Flash Flood Warning Issued for Bexar, Comal, and Guadalupe Counties in Texas
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A Flash Flood Warning is in effect until 5:00 PM CDT on April 20, 2026, for Bexar, Comal, and Guadalupe counties in south central Texas, where heavy rain is causing life-threatening flooding.
What this NWS weather alert tells you, and what most readers miss
This notice was issued by NOAA on April 28, 2026 and geographically references South Central Texas. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Weather Alerts - determines the warning protocol behind it, which shapes what protective action (seeking shelter, following evacuation orders if issued, monitoring official updates) is recommended and which agency holds authority to issue or cancel it.
Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action, a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.
For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (weather, alert, Flash Flood Warning, Texas) map to related alerts in the same area of risk - browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.
Flash Flood Warning
Alert Details
The alert is a Flash Flood Warning, issued by NWS Austin/San Antonio TX. It is effective from 1:50 PM CDT on April 20, 2026, until 5:00 PM CDT on the same day.
Affected Areas
The warning affects Bexar County, TX; Comal County, TX; and Guadalupe County, TX. Specific locations include San Antonio, New Braunfels, Schertz, Cibolo, Converse, Universal City, Live Oak, Selma, Randolph AFB, San Antonio Int Airport, Kirby, Alamo Heights, Windcrest, Terrell Hills, Bulverde, Garden Ridge, Shavano Park, Hollywood Park, McQueeney, and Olmos Park.
What You Should Do
Turn around, don't drown when encountering flooded roads. Be aware of your surroundings and do not drive on flooded roads. Stay away or be swept away from river banks and culverts.
Expected Conditions
Thunderstorms are producing heavy rain, with between 1 and 3 inches of rain already fallen and additional rainfall amounts of 1 to 2 inches possible. This is leading to life-threatening flash flooding of creeks and streams, urban areas, highways, streets, and underpasses.
Timeline
The alert is effective from 1:50 PM CDT on April 20, 2026, and ends at 5:00 PM CDT on April 20, 2026.
Original source: NOAA Official Notice ↗
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