Weather

Heat advisory issued for South Mississippi

JOHN FITZHUGH/SUN HERALD 
 Eleven-month-old Olivia Knox plays in a fountain near the Ocean Springs Depot during the Red, White & Blueberry Festival on Saturday.
JOHN FITZHUGH/SUN HERALD Eleven-month-old Olivia Knox plays in a fountain near the Ocean Springs Depot during the Red, White & Blueberry Festival on Saturday.

It's going to be hot, hot, hot this weekend, and the high heat and humidity could make for some strong pop-up thunderstorms.

The National Weather Service in Slidell issued a heat advisory Thursday until at least 7 p.m. Friday, and an advisory already has been issued for most of the Mississippi Valley and Southern plains.

The advisory means the heat index -- what the temperature actually feels like -- will be 105 to 110 degrees.

That kind of heat can be very dangerous and lead to heat exhaustion or heat stroke, the weather service warns.

On the Coast, hot and humid conditions are forecast through the weekend. Minor relief is expected Saturday and Sunday, with daytime highs falling slightly from the high 90s to low 90s.

The high humidity means there won't be much relief at night. Temperatures should fall only into the upper 70s Friday night and drop to low 70s Saturday and Sunday.

Unfortunately, the heat-and-humidity combination also makes for stronger thunderstorms.

Isolated to scattered thunderstorms will be possible through Monday, and a few could become strong and produce brief torrential rainfall, gusty winds and frequent lightning -- with the greatest threat over coastal areas and coastal waters. Waterspouts also will be possible.

The greatest concern, though, will be the heat.

"Drink plenty of fluids; stay in an air-conditioned room; stay out of the sun; and check up on relatives and neighbors," the heat advisory says.

For outdoor workers, the Occupational Safety and Health Administration recommends frequent breaks in shaded or air-conditioned environments.

A heat advisory is issued when within 12 hours of the onset of the following conditions: A heat index of at least 105 degrees but less than 115 for less than three hours per day, or nighttime lows above 80 for two consecutive days.

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