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U
V
Exposure level
Color
0
-
-
0.1 to 2.9
Low
Green
3.0 to 5.9
Moderate
Yellow
6.0 to 7.9
High
Orange
8.0 to 10.9
Very High
Red
≥11.0
Extreme
Purple
Figure 28
5.13.2
Wind Chill
Wind Chill is the perceived decrease in air temperature felt by the body on exposed skin due to the
flow of air and is calculated based on temperature and wind speed.
Wind chill numbers are always lower than the air temperature for values where the formula is valid.
The wind chill calculation is only valid for temperatures less than 40 °F and wind speeds greater than
0 mph, according to the National Weather Service.
5.13.3
Heat Index
Heat Index is an index that combines air temperature and relative humidity, as an attempt to determine
the human-perceived equivalent temperature.
The heat index calculation is only valid for temperatures greater than 80 °F and less than 120 °F, and
humidity greater than 40%, according to the National Weather Service. If it is below 80 °F, the console
will display Lo.
Level
Heat Index
Range (°F)
Notes
Caution
80-90
Fatigue is possible with prolonged exposure and activity.
Continuing activity could result in heat cramps.
Extreme Caution 90-105
Heat cramps and heat exhaustion are possible. Continuing
activity could result in heat stroke.
Danger
105-130
Heat cramps and heat exhaustion are likely; heat stroke is
probable with continued activity.
Extreme Danger
Over 130
Heat stroke is imminent.
Figure 29
