F to WBGT index in humid climates.
  • If wearing NBC clothing (mission-oriented protective posture (MOPP) 4), add 10°F to WBGT index for easy work, and 20°F to WBGT index for moderate and hard work.