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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 July 2026 at 01:21 UTC. It is kept here as a record.
It is the 3rd strongest of the 100 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 20 at 8:11PM CDT until July 20 at 8:15PM CDT by NWS Green Bay WI
Urban PEI: 98,664 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- August 12, 2026 · score 39 · 5.6 km
- July 21, 2026 · score 67 · 7.0 km
- June 30, 2026 · score 43 · 9.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 63 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 | Critical |
| Calamity Score (ours) | 63 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 44.7478, -89.4811 |
| Nearest City | Weston (17 km) |
| Urban exposure index (PEI) | 98.7K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-21T01:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.ab4fafc11feda895543111abcf7d0792 |
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: 2026-07-21T01:11:00.000Z.
First archived: 2026-07-21T01:14:10.419Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Marathon, WI; Marinette, WI; Menominee, WI; Shawano, WI and 4 more areas |
| Headline | Tornado Warning issued July 20 at 8:11PM CDT until July 20 at 8:15PM CDT by NWS Green Bay WI |
| Expires | 2026-07-20T20:21:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ab4fafc11feda895543111abcf7d0792353fb8e2.001.1","noaa_urn:oid:2.49.0.1.840.0.3ce529cf82d4dabca71d615394c705140061e888.001.1","noaa_urn:oid:2.49.0.1.840.0.c2016bf66d216da86b38507921a27d18df87f15d.001.1","noaa_urn:oid:2.49.0.1.840.0.c93a2f2ccfe79197829388d1c9021f84836daac2.001.1","noaa_urn:oid:2.49.0.1.840.0.cbb4380882508659c159c59f37ac3ffb3e7bd959.001.1","noaa_urn:oid:2.49.0.1.840.0.b1da38adade602986704ab9a2f63cd6a25632c6b.001.1","noaa_urn:oid:2.49.0.1.840.0.191cccba8f80de068e6832b90c063076c7cb01a7.001.1","noaa_urn:oid:2.49.0.1.840.0.ff54690d6832b31d6c2682282fed5ce626c3e563.001.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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