Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 24 September 2026 at 19:15 UTC. It is kept here as a record.
It is the 18th strongest of the 87 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 8 August 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Storm Watch issued September 24 at 2:05AM 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
- June 30, 2026 · score 52 · 0.0 km
- June 18, 2026 · score 64 · 0.0 km
- May 30, 2026 · score 52 · 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 | 0.80/1 |
| Coordinates | 42.2000, -71.5000 |
| Nearest City | Milford (7 km) |
| Urban exposure index (PEI) | 5.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-25T12:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.96cf3b0da1fcad84fd4aa24589864a8a2b1b8547.007.2 |
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: 2026-09-25T12:00:00.000Z.
First archived: 2026-09-24T12:02:23.828Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-24T15:56:00.996Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T15:24:07.486Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-24T13:21:50.935Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Storm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM |
| Headline | Storm Watch issued September 24 at 2:05AM EDT until September 26 at 8:00PM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-24T15:15:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | false |
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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