| Heat Index | Alert level | Possible heat disorder |
| 80˚F - 90˚F | Caution | Fatigue is possible with prolonged exposure and activity |
| 90˚F - 105˚F | Extreme caution | Sunstroke, heat cramps and heat exhaustion |
| 105˚F - 130˚F | Danger | Sunstroke, heat cramps and heat exhaustion likely, and heat stroke |
| 130˚F or greater | Extreme danger | High heat stroke by continuous exposure |