Right now
The most recent data we hold from NOAA arrived 6 hours 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 7 June 2026 at 00:00 UTC. It is kept here as a record.
It is the 16th strongest of the 272 detections recorded within 20 km of this point since 11 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: Severe Thunderstorm Watch issued June 6 at 6:04PM EDT until June 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 1,479,586 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- August 28, 2026 · score 58 · 0.0 km
- August 27, 2026 · score 66 · 0.0 km
- July 18, 2026 · score 64 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.80/1 |
| Coordinates | 39.0000, -76.2333 |
| Nearest City | Annapolis (22 km) |
| Urban exposure index (PEI) | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-06T22:04:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.1887a37ad6cbd9dd816039bd82a9c8a4 |
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: 2026-06-06T22:04:00.000Z.
First archived: 2026-06-06T22:15:32.229Z. 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 | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | District of Columbia, DC; Anne Arundel, MD; Calvert, MD; Prince Georges, MD; Arlington, VA; Fairfax, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Tidal Potomac from Key Bridge to Indian Head MD; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Patapsco River including Baltimore Harbor and 3 more areas |
| Headline | Severe Thunderstorm Watch issued June 6 at 6:04PM EDT until June 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-06T20:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1887a37ad6cbd9dd816039bd82a9c8a446a95b1a.002.1","noaa_urn:oid:2.49.0.1.840.0.1887a37ad6cbd9dd816039bd82a9c8a446a95b1a.003.1","noaa_urn:oid:2.49.0.1.840.0.1887a37ad6cbd9dd816039bd82a9c8a446a95b1a.005.1","noaa_urn:oid:2.49.0.1.840.0.1887a37ad6cbd9dd816039bd82a9c8a446a95b1a.004.1","noaa_urn:oid:2.49.0.1.840.0.7eff17190b35f29b26c09531e363a478c6041577.001.1","noaa_urn:oid:2.49.0.1.840.0.7eff17190b35f29b26c09531e363a478c6041577.002.1"] |
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.
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