This alert expired on 30 June 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 74 recorded within 20 km of this point since 12 March 2026 — 5 others scored the same. 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 Warning issued June 30 at 6:51PM EDT until June 30 at 7:45PM EDT by NWS Boston/Norton MA
An estimated 1,585,208 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 30, 2026 · score 52 · 15.9 km
- August 8, 2026 · score 52 · 18.2 km
- March 13, 2026 · score 52 · 23.6 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % 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 | 88% |
| Coordinates | 41.9431, -72.8577 |
| Nearest City | Avon (15 km) |
| Population Exposed | 1.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-30T22:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f1cd87ea6fe9a95df1eafdc72e7ef40cedefce05.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hartford, CT; Tolland, CT; Hampden, MA; Hampshire, MA |
| Headline | Severe Thunderstorm Warning issued June 30 at 6:51PM EDT until June 30 at 7:45PM EDT by NWS Boston/Norton MA |
| Expires | 2026-06-30T19:45:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 4 NNE Pittsfield |
| Iem County | Berkshire |
| Iem State | MA |
| Iem Wfo | ALY |
| Iem Remark | Tree down on wires along Miner Road in Lanesborough. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_42.280_-72.380_1782846000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782846000000,"latitude":42.28,"longitude":-72.38},{"id":"iem_D_42.400_-72.500_1782845700000","source":"iem","severity":"low","severityValue":25,"timestamp":1782845700000,"latitude":42.4,"longitude":-72.5},{"id":"iem_D_42.420_-72.510_1782845520000","source":"iem","severity":"low","severityValue":25,"timestamp":1782845520000,"latitude":42.42,"longitude":-72.51},{"id":"iem_D_42.510_-73.240_1782855600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782855600000,"latitude":42.51,"longitude":-73.24}] |
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 52/100, near Avon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.