Right now
The most recent data we hold from NOAA arrived 74 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 2 August 2026 at 19:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 259 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 1 August 2026. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 2 at 2:22PM EDT until August 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 2,190,408 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 22, 2026 · score 52 · 4.6 km
- March 20, 2026 · score 52 · 4.7 km
- September 4, 2026 · score 46 · 5.3 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 66 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 | Critical |
| Calamity Score (ours) | 66 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 38.7205, -76.5121 |
| Nearest City | Greater Upper Marlboro (24 km) |
| Urban exposure index (PEI) | 2.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-08-02T18:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.c08c99a7509b76347eecf336878cbd67 |
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: 2026-08-02T18:22:00.000Z.
First archived: 2026-08-02T18:41:38.879Z. 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 north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD |
| Headline | Special Marine Warning issued August 2 at 2:22PM EDT until August 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-02T15:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c08c99a7509b76347eecf336878cbd676671bf2a.001.1","noaa_urn:oid:2.49.0.1.840.0.c504d5679a58a411e062cefd83400f1dfd1a0df5.001.1"] |
| Ogimet StationId | 72503 |
| Ogimet WindSpeed | 84 |
| Ogimet WindUnit | knots |
| Ogimet TemperatureUnit | C |
| Ogimet RawSynop | 08,02,18,00,AAXX 02184 72503 NIL= |
| MergedSources | [{"id":"ogimet_72503_1785695050944","source":"ogimet","severity":"critical","severityValue":90,"timestamp":1785695050944,"latitude":38.9,"longitude":-77}] |
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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