Reported by IEM 74 days ago.
No stronger detection stands among the 86 recorded within 20 km of this point since 16 March 2026 — 4 others scored the same. The last comparable one was on 19 May 2026.
What the source measured
IEM reported: Tree down on power lines on Oak Hill Road. Report relayed by amateur radio.
An estimated 4,268,287 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 3, 2026 · score 46 · 8.4 km
- March 17, 2026 · score 52 · 11.5 km
- May 19, 2026 · score 52 · 18.8 km
How we know
Confirmed by 7 independent sources, including IEM.
Our own score for this event is 52 out of 100, at 69 % 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 | 69% |
| Coordinates | 42.5000, -71.5800 |
| Nearest City | Acton (12 km) |
| Population Exposed | 4.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T21:36:00.000Z |
| Source | https://mesonet.agron.iastate.edu/lsr/ |
Score Breakdown
Technical Details
| TypeSummary | O |
| City | Harvard |
| County | Worcester |
| State | MA |
| Wfo | BOX |
| Remark | Tree down on power lines on Oak Hill Road. Report relayed by amateur radio. |
| Google News RssFeed | weather |
| Google News SourceName | NBC Boston |
| MergedSources | [{"id":"gnews_weather_494948_132","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781815094000,"latitude":42.36,"longitude":-71.06},{"id":"gnews_weather_494944_134","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781800384000,"latitude":42.36,"longitude":-71.06},{"id":"gnews_weather_494954_136","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781835660000,"latitude":42.36,"longitude":-71.06},{"id":"gnews_weather_494950_138","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781820281000,"latitude":42.36,"longitude":-71.06},{"id":"gnews_weather_494949_149","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781818271000,"latitude":42.36,"longitude":-71.06},{"id":"gnews_weather_494950_154","source":"google_news","severity":"medium","severityValue":40,"timestamp":1781822006000,"latitude":42.36,"longitude":-71.06}] |
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 Acton?
Calamity.live data shows a weather event with CalamityScore 52/100, near Acton (United States), based on data from iem. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.