⚠️ Extreme Heat Warning – Williamson; Hays; Travis; Bastrop; Lee; Uvalde; Medina; Bexar; Comal; Guadalupe; Caldwell; Fayette; Maverick; Zavala; Frio; Atascosa; Wilson; Karnes; Gonzales; De Witt; Lavaca; Dimmit – Wednesday, June 17, 2026

Extreme Heat Warning issued June 17 at 12:01AM CDT until June 18 at 8:00PM CDT by NWS Austin/San Antonio TX

Details

* WHAT…Dangerously hot conditions with heat index values up to 115
expected.

* WHERE…The I-35 Corridor, Coastal Plains, and southern Rio Grande
Plains.

* WHEN…From noon to 8 PM CDT Thursday.

* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events.

* ADDITIONAL DETAILS…Little in the way of extreme heat has been
observed so far this
Summer. The risk will be higher with little time to adjust to the
extreme heat.

Instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

Do not leave young children or pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.