Full Breakdown
Severe Thunderstorms Sweep San Antonio, Prompting Flash-Flood Warning and Power Outages
8/29/2026, 11:47:08 AM
Storm Overview
Late Friday night, a line of thunderstorms moved rapidly through San Antonio, bringing gusty winds, heavy rain and flash flooding. The National Weather Service (NWS) issued a Flash Flood Warning for north Bexar County that remained in effect until early Saturday morning. Winds reached near-50 mph at the New Braunfels airport, and lightning was widely reported across the city.
Shift in Weather Pattern
Forecasters explained that a high-pressure ridge that had kept South Texas unusually hot and dry shifted westward toward the New Mexico-Arizona border. This change allowed a disturbance to push south, generating the thunderstorms that struck the area. The NWS noted that while severe storms were not expected, stronger storms could linger overnight, and a sea-breeze may bring additional showers on Friday.
Immediate Impacts
The storms overturned an 18-wheel trailer at Heroes Stadium and caused damage at several gas stations. Over 100,000 CPS Energy customers lost power as strong winds downed trees and utility lines. In addition, flash-flood conditions prompted local authorities to advise residents to avoid low-lying areas.
Official Alerts & Safety Guidance
The NWS flash-flood warning and a heat advisory for Bexar and adjacent counties (effective until 7 p.m.) were both highlighted by local outlets. The City of San Antonio warned that a body temperature of 103 °F accompanied by red, hot skin and little perspiration signals serious heat-related illness. The city advised moving affected individuals into shade or air-conditioned spaces, applying cool water or wet cloths, and awaiting emergency medical services.
These coordinated warnings and the observed damage underscore the rapid transition from a prolonged heat spell to hazardous storm conditions in the San Antonio region.
