The combination of hot to very hot temperatures and high humidity combined to lead to continued excessive heat criteria across much of the Rio Grande Valley and Deep South Texas in mid to late June as a stubborn mid-level area of high pressure (La Canicula, or heat dome) refused to let up.
Local hospitals noted an increase in heat-related emergency room visits during June 2023 when compared with the same period a year earlier, which was also hot but not at the level of 2023.  Percentage increases ranged from 11 to 18 percent more visits during the month of June.  There was little data on direct casualties (injuries or fatalities) from the excessive heat in mid to late June, though there was one indirect death on June 25th in Cameron County.

Excessive Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 19-JUN-23 13:53:00 to 19-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Excessive Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 19th.

Excessive Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 20-JUN-23 15:53:00 to 20-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Excessive Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 20th.

Excessive Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 21-JUN-23 16:53:00 to 21-JUN-23 17:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Excessive Heat criteria due to readings at the McAllen/Miller International Airport, Edinburg International Airport, and Brooks County Airport, all of which reached criteria on June 21st.

Excessive Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 22-JUN-23 14:53:00 to 22-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Excessive Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 22nd.

Excessive Heat in INLAND KENEDY COUNTY, TEXAS
From 20-JUN-23 18:10:00 to 20-JUN-23 18:20:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Waterboard Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 116 degrees between 7:10PM CDT and 7:20PM CDT the afternoon of June 20th. The highest heat index was recorded at 7:10PM CDT of 120 degrees.

Excessive Heat in INLAND KENEDY COUNTY, TEXAS
From 21-JUN-23 14:50:00 to 21-JUN-23 16:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Waterboard Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 116 degrees between 3:50PM CDT and 5:00PM CDT the afternoon of June 21st. The highest heat index was recorded at 3:50PM CDT of 118 degrees.

Heat in JIM HOGG, TEXAS
From 18-JUN-23 13:55:00 to 18-JUN-23 19:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Jim Hogg County Airport AWOS reported a heat index of 111 by 2:55 PM CDT, with 111 or higher values persisting until approximately 8:35 PM CDT on June 18th.

Heat in CAMERON, TEXAS
From 18-JUN-23 11:52:00 to 18-JUN-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 12:52 PM CDT, with 111 or higher values persisting until approximately 4:52 PM CDT on June 18th. The Brownsville-South Padre International ASOS reported a heat index of 111 by 1:53 PM CDT, with 111 or higher values persisting until approximately 3:53 PM CDT.

Heat in COASTAL CAMERON, TEXAS
From 22-JUN-23 10:53:00 to 22-JUN-23 12:53:00 (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 11:53 AM CDT, with 111 or higher values persisting until approximately 1:53 PM CDT on June 22nd.

Heat in STARR, TEXAS
From 18-JUN-23 13:20:00 to 18-JUN-23 18:40:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 2:20 PM and 7:40 PM CDT. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 110 and heat index between 111 and 119 between 12:11 and 7:11 PM CDT. The time provided is a blend of the two observations, and Starr County overall was likely between 111 and 115 during this window.

Heat in WILLACY, TEXAS
From 22-JUN-23 12:50:00 to 22-JUN-23 16:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

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 for four hours during the afternoon of June 22nd. Slightly lower values are common here compared with locations in Kenedy/Brooks and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in COASTAL WILLACY, TEXAS
From 18-JUN-23 12:30:00 to 18-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Willacy County had at least two hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 18th. Peak values were listed at 113 degrees.  Inland Willacy County, by proxy with the Texas Water Development Board site (TWB67) near Monte Alto, had around five hours with 111 degree or higher heat index values.

Excessive Heat in INLAND KENEDY COUNTY, TEXAS
From 18-JUN-23 16:30:00 to 18-JUN-23 17:20:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Waterboard Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 116 degrees between 5:30PM CDT and 6:20PM CDT the afternoon of June 18th. The highest heat index was recorded at 5:30PM CDT of 122 degrees.

Excessive Heat in INLAND KENEDY COUNTY, TEXAS
From 19-JUN-23 16:00:00 to 19-JUN-23 17:10:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Waterboard Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 116 degrees between 5:00PM CDT and 6:10PM CDT the afternoon of June 19th. The highest heat index was recorded at 5:00PM CDT of 123 degrees.

Excessive Heat in INLAND KENEDY COUNTY, TEXAS
From 22-JUN-23 13:20:00 to 22-JUN-23 13:50:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Waterboard Mesonet site in Sarita (TW100) in northern Kenedy County recorded heat indices reaching or exceeding 116 degrees between 2:20PM CDT and 2:50PM CDT the afternoon of June 22nd. The highest heat index was recorded at 2:30PM CDT of 117 degrees.

