This alert expired on 20 June 2026 at 23:15 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued June 20 at 3:12PM CDT until June 20 at 6:15PM CDT by NWS Houston/Galveston TX
An estimated 600,880 people live within 50 km of this point.
Nearby, since 20 June 2026
- June 21, 2026 · score 43 · 17.9 km
- August 28, 2026 · score 48 · 19.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 77 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 77% |
| Coordinates | 29.2778, -95.6322 |
| Nearest City | Angleton (23 km) |
| Population Exposed | 600.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T20:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.df4d4706dfeea1992c83e333c26520494b77ac75.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Brazoria, TX; Fort Bend, TX |
| Headline | Flash Flood Warning issued June 20 at 3:12PM CDT until June 20 at 6:15PM CDT by NWS Houston/Galveston TX |
| Expires | 2026-06-20T18:15:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 48/100, near Angleton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.