Right now
The most recent data we hold from NOAA arrived 79 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 02:30 UTC. It is kept here as a record.
It is the 95th strongest of the 186 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 8:36PM EDT until June 11 at 10:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 1,058,510 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- March 17, 2026 · score 52 · 2.5 km
- July 22, 2026 · score 52 · 2.9 km
- March 17, 2026 · score 72 · 3.8 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 | 0.79/1 |
| Coordinates | 38.6007, -76.5959 |
| Nearest City | St. Charles (28 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.e134ec8313efc94ee056307236dd5054 |
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: 2026-06-12T00:36:00.000Z.
First archived: 2026-06-12T00:55:28.425Z. 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 Cobb Island MD to Smith Point VA; Chesapeake Bay from North Beach to Drum Point MD; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; Chesapeake Bay from North Beach to Drum Point MD; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD and 3 more areas |
| Headline | Special Marine Warning issued June 11 at 8:36PM EDT until June 11 at 10:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-11T22:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e134ec8313efc94ee056307236dd50541001e0b9.001.1","noaa_urn:oid:2.49.0.1.840.0.4a5c2109cd8a95f4960ff06b2ff8777cc23f3462.001.1","noaa_urn:oid:2.49.0.1.840.0.d99282cf24b30d86566742604a5dc1e7fa146ca4.001.1","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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