This alert expired on 27 May 2026 at 16:00 UTC. It is kept here as a record.
It is the 4th strongest of the 198 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 20 May 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 27 at 11:41AM EDT until May 27 at 12:00PM EDT by NWS Mount Holly NJ
An estimated 206,311 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 5, 2026 · score 43 · 2.1 km
- May 20, 2026 · score 43 · 13.9 km
- August 10, 2026 · score 43 · 15.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 78 % 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) | 43 / 100 |
| Our confidence | 78% |
| Coordinates | 39.2417, -75.5150 |
| Nearest City | Dover (9 km) |
| Population Exposed | 206.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T15:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.19fba4ce9d14732ee1b0d767abe3f60bb489075d.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Kent, DE; New Castle, DE |
| Headline | Severe Thunderstorm Warning issued May 27 at 11:41AM EDT until May 27 at 12:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-05-27T12:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
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.
Want to know when something happens near Dover?
Calamity.live data shows a weather event with CalamityScore 43/100, near Dover (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.