Excessive Heat in Eastern Ascension Parish, Louisiana

A combination of heat and humidity allowed heat indices to climb into the 113-115 degree range on July 29th, which meet extreme heat conditions.

On July 29th, 2025, excessive heat developed across southeast Louisiana and coastal Mississippi, where heat indices surged into the 113'115F range. The surface analysis showed a weak pressure gradient and high dewpoints pooled across the northern Gulf Coast beneath a sprawling ridge aloft. At 500 mb, broad ridging with heights near 594'596 dm dominated the southern U.S., suppressing convection and reinforcing subsidence, which enhanced compressional heating. This combination of oppressive humidity and stagnant upper-level support allowed dangerous heat stress conditions to persist throughout the day.