In northern Alabama, forecasters with the weather service's Huntsville office said Monday they issued the first "excessive heat warning" for the area in more than seven years.
The humidity will make it feel a few degrees hotter.
With temperatures around 100 degrees (37 Celsius) at midday and "feels like" temperatures soaring even higher, parts of 13 states were under heat advisories, from Texas, Louisiana and Florida in the South to Missouri and IL in the Midwest, the National Weather Service reported.
Heat stroke is an emergency, Call 911. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and check up on relatives and neighbors. When possible, reschedule strenuous activities to early morning or evening.
Today and Tonight: Temperatures will fire into the 90s by lunchtime. The current Heat Advisory expires at 7 p.m. Monday before transitioning into the Excessive Heat Warning. The combination of hot temperatures and high humidity will combine to create a risky situation in which heat illnesses are likely.
Up Next: The upper level ridge responsible for several days of high heat will retreat westward by mid-week.
A cold front will bring a better chance of showers and storms Wednesday into Thursday, along with some cooler temps for the end of the week. Also, precipitation will cut into the duration of the heat.
The Tropics: The Gulf of Mexico, Caribbean Sea and Atlantic Ocean are quiet at this time.
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