This alert expired on 21 June 2026 at 13:30 UTC. It is kept here as a record.
No stronger detection stands among the 5 recorded within 20 km of this point since 23 May 2026 — 3 others scored the same. 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 June 21 at 6:28AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX
An estimated 17,598 people live within 50 km of this point.
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 86 % 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) | 34 / 100 |
| Our confidence | 86% |
| Coordinates | 28.7905, -95.9273 |
| Nearest City | Bay City (21 km) |
| Population Exposed | 17.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T11:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.29859bb1fb8bc9d35ac112722c812b14 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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 Freeport to Matagorda Ship Channel TX from 20 to 60 NM; Galveston Bay; Coastal waters from High Island to Freeport TX out 20 NM; San Antonio, Mesquite, and Espiritu Santo Bays; Coastal waters from Baffin Bay to Port Aransas out 20 NM; Coastal waters from Port Aransas to Matagorda Ship Channel out 20 NM; Waters from Baffin Bay to Port Aransas from 20 to 60 NM; Waters from Port Aransas to Matagorda Ship Channel from 20 to 60 NM |
| Headline | Special Marine Warning issued June 21 at 6:28AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-06-21T08:30:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.29859bb1fb8bc9d35ac112722c812b14f0073677.001.1","noaa_urn:oid:2.49.0.1.840.0.ebb0e290a8c7eb2334677288403b241a52ee8958.001.1","noaa_urn:oid:2.49.0.1.840.0.72658802650a8e41bbda1fa40a55dcd756fc17fd.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 39 |
| Iem Unit | MPH |
| Iem City | 16 ESE Palacios |
| Iem County | GMZ350 |
| Iem State | TX |
| Iem Wfo | HGX |
| Iem Remark | Matagorda bay mesonet site measured a 34 knot wind gust. |
| MergedSources | [{"id":"iem_M_28.580_-96.010_1782037260000","source":"iem","severity":"low","severityValue":25,"timestamp":1782037260000,"latitude":28.58,"longitude":-96.01}] |
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 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 34/100, near Bay City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.