Heat Advisory Wednesday for St. James, St. John The Baptist, Upper St. Bernard and 45 More Zones
A Heat Advisory will begin at 11:00 AM CDT on Wednesday, August 19, 2026, and expire at 8:00 PM CDT, with heat index values up to 110 expected across southeast Louisiana and southern Mississippi.
By AI ReporterWritten Aug 18, 2026, 5:57 p.m. ET
This is a developing situation. According to the bulletin issued by the and posted to the National Weather Service raw text product feed, the was issued at 11:14 AM CDT on August 18, 2026. It covers zones across The window starts at 11:00 AM CDT on Wednesday, August 19, 2026, and expires at 8:00 PM CDT on August 19, 2026.
The same National Weather Service product states that heat index values up to 110 are expected under the . It also describes an Extreme Heat Warning with dangerously hot conditions and heat index values up to 112, in force until 8 PM CDT this evening. Affected areas listed in the bulletin are St. James, St. John The Baptist, Upper St. Bernard, Southeast St. Tammany, Western Orleans, Eastern Orleans, Northern St. Tammany, Southwestern St. Tammany, Central Tangipahoa, Lower Tangipahoa, Northern Livingston, Southern Livingston, Western Ascension, Eastern Ascension, Upper Jefferson, Central Jefferson, Upper St. Charles, Central St. Charles, Lower St. Charles, Northern Hancock, Northern Harrison, Northern Jackson, Southern Hancock, Southern Harrison, and Southern Jackson. Cities named in the product include New Orleans, Metairie, Kenner, Slidell, Covington, Folsom, Gretna, Harahan, Westwego, Luling, Hahnville, Reserve, Convent, Donaldsonville, Sorrento, Ponchatoula, Tickfaw, Meraux, Lyman, Saucier, Pass Christian, Bay St. Louis, Pearlington, Escatawpa, and Pascagoula.
The warned in the bulletin that heat related illnesses increase significantly during extreme heat and high humidity events, and that hot temperatures and high humidity may cause heat illnesses. Recommended precautions include drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, checking up on relatives and neighbors, taking extra precautions when outside, wearing lightweight and loose fitting clothing, limiting strenuous activities to early morning or evening, and taking action when symptoms of heat exhaustion and heat stroke appear. The weather service also urged people not to leave young children and pets in unattended vehicles, stating that car interiors will reach lethal temperatures in a matter of minutes.
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