American football heat-practice overlay. The WBGT practice-modification thresholds originate from the Georgia High School Association By-Law 2.67 heat policy, reproduced as an example in an NFL-hosted Korey Stringer Institute presentation.
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No standalone formula is published for this standard; see programmable logic and parameters below.
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | Routine | Routine | Routine | Routine |
| 25 | Routine | Routine | Routine | Routine |
| 26 | Routine | Routine | Routine | Routine |
| 27 | Routine | Routine | Routine | Routine |
| 28 | Caution | Caution | Caution | Caution |
| 29 | Caution | Caution | Caution | Caution |
| 30 | Caution | Caution | Caution | Caution |
| 31 | High | High | High | High |
| 32 | High | High | High | High |
| 33 | Extreme | Extreme | Extreme | Extreme |
| 34 | Stop work | Stop work | Stop work | Stop work |
| 35 | Stop work | Stop work | Stop work | Stop work |
| 36 | Stop work | Stop work | Stop work | Stop work |
This standard's declared inputs do not include acclimatization status, so results do not vary by it.
Required inputs: wbgtC
Optional inputs: none
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Get notified when NFL / American Football Heat Practice Overlay changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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