Thunderstorm Wind in Calhoun County, Texas

TCOON site at Port Lavaca measured a gust to 60 mph.

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. The storm complex moved southeast across the Brush Country and into the Coastal Bend during the overnight hours. Flash flooding and damaging winds occurred from Duval County toward the southern Coastal Bend during the morning hours of May 12th. The severe winds caused power outages to as many as twenty five thousand customers across the southern Coastal Bend.