Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 23 May 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 1 May 2026 — 13 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 23 at 4:20PM CDT until May 23 at 5:45PM CDT by NWS Houston/Galveston TX
An estimated 3,464,752 people live within 50 km of this point.
Nearby, since 1 May 2026
- May 23, 2026 · score 52 · 0.0 km
- June 20, 2026 · score 52 · 6.3 km
- August 28, 2026 · score 52 · 6.5 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 29.4418, -95.2000 |
| Nearest City | Alvin (5 km) |
| Population Exposed | 3.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-23T21:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.31fefc7646eceb49392a4d28bec0ba056d1908fa.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Brazoria, TX; Galveston, TX |
| Headline | Flood Warning issued May 23 at 4:20PM CDT until May 23 at 5:45PM CDT by NWS Houston/Galveston TX |
| Expires | 2026-05-23T17:45:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | Hillcrest |
| Iem County | Brazoria |
| Iem State | TX |
| Iem Wfo | HGX |
| Iem Remark | Estimated 4 inches of water in Hillcrest, TX. |
| MergedSources | [{"id":"iem_M_29.360_-94.720_1779561000000","source":"iem","severity":"low","severityValue":25,"timestamp":1779561000000,"latitude":29.36,"longitude":-94.72},{"id":"iem_W_29.270_-94.820_1779554100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779554100000,"latitude":29.27,"longitude":-94.82},{"id":"iem_F_29.390_-95.220_1779562200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779562200000,"latitude":29.39,"longitude":-95.22}] |
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.
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