May 9, 2021
Warm, humid, and unstable conditions were in place across the Four State Region on May 9th, ahead of a cold front and attendant shortwave trough that traversed the Southern Plains during the afternoon. Large scale forcing ahead of the trough increased during the afternoon, with scattered showers and thunderstorms developing near and ahead of the front across Southwest Arkansas, North Louisiana, and East Texas. Moderate instability and adequate wind shear contributed to the development of strong
Source: NOAA National Weather Service Storm Events Database (event 948585). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in San Augustine County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.