The worst of the heat abated some by mid-August, but the coastal counties continued to experience several hours of Heat Advisory criteria August 18th and 19th.

Heat in BROOKS, TEXAS
From 18-AUG-23 15:15:00 to 18-AUG-23 17:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 4:15 PM CDT, with 111 or higher values persisting until approximately 6:15 PM CDT on August 18th.

Heat in BROOKS, TEXAS
From 19-AUG-23 14:15:00 to 19-AUG-23 16:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport AWOS reported a heat index of 111 by 3:15 PM CDT, with 111 or higher values persisting until approximately 5:15 PM CDT on August 19th.

Heat in CAMERON, TEXAS
From 18-AUG-23 11:53:00 to 18-AUG-23 14:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Brownsville-South Padre International ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 3:53 PM CDT on August 18th.

Heat in CAMERON, TEXAS
From 19-AUG-23 10:53:00 to 19-AUG-23 15:52:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Harlingen-Valley International Airport ASOS reported a heat index of 111 by 1:52 PM CDT, with 111 or higher values persisting until approximately 4:52 PM CDT on August 19th. The Brownsville-South Padre International ASOS reported a heat index of 111 by 11:53 AM CDT, with 111 or higher values persisting until approximately 3:53 PM CDT on August 19th.

Heat in WILLACY, TEXAS
From 19-AUG-23 12:30:00 to 19-AUG-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

By proxy with nearby ASOS, AWOS, and Texas Water Development Board Mesonet sites, it is realistic to interpolate heat index values between 111 and 115 degrees across inland Willacy County during the afternoon of August 19th. Slightly lower values are common here compared with locations in Kenedy and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in COASTAL CAMERON, TEXAS
From 18-AUG-23 11:53:00 to 18-AUG-23 13:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 2:53 PM CDT on August 18th. By proxy, it can be assumed that Coastal Willacy County had similar conditions.

Heat in WILLACY, TEXAS
From 18-AUG-23 13:00:00 to 18-AUG-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

By proxy with nearby ASOS, AWOS, and Texas Water Development Board Mesonet sites, it is realistic to interpolate heat index values between 111 and 115 degrees across inland Willacy County during the afternoon of August 18th. Slightly lower values are common here compared with locations in Kenedy and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in COASTAL KENEDY, TEXAS
From 18-AUG-23 11:53:00 to 18-AUG-23 13:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 2:53 PM CDT on August 18th. By proxy, it can be assumed that Coastal Kenedy County had similar conditions.

Heat in INLAND KENEDY COUNTY, TEXAS
From 18-AUG-23 13:00:00 to 18-AUG-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Water Development Board Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 111 degrees between 2:00PM CDT and 4:00PM CDT the afternoon of August 18th.

Heat in INLAND KENEDY COUNTY, TEXAS
From 19-AUG-23 12:30:00 to 19-AUG-23 15:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Water Development Board Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 111 degrees between 1:30PM CDT and 4:00PM CDT the afternoon of August 18th.

Heat in COASTAL CAMERON, TEXAS
From 18-AUG-23 11:53:00 to 18-AUG-23 13:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 12:53 PM CDT, with 111 or higher values persisting until approximately 2:53 PM CDT on August 18th.

Heat in COASTAL CAMERON, TEXAS
From 19-AUG-23 09:53:00 to 19-AUG-23 15:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 10:53 AM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on August 19th.

Heat in COASTAL WILLACY, TEXAS
From 19-AUG-23 09:53:00 to 19-AUG-23 15:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 10:53 AM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on August 19th. By proxy, it can be assumed that Coastal Willacy County had similar conditions.

Heat in COASTAL KENEDY, TEXAS
From 19-AUG-23 10:53:00 to 19-AUG-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 by 10:53 AM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on August 19th. By proxy, it can be assumed that Coastal Kenedy County had similar conditions. The Texas Water Development Board location at Sarita (northwest Kenedy) had four hours of similar conditions.