This alert expired on 18 June 2026 at 23:00 UTC. It is kept here as a record.
It is the strongest of the 38 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 19 May 2026.
What the source measured
NOAA reported: Tornado Watch issued June 18 at 3:43PM EDT until June 18 at 7:00PM EDT by NWS Boston/Norton MA
An estimated 1,015,419 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 13, 2026 · score 52 · 4.1 km
- August 13, 2026 · score 52 · 10.2 km
- May 19, 2026 · score 52 · 11.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 64 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) | 64 / 100 |
| Our confidence | 79% |
| Coordinates | 41.9000, -72.1000 |
| Nearest City | Storrs (16 km) |
| Population Exposed | 1.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T19:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Watch_noaa_urn:oid:2.49.0.1.840.0.6a0de2f976a70ff49dd532678d813327 |
Score Breakdown
Technical Details
| Event | Tornado Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Hartford, CT; Tolland, CT; Windham, CT; Essex, MA; Franklin, MA; Hampden, MA; Hampshire, MA; Middlesex, MA; Worcester, MA; Berkshire, MA; Bennington, VT; Windham, VT |
| Headline | Tornado Watch issued June 18 at 3:43PM EDT until June 18 at 7:00PM EDT by NWS Boston/Norton MA |
| Expires | 2026-06-18T19:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6a0de2f976a70ff49dd532678d813327e30bbd3b.001.1","noaa_urn:oid:2.49.0.1.840.0.25afc98164f97c8dff41dd163c1c45fb7b2f1a7e.002.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 64/100, near Storrs (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.