Excessive Heat in Southern Hidalgo County, Texas

McAllen International Airport (KMFE) recorded max heat indices between 111-118F for 7 hours, from 10:53 AM-5:53 PM CDT on May 28, 2024. Excessive heat criteria (116F or higher) were reached from 12:30 PM until approximately 4:45 PM). The South Texas International Airport, 11 miles north of Edinburg and along the north/south Hidalgo County line, recorded 111F of higher heat index values from 1145 AM until 630 PM, with 116F or higher from 2:25 until 5:45 PM.

A slightly stronger sub-tropical ridge/heat dome centered over central and southern Mexico returned northward towards the Rio Grande Valley and Deep South Texas. At five thousand feet above ground, the temperature soared anywhere from 78 to 90 degrees Fahrenheit, which translated into another short-lived but intense heat wave over the region with surface temperatures rising into the upper 90s to mid 100s from May 26-30. The combination of heat and dewpoint temperatures well into the 70s to around 80, heat indices ranged between a sweltering 111F-126F across parts of Deep South Texas and the Rio Grande Valley. The hottest temperatures were once again located from the mid-lower Rio Grande Valley northward along I-69E and I-69C; several hours with values of 116 or higher - considered Excessive Heat - were noted each day in many parts of the region.