Alert archive / Wisconsin / Flood Watches in 2026
Flood Watch 4, NWS Green Bay, WI
NWS Green Bay, WI issued this flood watch at Apr 16, 2026, 1:33 PM CDT for 19 counties in Wisconsin. It took effect at Apr 17, 2026, 1:00 PM CDT. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Apr 16, 2026, 1:33 PM CDT (18:33 UTC)
- In effect from
- Apr 17, 2026, 1:00 PM CDT
- Expired
- Apr 18, 2026, 2:15 AM CDT
- In force
- 13 hr
- Issued by
- NWS Green Bay, WI
- Flood severity
- None
Counties Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 46 km from the middle of the area, began a volume at 18:35 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 6.6 hours before the alert went out and 395 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1800 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before this flood watch went out at Apr 16, 11:48 AM CDT, 1 hour 45 minutes earlier.
Area forecast discussion, Apr 16, 11:48 AM CDT, 1 hour 45 minutes before
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</html>Hazardous weather outlook, Apr 16, 10:19 AM CDT, 3 hours 14 minutes before
Hazardous Weather Outlook National Weather Service Green Bay WI 1019 AM CDT Thu Apr 16 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-171530- Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln- Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano- Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago- Calumet-Manitowoc-Southern Marinette County- Southern Oconto County- 1019 AM CDT Thu Apr 16 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...This Afternoon and Tonight Areas of dense fog may redevelop across eastern Wisconsin tonight. Flooding is expected to continue due to recent heavy rainfall. FLooding concern is greatest near rivers, streams, and creeks. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Thunderstorms, some potentially severe with locally heavy rain, will impact the area Friday afternoon and evening. Hazards include large hail, a few tornadoes, and damaging winds. Flooding may occur, especially in urban areas, and locations already impacted by heavy rain earlier in the week. Flooding will occur on some area rivers and streams into next week. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report any flooding to the National Weather Service in Green Bay. LMZ521-522-541>543-171530- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 1019 AM CDT Thu Apr 16 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...This Afternoon and Tonight Areas of fog are expected across the nearshore and open waters through tonight. A Dense Fog Advisory is in effect. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Thunderstorms will occur Friday night. Any thunderstorms could be hazardous to boaters. JM
The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 11:16 AM CDT | River Flood Warning | GRB | Marinette | 21 days |
Nearby
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.