This alert expired on 20 May 2026 at 08:00 UTC. It is kept here as a record.
It is the 7th strongest of the 31 detections recorded within 20 km of this point since 21 April 2026. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 19 at 10:25PM CDT until May 20 at 3:00AM CDT by NWS Austin/San Antonio TX
An estimated 731,682 people live within 50 km of this point.
Nearby, since 21 April 2026
- September 2, 2026 · score 54 · 6.4 km
- April 21, 2026 · score 52 · 8.6 km
- May 21, 2026 · score 48 · 8.9 km
How we know
Confirmed by 17 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 91% |
| Coordinates | 30.7445, -97.5892 |
| Nearest City | Georgetown (15 km) |
| Population Exposed | 731.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T03:25:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.7079133866716ce9a677ecfbcc3bd80d |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Williamson, TX |
| Headline | Flash Flood Warning issued May 19 at 10:25PM CDT until May 20 at 3:00AM CDT by NWS Austin/San Antonio TX |
| Expires | 2026-05-20T03:00:00-05:00 |
| SenderName | NWS Austin/San Antonio TX |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7079133866716ce9a677ecfbcc3bd80d716d9d3a.001.1","noaa_urn:oid:2.49.0.1.840.0.3c75440287091f4d34fd504f11804e8a6a609746.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 70 |
| Iem Unit | MPH |
| Iem City | 2 ESE Serenada |
| Iem County | Williamson |
| Iem State | TX |
| Iem Wfo | EWX |
| Iem Remark | Amateur Radio report at SH 130 & I-35 under the SH 130 overpass near Georgetown, had street lights and several signs blown over. Raining completely horizontal, about 70MPH. |
| Google News RssFeed | weather |
| Google News SourceName | Austin American-Statesman |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Georgetown?
Calamity.live data shows a weather event with CalamityScore 48/100, near Georgetown (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.