Heat in ZAPATA, TEXAS
From 18-JUN-23 12:55:00 to 18-JUN-23 17:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Zapata County Airport AWOS reported a heat index of 111 by 1:55 PM CDT, with 111 or higher values persisting until approximately 6:55 PM CDT on June 18th.

Heat in ZAPATA, TEXAS
From 19-JUN-23 13:55:00 to 19-JUN-23 17:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Zapata County Airport AWOS reported a heat index of 111 by 2:55 PM CDT, with 111 or higher values persisting until approximately 6:15 PM CDT on June 19th.

Heat in CAMERON, TEXAS
From 19-JUN-23 12:52:00 to 19-JUN-23 16:53:00 (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 2:52 PM CDT on June 19th. The Brownsville-South Padre International ASOS reported a heat index of 111 by 1:53 PM CDT, with 111 or higher values persisting until approximately 5:53 PM CDT.

Heat in CAMERON, TEXAS
From 20-JUN-23 11:53:00 to 20-JUN-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 June 20th.

Heat in STARR, TEXAS
From 19-JUN-23 12:11:00 to 19-JUN-23 18:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 6:10 PM and 6:50 PM CDT on June 19th. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 110 and heat index between 111 and 119 between 12:11 and 7:11 PM CDT. The time provided is a blend of the two observations, and Starr County overall was likely between 111 and 115 during this window.

Heat in STARR, TEXAS
From 20-JUN-23 13:11:00 to 20-JUN-23 18:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 6:10 PM and 6:50 PM CDT on June 20th. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 110 and heat index between 111 and 119 between 2:11 and 7:11 PM CDT. The time provided is a blend of the two observations, and Starr County overall was likely between 111 and 115 during this window.

Heat in COASTAL WILLACY, TEXAS
From 19-JUN-23 12:30:00 to 19-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Willacy County had at least two hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 12:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 19th. Peak values were listed at 115 degrees at 453 PM.  Inland Willacy County, by proxy with the Texas Water Development Board site (TWB67) near Monte Alto, had around four hours with 111 degree or higher heat index values.

Heat in COASTAL WILLACY, TEXAS
From 20-JUN-23 12:30:00 to 20-JUN-23 16:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Willacy County had at least three hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 12:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 20th. Peak values were listed at 113 degrees at 1253 PM.  Inland Willacy County, by proxy with the Texas Water Development Board site (TWB67) near Monte Alto, had only around an hour with 111 degree or higher heat index values after the sea breeze arrived late.

Heat in ZAPATA, TEXAS
From 20-JUN-23 15:35:00 to 20-JUN-23 17:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Zapata County Airport AWOS reported a heat index of 111 by 3:35 PM CDT, with 111 or higher values persisting until approximately 6:15 PM CDT on June 20th.

Heat in ZAPATA, TEXAS
From 21-JUN-23 13:35:00 to 21-JUN-23 16:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Zapata County Airport AWOS reported a heat index of 111 by 2:35 PM CDT, with 111 or higher values persisting until approximately 5:35 PM CDT on June 21st.

Heat in ZAPATA, TEXAS
From 22-JUN-23 14:15:00 to 22-JUN-23 15:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Zapata County Airport AWOS reported a heat index of 111 by 3:15 PM CDT, with 111 or higher values persisting until approximately 4:35 PM CDT on June 22nd.

Heat in CAMERON, TEXAS
From 21-JUN-23 13:53:00 to 21-JUN-23 15:53:00 (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 2:53 PM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on June 21st. The Harlingen-Valley International ASOS reported a heat index of 112 at 3:53 PM CDT.

Heat in CAMERON, TEXAS
From 22-JUN-23 08:53:00 to 22-JUN-23 12:53:00 (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 9:53 AM CDT, with 111 or higher values persisting until approximately 1:53 PM CDT on June 22nd. The Harlingen-Valley International ASOS reported a heat index of 113 at 3:52 PM CDT.

Heat in COASTAL CAMERON, TEXAS
From 18-JUN-23 12:30:00 to 18-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Cameron County Airport ASOS reported a heat index of 111 as early as 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 18th.

Heat in STARR, TEXAS
From 21-JUN-23 12:11:00 to 21-JUN-23 17:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 5:10 PM and 5:20 PM CDT on June 21st. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 110 and heat index between 111 and 119 between 2:11 and 6:11 PM CDT. The time provided is a blend of the two observations, and Starr County overall was likely between 111 and 115 during this window.

