This alert expired on 28 May 2026 at 01:00 UTC. It is kept here as a record.
It is the 13th strongest of the 220 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 20 May 2026. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued May 27 at 1:15PM EDT until May 27 at 9:00PM 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
- June 6, 2026 · score 52 · 3.4 km
- June 13, 2026 · score 52 · 4.0 km
- June 22, 2026 · score 52 · 5.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 90% |
| Coordinates | 39.0000, -76.3250 |
| Nearest City | Annapolis (14 km) |
| Population Exposed | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T17:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.884cf7df0e634f2a5798e6bc9a249803 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Calvert, MD; Charles, MD; St. Marys, MD; Albemarle, VA; Augusta, VA; Greene, VA; Highland, VA; King George, VA; Nelson, VA; Orange, VA; Rockingham, VA; Spotsylvania, VA; Stafford, VA; City of Charlottesville, VA; City of Fredericksburg, VA; City of Harrisonburg, VA; City of Staunton, VA; City of Waynesboro, VA; Pendleton, WV; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; 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; Chesapeake Bay from Smith Point to Windmill Point VA; Chesapeake Bay from Windmill Point to New Point Comfort VA; Chesapeake Bay from New Point Comfort to Little Creek VA; Chesapeake Bay from Little Creek VA to Cape Henry VA including the Chesapeake Bay Bridge Tunnel; Rappahannock River from Urbanna to Windmill Point; York River; James River from Jamestown to the James River Bridge; James River from JRB to HRBT, Including the Elizabeth River; Coastal waters from Fenwick Island DE to Chincoteague VA out 20 NM; Coastal waters from Chincoteague to Parramore Island VA out 20 NM; Coastal waters from Parramore Island to Cape Charles Light VA out 20 NM; Coastal Waters from Cape Charles Light to Virginia-North Carolina border out 20 NM and 1 more areas |
| Headline | Severe Thunderstorm Watch issued May 27 at 1:15PM EDT until May 27 at 9:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-05-27T21:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.884cf7df0e634f2a5798e6bc9a2498037cfce55e.001.1","noaa_urn:oid:2.49.0.1.840.0.884cf7df0e634f2a5798e6bc9a2498037cfce55e.002.1","noaa_urn:oid:2.49.0.1.840.0.b7e37be50614f1cb3091dc74a0a9308cf23f1936.002.1","noaa_urn:oid:2.49.0.1.840.0.b7e37be50614f1cb3091dc74a0a9308cf23f1936.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 1 N Highland Acres |
| Iem County | Kent |
| Iem State | DE |
| Iem Wfo | PHI |
| Iem Remark | Trained spotter on Manor Drive in Dover estimated wind gusts 45 to 50 mph with a thunderstorm. No damage observed. |
| MergedSources | [{"id":"iem_R_39.200_-76.110_1779904500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779904500000,"latitude":39.2,"longitude":-76.11},{"id":"iem_G_39.130_-75.520_1779897300000","source":"iem","severity":"low","severityValue":25,"timestamp":1779897300000,"latitude":39.13,"longitude":-75.52}] |
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 10 February 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.
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 188 scientific monitoring sources.