Alert archive / Wisconsin / Flood Watches in 2026

Flood Watch 3, NWS Green Bay, WI

April 15, 202610 counties in Wisconsin

NWS Green Bay, WI issued this flood watch at Apr 15, 2026, 2:30 PM CDT for 10 counties in Wisconsin. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Apr 15, 2026, 2:30 PM CDT (19:30 UTC)
Expired: Apr 15, 2026, 10:47 PM CDT
In force: 8 hr
Issued by: NWS Green Bay, WI
Flood severity: None

Counties Brown County, WI, Calumet County, WI, Kewaunee County, WI, Manitowoc County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 24 km from the middle of the area, began a volume at 19:34 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, 7.5 hours before the alert went out and 417 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 937 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 15, 2:00 PM CDT, 30 minutes earlier.

Area forecast discussion, Apr 15, 2:00 PM CDT, 30 minutes before

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Hazardous weather outlook, Apr 15, 2:05 PM CDT, 25 minutes before

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The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 14, 7:00 PM CDT	Special Weather Statement	GRB	Marathon	45 min
Apr 14, 7:03 PM CDT	Special Weather Statement	GRB	Winnebago	27 min
Apr 14, 7:19 PM CDT	Special Weather Statement	GRB	Winnebago	41 min
Apr 14, 7:39 PM CDT	Areal Flood Advisory	GRB	Calumet, Winnebago	92 min
Apr 14, 9:03 PM CDT	Areal Flood Warning	GRB	Portage, Wood	7 hr
Apr 14, 9:11 PM CDT	Flash Flood Warning	GRB	Brown	3 hr
Apr 14, 9:42 PM CDT	River Flood Warning	GRB	Marinette	8 days
Apr 14, 9:48 PM CDT	River Flood Warning	GRB	Marinette	48 hr
Apr 14, 9:59 PM CDT	Special Weather Statement	GRB	Waushara	46 min
Apr 14, 10:56 PM CDT	Special Weather Statement	GRB	Waupaca	34 min
Apr 15, 2:34 AM CDT	Areal Flood Warning	GRB	Brown, Door, Kewaunee, Manitowoc, Oconto, Outagamie and 4 more	11 hr
Apr 15, 2:58 AM CDT	Dense Fog Advisory	GRB	Brown, Calumet, Door, Florence, Forest, Kewaunee and 13 more	7 hr
Apr 15, 7:29 AM CDT	River Flood Warning	GRB	Manitowoc	29 hr
Apr 15, 8:07 AM CDT	River Flood Warning	GRB	Marinette	21 days
Apr 15, 12:09 PM CDT	River Flood Warning	GRB	Marinette	21 days
Apr 15, 1:21 PM CDT	Areal Flood Warning	GRB	Menominee	21 hr
Apr 15, 2:19 PM CDT	Dense Fog Advisory	GRB	Brown, Calumet, Door, Florence, Forest, Kewaunee and 16 more	20 hr

Nearby

Flood Watches in Wisconsin, 2026 Every flood watch in 2026

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.