This alert expired on 21 July 2026 at 05:00 UTC. It is kept here as a record.
It is the 6th strongest of the 134 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued July 20 at 10:53PM CDT until July 20 at 11:00PM CDT by NWS Green Bay WI
Nearby, since 10 March 2026
- August 11, 2026 · score 22 · 0.0 km
- August 9, 2026 · score 22 · 0.0 km
- August 8, 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, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 60% |
| Coordinates | 43.8000, -89.6000 |
| Nearest City | Wisconsin Rapids (67 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-21T03:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Watch_noaa_urn:oid:2.49.0.1.840.0.8faacdcf030064169e9ae2ce2749ebeb |
Score Breakdown
Technical Details
| Event | Tornado Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | 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; 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 |
| Headline | Tornado Watch issued July 20 at 10:53PM CDT until July 20 at 11:00PM CDT by NWS Green Bay WI |
| Expires | 2026-07-21T00:00:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8faacdcf030064169e9ae2ce2749ebebbcb65f61.001.1","noaa_urn:oid:2.49.0.1.840.0.8faacdcf030064169e9ae2ce2749ebebbcb65f61.002.1"] |
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 10 February 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.