Right now
The most recent data we hold from NOAA arrived 19 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
4 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 28 September 2026 at 17:45 UTC. It is kept here as a record.
No stronger detection stands among the 7 recorded within 20 km of this point since 11 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 28 at 7:55AM EDT until September 28 at 1:45PM EDT by NWS Boston/Norton MA
Urban PEI: 4,046,250 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- September 28, 2026 · score 46 · 0.0 km
- September 28, 2026 · score 46 · 12.7 km
- March 18, 2026 · 12.7 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 | 0.81/1 |
| Coordinates | 41.9327, -71.1952 |
| Nearest City | Norton (4 km) |
| Urban exposure index (PEI) | 4.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-28T11:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.9aff2bb2567508cec2ae041aedd0c9c5315639ad.001.1 |
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: 2026-09-28T11:55:00.000Z.
First archived: 2026-09-28T11:58:35.072Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2 retained revisions changed source fields this page does not show; the index, severity and version stayed the same.
Score Breakdown
Technical Details
| Event | Flood Warning |
| MessageId | urn:oid:2.49.0.1.840.0.9aff2bb2567508cec2ae041aedd0c9c5315639ad.001.1 |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Bristol, MA; Norfolk, MA; Plymouth, MA; Worcester, MA; Providence, RI; Bristol, MA; Plymouth, MA |
| Headline | Flood Warning issued September 28 at 7:55AM EDT until September 28 at 1:45PM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-28T13:45:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9aff2bb2567508cec2ae041aedd0c9c5315639ad.001.1","noaa_urn:oid:2.49.0.1.840.0.191d971382585fba397f300b3cedc378ab8ce595.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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