Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 6 km from here.
This alert expired on 27 September 2026 at 18:36 UTC. It is kept here as a record.
No stronger detection stands among the 13 recorded within 20 km of this point since 16 March 2026 — 8 others scored the same. The last comparable one was on 27 September 2026. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 27 at 2:26PM EDT until September 27 at 2:30PM EDT by NWS Boston/Norton MA
Urban PEI: 5,140,382 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 19, 2026 · 11.9 km
- May 19, 2026 · 13.5 km
- May 19, 2026 · 13.7 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 | 0.82/1 |
| Coordinates | 42.1309, -71.2781 |
| Nearest City | Norwood (9 km) |
| Urban exposure index (PEI) | 5.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-28T00:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6a4c6f88562486c4d56ec7a087aa1a01967163f6.001.1 |
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: 2026-09-28T00:00:00.000Z.
First archived: 2026-09-27T17:03:17.339Z. Material modification: 2026-09-27T18:29:41.794Z.
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:2.49.0.1.840.0.6a4c6f88562486c4d56ec7a087aa1a01967163f6.001.1 |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Middlesex, MA; Norfolk, MA; Suffolk, MA; Worcester, MA; Bristol, MA; Plymouth, MA |
| Headline | Flood Warning issued September 27 at 2:26PM EDT until September 27 at 2:30PM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-27T14:36:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.26d64e5edb5a6dcee500b7d6529b9801160f2a48.001.1","noaa_urn:oid:2.49.0.1.840.0.110b2d77e32aa712dc5d42f2a9d99cdf21eeaa76.001.1"] |
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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