Severe Thunderstorm Warning 41, NWS Green Bay, WI

504 
WWUS53 KGRB 190450
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1150 PM CDT Mon May 18 2026

WIC085-125-190530-
/O.CON.KGRB.SV.W.0041.000000T0000Z-260519T0530Z/
Vilas WI-Oneida WI-
1150 PM CDT Mon May 18 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR VILAS AND NORTH CENTRAL ONEIDA COUNTIES...

At 1149 PM CDT, a severe thunderstorm was located near Lac Du
Flambeau, or 18 miles east of Turtle Flambeau Flowage, moving
northeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

This severe storm will be near...
  Boulder Junction and Rice Creek Natural Area around 1200 AM CDT.
  Border Lakes Natural Area around 1205 AM CDT.

Other locations impacted by this severe thunderstorm include Sayner,
Nixon Lake Natural Area, Hazelhurst, Woodruff, St Germain, High Lake
Natural Area, Arbor Vitae, Van Vliet Hemlocks Natural Area, Trout
Lake, and Star Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4617 8927 4572 8960 4592 9004 4598 9004
      4599 8993 4630 8993
TIME...MOT...LOC 0449Z 210DEG 49KT 4599 8982 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Eckberg

274 
WWUS53 KGRB 190505
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1205 AM CDT Tue May 19 2026

WIC085-190515-
/O.CAN.KGRB.SV.W.0041.000000T0000Z-260519T0530Z/
Oneida WI-
1205 AM CDT Tue May 19 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL ONEIDA COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

&&

LAT...LON 4604 8937 4594 8946 4611 8980 4627 8978
      4621 8946 4617 8927
TIME...MOT...LOC 0505Z 211DEG 50KT 4618 8966 

$$

WIC125-190530-
/O.CON.KGRB.SV.W.0041.000000T0000Z-260519T0530Z/
Vilas WI-
1205 AM CDT Tue May 19 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR CENTRAL VILAS COUNTY...

At 1205 AM CDT, a severe thunderstorm was located near Border Lakes
Natural Area, or 25 miles northwest of Eagle River, moving northeast
at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

This severe storm will be near...
  Border Lakes Natural Area around 1210 AM CDT.

Other locations impacted by this severe thunderstorm include Van
Vliet Hemlocks Natural Area, Sayner, Nixon Lake Natural Area, Star
Lake, Dunn Lake Natural Area, Presque Isle, and High Lake Natural
Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4604 8937 4594 8946 4611 8980 4627 8978
      4621 8946 4617 8927
TIME...MOT...LOC 0505Z 211DEG 50KT 4618 8966 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Eckberg

793 
WWUS53 KGRB 190523
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1223 AM CDT Tue May 19 2026

WIC125-190532-
/O.EXP.KGRB.SV.W.0041.000000T0000Z-260519T0530Z/
Vilas WI-
1223 AM CDT Tue May 19 2026

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL VILAS COUNTY WILL
EXPIRE AT 1230 AM CDT...

The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However, gusty
winds and heavy rain are still possible with this thunderstorm.

&&

LAT...LON 4604 8937 4594 8946 4611 8980 4627 8978
      4621 8946 4617 8927
TIME...MOT...LOC 0522Z 211DEG 50KT 4638 8948 

$$

Eckberg

Area Forecast Discussion
National Weather Service Green Bay WI
704 PM CDT Mon May 18 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- Isolated severe storms possible through tonight. Greatest
  coverage of storms northwest part of the area late this evening
  and overnight.

- Drier and cooler mid to late week. Frost or freeze headlines may
  be needed Tuesday night and Wednesday night.

- Warmer by next weekend with return of rain chances.

&&

.DISCUSSION...
Issued at 142 PM CDT Mon May 18 2026

Main concern is chance of severe storms through tonight ahead of
an approaching cold front. Modified warm front is working through
the area from the south. It is running into affects from earlier
storms to south and southeast. Subsidence to west of storms over
Michigan is resulting in minimal re-development of showers and
storms thus far. Decent cu field is blossoming over western WI
into central WI, but capping is noted on forecast soundings in
these areas rest of the day. Lowered pops to slight chance all
areas through 5p. An warm and certainly more humid day by recent
standards.

