Right now
The most recent data we hold from NOAA arrived 52 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 19 May 2026 at 23:00 UTC. It is kept here as a record.
It is the 9th strongest of the 259 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 6:14PM EDT until May 19 at 7:00PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 3,920,076 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- May 19, 2026 · score 52 · 0.0 km
- March 12, 2026 · score 52 · 0.4 km
- July 5, 2026 · score 66 · 2.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 38.7020, -77.1333 |
| Nearest City | Woodlawn (2 km) |
| Urban exposure index (PEI) | 3.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T22:14:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0aa20cdccbd31e948ff467ba9eb86e56f2dfd27b.001.1 |
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: 2026-05-19T22:14:00.000Z.
First archived: 2026-05-19T22:48:14.825Z. 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 Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued May 19 at 6:14PM EDT until May 19 at 7:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-05-19T19:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 40 |
| Iem Unit | mph |
| Iem City | Reagan National Arpt |
| Iem County | Arlington |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | A wind gust of 35 knots (40 MPH) was measured by the ASOS at Ronald Reagan Washington National Airport (KDCA) adjacent to the tidal Potomac River. |
| Google News RssFeed | weather |
| Google News SourceName | AOL.com |
| MergedSources | [{"id":"iem_M_38.850_-77.030_1779228960000","source":"iem","severity":"low","severityValue":25,"timestamp":1779228960000,"latitude":38.85,"longitude":-77.03},{"id":"gnews_weather_494225_177","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779211847000,"latitude":38.9,"longitude":-77.04}] |
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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