This alert expired on 8 August 2026 at 01:50 UTC. It is kept here as a record.
No stronger detection stands among the 62 recorded within 20 km of this point since 16 March 2026 — 13 others scored the same. Another comparable one was recorded here earlier the same day. 31 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 7 at 9:41PM EDT until August 7 at 9:45PM EDT by NWS Boston/Norton MA
An estimated 1,227,731 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 3, 2026 · score 52 · 8.9 km
- May 19, 2026 · score 48 · 12.5 km
- March 17, 2026 · score 52 · 13.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 84 % 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 | 84% |
| Coordinates | 42.0820, -71.8960 |
| Nearest City | Southbridge (11 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-08T01:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7af9d1beaf3155872983e08f271ea6a015f91297.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Windham, CT; Worcester, MA |
| Headline | Severe Thunderstorm Warning issued August 7 at 9:41PM EDT until August 7 at 9:45PM EDT by NWS Boston/Norton MA |
| Expires | 2026-08-07T21:50:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 2 NNE Dudley |
| Iem County | Worcester |
| Iem State | MA |
| Iem Wfo | BOX |
| Iem Remark | large tree downed on intersection of pierpont rd and lelandville rd in Dudley. relayed by amateur radio. |
| MergedSources | [{"id":"iem_D_42.080_-71.920_1786151040000","source":"iem","severity":"low","severityValue":25,"timestamp":1786151040000,"latitude":42.08,"longitude":-71.92}] |
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 Southbridge?
Calamity.live data shows a weather event with CalamityScore 52/100, near Southbridge (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.