This alert expired on 20 June 2026 at 19:45 UTC. It is kept here as a record.
No stronger detection stands among the 32 recorded within 20 km of this point since 16 March 2026 — 8 others scored the same. The last comparable one was on 27 May 2026.
What the source measured
NOAA reported: Flash Flood Warning issued June 20 at 12:43PM CDT until June 20 at 2:45PM CDT by NWS Houston/Galveston TX
An estimated 3,322,175 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 1, 2026 · score 52 · 9.3 km
- March 16, 2026 · score 52 · 11.8 km
- July 22, 2026 · score 52 · 14.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % 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) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 29.6114, -95.0357 |
| Nearest City | La Porte (7 km) |
| Population Exposed | 3.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T17:43:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Galveston, TX; Harris, TX |
| Headline | Flash Flood Warning issued June 20 at 12:43PM CDT until June 20 at 2:45PM CDT by NWS Houston/Galveston TX |
| Expires | 2026-06-20T14:45:00-05:00 |
| 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 52/100, near La Porte (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.