This alert expired on 17 March 2026 at 04:00 UTC. It is kept here as a record.
It is the 13th strongest of the 229 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 16 March 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued March 16 at 8:16PM EDT until March 17 at 12:00AM EDT by NWS Baltimore MD/Washington DC
An estimated 1,757,769 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 27, 2026 · score 52 · 0.0 km
- June 6, 2026 · score 52 · 3.4 km
- June 13, 2026 · score 52 · 4.0 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 88% |
| Coordinates | 39.0000, -76.3250 |
| Nearest City | Annapolis (14 km) |
| Population Exposed | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T00:16:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.d2d762cc7528bb76cd42ea27934b1f85 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | 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; Anne Arundel, MD; Calvert, MD; Charles, MD; Prince Georges, MD; St. Marys, MD; King George, VA; Dorchester, MD; Somerset, MD; Wicomico, MD; Worcester, MD; Bertie, NC; Camden, NC; Chowan, NC; Currituck, NC; Gates, NC; Hertford, NC; Northampton, NC; Pasquotank, NC; Perquimans, NC; Accomack, VA; Caroline, VA; Charles City, VA; Chesterfield, VA; Dinwiddie, VA; Essex, VA; Gloucester, VA; Greensville, VA; Hanover, VA; Henrico, VA; Isle of Wight, VA; James City, VA; King and Queen, VA; King William, VA; Lancaster, VA; Mathews, VA; Middlesex, VA; New Kent, VA; Northampton, VA; Northumberland, VA; Prince George, VA; Richmond, VA; Southampton, VA; Surry, VA; Sussex, VA; Westmoreland, VA; York, VA; City of Chesapeake, VA; City of Colonial Heights, VA; City of Emporia, VA; City of Franklin, VA; City of Hampton, VA; City of Hopewell, VA; City of Newport News, VA; City of Norfolk, VA; City of Petersburg, VA; City of Poquoson, VA; City of Portsmouth, VA; City of Richmond, VA; City of Suffolk, VA; City of Virginia Beach, VA; City of Williamsburg, VA and 1 more areas |
| Headline | Severe Thunderstorm Watch issued March 16 at 8:16PM EDT until March 17 at 12:00AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-17T00:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d2d762cc7528bb76cd42ea27934b1f85035e82a6.002.1","noaa_urn:oid:2.49.0.1.840.0.d2d762cc7528bb76cd42ea27934b1f85035e82a6.001.1","noaa_urn:oid:2.49.0.1.840.0.bff1858fc47c67ce7bec0475a51bea43cbc27aba.001.1","noaa_urn:oid:2.49.0.1.840.0.bff1858fc47c67ce7bec0475a51bea43cbc27aba.002.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Hyattsville |
| Spc County | Prince Georges |
| Spc State | MD |
| Spc Comments | Tree fell on a vehicle at the 6400 block of Kilmer Street (LWX) |
| Google News RssFeed | weather |
| Google News SourceName | WBAL-TV |
| MergedSources | [{"id":"spc_wind_39.34_-77.07_108","source":"spc","severity":"medium","severityValue":45,"timestamp":1773706563066,"latitude":39.34,"longitude":-77.07},{"id":"spc_wind_39.41_-77.01_113","source":"spc","severity":"medium","severityValue":45,"timestamp":1773706563066,"latitude":39.41,"longitude":-77.01},{"id":"spc_wind_39.50_-76.66_147","source":"spc","severity":"medium","severityValue":45,"timestamp":1773706563066,"latitude":39.5,"longitude":-76.66},{"id":"spc_wind_38.89_-76.87_149","source":"spc","severity":"medium","severityValue":45,"timestamp":1773706563066,"latitude":38.89,"longitude":-76.87},{"id":"gnews_weather_492693_166","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773695880000,"latitude":39.29,"longitude":-76.61}] |
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 Annapolis?
Calamity.live data shows a weather event with CalamityScore 52/100, near Annapolis (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.