Oct 1, 2021
The combination of an upper level disturbance crossing the southern Great Plains, upper level wind and a low level low pressure system moving east from Nuevo Leon, Mexico, and prior boundaries from earlier thunderstorms north of the Rio Grande Valley and from morning thunderstorms along the coast combined with deep atmospheric tropical moisture to create a thunderstorm system, including a heavy-precipitation supercell event. Measured and estimated rainfall of 4 to 8 inches in just two hours or s
Source: NOAA National Weather Service Storm Events Database (event 978522). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Willacy County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.