⚠️ Extreme Heat Watch – Zapata; Jim Hogg; Brooks; Inland Kenedy; Starr; Southern Hidalgo; Inland Willacy; Inland Cameron; Coastal Kenedy; Northern Hidalgo; Coastal Willacy; Coastal Cameron – Thursday, June 18, 2026

Extreme Heat Watch issued June 18 at 10:31AM CDT until June 19 at 8:00PM CDT by NWS Brownsville TX

Details

* WHAT…For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 124 expected. For the Extreme Heat
Watch, dangerously hot conditions with heat index values up to 120
possible.

* WHERE…All of Deep South Texas, excepting the barrier islands

* WHEN…For the Extreme Heat Warning, until 8 PM CDT this evening.
For the Extreme Heat Watch, from Friday morning through Friday
evening.

* 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
above 90 degrees tonight. Continue to stay hydrated, use air
conditioning when possible (or stay with a friend or family member
who has air conditioning), and check on those who may be more
vulnerable to the 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 and 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.

Stay cool, stay hydrated, stay informed.

If you do not have air conditioning in your home or lack shelter, you
can call 211 or visit http://www.211texas.org for assistance locating
appropriate shelter from the heat.

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