Heat — Southern Hidalgo County, Texas

2025-06-12 · Southern Hidalgo County, Texas

Event narrative

The Automated Surface Observing System (ASOS) at McAllen/Miller Airport recorded a peak heat index value of 113.8F at 453 PM CDT, with a nearly three hour period with values at or above 111F. The South Texas International Airport, 11 miles north-northeast of Edinburg, recorded a peak value of 112.2 at 515 PM CDT, with 2 hours (215 through 415 PM CDT) of 111F or higher.

Locations in Cameron County fell just shy of local criteria (111) that day.

Wider weather episode

The approach of a dissipating front helped import ample low-level moisture into the lower and mid Rio Grande Valley between June 8-12, with heat index values peaking on the 12th. The unstable airmass fueled an approaching area of thunderstorms, which blossomed into a combination of severe (wind damage and hail) and nuisance flooding in Hidalgo County that evening.

Source: NOAA Storm Events Database, event_id 1278837. Narrative written by the NWS forecast office that issued the report.