Right now
The most recent data we hold from NOAA arrived 23 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 21 June 2026 at 11:45 UTC. It is kept here as a record.
No stronger detection stands among the 9 recorded within 20 km of this point since 19 May 2026 — 4 others scored the same. The last comparable one was on 27 May 2026.
What the source measured
NOAA reported: Special Marine Warning issued June 21 at 5:47AM CDT until June 21 at 6:45AM CDT by NWS Houston/Galveston TX
Urban PEI: 17,598 within a heuristic 50 km radius; not unique people.
Nearby, since 19 May 2026
- June 21, 2026 · score 34 · 6.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 28.7656, -95.9842 |
| Nearest City | Bay City (24 km) |
| Urban exposure index (PEI) | 17.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T10:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ebb0e290a8c7eb2334677288403b241a |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-21T10:47:00.000Z.
First archived: 2026-06-21T11:28:40.246Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
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; Matagorda Bay; Coastal waters from Freeport to Matagorda Ship Channel 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 5:47AM CDT until June 21 at 6:45AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-06-21T06:45:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ebb0e290a8c7eb2334677288403b241a52ee8958.001.1","noaa_urn:oid:2.49.0.1.840.0.47bea30ab4e834872f548e33963fd00cc3b2dfd0.001.1","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 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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens near Bay City?