Right now
The most recent data we hold from NOAA arrived 22 minutes 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 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 63 recorded within 20 km of this point since 17 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 4:05PM EDT until June 18 at 5:00PM EDT by NWS Boston/Norton MA
Urban PEI: 145,465 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 18, 2026 · score 43 · 6.0 km
- June 26, 2026 · score 37 · 19.8 km
- July 16, 2026 · score 43 · 25.4 km
How we know
9 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 42.8627, -72.1478 |
| Nearest City | Keene (13 km) |
| Urban exposure index (PEI) | 145.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T20:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4fb56a9fa2e08381cb13c126670e0919 |
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: 2026-06-18T20:05:00.000Z.
First archived: 2026-06-18T20:07:24.423Z. 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 | Franklin, MA; Middlesex, MA; Worcester, MA; Cheshire, NH; Hillsborough, NH; Merrimack, NH; Rockingham, NH; Belknap, NH; Carroll, NH; Grafton, NH; Merrimack, NH and 2 more areas |
| Headline | Severe Thunderstorm Warning issued June 18 at 4:05PM EDT until June 18 at 5:00PM EDT by NWS Boston/Norton MA |
| Expires | 2026-06-18T17:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["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","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 | D |
| Iem City | 4 SSW Westminster |
| Iem County | Windham |
| Iem State | VT |
| Iem Wfo | ALY |
| Iem Remark | Tree down on wires on Old Ledge Road in the Town of Westminster. |
| 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_43.400_-72.360_1781809500000","source":"iem","severity":"low","severityValue":25,"timestamp":1781809500000,"latitude":43.4,"longitude":-72.36},{"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_43.510_-72.150_1781810100000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810100000,"latitude":43.51,"longitude":-72.15},{"id":"iem_D_43.080_-72.540_1781810580000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810580000,"latitude":43.08,"longitude":-72.54},{"id":"iem_D_43.170_-72.410_1781810400000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810400000,"latitude":43.17,"longitude":-72.41},{"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_43.030_-72.490_1781810700000","source":"iem","severity":"low","severityValue":25,"timestamp":1781810700000,"latitude":43.03,"longitude":-72.49}] |
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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