May 12, 2015
A frontal boundary stalled north of the South Texas region during the morning hours on May 11th. Scattered thunderstorms developed in the afternoon over the Brush Country. A supercell thunderstorm was nearly stationary over southern Duval County for several hours. This caused flash flooding in the evening. A strong upper level disturbance moved out of northern Mexico during the evening hours. A mesoscale convective system developed over the higher terrain in northeast Mexico in the evening hours
Source: NOAA National Weather Service Storm Events Database (event 578496). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Calhoun County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.