Texas Severe Extreme Heat Warning | Effective 06/18/2026 18:10
* WHAT...Dangerously hot conditions with peak heat index values
ranging between 112-121F degrees is expected.
* WHERE...All of Deep South Texas, excluding the island.
* WHEN...From noon to 7 PM CDT Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.
* ADDITIONAL DETAILS...While overnight heat indices will not meet
Extreme Heat Warning or Heat Advisory criteria, there will be
little relief from the heat. Heat indices are expected to remain