This alert expired on 4 September 2026 at 06:00 UTC. It is kept here as a record.
It is the 189th strongest of the 263 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 4 at 12:29AM EDT until September 4 at 2:00AM EDT by NWS Baltimore MD/Washington DC
An estimated 364,634 people live within 50 km of this point.
Nearby, since 11 March 2026
- September 1, 2026 · score 37 · 0.0 km
- August 27, 2026 · score 43 · 0.0 km
- August 10, 2026 · score 43 · 0.0 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 92% |
| Coordinates | 39.0000, -76.0500 |
| Nearest City | Easton (26 km) |
| Population Exposed | 364.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T04:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.460712994e0105ac1de46468703c3f4c7bf6e354.003.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Anne Arundel, MD; Calvert, MD; Charles, MD; Prince Georges, MD; St. Marys, MD; King George, VA; Stafford, VA; City of Alexandria, VA; City of Fredericksburg, VA; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Chester River to Queenstown MD; Eastern Bay; 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 Fenwick Island DE to Chincoteague VA out 20 NM and 3 more areas |
| Headline | Severe Thunderstorm Watch issued September 4 at 12:29AM EDT until September 4 at 2:00AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-09-04T02:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.460712994e0105ac1de46468703c3f4c7bf6e354.003.1","noaa_urn:oid:2.49.0.1.840.0.460712994e0105ac1de46468703c3f4c7bf6e354.004.1","noaa_urn:oid:2.49.0.1.840.0.b5b51526e8a397c9d15cc68bec6983ab10f6ff1c.002.1","noaa_urn:oid:2.49.0.1.840.0.b5b51526e8a397c9d15cc68bec6983ab10f6ff1c.001.1","noaa_urn:oid:2.49.0.1.840.0.7158b817ea98788bf623e839ca04bb25d25d2548.002.1","noaa_urn:oid:2.49.0.1.840.0.7158b817ea98788bf623e839ca04bb25d25d2548.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 61 |
| Spc Location | 1 SSE Wittman |
| Spc County | Talbot |
| Spc State | MD |
| Spc Comments | Weather Station KMDWITTM5. (PHI) |
| Iem TypeSummary | M |
| Iem Magnitude | 46 |
| Iem Unit | mph |
| Iem City | 11 E Chesapeake Beach |
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.
Want to know when something happens near Easton?
Calamity.live data shows a weather event with CalamityScore 37/100, near Easton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.