Right now
The most recent data we hold from NOAA arrived 7 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 22 July 2026 at 22:00 UTC. It is kept here as a record.
It is the 6th strongest of the 79 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 6 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued July 22 at 4:47PM EDT until July 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 17 March 2026
- June 13, 2026 · score 22 · 6.9 km
- August 2, 2026 · score 22 · 8.8 km
- July 6, 2026 · score 22 · 14.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 38.0504, -76.3430 |
| Nearest City | Salisbury (73 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-22T20:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.3e122a859d8000c22aae137d228659cf |
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: 2026-07-22T20:47:00.000Z.
First archived: 2026-07-22T20:55:17.568Z. 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 Cobb Island MD to Smith Point VA; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; 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; Coastal waters from Chincoteague to Parramore Island VA out 20 NM; Coastal waters from Parramore Island to Cape Charles Light VA out 20 NM; Waters from Chincoteague VA to Parramore Island VA from 20 to 60 NM; Waters from Parramore Island VA to Cape Charles Light VA from 20 to 60 NM |
| Headline | Special Marine Warning issued July 22 at 4:47PM EDT until July 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-22T18:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3e122a859d8000c22aae137d228659cf41b08bef.001.1","noaa_urn:oid:2.49.0.1.840.0.7ee8f012bf61fdccbb46bd9f0ff7bd1e9dfdfeb2.001.1","noaa_urn:oid:2.49.0.1.840.0.27e312e4c6984930856a3eed9ec19e624615a374.001.1"] |
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.
Want to know when something happens in this area?