Right now
The most recent data we hold from NOAA arrived 1 minute 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 18 July 2026 at 21:30 UTC. It is kept here as a record.
It is the 9th strongest of the 141 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 July 18 at 5:03PM EDT until July 18 at 5:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 88,919 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 23, 2026 · score 63 · 2.1 km
- September 4, 2026 · score 32 · 4.4 km
- July 18, 2026 · score 58 · 5.3 km
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 | 38.7332, -75.5568 |
| Nearest City | Salisbury (42 km) |
| Urban exposure index (PEI) | 88.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T21:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ddbdc7af3743affbdd9538ef342d190f |
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: 2026-07-18T21:03:00.000Z.
First archived: 2026-07-18T21:09:44.680Z. 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 north of Pooles Island MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Cobb Island MD to Smith Point VA; Tangier Sound and the inland waters surrounding Bloodsworth Island; Tidal Potomac from Cobb Island MD to Smith Point VA and 5 more areas |
| Headline | Special Marine Warning issued July 18 at 5:03PM EDT until July 18 at 5:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-18T17:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ddbdc7af3743affbdd9538ef342d190f839a2e01.002.1","noaa_urn:oid:2.49.0.1.840.0.0dd8de1591c3fb2c77b2dda9d24bd9316f6d7791.001.1","noaa_urn:oid:2.49.0.1.840.0.d08fa135c40850b6ce7685525f4dd4b440152893.001.1","noaa_urn:oid:2.49.0.1.840.0.d2e08b8a742dc7c2b6e9e8a70cc680622110a4ab.001.1","noaa_urn:oid:2.49.0.1.840.0.dcce80d82dc1904e372a48b83e82eeec2e311340.001.1","noaa_urn:oid:2.49.0.1.840.0.33d4212411aafae36610c8f12972a59bbf33eeab.001.1","noaa_urn:oid:2.49.0.1.840.0.186b964397d3733889338b8592079309559b7851.001.1","noaa_urn:oid:2.49.0.1.840.0.be3478eadb88a081011033e4a4f162d12c064704.001.1"] |
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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