This alert expired on 18 June 2026 at 21:15 UTC. It is kept here as a record.
It is the 5th strongest of the 29 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 4:21PM EDT until June 18 at 5:15PM EDT by NWS Gray ME
An estimated 378,423 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 15, 2026 · score 43 · 13.3 km
- June 18, 2026 · score 48 · 19.0 km
- June 26, 2026 · score 48 · 20.0 km
How we know
Confirmed by 17 independent sources, including NOAA.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 43.2292, -71.4414 |
| Nearest City | East Concord (8 km) |
| Population Exposed | 378.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T20:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.36b57b4c4394fcde39b11d05bd97209b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Androscoggin, ME; Cumberland, ME; Oxford, ME; York, ME; Belknap, NH; Carroll, NH; Merrimack, NH; Rockingham, NH; Strafford, NH; Franklin, MA; Middlesex, MA; Worcester, MA; Cheshire, NH; Hillsborough, NH; Merrimack, NH; Rockingham, NH and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 18 at 4:21PM EDT until June 18 at 5:15PM EDT by NWS Gray ME |
| Expires | 2026-06-18T17:15:00-04:00 |
| SenderName | NWS Gray ME |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["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","noaa_urn:oid:2.49.0.1.840.0.bbfd21e2e66247c8eb824d9d70fa129d365948eb.001.1"] |
| Iem TypeSummary | D |
| Iem City | 4 SE Enfield |
| Iem County | Grafton |
| Iem State | NH |
| Iem Wfo | GYX |
| Iem Remark | Trees and wires down. Time estimated from 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_G_43.380_-72.340_1781809500000","source":"iem","severity":"low","severityValue":25,"timestamp":1781809500000,"latitude":43.38,"longitude":-72.34},{"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_43.510_-72.150_1781810100000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810100000,"latitude":43.51,"longitude":-72.15},{"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_43.790_-71.840_1781811000000","source":"iem","severity":"low","severityValue":25,"timestamp":1781811000000,"latitude":43.79,"longitude":-71.84},{"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_43.660_-72.040_1781809800000","source":"iem","severity":"low","severityValue":25,"timestamp":1781809800000,"latitude":43.66,"longitude":-72.04},{"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_43.040_-72.270_1781812080000","source":"iem","severity":"low","severityValue":25,"timestamp":1781812080000,"latitude":43.04,"longitude":-72.27},{"id":"iem_D_43.290_-72.340_1781810400000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810400000,"latitude":43.29,"longitude":-72.34},{"id":"iem_D_43.490_-71.660_1781812380000","source":"iem","severity":"low","severityValue":25,"timestamp":1781812380000,"latitude":43.49,"longitude":-71.66},{"id":"iem_D_43.600_-72.100_1781809500000","source":"iem","severity":"low","severityValue":25,"timestamp":1781809500000,"latitude":43.6,"longitude":-72.1}] |
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 East Concord?
Calamity.live data shows a weather event with CalamityScore 43/100, near East Concord (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.