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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 13 September 2026 at 02:30 UTC. It is kept here as a record.
It is the 6th strongest of the 27 detections recorded within 20 km of this point since 24 May 2026. The last comparable one was on 11 September 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 12 at 7:27PM EDT until September 12 at 10:30PM EDT by NWS Wilmington OH
Urban PEI: 42,136 within a heuristic 50 km radius; not unique people.
Nearby, since 24 May 2026
- September 12, 2026 · score 28 · 14.4 km
- September 4, 2026 · score 28 · 17.7 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 39.1560, -83.1040 |
| Nearest City | Chillicothe (22 km) |
| Urban exposure index (PEI) | 42.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-12T23:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e968360409755a559c1c9e7556225bd3993f1d5f.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: 2026-09-12T23:27:00.000Z.
First archived: 2026-09-13T00:51:18.538Z. 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 | Pike, OH; Ross, OH |
| Headline | Flash Flood Warning issued September 12 at 7:27PM EDT until September 12 at 10:30PM EDT by NWS Wilmington OH |
| Expires | 2026-09-12T22:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Iem TypeSummary | E |
| Iem City | 6 NNW Waverly |
| Iem County | Ross |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Blain Highway between 772 and US23 closed due to high water. |
| MergedSources | [{"id":"iem_F_38.700_-82.470_1789242000000","source":"iem","severity":"low","severityValue":25,"timestamp":1789242000000,"latitude":38.7,"longitude":-82.47},{"id":"iem_F_38.570_-82.760_1789236360000","source":"iem","severity":"low","severityValue":25,"timestamp":1789236360000,"latitude":38.57,"longitude":-82.76},{"id":"iem_E_39.160_-83.020_1789260900000","source":"iem","severity":"low","severityValue":25,"timestamp":1789260900000,"latitude":39.16,"longitude":-83.02},{"id":"iem_F_39.350_-83.400_1789252800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789252800000,"latitude":39.35,"longitude":-83.4},{"id":"iem_E_39.170_-82.980_1789260540000","source":"iem","severity":"low","severityValue":25,"timestamp":1789260540000,"latitude":39.17,"longitude":-82.98},{"id":"iem_E_39.140_-83.750_1789261860000","source":"iem","severity":"low","severityValue":25,"timestamp":1789261860000,"latitude":39.14,"longitude":-83.75},{"id":"iem_E_39.350_-83.380_1789250880000","source":"iem","severity":"low","severityValue":25,"timestamp":1789250880000,"latitude":39.35,"longitude":-83.38},{"id":"iem_E_39.100_-82.970_1789261080000","source":"iem","severity":"low","severityValue":25,"timestamp":1789261080000,"latitude":39.1,"longitude":-82.97},{"id":"iem_E_39.120_-83.070_1789260720000","source":"iem","severity":"low","severityValue":25,"timestamp":1789260720000,"latitude":39.12,"longitude":-83.07},{"id":"iem_E_39.190_-82.980_1789260360000","source":"iem","severity":"low","severityValue":25,"timestamp":1789260360000,"latitude":39.19,"longitude":-82.98},{"id":"iem_E_39.350_-83.370_1789254120000","source":"iem","severity":"low","severityValue":25,"timestamp":1789254120000,"latitude":39.35,"longitude":-83.37},{"id":"iem_E_39.210_-83.020_1789260240000","source":"iem","severity":"low","severityValue":25,"timestamp":1789260240000,"latitude":39.21,"longitude":-83.02}] |
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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