Heat Stress Wet Bulb Globe Temperature WBGT [2.0]
Updated
by
Travis Bates
IN THIS ARTICLE
Heat stress assesses the risk level of outdoor activities using the Wet Bulb Globe Temperature or WBGT. The stress thresholds allow users to track when heat stress will be experienced, and determine the duration and intensity of outdoor activities. WBGT thresholds are region-dependent.
WBGT by Region (degrees °F)
Color | Risk | Region 1 | Region 2 | Region 3 |
Black | Extreme | > 84.0 | > 87.6 | >90 |
Red | High | 80.2 - 84.0 | 83.8 - 87.6 | 86.1 - 90.0 |
Orange | Moderate | 76.2 - 80.1 | 78.8 - 83.7 | 82.1 - 86.0 |
Yellow | Elevated | 72.3 - 76.1 | 75.9 - 78.7 | 78.3 - 82.0 |
Green | Low | < 72.3 | < 75.9 | < 78.3 |
WBGT by Region (degrees °C)
Color | Risk | Region 1 | Region 2 | Region 3 |
Black | Extreme | > 28.9 | > 30.9 | >32.2 |
Red | High | 26.8 - 28.9 | 28.8 - 30.9 | 30.1 - 32.2 |
Orange | Moderate | 24.6 - 26.7 | 26.0 - 28.7 | 27.8 - 30.0 |
Yellow | Elevated | 22.4 - 24.5 | 24.4 - 25.9 | 25.7 - 27.8 |
Green | Low | < 22.4 | < 24.4 | < 25.7 |
Regions (image source: National Oceanic and Atmospheric Administration NOAA).
Heat Index (degrees °F)
Color | Classification | Heat Index °F | Heat Index °C |
Red | Extreme Danger | > 125 | > 54 |
Orange | Danger | 103 - 124 | 41 - 54 |
Yellow | Extreme Caution | 90 - 103 | 32 - 41 |
Light Yellow | Caution | 80 - 90 | 27 - 32 |
Green | Comfortable | < 80 | < 27 |
Support
Wet Bulb Globe Temperature can be calculated from any ATMOS 41 sensor.
Recommended sensors
- ATMOS 41
- ATMOS 41W
New Wet Bulb Globe Temperature
- On the Data page, select New Data.
- Select Wet Bulb Globe Temperature WBGT as the type.
- Select one or more ATMOS 41 data sources.
- Edit the data stream color.
- Edit the data stream name.
- Select Create to finish.
- The new data stream(s) will now be in your data list.
