Excessive heat warning extended for Johnson County
The National Weather Service issued an excessive heat warning Saturday for Johnson County starting 1 p.m. Sunday and ending 9 p.m. Thursday. An excessive heat warning is issued when there is a heat index of at least 105 degrees for more than three hours per day for two consecutive days, or a heat index of more than 115 degrees for any period of time. A heat advisory is issued when the heat index is at least 105 degrees but less than 115 degrees for less than three hours per day, or when nighttime lows are above 80 degrees for two consecutive days.
Expect the heat wave to cause hot temperatures throughout the week until next weekend. All neighboring counties are included in the warning.
Prolonged exposure to heat and humidity of this magnitude can cause dehydration, heat exhaustion and heat stroke. If you plan to be outside:
- Avoid strenuous activity
- Drink plenty of water
- Wear lightweight, light-colored and loose-fitting clothing
- Wear sunscreen to avoid sunburn
Children, the elderly and those who are chronically ill are at the most risk in extreme heat. The National Weather Service recommends that friends and family members check on those at risk regularly. Temperatures inside cars can also become extreme within a matter of minutes.