Right now
The most recent data we hold from NOAA arrived 2 hours ago, and this point is in it.
5 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 26 September 2026 at 08:00 UTC. It is kept here as a record.
No stronger detection stands among the 6 recorded within 20 km of this point since 16 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Storm Warning issued September 25 at 2:58PM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MA
Urban PEI: 4,954,517 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 26, 2026 · score 46 · 0.0 km
- June 30, 2026 · 0.0 km
- June 18, 2026 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 42.2000, -71.5000 |
| Nearest City | Milford (7 km) |
| Urban exposure index (PEI) | 5.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-25T18:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.d3d2a99494842872c5ffbbecd96d5cf763a34706.004.1 |
Physical priority index · v5. 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: 2026-09-25T18:58:00.000Z.
First archived: 2026-09-25T05:42:40.419Z. Material modification: 2026-09-25T19:03:46.485Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-26T03:24:55.658Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T02:53:16.378Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T02:16:28.462Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-26T01:18:31.586Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T23:05:50.787Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T21:18:27.847Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T19:03:46.485Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T16:45:17.591Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T11:24:42.442Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T08:30:57.119Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T08:20:12.411Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T07:58:10.152Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-25T06:04:52.005Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Storm Warning |
| MessageId | urn:oid:2.49.0.1.840.0.d3d2a99494842872c5ffbbecd96d5cf763a34706.004.1 |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM; Ocean Waters from Provincetown to Nantucket from 20 to 60 NM |
| Headline | Storm Warning issued September 25 at 2:58PM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-26T04:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | false |
| Iem TypeSummary | Wind damage |
| Iem LsrCode | O |
| Iem LsrType | NON-TSTM WND DMG |
| Iem City | Holliston |
| Iem County | Middlesex |
| Iem State | MA |
| Iem Wfo | BOX |
| Iem Remark | In Holliston, a large tree was down on the road. Relayed by amateur radio. |
| MergedSources | [{"id":"iem_O_42.560_-71.270_1790354700000","source":"iem","severity":"low","severityValue":35,"timestamp":1790354700000,"latitude":42.56,"longitude":-71.27},{"id":"iem_O_41.880_-71.480_1790352900000","source":"iem","severity":"low","severityValue":35,"timestamp":1790352900000,"latitude":41.88,"longitude":-71.48},{"id":"iem_O_42.030_-71.210_1790373300000","source":"iem","severity":"low","severityValue":35,"timestamp":1790373300000,"latitude":42.03,"longitude":-71.21},{"id":"iem_O_42.240_-70.890_1790370420000","source":"iem","severity":"low","severityValue":35,"timestamp":1790370420000,"latitude":42.24,"longitude":-70.89},{"id":"iem_O_42.210_-71.690_1790374800000","source":"iem","severity":"low","severityValue":35,"timestamp":1790374800000,"latitude":42.21,"longitude":-71.69},{"id":"iem_O_41.880_-71.480_1790360280000","source":"iem","severity":"low","severityValue":35,"timestamp":1790360280000,"latitude":41.88,"longitude":-71.48},{"id":"iem_O_42.280_-71.090_1790355900000","source":"iem","severity":"low","severityValue":35,"timestamp":1790355900000,"latitude":42.28,"longitude":-71.09},{"id":"iem_O_42.660_-71.140_1790358300000","source":"iem","severity":"low","severityValue":35,"timestamp":1790358300000,"latitude":42.66,"longitude":-71.14},{"id":"iem_O_42.660_-71.140_1790364600000","source":"iem","severity":"low","severityValue":35,"timestamp":1790364600000,"latitude":42.66,"longitude":-71.14},{"id":"iem_O_42.130_-70.920_1790359200000","source":"iem","severity":"low","severityValue":35,"timestamp":1790359200000,"latitude":42.13,"longitude":-70.92},{"id":"iem_O_42.120_-71.180_1790363580000","source":"iem","severity":"low","severityValue":35,"timestamp":1790363580000,"latitude":42.12,"longitude":-71.18},{"id":"iem_O_42.370_-71.110_1790374200000","source":"iem","severity":"low","severityValue":35,"timestamp":1790374200000,"latitude":42.37,"longitude":-71.11},{"id":"iem_O_42.200_-71.430_1790360400000","source":"iem","severity":"low","severityValue":35,"timestamp":1790360400000,"latitude":42.2,"longitude":-71.43}] |
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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