Primary convective development this afternoon into early evening
will be well to the south over the central Plains. As the warm
front lifts north, it could be enough to overcome the capping for
a few storms to develop, especially northern WI. Isolated strong
storm is possible with MUCAPE up to 1000J/kg and effective shear
of 30-40 kts. Severe threat will be higher if a storm could
become truly surfaced based and occur near the front. Wave to
north of this convection over the plains along with approaching
sfc low looks to bring best chance of a line of storms late this
evening into the overnight hours for central and north-central WI.
Main hazard with these storms will be gusty winds and heavy rain.
Isolated damaging wind gust could occur if line remains more
organized as it moves into the area. Overall the chance for severe
weather this afternoon through tonight has trended downward as SPC
has trimmed the Slight Risk out of all our forecast area.

Leftovers of this overnight line of storms shift by late tonight.
A few showers or storms may linger through the morning over eastern
WI, just ahead of cold front. The front sweeps through by early
afternoon, shifting southwest winds to northwest. Winds will be
gusty up to 30 mph. Highs could touch 70 over eastern WI, but will
be in the 60s for most, with even some 50s over north-central WI.

Beyond Tuesday, rest of the week looks generally dry. Canadian
high shifts across late Tuesday through Wednesday night. Frost or
freeze headlines may be needed Tuesday night and Wednesday night,
especially northern WI. Greatest risk is Wednesday night with
high overhead and PWATs less than 0.5 inch. Min RH will be low Wed
through Fri afternoon's. Return flow kicks in late this week into
next weekend with highs steadily returning to at or above normal.
Chances for rain and perhaps some thunder increase by next weekend.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 704 PM CDT Mon May 18 2026

Continued dry weather and VFR flying conditions are expected
through most of the evening (through ~05Z). A few showers could
pop up earlier at KRHI, and fog off Lake Michigan will impact vsby
at KMTW.

A line of rain and thunderstorms is expected to move into central
and north-central WI around 04-05Z. This will be accompanied by
lowering cigs to MVFR/IFR along with lower vsbys during periods of
heavy rain. A brief window of strong to severe storms exists from
~05-09Z in central and north-central WI (including KAUW, KCWA,
and KRHI) with wind gusts to 60 mph and small hail possible.
Otherwise, main impacts will be lightning, brief heavy rain, and
stronger wind gusts. By the time this line gets to eastern WI it
will likely weaken significantly. Included PROB30 groups for east-
central WI TAF sites as confidence in any thunderstorms reaching
these locations is low. Showers linger through ~13-14Z Tuesday
morning, then dry weather is expected for the rest of the day.
IFR/MVFR cigs are forecast through Tuesday morning in the wake of
the precipitation, with improvements to MVFR/VFR in the afternoon.

South winds veer southwest overnight, and then veer to the west-
northwest Tuesday behind the cold front, along with wind gusts to
25 kts.

&&

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

&&

DISCUSSION.....JLA
AVIATION.......KLJ

Hazardous Weather Outlook
National Weather Service Green Bay WI
827 PM CDT Mon May 18 2026

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-200130-
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-
827 PM CDT Mon May 18 2026

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

.DAY ONE...Tonight

Thunderstorm will move into central and north-central WI late this
evening and overnight. The best potential for severe storms is
from central to north-central WI between 11:00 PM to 4:00 AM. Damaging
winds are the primary threat.

.DAYS TWO THROUGH SEVEN...Tuesday through Monday

There is a chance of non-severe thunderstorms early Tuesday
morning.

Frost is possible across mainly northern Wisconsin Tuesday night
and Wednesday night.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report wind gusts greater than 40 mph
and hail to the National Weather Service in Green Bay.

