Right now
The most recent data we hold from NOAA arrived 3 minutes 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 18:15 UTC. It is kept here as a record.
It is the 9th strongest of the 27 detections recorded within 20 km of this point since 20 May 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 23 at 12:15PM CDT until May 23 at 1:15PM CDT by NWS Houston/Galveston TX
An estimated 88,286 people live within 50 km of this point.
Nearby, since 20 May 2026
- July 6, 2026 · score 43 · 3.9 km
- July 23, 2026 · score 39 · 4.9 km
- June 19, 2026 · score 43 · 6.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 84 % 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) | 39 / 100 |
| Our confidence | 84% |
| Coordinates | 29.6425, -94.2163 |
| Nearest City | Port Arthur (38 km) |
| Population Exposed | 88.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-23T17:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.8fd86ff941d3d9a271d5f870ecf163c7 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Galveston Bay; Coastal waters from High Island to Freeport TX out 20 NM; Coastal waters from Cameron LA to High Island TX out 20 NM; Coastal waters from Intracoastal City to Cameron LA out 20 NM |
| Headline | Special Marine Warning issued May 23 at 12:15PM CDT until May 23 at 1:15PM CDT by NWS Houston/Galveston TX |
| Expires | 2026-05-23T13:15:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8fd86ff941d3d9a271d5f870ecf163c72a376759.001.1","noaa_urn:oid:2.49.0.1.840.0.caa000b96795080cabdee95d3d4b1b082d4414f4.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 67 |
| Iem Unit | MPH |
| Iem City | 4 NNE San Leon |
| Iem County | GMZ335 |
| Iem State | TX |
| Iem Wfo | HGX |
| Iem Remark | Mesonet station XGAL Galveston Bay. |
| MergedSources | [{"id":"iem_M_29.540_-94.910_1779536640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779536640000,"latitude":29.54,"longitude":-94.91}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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