Right now
The most recent data we hold from IEM arrived 2 hours ago, and this point is in it.
11 other detections within 20 km in the last 24 hours, the nearest 3 km from here.
Reported by IEM today.
No stronger detection stands among the 13 recorded within 20 km of this point since 26 September 2026 — 10 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
IEM reported: In Avon, Harrison Blvd at West St was completely flooded with a vehicle disabled. Relayed by amateur radio.
Urban PEI: 4,875,928 within a heuristic 50 km radius; not unique people.
Nearby, since 26 September 2026
- September 27, 2026 · score 39 · 5.6 km
- September 27, 2026 · score 39 · 10.7 km
- September 27, 2026 · score 39 · 13.0 km
How we know
One source: IEM. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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 | Floods |
| Severity | High |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.65/1 |
| Coordinates | 42.1300, -71.0400 |
| Nearest City | Randolph (3 km) |
| Urban exposure index (PEI) | 4.9M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-27T14:43:00.000Z |
| Source | https://mesonet.agron.iastate.edu/lsr/ |
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: iem. Occurrence: 2026-09-27T14:43:00.000Z.
First archived: 2026-09-28T03:17:13.871Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
3 retained revisions changed source fields this page does not show; the index, severity and version stayed the same.
Score Breakdown
Technical Details
| TypeSummary | Flood |
| LsrCode | E |
| LsrType | FLOOD |
| City | 1 NNW Avon |
| County | Norfolk |
| State | MA |
| Wfo | BOX |
| Remark | In Avon, Harrison Blvd at West St was completely flooded with a vehicle disabled. Relayed by amateur radio. |
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.
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