| Category | Heat Index | Possible heat disorders for poeple in high risk rgoups |
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| Heat stroke or sunstroke likely. |
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| Sunstroke, muscle cramps, and/or heat exhaustion likely. Heatstroke possible with prolonged exposure and/or physical activity. |
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| Sunstroke, muscle cramps, and/or heat exhaustion possible with prolonged exposure and/or physical activity. |
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| Fatigue possible with prolonged exposure and/or physical activity. |
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