June 4, 2025
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Flash Flood Warning in San Antonio: What’s Happening Right Now and How to Stay Safe

Annie

New York: If you’re in or around San Antonio this morning, there’s a good chance you’ve already heard the alerts, seen water covering the streets, or experienced power flickers. As of May 28, 2025, the National Weather Service has issued a Flash Flood Warning for multiple areas in and around Bexar County, including metro San Antonio.

Storms rolled in overnight, and by dawn, streets were underwater, low crossings were shut down, and thousands of homes had lost power. If you’re just waking up, this is not the day to “wait it out”—this storm is active, ongoing, and dangerous.

Official Flash Flood Warning from the National Weather Service

According to the Austin/San Antonio NWS, the Flash Flood Warning is in effect until 7 AM CDT for:

  • Eastern Bandera County
  • Northwestern Bexar County
  • Kendall County
  • Southeastern Kerr County
  • Northeastern Medina County
  • Areas Currently Affected:
  • San Antonio, Leon Valley, Helotes, Boerne, Kerrville, Bandera, Fair Oaks Ranch, Pipe Creek, and nearby communities.

NWS Warning Summary:

  • Hazard: Life-threatening flash flooding from thunderstorms
  • Rainfall: 1 to 3 inches already reported
  • Impact: Urban areas, highways, streams, and creeks at risk of flooding
  • Advice: “Turn around, don’t drown. Most flood deaths occur in vehicles.”
  • Radar and gauge data confirm several low-water crossings are already impassable.

Power Outages and Road Closures: What You Need to Know

CPS Energy is reporting widespread power outages in the San Antonio area. Damage from the storm has knocked out electricity in neighborhoods across North Side, Castle Hills, Leon Valley, and parts of I-35.

Road Closures (as of 6:00 AM CDT):

  • SE Military Dr underpass
  • Blanco Rd near Wurzbach Pkwy
  • Loop 410 low-water crossings
  • Scenic Loop Rd in Helotes
  • Residential streets near Leon Valley and Pipe Creek

What to Do During a Flash Flood

It’s easy to underestimate flooding—until you’re stuck on a submerged road. Take a few quick actions now:

  • Don’t drive through standing water
  • Charge phones and power banks
  • Follow @NWSSanAntonio & @CPSenergy on Twitter/X
  • Keep a flashlight handy
  • Have a go-bag ready with clothes, ID, and essentials
  • Text your group chats to check in

Remember: floods can rise fast and silently, especially at night.