San Antonio storms trigger widespread outages and flash flood warnings

Heavy storms moved through San Antonio on June 15, knocking out power to more than 10,000 CPS Energy customers at the peak and triggering flash flood warnings across parts of Bexar County.

The weather quickly turned into a public-safety issue as rainwater flooded streets, delayed repairs and forced emergency crews to respond to rescue calls. Local reports said the outage total later dropped sharply, but officials still warned that hazardous conditions could slow restoration work.

CPS Energy said flooded roads and other dangerous conditions could delay repairs and that crew safety remained the top priority. The utility also delayed opening its customer walk-in centers until noon because of the storm.

Storm impact

The hardest-hit outage clusters were on the North, Northwest and West sides of San Antonio, according to the Express-News. At the peak, more than 10,300 customers were without power.

By late morning, one report said the outage total had fallen to fewer than 500 customers. That decline suggested repairs were moving, but officials cautioned that additional flooding or road problems could still interrupt work.

The National Weather Service issued flash flood warnings for parts of the San Antonio area during the storm and kept a broader flood watch in effect for South-Central Texas through Tuesday evening. In one warning set, the San Antonio River near Elmendorf was forecast to rise above flood stage overnight.

The warning footprint was not limited to one neighborhood. Weather alerts and local coverage pointed to dangerous conditions across the city and surrounding county, where heavy rain can overwhelm drainage systems and quickly turn low-water crossings and underpasses into hazards.

Roads and rescues

Travel was heavily affected. Local reporting said about 40 roads were closed across Bexar County as floodwaters covered streets and made routes unsafe for drivers.

The San Antonio Fire Department responded to 20 high-water rescue calls and investigations, according to MySA. That account said there were no hospital transports or significant injuries reported.

One Loop 410 closure near Jackson Keller Road was tied to a high-water rescue and later reopened, underscoring how fast the storm disrupted major commuter routes.

The closures and rescues added urgency to the weather alerts. Officials repeatedly warned that flooded streets, underpasses and low-water crossings could become life-threatening even when the rain itself seemed to ease.

What officials were watching

The immediate questions were how quickly power could be restored, whether additional rainfall would extend the flooding threat and whether more rescues or road closures would follow as the system moved through the region.

CPS Energy said it was prioritizing worker safety while restoring service, and the National Weather Service continued to watch river levels and flood potential across South-Central Texas.

San Antonio is especially vulnerable to fast-moving flood events because intense rain can overwhelm drainage systems with little warning. That makes the combination of outages, road closures and rescue calls particularly disruptive for residents and commuters.

Officials were also monitoring whether warnings would be extended or allowed to expire as conditions changed. The flash flood warning timelines varied by location and update time, but both were consistent with the same storm system and different warning polygons across the region.

For now, the storm had already left behind the most immediate effects: widespread outages, dangerous roads and an emergency response stretched by flooding in multiple parts of the San Antonio area.