Heat Update: July 21, 2025

Good morning Tangi,

Here is an update concerning the heat threat again today. More advisories will likely be needed over the next couple of days.

WHAT: Potentially dangerous heat conditions with heat index values up to 110 degrees

WHEN:  From 10 a.m. through 7 p.m.

WHERE:  Most of southeast LA and southern MS, excluding the Louisiana coast

CONFIDENCE: We are confident hot temperatures and high humidity will occur today and could quickly lead to heat illness if precautions aren’t taken.

Impacts:

  • Heat index readings are forecast to climb above 108 degrees for multiple hours.
  • With heat index values up to 110 degrees, heat illness can occur quickly.
Skip to content