This alert expired on 18 June 2026 at 21:30 UTC. It is kept here as a record.
It is the 5th strongest of the 54 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 4:42PM EDT until June 18 at 5:30PM EDT by NWS Gray ME
An estimated 789,633 people live within 50 km of this point.
Nearby, since 17 March 2026
- June 26, 2026 · score 48 · 9.4 km
- March 17, 2026 · score 52 · 11.5 km
- June 18, 2026 · score 48 · 16.1 km
How we know
Confirmed by 10 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 89 % 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) | 48 / 100 |
| Our confidence | 89% |
| Coordinates | 43.0826, -71.3216 |
| Nearest City | Manchester (14 km) |
| Population Exposed | 789.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T20:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f7b7648785d8b31fd27c09d95eb5d6be |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | York, ME; Hillsborough, NH; Rockingham, NH; Strafford, NH; Androscoggin, ME; Cumberland, ME; Oxford, ME; York, ME; Belknap, NH; Carroll, NH; Merrimack, NH; Rockingham, NH; Strafford, NH; Franklin, MA; Middlesex, MA; Worcester, MA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 18 at 4:42PM EDT until June 18 at 5:30PM EDT by NWS Gray ME |
| Expires | 2026-06-18T17:30:00-04:00 |
| SenderName | NWS Gray ME |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f7b7648785d8b31fd27c09d95eb5d6bed4efe2d8.001.1","noaa_urn:oid:2.49.0.1.840.0.36b57b4c4394fcde39b11d05bd97209bd03c3738.001.1","noaa_urn:oid:2.49.0.1.840.0.4fb56a9fa2e08381cb13c126670e091984ffe3a5.001.1","noaa_urn:oid:2.49.0.1.840.0.30ca2b3437e1cfe4280e70a8bf009387ce2c30fc.001.1"] |
| Iem TypeSummary | D |
| Iem City | 3 NNW Franklin |
| Iem County | Merrimack |
| Iem State | NH |
| Iem Wfo | GYX |
| Iem Remark | Wires down blocking NH-3A in Franklin. Time estimated by radar. |
| MergedSources | [{"id":"iem_D_43.400_-72.110_1781811000000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811000000,"latitude":43.4,"longitude":-72.11},{"id":"iem_D_42.790_-71.950_1781814180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781814180000,"latitude":42.79,"longitude":-71.95},{"id":"iem_D_43.500_-71.570_1781812500000","source":"iem","severity":"low","severityValue":25,"timestamp":1781812500000,"latitude":43.5,"longitude":-71.57},{"id":"iem_D_43.580_-71.700_1781811780000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811780000,"latitude":43.58,"longitude":-71.7},{"id":"iem_D_43.630_-71.730_1781811780000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811780000,"latitude":43.63,"longitude":-71.73},{"id":"iem_D_42.900_-71.780_1781814180000","source":"iem","severity":"low","severityValue":25,"timestamp":1781814180000,"latitude":42.9,"longitude":-71.78},{"id":"iem_D_43.390_-72.090_1781811300000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811300000,"latitude":43.39,"longitude":-72.09},{"id":"iem_D_42.940_-72.090_1781811900000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811900000,"latitude":42.94,"longitude":-72.09},{"id":"iem_D_43.490_-71.660_1781812380000","source":"iem","severity":"low","severityValue":25,"timestamp":1781812380000,"latitude":43.49,"longitude":-71.66}] |
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 Manchester?
Calamity.live data shows a weather event with CalamityScore 48/100, near Manchester (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.