Heat in STARR, TEXAS
From 22-JUN-23 10:11:00 to 22-JUN-23 18:11:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Mesonet site at Rancho Los Comitas (extreme northern Starr County) recorded heat index values of 111 to 115 generally between 6:40 PM and 6:50 PM CDT on June 22nd. The RAWS site at Falcon Lake, which runs hotter than most locations but is a proxy for locations along the Rio Grande in Starr, had actual temperatures of 110 and heat index between 111 and 119 between 11:11 and 7:11 PM CDT. The time provided is a blend of the two observations, and Starr County overall was likely between 111 and 115 during this window.

Heat in COASTAL WILLACY, TEXAS
From 21-JUN-23 14:30:00 to 21-JUN-23 16:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Willacy County had at least two hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 3:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 21st. Peak values were listed at 114 degrees at 4:53 PM.  Inland Willacy County, by proxy with the Texas Water Development Board site (TWB67) near Monte Alto, had about five  hours with 111 degrees or higher through late afternoon.

Heat in COASTAL WILLACY, TEXAS
From 22-JUN-23 10:30:00 to 22-JUN-23 13:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Willacy County had at least three hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 10:30 AM CDT, with 111 or higher values persisting until approximately 2:30 PM CDT on June 22nd. Peak values were listed at 115 degrees at 4:53 PM.  Inland Willacy County, by proxy with the Texas Water Development Board site (TWB67) near Monte Alto, had about two hours with 111 degrees or higher through mid afternoon.

Heat in COASTAL CAMERON, TEXAS
From 19-JUN-23 11:53:00 to 19-JUN-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 12:53 PM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on June 19th.

Heat in COASTAL CAMERON, TEXAS
From 20-JUN-23 12:53:00 to 20-JUN-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 1:53 PM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on June 20th.

Heat in COASTAL CAMERON, TEXAS
From 21-JUN-23 14:53:00 to 21-JUN-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 3:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 21st.

Heat in WILLACY, TEXAS
From 18-JUN-23 11:52:00 to 18-JUN-23 17:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

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 for six hours during the afternoon of June 18th. Slightly lower values are common here compared with locations in Kenedy/Brooks and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in WILLACY, TEXAS
From 19-JUN-23 12:52:00 to 19-JUN-23 16:53:00 (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 June 19th. Slightly lower values are common here compared with locations in Kenedy/Brooks 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-JUN-23 13:50:00 to 18-JUN-23 18:50:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

It can be assumed that, by proxy, Coastal Kenedy County had up to five hours  of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 1:30 PM CDT, with 111 or higher values persisting until approximately 3:30 PM CDT on June 18th. The Texas Water Development Board mesonet site at Sarita (TW100, Sarita) had around five hours with 111 degree or higher heat index values, including around 1.5 hours of 116 or higher. Lower temperatures near the coast suggest slightly lower peak values, in the Heat vs. Excessive Heat criteria category.

Heat in COASTAL KENEDY, TEXAS
From 19-JUN-23 13:00:00 to 19-JUN-23 18:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

It can be assumed that, by proxy, Coastal Kenedy County had 5 hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 12:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 19th. The Texas Water Development Board mesonet site at Sarita (TW100, Sarita) had around 4.5 hours with 111 degree or higher heat index values between 4 and 730 PM CDT, including around 45 minutes of 116 or higher. Lower temperatures near the coast suggest slightly lower peak values, in the Heat vs. Excessive Heat criteria category.

Heat in WILLACY, TEXAS
From 20-JUN-23 11:53:00 to 20-JUN-23 14:53:00 (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 for about three hours during the afternoon of June 20th. Slightly lower values are common here compared with locations in Kenedy/Brooks and Cameron, due to the populated areas being in a zone of slightly lower, but still dangerous, high temperatures.

Heat in WILLACY, TEXAS
From 21-JUN-23 12:00:00 to 21-JUN-23 17:00:00 (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 114 degrees across inland Willacy County during the afternoon of June 21st between 1 and 6 PM. Slightly lower values are common here compared with locations in Kenedy/Brooks 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 20-JUN-23 12:30:00 to 20-JUN-23 17:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Kenedy County had at least three hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 12:30 PM CDT, with 111 or higher values persisting until approximately 6:30 PM CDT on June 20th. Peak values were listed at 113 degrees at 1253 PM. The Texas Water Development Board site at Sarita (TW100) jumped from below 111 to 117 when the sea breeze arrived at 705 PM CDT, with 111 or higher values continuing until 755 PM CDT.

