Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
20 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 19 September 2026 at 06:00 UTC. It is kept here as a record.
It is the 10th strongest of the 80 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 18 at 11:26PM CDT until September 19 at 1:00AM CDT by NWS Twin Cities/Chanhassen MN
Urban PEI: 136,788 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 2, 2026 · score 37 · 9.6 km
- July 1, 2026 · score 43 · 10.2 km
- May 18, 2026 · score 43 · 15.7 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 43.7699, -92.5261 |
| Nearest City | Rochester (28 km) |
| Urban exposure index (PEI) | 136.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-19T04:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.eaeb77e0b590871f35f7dae9e3dbc0d420a61d7e.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: 2026-09-19T04:26:00.000Z.
First archived: 2026-09-19T04:32:04.024Z. 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 | Blue Earth, MN; Faribault, MN; Freeborn, MN; Steele, MN; Waseca, MN; Houston, MN; Fillmore, MN; Mower, MN |
| Headline | Flash Flood Warning issued September 18 at 11:26PM CDT until September 19 at 1:00AM CDT by NWS Twin Cities/Chanhassen MN |
| Expires | 2026-09-19T01:00:00-05:00 |
| SenderName | NWS Twin Cities/Chanhassen MN |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eaeb77e0b590871f35f7dae9e3dbc0d420a61d7e.001.1","noaa_urn:oid:2.49.0.1.840.0.e1afc2444d1aee6c8d9373eef9efeef044b9ffac.001.1","noaa_urn:oid:2.49.0.1.840.0.4bc456ab2b86c8806001435cecc274a69122c636.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 2.7 |
| Iem Unit | Inch |
| Iem City | Ellendale |
| Iem County | Steele |
| Iem State | MN |
| Iem Wfo | MPX |
| Iem Remark | Storm Total Rainfall since 8:45am. Rain continues to fall. |
| MergedSources | [{"id":"iem_R_43.870_-93.300_1789786800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789786800000,"latitude":43.87,"longitude":-93.3}] |
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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