Right now
The most recent data we hold from NOAA arrived 33 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 21 July 2026 at 04:00 UTC. It is kept here as a record.
It is the 6th strongest of the 139 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 20 July 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued July 20 at 9:13PM CDT until July 20 at 11:00PM CDT by NWS Green Bay WI
Nearby, since 10 March 2026
- September 2, 2026 · score 16 · 0.0 km
- August 11, 2026 · score 22 · 0.0 km
- August 9, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 43.8000, -89.6000 |
| Nearest City | Wisconsin Rapids (67 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-21T02:13:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Watch_noaa_urn:oid:2.49.0.1.840.0.be2d21db31a0624d52d77007ca3c3a63 |
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: 2026-07-21T02:13:00.000Z.
First archived: 2026-07-21T03:51:15.995Z. 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 Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Green Bay south of line from Cedar River to Rock Island Passage and north of a line from Oconto WI to Little Sturgeon Bay WI; Green Bay south of line from Oconto WI to Little Sturgeon Bay WI; Rock Island Passage to Sturgeon Bay WI; Sturgeon Bay to Two Rivers WI; Two Rivers to Sheboygan WI; Brown, WI; Calumet, WI; Door, WI; Kewaunee, WI; Manitowoc, WI; Marinette, WI; Menominee, WI; Oconto, WI; Outagamie, WI; Portage, WI; Shawano, WI; Waupaca, WI; Waushara, WI; Winnebago, WI; Wood, WI |
| Headline | Tornado Watch issued July 20 at 9:13PM CDT until July 20 at 11:00PM CDT by NWS Green Bay WI |
| Expires | 2026-07-20T23:00:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.be2d21db31a0624d52d77007ca3c3a63924dbe2c.003.1","noaa_urn:oid:2.49.0.1.840.0.be2d21db31a0624d52d77007ca3c3a63924dbe2c.002.1"] |
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.
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