Heat — Coastal Willacy, Texas

2023-09-04 · Coastal Willacy, Texas

Event narrative

The Cameron County Airport ASOS reported a heat index of 111 by 11:53 AM CDT, with 111 or higher values persisting until approximately 4:53 PM CDT on September 4th. By proxy, it can be inferred that Coastal Willacy County also received five hours of heat index of 111 or higher.

Wider weather episode

The record breaking summer of 2023 just won't give up as high heat and humidity continued to impact the Rio Grande Valley and Deep South Texas in early September. Southerly flow enhanced by a weak upper trough embedded in the larger La Canicula ridge pushed high humidity into the region, surging heat index to or above 111 degrees for several hours each afternoon from the end of Labor Day through the middle of that week.

Source: NOAA Storm Events Database, event_id 1142703. Narrative written by the NWS forecast office that issued the report.