This alert expired on 26 June 2026 at 23:15 UTC. It is kept here as a record.
It is the 5th strongest of the 55 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 26 at 7:06PM EDT until June 26 at 7:15PM EDT by NWS Gray ME
An estimated 860,820 people live within 50 km of this point.
Nearby, since 17 March 2026
- June 18, 2026 · score 48 · 9.4 km
- July 28, 2026 · score 48 · 11.5 km
- March 17, 2026 · score 52 · 11.8 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 86 % 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 | 86% |
| Coordinates | 43.0500, -71.4280 |
| Nearest City | Manchester (6 km) |
| Population Exposed | 860.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-26T23:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.578b1828b2141cb8e63ff99eba38140b183016b5.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hillsborough, NH; Merrimack, NH; Rockingham, NH |
| Headline | Severe Thunderstorm Warning issued June 26 at 7:06PM EDT until June 26 at 7:15PM EDT by NWS Gray ME |
| Expires | 2026-06-26T19:15:00-04:00 |
| SenderName | NWS Gray ME |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 3 SE Sutton |
| Iem County | Merrimack |
| Iem State | NH |
| Iem Wfo | GYX |
| Iem Remark | Trees on wires on Birch Hill Rd. Time estimated by radar. |
| MergedSources | [{"id":"iem_D_43.300_-71.830_1782509820000","source":"iem","severity":"low","severityValue":25,"timestamp":1782509820000,"latitude":43.3,"longitude":-71.83},{"id":"iem_D_43.400_-72.080_1782508200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782508200000,"latitude":43.4,"longitude":-72.08},{"id":"iem_H_43.390_-72.020_1782508200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782508200000,"latitude":43.39,"longitude":-72.02},{"id":"iem_D_43.360_-72.010_1782508800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782508800000,"latitude":43.36,"longitude":-72.01},{"id":"iem_H_43.380_-72.150_1782507840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782507840000,"latitude":43.38,"longitude":-72.15},{"id":"iem_D_43.310_-71.900_1782509460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782509460000,"latitude":43.31,"longitude":-71.9}] |
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.