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 20 July 2026 at 13:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 24 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 9 July 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 7:06AM CDT until July 20 at 8:00AM CDT by NWS La Crosse WI
Urban PEI: 67,962 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 30, 2026 · score 32 · 9.9 km
- July 20, 2026 · score 39 · 15.8 km
- June 7, 2026 · score 39 · 16.0 km
How we know
One source: NOAA. 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 43.8507, -93.0514 |
| Nearest City | Austin (21 km) |
| Urban exposure index (PEI) | 68.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-20T12:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.628755cc6079982e77c3e3218428be97 |
Physical priority index · v1. 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: 2026-07-20T12:06:00.000Z.
First archived: 2026-07-20T12:15:03.594Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Mitchell, IA; Dodge, MN; Fillmore, MN; Mower, MN; Olmsted, MN; Freeborn, MN; Steele, MN; Waseca, MN |
| Headline | Severe Thunderstorm Warning issued July 20 at 7:06AM CDT until July 20 at 8:00AM CDT by NWS La Crosse WI |
| Expires | 2026-07-20T08:00:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.628755cc6079982e77c3e3218428be976bfac740.001.1","noaa_urn:oid:2.49.0.1.840.0.31ae74aeba47c8d34f5d9a2755a0ca3af4fd0f7a.001.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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