This alert expired on 17 March 2026 at 04:15 UTC. It is kept here as a record.
It is the 151st strongest of the 237 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 169 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued March 16 at 11:03PM EDT until March 17 at 12:00AM EDT by NWS Mount Holly NJ
An estimated 39,403 people live within 50 km of this point.
Nearby, since 11 March 2026
- August 27, 2026 · score 34 · 0.0 km
- August 8, 2026 · score 34 · 0.0 km
- July 22, 2026 · score 46 · 0.0 km
How we know
Confirmed by 9 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 87 % 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) | 34 / 100 |
| Our confidence | 87% |
| Coordinates | 39.0000, -75.5000 |
| Nearest City | Dover (18 km) |
| Population Exposed | 39.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T03:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.88440b90f787c3e1e35a65a300f09f92 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Kent, DE; New Castle, DE; Sussex, DE; Atlantic, NJ; Burlington, NJ; Camden, NJ; Cape May, NJ; Cumberland, NJ; Gloucester, NJ; Ocean, NJ; Salem, NJ; Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm; Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm; Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm |
| Headline | Severe Thunderstorm Watch issued March 16 at 11:03PM EDT until March 17 at 12:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-03-17T00:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.88440b90f787c3e1e35a65a300f09f92564b16b5.002.1","noaa_urn:oid:2.49.0.1.840.0.88440b90f787c3e1e35a65a300f09f92564b16b5.003.1"] |
| Spc ReportType | wind |
| Spc Speed | 66 |
| Spc Location | Dover Air Force Base |
| Spc County | Kent |
| Spc State | DE |
| Spc Comments | (PHI) |
| MergedSources | [{"id":"spc_wind_38.92_-76.32_278","source":"spc","severity":"medium","severityValue":45,"timestamp":1773712740000,"latitude":38.92,"longitude":-76.32},{"id":"spc_wind_39.40_-76.04_281","source":"spc","severity":"medium","severityValue":45,"timestamp":1773713340000,"latitude":39.4,"longitude":-76.04},{"id":"spc_wind_38.54_-75.94_286","source":"spc","severity":"medium","severityValue":45,"timestamp":1773714240000,"latitude":38.54,"longitude":-75.94},{"id":"spc_wind_38.91_-75.95_287","source":"spc","severity":"medium","severityValue":45,"timestamp":1773714300000,"latitude":38.91,"longitude":-75.95},{"id":"spc_wind_38.98_-75.80_288","source":"spc","severity":"medium","severityValue":45,"timestamp":1773714420000,"latitude":38.98,"longitude":-75.8},{"id":"spc_wind_39.22_-75.60_292","source":"spc","severity":"medium","severityValue":45,"timestamp":1773715800000,"latitude":39.22,"longitude":-75.6},{"id":"spc_wind_39.09_-75.46_293","source":"spc","severity":"medium","severityValue":45,"timestamp":1773715920000,"latitude":39.09,"longitude":-75.46},{"id":"spc_wind_39.13_-75.47_294","source":"spc","severity":"medium","severityValue":45,"timestamp":1773716100000,"latitude":39.13,"longitude":-75.47}] |
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 Dover?
Calamity.live data shows a weather event with CalamityScore 34/100, near Dover (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.