Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 June 2026 at 20:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 56 detections recorded within 20 km of this point since 7 April 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 3:40PM EDT until June 18 at 4:45PM EDT by NWS Gray ME
Urban PEI: 63,351 within a heuristic 50 km radius; not unique people.
Nearby, since 7 April 2026
- June 18, 2026 · score 43 · 22.8 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.83/1 |
| Coordinates | 42.9358, -72.3295 |
| Nearest City | Keene (4 km) |
| Urban exposure index (PEI) | 63.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T19:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.bbfd21e2e66247c8eb824d9d70fa129d |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-18T19:40:00.000Z.
First archived: 2026-06-18T20:01:54.925Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Belknap, NH; Carroll, NH; Grafton, NH; Merrimack, NH; Berkshire, MA; Columbia, NY; Cheshire, NH; Hillsborough, NH; Sullivan, NH |
| Headline | Severe Thunderstorm Warning issued June 18 at 3:40PM EDT until June 18 at 4:45PM EDT by NWS Gray ME |
| Expires | 2026-06-18T16:45:00-04:00 |
| SenderName | NWS Gray ME |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bbfd21e2e66247c8eb824d9d70fa129d365948eb.001.1","noaa_urn:oid:2.49.0.1.840.0.65cb2c0117b0b89ae44396547442bbdc3d26f70b.001.1","noaa_urn:oid:2.49.0.1.840.0.1be77c50443578a54bc52c863fbbf8ba86472842.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 64 |
| Iem Unit | MPH |
| Iem City | 1 E Claremont |
| Iem County | Sullivan |
| Iem State | NH |
| Iem Wfo | GYX |
| Iem Remark | Chaser measured recent wind gust of 64 mph in Claremont on a handheld anemometer. |
| MergedSources | [{"id":"iem_G_43.380_-72.340_1781809500000","source":"iem","severity":"low","severityValue":25,"timestamp":1781809500000,"latitude":43.38,"longitude":-72.34}] |
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 8 March 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.
Review the area, threshold and delivery channel in your account.
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