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SIOUX FALLS, S.D. (KELO) — The heat index in southeast KELOLAND is going to be high over the next two days. The KELOLAND Live Doppler HD Storm Center says it could be near 105-110 degrees.
Track the weather in your area by downloading the KELOLAND Storm Tracker app.
What is heat index?
Basically, the heat index is what it feels like. The heat index is calculated using the temperature + relative humidity (there is actually a much more intense math equation to figure it out).
Interestingly, the heat index values in the chart above are for shady locations. If you’re in direct sunlight add in 15 degrees.
| Classification | Heat Index | Effect on the body |
| Caution | 80°F – 90°F | Fatigue possible with prolonged exposure and/or physical activity |
| Extreme Caution | 90°F – 103°F | Heat stroke, heat cramps, or heat exhaustion possible with prolonged exposure and/or physical activity |
| Danger | 103°F – 124°F | Heat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity |
| Extreme Danger | 125°F or higher | Heat stroke highly likely |