The National Oceanic and Atmospheric Administration (NOAA) has developed a heat index chart parents and coaches can use to determine when heat and humidity have reached the point where athletes are at serious risk of heat illnesses, such as heat cramps, heat exhaustion or even heat stroke.
How to use Heat Index:
- Locate on the chart above the current Air Temperature down left side
- Locate the current Relative Humidity across the top
- Follow across and down to find Apparent Temperature (what it feels like to the body)
- Determine heat stress risk on chart below
Heat Illness Risk
|Apparent Temperature||Heat Stress Risk with Physical Activity and/or Prolonged Exposure|
|80° to 90°||Exercise caution; dehydration likely if athlete fails to drink adequate fluids|
|91° to 103°||Exercise extreme caution: Heat cramps or heat exhaustion possible|
|104° to 124°||Danger: Exertional heat cramps or heat exhaustion likely, heatstroke possible|
|125° and up||Extreme Danger: Exertional Heatstroke highly likely|
A helpful iPhone application called iHydrateTM, calculates the heat index at your location and provides the heat illness risk.