Right now
The most recent data we hold from NOAA arrived 21 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 12 June 2026 at 01:30 UTC. It is kept here as a record.
It is the 712th strongest of the 764 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 30 May 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 7:57PM EDT until June 11 at 9:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 3,871,331 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- July 4, 2026 · score 52 · 2.5 km
- August 6, 2026 · score 66 · 5.1 km
- August 3, 2026 · score 58 · 6.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 38.7480, -76.7968 |
| Nearest City | Clinton (9 km) |
| Urban exposure index (PEI) | 3.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.99e74e3a566543097611c324122487ae |
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: 2026-06-11T23:57:00.000Z.
First archived: 2026-06-12T00:04:01.918Z. 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 | Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD |
| Headline | Special Marine Warning issued June 11 at 7:57PM EDT until June 11 at 9:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-11T21:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.99e74e3a566543097611c324122487ae2d2635d2.001.1","noaa_urn:oid:2.49.0.1.840.0.2fdaba90ad0a21fce5468b9b9b61daeb1a07e4cc.001.1","noaa_urn:oid:2.49.0.1.840.0.e78824aa55bf13f765fd7661a2df7fe224c27f2e.001.1"] |
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.
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