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.
This alert expired on 21 July 2026 at 02:00 UTC. It is kept here as a record.
What the source measured
NOAA reported: Tornado Warning issued July 20 at 8:06PM CDT until July 20 at 9:00PM CDT by NWS Green Bay WI
Urban PEI: 98,664 within a heuristic 50 km radius; not unique people.
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 | 44.7514, -89.4925 |
| Nearest City | Weston (16 km) |
| Urban exposure index (PEI) | 98.7K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-21T01:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.cbb4380882508659c159c59f37ac3ffb |
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: 2026-07-21T01:06:00.000Z.
First archived: 2026-07-21T01:08:44.964Z. 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; Shawano, WI; Waupaca, WI; Marathon, WI; Portage, WI; Jackson, WI and 4 more areas |
| Headline | Tornado Warning issued July 20 at 8:06PM CDT until July 20 at 9:00PM CDT by NWS Green Bay WI |
| Expires | 2026-07-20T21:00:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["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.afd97b367cbebfb33a60302309c8963a9991f2a9.001.1","noaa_urn:oid:2.49.0.1.840.0.6d82159dc93b6e7207336e9e93afac235ac71779.001.1","noaa_urn:oid:2.49.0.1.840.0.eb962ab89cb826b5d0e4e526ec3e786c511e3ba7.002.1","noaa_urn:oid:2.49.0.1.840.0.ff54690d6832b31d6c2682282fed5ce626c3e563.001.1","noaa_urn:oid:2.49.0.1.840.0.8505a61fed184828fb1bf9e4eec815935c4e2659.001.1"] |
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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