Right now
The most recent data we hold from NOAA arrived 64 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 20 May 2026 at 07:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 10 detections recorded within 20 km of this point since 1 May 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 20 at 12:47AM CDT until May 20 at 2:45AM CDT by NWS Houston/Galveston TX
An estimated 46,962 people live within 50 km of this point.
Nearby, since 1 May 2026
- May 20, 2026 · score 39 · 19.9 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 91% |
| Coordinates | 28.8047, -95.4739 |
| Nearest City | Lake Jackson (25 km) |
| Population Exposed | 47.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T05:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.b0e5adeb75bd6ded3ca45d7cea728070 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Matagorda Bay; Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM; Coastal waters from High Island to Freeport TX out 20 NM; Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM; Waters from High Island to Freeport TX from 20 to 60 NM; Matagorda Bay; Galveston Bay; Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM; Coastal waters from High Island to Freeport TX out 20 NM; Waters from High Island to Freeport TX from 20 to 60 NM |
| Headline | Special Marine Warning issued May 20 at 12:47AM CDT until May 20 at 2:45AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-05-20T02:45:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b0e5adeb75bd6ded3ca45d7cea728070af60474c.001.1","noaa_urn:oid:2.49.0.1.840.0.27faf1fe83728d8c321c96fc60829d5ad3869f4a.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 39 |
| Iem Unit | MPH |
| Iem City | 11 NE Surfside Beach |
| Iem County | Brazoria |
| Iem State | TX |
| Iem Wfo | HGX |
| Iem Remark | Mesonet station 093CE 33 San Luis Pass South. |
| MergedSources | [{"id":"iem_M_29.140_-95.040_1779252600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779252600000,"latitude":29.14,"longitude":-95.04},{"id":"iem_M_29.060_-95.140_1779254400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779254400000,"latitude":29.06,"longitude":-95.14}] |
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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