This alert expired on 2 July 2026 at 05:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 72 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 18 June 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 1 at 11:58PM EDT until July 2 at 1:00AM EDT by NWS Boston/Norton MA
An estimated 1,232,626 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 8, 2026 · score 41 · 7.1 km
- May 19, 2026 · score 52 · 9.6 km
- July 29, 2026 · score 52 · 12.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % 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 | 79% |
| Coordinates | 42.3786, -71.7943 |
| Nearest City | Holden (6 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T03:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.da812e85c4ee85a1026a1bf04c8e14d8d99f31f0.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Tolland, CT; Windham, CT; Franklin, MA; Hampden, MA; Hampshire, MA; Middlesex, MA; Norfolk, MA; Worcester, MA; Providence, RI |
| Headline | Severe Thunderstorm Warning issued July 1 at 11:58PM EDT until July 2 at 1:00AM EDT by NWS Boston/Norton MA |
| Expires | 2026-07-02T01:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| 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 Holden?
Calamity.live data shows a weather event with CalamityScore 52/100, near Holden (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.