Right now
The most recent data we hold from NOAA arrived 3 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
6 other detections within 20 km in the last 24 hours, the nearest 14 km from here.
This alert expired on 13 September 2026 at 18:00 UTC. It is kept here as a record.
It is the 9th strongest of the 23 detections recorded within 20 km of this point since 7 June 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 13 at 12:25PM EDT until September 13 at 2:00PM EDT by NWS Boston/Norton MA
Urban PEI: 1,593,145 within a heuristic 50 km radius; not unique people.
Nearby, since 7 June 2026
- July 31, 2026 · score 48 · 11.5 km
- September 13, 2026 · score 46 · 14.1 km
- August 11, 2026 · score 52 · 14.8 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
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 v4. 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 | 0.87/1 |
| Coordinates | 41.3479, -72.5442 |
| Nearest City | Madison (9 km) |
| Urban exposure index (PEI) | 1.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-13T16:25:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3803085805f4856da1bf3e0bcfde3c3c668b8903.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-13T16:25:00.000Z.
First archived: 2026-09-13T16:31:34.475Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bristol, MA; Plymouth, MA; Bristol, MA; Bristol, RI; Kent, RI; Newport, RI; Providence, RI; Washington, RI; Middlesex, CT; New London, CT and 2 more areas |
| Headline | Flash Flood Warning issued September 13 at 12:25PM EDT until September 13 at 2:00PM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-13T14:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3803085805f4856da1bf3e0bcfde3c3c668b8903.001.1","noaa_urn:oid:2.49.0.1.840.0.e5b3afdd27a79a65b85181c26cd4efbdbec150c8.001.1","noaa_urn:oid:2.49.0.1.840.0.c953ea8a53b73a57f81c195feec7890a7fec62df.001.1","noaa_urn:oid:2.49.0.1.840.0.dd526c76516ea33fecf42574450164c148b4e937.001.1","noaa_urn:oid:2.49.0.1.840.0.4fb361e8e5bd4f92767dd285bfa1c5ecbdf36a23.001.1"] |
| Iem TypeSummary | F |
| Iem City | 2 SE Derby |
| Iem County | New Haven |
| Iem State | CT |
| Iem Wfo | OKX |
| Iem Remark | Several videos shared showing Rt 34 taking on water and becoming impassable. |
| MergedSources | [{"id":"iem_F_41.460_-72.440_1789309020000","source":"iem","severity":"low","severityValue":25,"timestamp":1789309020000,"latitude":41.46,"longitude":-72.44},{"id":"iem_F_41.300_-72.920_1789312320000","source":"iem","severity":"low","severityValue":25,"timestamp":1789312320000,"latitude":41.3,"longitude":-72.92},{"id":"iem_F_41.300_-72.920_1789306200000","source":"iem","severity":"low","severityValue":25,"timestamp":1789306200000,"latitude":41.3,"longitude":-72.92},{"id":"iem_F_41.540_-72.090_1789311600000","source":"iem","severity":"low","severityValue":25,"timestamp":1789311600000,"latitude":41.54,"longitude":-72.09},{"id":"iem_F_41.550_-72.110_1789311000000","source":"iem","severity":"low","severityValue":25,"timestamp":1789311000000,"latitude":41.55,"longitude":-72.11},{"id":"iem_F_41.300_-72.760_1789310760000","source":"iem","severity":"low","severityValue":25,"timestamp":1789310760000,"latitude":41.3,"longitude":-72.76},{"id":"iem_F_41.380_-72.710_1789309800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789309800000,"latitude":41.38,"longitude":-72.71},{"id":"iem_F_41.220_-73.050_1789305540000","source":"iem","severity":"low","severityValue":25,"timestamp":1789305540000,"latitude":41.22,"longitude":-73.05},{"id":"iem_F_41.290_-72.780_1789309500000","source":"iem","severity":"low","severityValue":25,"timestamp":1789309500000,"latitude":41.29,"longitude":-72.78},{"id":"iem_F_41.180_-73.200_1789308180000","source":"iem","severity":"low","severityValue":25,"timestamp":1789308180000,"latitude":41.18,"longitude":-73.2},{"id":"iem_F_41.180_-73.310_1789309500000","source":"iem","severity":"low","severityValue":25,"timestamp":1789309500000,"latitude":41.18,"longitude":-73.31},{"id":"iem_F_41.310_-73.060_1789308180000","source":"iem","severity":"low","severityValue":25,"timestamp":1789308180000,"latitude":41.31,"longitude":-73.06}] |
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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