New Orleans Turns Into Pressure Cooker as 115° Heat Index Builds Before Storms Blast In

New Orleans starts Friday, August 21, mostly clear and already warm, but the quiet morning will give way to dangerous heat. Highs should reach about 95 degrees, with heat-index readings potentially climbing as high as 115 during the afternoon.

Extreme Heat Arrives Before Storm Chances

An Extreme Heat Warning is in effect from 11 a.m. to 8 p.m. Friday for the New Orleans area, according to the National Weather Service. Forecasters say heat-related illnesses could increase significantly, especially for people working or exercising outdoors.

Light northwest winds near 5 mph will do little to ease the afternoon conditions. A slight chance of showers and thunderstorms arrives after 3 p.m., with a better opportunity for storms Friday afternoon and evening than New Orleans has seen in recent days.

Storms Could Bring Lightning And Heavy Rain

Only about 20% of the city is expected to see measurable rain, but storms that do form could pack frequent lightning, heavy downpours and strong, possibly damaging winds. Small hail is also possible, so outdoor plans should have a backup once the afternoon heat peaks.

Friday night stays muggy, with a low around 80 and temperatures rising slightly overnight. A 30% chance of showers and thunderstorms remains in place before midnight, meaning the air-conditioning may get a longer workout than the umbrellas.

Hot Weekend Keeps The Heat On

Saturday looks sunny with a high near 96 and another heat index near 110, followed by a mostly clear night around 81. Sunday may be the hottest day of the stretch, reaching about 97 under sunny skies, with another warm overnight low near 81.

Mostly sunny conditions return Monday with a high near 95, while rain chances increase from Tuesday through Thursday. Highs should ease into the lower 90s, but afternoon thunderstorms become more likely, reaching roughly 35% Tuesday, 42% Wednesday and 49% Thursday.

Stay Cool During The Warning

Drink plenty of fluids, stay in air conditioning when possible and avoid strenuous outdoor activity during the hottest part of the day. The National Weather Service also recommends lightweight clothing, frequent breaks in shade or air conditioning and checking on relatives and neighbors who may be especially vulnerable to extreme heat.