Right now
The most recent data we hold from NOAA arrived 4 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 18 July 2026 at 23:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Special Marine Warning issued July 18 at 5:37PM EDT until July 18 at 7:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 88,919 within a heuristic 50 km radius; not unique people.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 38.7466, -75.6460 |
| Nearest City | Easton (38 km) |
| Urban exposure index (PEI) | 88.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T21:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.8e1f44830c14613d19c4f48435bce76e |
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: 2026-07-18T21:37:00.000Z.
First archived: 2026-07-18T21:45:52.424Z. 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 | Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Chesapeake Bay from Smith Point to Windmill Point VA; Chesapeake Bay from Windmill Point to New Point Comfort VA; Rappahannock River from Urbanna to Windmill Point and 6 more areas |
| Headline | Special Marine Warning issued July 18 at 5:37PM EDT until July 18 at 7:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-18T19:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8e1f44830c14613d19c4f48435bce76e1971071d.001.1","noaa_urn:oid:2.49.0.1.840.0.399b4c78a881d15ddf18ec65f75bd9e698606eff.001.1","noaa_urn:oid:2.49.0.1.840.0.c382db7bb9af489869e518dea4918489de4bb4fe.001.1","noaa_urn:oid:2.49.0.1.840.0.0fccf096d86e9da1a85f00f293023e6e3fd0d7d0.001.1","noaa_urn:oid:2.49.0.1.840.0.6b8b7d718da05366a395240003e8dd8d380abbc7.001.1","noaa_urn:oid:2.49.0.1.840.0.186b964397d3733889338b8592079309559b7851.001.1","noaa_urn:oid:2.49.0.1.840.0.0dd8de1591c3fb2c77b2dda9d24bd9316f6d7791.001.1","noaa_urn:oid:2.49.0.1.840.0.be3478eadb88a081011033e4a4f162d12c064704.001.1","noaa_urn:oid:2.49.0.1.840.0.33d4212411aafae36610c8f12972a59bbf33eeab.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.
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