Gale Warning 9, NWS Green Bay, WI

138 
WHUS73 KGRB 070000
MWWGRB

URGENT - MARINE WEATHER MESSAGE
National Weather Service Green Bay WI
700 PM CDT Mon Apr 6 2026

LMZ521-522-541-070600-
/O.EXP.KGRB.GL.W.0009.000000T0000Z-260407T0000Z/
/O.CON.KGRB.SC.Y.0039.000000T0000Z-260407T0600Z/
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-
700 PM CDT Mon Apr 6 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 1 AM CDT
TUESDAY...
...GALE WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING...

* WHAT...North winds 10 to 20 kt with gusts up to 25 kt and 
  waves 1 to 4 ft expected.

* WHERE...Central and Southern Bay of Green Bay, and Lake 
  Michigan nearshore waters from Washington Island to Sturgeon 
  Bay.

* WHEN...Until 1 AM CDT Tuesday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LMZ542-543-070800-
/O.EXP.KGRB.GL.W.0009.000000T0000Z-260407T0000Z/
/O.CON.KGRB.SC.Y.0039.000000T0000Z-260407T0900Z/
Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI-
700 PM CDT Mon Apr 6 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 4 AM CDT
TUESDAY...
...GALE WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING...

* WHAT...North winds 10 to 20 kt with gusts up to 25 kt and 
  waves 1 to 4 ft expected.

* WHERE...Lake Michigan nearshore waters from Sturgeon Bay to 
  Sheboygan.

* WHEN...Until 4 AM CDT Tuesday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

Area Forecast Discussion
National Weather Service Green Bay WI
1119 AM CDT Mon Apr 6 2026

Updated aviation portion for 18Z TAF issuance

.KEY MESSAGES...

- Scattered snow showers today. Some of the snow showers may be
  heavy and cause brief visibility reductions/minor travel
  impacts.

- Next potential for precipitation Tuesday night through Wednesday
  night. Probabilities for at least 0.50 inch of liquid
  precipitation between 20-50%, and for at least 0.5 inch of snow
  between 20-40% mainly north and west of the Fox Valley.

- Potential is increasing for additional heavier precipitation
  late this weekend into early next week. Probabilities for at
  least 1 inch of rain between 50-70%.

- Minor flooding will continue along some rivers this week due to
  recent rainfall. Additional precipitation over the next week may
  exacerbate flooding in some areas.

&&

.DISCUSSION...
Issued at 356 AM CDT Mon Apr 6 2026

Scattered Snow Showers Today...This morning's surface
observations and satellite and radar imagery indicated flurries or
sprinkles were falling from a low stratus cloud deck at times,
which coincided with a 500mb vort max over the area. This 500mb
vort max will exit the region later this morning, but another one
is progged to move into the area by midday in addition to a
surface boundary beginning to drop south over the area. Paired
with steep low-level lapse rates and some surface instability,
CAMs remain on track with diurnally driven scattered snow showers
developing over the area. Inverted-V forecast soundings would also
indicate these bursts of snow would produce gusty winds of 25 to
30 mph, with slightly higher gusts to 35 mph over the Door
Peninsula. Given these favorable parameters, the snow showers may
become briefly heavy with visibility reduced to under a mile
through the early evening, which may impact the evening commute.
Warmer roads may limit travel impacts, but as air temperatures
fall below freezing into this evening some cooling of the roads
should still occur. Some slippery spots on untreated roads,
bridges, overpasses, and sidewalks may still occur during the
evening. Any of the snow showers will come to an end a few hours
after sunset with the loss of daytime heating and as high pressure
moves into the area. Snow accumulations will remain on the lighter
side with a dusting to a couple tenths of an inch in most spots,
but upwards of an inch in Vilas County due to this morning's
lingering lake-effect snow showers.

Colder air will trail behind this boundary tonight causing
temperatures to fall into the single digits in far north-central
WI and the teens to low 20s farther south.

Midweek Precipitation...Low-level southwest flow ahead of a low
pressure system/cold front looks to generate some WAA driven
precip over the area Tuesday night into Wednesday. Forecast
soundings indicate there may be a brief period of a wintry mix at
the onset of this precipitation before surface temps/boundary
layer temps warm above freezing. By Wednesday morning, locations
north and west of the Fox Valley could see some snowfall as probs
for at least 0.5 inch of snow are between 20-40% in these areas.
This will be follows by pre-frontal rain occurring between
Wednesday afternoon and Thursday morning. Probabilities for at
least 0.50 inch of liquid precipitation are between 20-50%, with
lower chances in far north-central WI.

