Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 5 km from here.
This alert expired on 19 September 2026 at 09:00 UTC. It is kept here as a record.
It is the 24th strongest of the 40 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 15 September 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 19 at 1:17AM CDT until September 19 at 4:00AM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 121,244 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 3, 2026 · score 43 · 2.8 km
- July 4, 2026 · score 43 · 3.1 km
- September 19, 2026 · score 37 · 5.5 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 | 43.5414, -91.4917 |
| Nearest City | La Crosse (35 km) |
| Urban exposure index (PEI) | 121.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-19T06:17:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b462c1d4a9a3ed53cb92c0ae9dc8806008aed11a.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: 2026-09-19T06:17:00.000Z.
First archived: 2026-09-19T06:24:45.528Z. Material modification: 2026-09-19T07:13:07.491Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-19T07:13:07.491Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-19T06:41:00.803Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Dane, WI; Houston, MN; Vernon, WI and 2 more areas |
| Headline | Flash Flood Warning issued September 19 at 1:17AM CDT until September 19 at 4:00AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-19T04:00:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b462c1d4a9a3ed53cb92c0ae9dc8806008aed11a.001.1","noaa_urn:oid:2.49.0.1.840.0.0ba984d5dcd906659a9f7140d0a2c385b270e648.001.1","noaa_urn:oid:2.49.0.1.840.0.ff5f56293d968d5f2d0ce7a8841f0b6f6fa62c02.001.1","noaa_urn:oid:2.49.0.1.840.0.14e63c32f03d66a232962f232395922fcd6ec10c.001.1","noaa_urn:oid:2.49.0.1.840.0.dd1b220477d55a6174e58c65c830957b235c4f97.001.1"] |
| Iem TypeSummary | F |
| Iem City | 3 SSE Sheldon |
| Iem County | Houston |
| Iem State | MN |
| Iem Wfo | ARX |
| Iem Remark | Water about to cover entrance road. |
| MergedSources | [{"id":"iem_F_43.720_-91.960_1789793100000","source":"iem","severity":"low","severityValue":25,"timestamp":1789793100000,"latitude":43.72,"longitude":-91.96},{"id":"iem_F_43.770_-91.820_1789799220000","source":"iem","severity":"low","severityValue":25,"timestamp":1789799220000,"latitude":43.77,"longitude":-91.82},{"id":"iem_F_43.690_-91.540_1789795500000","source":"iem","severity":"low","severityValue":25,"timestamp":1789795500000,"latitude":43.69,"longitude":-91.54},{"id":"iem_F_43.650_-91.570_1789794060000","source":"iem","severity":"low","severityValue":25,"timestamp":1789794060000,"latitude":43.65,"longitude":-91.57}] |
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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