Heat in COASTAL KENEDY, TEXAS
From 21-JUN-23 14:00:00 to 21-JUN-23 17:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Kenedy County had at least three hours of heat index at or above 111 degrees. The Cameron County Airport ASOS reported a heat index of 111 as early as 3:30 PM CDT, with 111 or higher values persisting until approximately 5:30 PM CDT on June 20th. Peak values were listed at 113 degrees at 1253 PM. The Texas Water Development Board site at Sarita (TW100) jumped from below 111 to 119 degrees when the sea breeze arrived at 3:50 PM CDT, with 111 or higher values continuing until 630 PM CDT.

Heat in COASTAL KENEDY, TEXAS
From 22-JUN-23 09:30:00 to 22-JUN-23 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It can be assumed that, by proxy, Coastal Kenedy County had at least three hours of heat index at or above 111 degrees.  The Cameron County Airport ASOS reported a heat index of 111 as early as 10:30 AM CDT, with 111 or higher values persisting until approximately 2:30 PM CDT on June 22nd. Peak values were listed at 115 degrees at 11:53 AM. The Texas Water Development Board site at Sarita (TW100) reached 111 at 1 PM CDT, but higher values were likely along the coast an hour or two earlier.  jumped from below 111 to 117 degrees when the sea breeze arrived at 2:20 PM CDT, with 111 or higher values continuing until 555 PM CDT.

Excessive Heat in BROOKS, TEXAS
From 18-JUN-23 15:35:00 to 18-JUN-23 17:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport (KBKS) recorded heat indices reaching or exceeding 116 degrees between 4:15PM CDT and 7:35PM CDT the afternoon of June 18th. The highest was recorded at 6:35PM CDT of 119 degrees.

Excessive Heat in BROOKS, TEXAS
From 21-JUN-23 17:15:00 to 21-JUN-23 18:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport (KBKS) recorded heat indices reaching or exceeding 116 degrees between 6:15PM CDT and 7:35PM CDT the afternoon of June 21st. The highest was recorded at 6:35PM CDT of 119 degrees.

Excessive Heat in BROOKS, TEXAS
From 22-JUN-23 14:55:00 to 22-JUN-23 18:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Brooks County Airport (KBKS) recorded heat indices reaching or exceeding 116 degrees between 3:55PM CDT and 7:15PM CDT the afternoon of June 22nd. The highest was recorded at 4:35PM CDT of 121 degrees.

Excessive Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 18-JUN-23 13:53:00 to 18-JUN-23 17:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 116 degrees between 2:53PM CDT and 6:15PM CDT the afternoon of June 18th. The highest heat index was recorded at 4:53PM CDT of 123 degrees. The South Texas International Airport AWOS station (KEBG) recorded a max heat index of 123 degrees at 4:35PM CDT.

Excessive Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 19-JUN-23 13:53:00 to 19-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 116 degrees between 3:53PM CDT and 5:53PM CDT the afternoon of June 19th. The highest heat index was recorded at 3:53PM CDT of 121 degrees. The South Texas International Airport AWOS station (KEBG) recorded a max heat index of 119 degrees at 4:15PM CDT.

Excessive Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 20-JUN-23 15:53:00 to 20-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 116 degrees between 4:53PM CDT and 5:53PM CDT the afternoon of June 20th. The highest heat index was recorded at 5:53PM CDT of 119 degrees. The South Texas International Airport AWOS station (KEBG) recorded a max heat index of 117 degrees at 5:15PM CDT.

Excessive Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 21-JUN-23 16:53:00 to 21-JUN-23 17:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 116 degrees between 5:53PM CDT and 6:53PM CDT the afternoon of June 21st. The highest heat index was recorded at 5:53PM CDT of 117 degrees. The South Texas International Airport AWOS station (KEBG) recorded a max heat index of 117 degrees at 5:55PM CDT.

Excessive Heat in SOUTHERN HIDALGO COUNTY, TEXAS
From 22-JUN-23 14:53:00 to 22-JUN-23 16:53:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The McAllen-Miller International Airport ASOS station (KMFE) recorded heat indices reaching or exceeding 116 degrees between 3:53PM CDT and 4:53PM CDT the afternoon of June 22d. The highest heat index was recorded at 3:53PM CDT of 116 degrees. The South Texas International Airport AWOS station (KEBG) recorded a max heat index of 119 degrees at 3:55PM CDT.

Excessive Heat in NORTHERN HIDALGO COUNTY, TEXAS
From 18-JUN-23 13:53:00 to 18-JUN-23 17:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

It is reasonable to infer that Northern Hidalgo County reached Excessive Heat criteria due to readings at the McAllen-Miller International Airport, South Texas International Airport, and Brooks County Airport, all of which reached criteria on June 18th.