WBGT Index (F) |
WBGT Index (F) |
Recommended Activity Restrictions |
78 - 81.9 |
White |
No Restrictions. |
82 - 84.9 |
Green |
Use discretion in planning strenuous activity. |
85 - 87.9 |
Yellow |
When mission permits, limit strenuous exertion; avoid activity in direct sun; observe personnel for water consumption and signs of heat illness. |
88 - 89.9 |
Red |
When mission permits, curtail non-essential strenuous tasks; avoid activity in direct sun; observe personnel for water consumption and signs of heat illness. |
90 and higher |
Black |
Highest risk of heat casualties; suspend all but essential strenuous tasks to meet operational requirements; avoid activity in direct sun; observe personnel for water consumption and signs of heat illness. |