Flash Flood Warning Issued for Central Williamson County, TX

Source: NOAA · Central Williamson County, Texas

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A Flash Flood Warning is in effect for central Williamson County in south central Texas until 3:00 AM CDT due to thunderstorms producing heavy rain and life-threatening flash flooding.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on June 1, 2026 and geographically references Central Williamson County, 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 regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

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, Williamson County) 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.

Alert Details

A Flash Flood Warning has been issued by the National Weather Service in Austin/San Antonio TX. The alert is effective from May 19 at 10:25 PM CDT until May 20 at 3:00 AM CDT.

Affected Areas

Central Williamson County in south central Texas. Locations that will experience flash flooding include Round Rock, Georgetown, Taylor, Granger, Serenada, Hutto, Bartlett, Thrall, Weir, Granger Dam, Georgetown Dam, Sun City, Jonah, Waterloo, Walburg, Hoxie, Sandoval, Laneport and Hare. This includes streams and drainages such as Pecan Branch, Opossum Creek, Weir Branch, Dry Berry Creek, South Fork Mustang Creek, Brushy Creek, North Fork San Gabriel River, South Fork San Gabriel River, Long Branch, Mileham Branch, Berry Creek, Cottonwood Creek, Turkey Creek, Yankee Branch, McNutt Creek, Mustang Creek, Smith Branch, Bull Branch, Cowan Creek, Middle Fork San Gabriel River, Donahoe Creek, San Gabriel River, Willis Creek, Chandler Branch, Alligator Creek and Smalley Branch.

What You Should Do

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads.

Expected Conditions

At 10:25 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 3 inches of rain have fallen. Additional rainfall amounts up to 2 inches are possible. Flash flooding is ongoing or expected to begin shortly.

Timeline

The warning is effective immediately from May 19 at 10:25 PM CDT and remains in effect until May 20 at 3:00 AM CDT.

Original source: NOAA Official Notice ↗

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Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
A Flash Flood Warning is in effect for central Williamson County in south central Texas until 3:00 AM CDT due to thunderstorms producing heavy rain and life-threatening flash flooding.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Central Williamson County, Texas. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.