This alert expired on 8 August 2026 at 23:00 UTC. It is kept here as a record.
It is the 151st strongest of the 221 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 8 at 5:49PM EDT until August 8 at 6:00PM 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
- July 22, 2026 · score 46 · 0.0 km
- July 21, 2026 · score 46 · 0.0 km
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 91 % 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) | 34 / 100 |
| Our confidence | 91% |
| Coordinates | 39.0000, -75.5000 |
| Nearest City | Dover (18 km) |
| Population Exposed | 39.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-08T21:49:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.ae81afd5f8ecc59dd977d4cd2a1fad12 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Kent, DE; Sussex, DE; Caroline, MD; Queen Anne's, MD; Talbot, MD; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM |
| Headline | Severe Thunderstorm Watch issued August 8 at 5:49PM EDT until August 8 at 6:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-08T19:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ae81afd5f8ecc59dd977d4cd2a1fad126afb79f6.001.1","noaa_urn:oid:2.49.0.1.840.0.ae81afd5f8ecc59dd977d4cd2a1fad126afb79f6.002.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 43 |
| Iem Unit | mph |
| Iem City | 7 SE Aberdeen Proving G |
| Iem County | ANZ530 |
| Iem State | MD |
| Iem Wfo | LWX |
| Iem Remark | Wind gusts of up to 37 knots (43 MPH) were measured by the Grove Point Range Front Light WeatherFlow sensor (XGVP) between 1:34 and 1:39 PM EDT. |
| MergedSources | [{"id":"iem_M_39.570_-75.950_1786209840000","source":"iem","severity":"low","severityValue":25,"timestamp":1786209840000,"latitude":39.57,"longitude":-75.95},{"id":"iem_D_39.380_-75.220_1786213800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786213800000,"latitude":39.38,"longitude":-75.22},{"id":"iem_D_39.380_-75.190_1786213800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786213800000,"latitude":39.38,"longitude":-75.19},{"id":"iem_M_39.490_-75.920_1786210440000","source":"iem","severity":"low","severityValue":25,"timestamp":1786210440000,"latitude":39.49,"longitude":-75.92},{"id":"iem_M_39.220_-76.250_1786210740000","source":"iem","severity":"low","severityValue":25,"timestamp":1786210740000,"latitude":39.22,"longitude":-76.25},{"id":"iem_M_39.480_-75.540_1786212300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786212300000,"latitude":39.48,"longitude":-75.54},{"id":"iem_M_39.240_-75.180_1786214700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786214700000,"latitude":39.24,"longitude":-75.18},{"id":"iem_M_39.390_-75.630_1786212300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786212300000,"latitude":39.39,"longitude":-75.63},{"id":"iem_M_39.210_-76.250_1786219920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786219920000,"latitude":39.21,"longitude":-76.25},{"id":"iem_D_39.410_-75.040_1786214400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786214400000,"latitude":39.41,"longitude":-75.04},{"id":"iem_M_39.400_-76.040_1786210440000","source":"iem","severity":"low","severityValue":25,"timestamp":1786210440000,"latitude":39.4,"longitude":-76.04}] |
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 34/100, near Dover (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.