Rest of the forecast...High pressure will be dominant over much of
the area on Friday, but there are indications of the southern
portions of the forecast area seeing some precip from a system
tracking south of the area. An unsettled pattern looks to set up
late this weekend into early next week, causing the potential for
heavier precipitation to increase, which long-range ensembles
support with probabilities for at least 1 inch of rain between
50-70% area-wide. Given the saturated conditions and elevated
river levels, this will be a period to watch.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 1119 AM CDT Mon Apr 6 2026

Scattered snow showers will continue into early this evening.
Conditions will generally be MVFR; however there will be breaks in
the clouds at times with VFR conditions as well as IFR/LIFR
conditions within the heavier snow showers. Flying conditions will
improve to VFR as the snow showers come to an end later this
evening.

Northwest winds will prevail through the TAF period. Gusty winds
are expected through this evening, peaking early this afternoon,
with gusts of 20 to 25 kts. However, within the heavier snow
showers, winds may gust up to 35 kts. Winds will subside below 10
kts late this evening.

&&

.HYDROLOGY...
Issued at 356 AM CDT Mon Apr 6 2026

Many area rivers across central and eastern WI remain at/near
bankfull or in minor flood stage this morning due to runoff from
recent rounds of rainfall and melting snow/sleet. The Yellow,
Peshtigo, Oconto, Embarrass, and other rivers/streams in eastern
WI will level off and slowly fall the next couple of days. The
Wolf, especially near Shiocton, will continue to slowly rise into
mid-week. No rivers are forecast to reach moderate flood stage. No
river flooding is expected across north-central WI, where less
rainfall fell and some snow is still on the ground.

The isolated rain/snow showers today will not have any impact on
the flooding. The Tuesday night and Wednesday system will bring a
little more substantial rain, but current probabilities of over
0.5" of rain (or liquid equivalent) are only between 30-50%
(highest in central WI). We will have had at least a couple days
to dry out, which will allow more water to push through the
rivers. So while the additional rainfall could slow the fall of
some river levels slightly and possibly create some minor low-
land flooding, no additional significant flooding is anticipated.
Will need to keep an eye on next weekend and/or early next week
as the flow turns southwesterly again, ushering in PWATs over an
inch and possible rounds of heavier precip, which could bring a
more substantial flooding threat.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION.....Kruk
AVIATION.......Kurimski
HYDROLOGY......Bersch

Hazardous Weather Outlook
National Weather Service Green Bay WI
225 AM CDT Mon Apr 6 2026

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-070730-
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-
225 AM CDT Mon Apr 6 2026

This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.

.DAY ONE...Today and Tonight

Brief, possibly heavy snow showers and gusty winds may lead to
short-lived reductions in visibility and hazardous travel this
afternoon, including for the evening commute.

Elevated water levels continue along many rivers with minor
flooding at a few locations.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Elevated water levels will continue along many rivers with minor
flooding at a few locations.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report any river flooding to the
National Weather Service in Green Bay.

LMZ521-522-541>543-070730-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
225 AM CDT Mon Apr 6 2026

This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.

.DAY ONE...Today and Tonight

Gusty winds and waves will create hazardous conditions to small
craft this afternoon into tonight. A few gale force gusts are
possible this afternoon, mainly north of Sturgeon Bay.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Periods of hazardous conditions to small craft are likely late
Tuesday night through Thursday. Gales are possible Wednesday
into Wednesday night.

Kruk

Special Weather Statement
National Weather Service Green Bay WI
856 AM CDT Mon Apr 6 2026

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-062100-
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-
856 AM CDT Mon Apr 6 2026

...SNOW SHOWERS WILL PROVIDE BRIEF PERIODS OF VISIBILITY
RESTRICTIONS...

Scattered snow showers developing across the region will produce
moderate to heavy bursts of snow at times through early this
afternoon. These snow showers will reduce visibilities below one
half of a mile at times.

Although significant accumulations are not expected, the sudden
reduction in visibilities could impact travel through this
afternoon. Motorists should exercise caution when traveling
through this afternoon.

Kurimski