Every severe weather report published for St. James, Louisiana, newest first.
Heat index values up to 111 degrees expected from 11 AM to 8 PM CDT across 49 zones in southeast Louisiana and southern Mississippi, the National Weather Service says.
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.
Official weather records warn that extreme heat and high humidity will significantly increase heat-related illnesses across 26 zones in Louisiana and Mississippi.
The National Weather Service alert record for New Orleans lists heat index values up to 110 under the advisory, which runs from 11 AM to 8 PM CDT Tuesday, and up to 115 under an Extreme Heat Warning in force until 8 PM CDT this evening.
An Extreme Heat Warning is in effect on August 17, 2026, with heat index values expected up to 115.
An Extreme Heat Watch issued by the National Weather Service now runs through 8:00 PM CDT on August 17, 2026.
The National Weather Service has issued an Extreme Heat Warning for August 16, 2026, with heat index values expected to reach up to 115.