LMZ521-522-541>543-200130-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
827 PM CDT Mon May 18 2026

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

.DAY ONE...Tonight

Fog will reduce visibility to less than 1 NM this evening and
overnight.

Conditions hazardous to small craft are expected on Lake Michigan
nearshore waters overnight.

There is a chance of thunderstorms late tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Monday

Thunderstorms will be possible Tuesday morning. Any thunderstorm
could pose a hazard to mariners.

Fog will reduce visibility to less than 1 NM through Tuesday
morning.

Conditions hazardous to small craft are expected through Tuesday
afternoon.

KLJ

Special Weather Statement
National Weather Service Green Bay WI
838 PM CDT Mon May 18 2026

WIZ022-190445-
Door-
838 PM CDT Mon May 18 2026

...PATCHY DENSE FOG EXPECTED THIS EVENING AND OVERNIGHT...

Areas of fog with patchy dense fog can be expected this evening
and overnight. Visibilities will drop to less than a mile in many
areas, and locally to 1/4 mile or less. Motorists should be alert
for poor and rapidly changing visibilities.

KLJ

Special Weather Statement
National Weather Service Green Bay WI
1018 PM CDT Mon May 18 2026

WIZ030-035-036-190415-
Wood WI-Marathon WI-Portage WI-
1018 PM CDT Mon May 18 2026

...STRONG THUNDERSTORMS WILL IMPACT WOOD...WESTERN PORTAGE AND
WESTERN MARATHON COUNTIES THROUGH 1115 PM CDT...

At 1018 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles north of Cadott to near Boyd to near
Humbird to near Millston to near Tomah. Movement was northeast at 50
mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Strong thunderstorms will be near...
  Babcock around 1040 PM CDT.
  Spencer and Pittsville around 1045 PM CDT.
  Marshfield around 1050 PM CDT.
  Abbotsford and Dorchester around 1055 PM CDT.
  Wisconsin Rapids around 1100 PM CDT.
  Lake Wazeecha around 1105 PM CDT.

Other locations impacted by these storms include Milladore, Sandhill
Wildlife Area, North Wood County Park, Auburndale, March Rapids,
Hewitt, Blenker, Fenwood, Bakerville, and Kellner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4502 9032 4503 9031 4504 9020 4512 9020
      4512 9009 4425 8955 4425 9032
TIME...MOT...LOC 0318Z 242DEG 42KT 4505 9111 4489 9102 4458 9081 4417
9057 4396 9045

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Eckberg

Special Weather Statement
National Weather Service Green Bay WI
1059 PM CDT Mon May 18 2026

WIZ030-035-036-045-190445-
Wood WI-Waushara WI-Marathon WI-Portage WI-
1059 PM CDT Mon May 18 2026

...STRONG THUNDERSTORMS WILL IMPACT WOOD...PORTAGE...MARATHON AND
NORTHWESTERN WAUSHARA COUNTIES THROUGH 1145 PM CDT...

At 1059 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Medford to 6 miles east of Colby to 6
miles southeast of Marshfield to near Pittsville to near New Rome.
Movement was northeast at 50 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Strong thunderstorms will be near...
  Wisconsin Rapids around 1105 PM CDT.
  Lake Wazeecha around 1110 PM CDT.
  Mosinee around 1120 PM CDT.
  Wausau, Stevens Point, Rib Mountain, and Whiting around 1125 PM
  CDT.
  Weston around 1135 PM CDT.

Other locations impacted by these storms include North Wood County
Park, Big Eau Pleine County Park, Moon, Coddington, Blenker, Fenwood,
Kellner, Ellis, Nelsonville, and Powers Bluff County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4503 9031 4504 9020 4512 9020 4512 8937
      4447 8922 4425 8923 4424 8919 4420 8960
      4425 8960 4425 9032
TIME...MOT...LOC 0359Z 229DEG 42KT 4514 9026 4489 9019 4459 9009 4441
9003 4421 8996

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Eckberg

Special Weather Statement
National Weather Service Green Bay WI
1113 PM CDT Mon May 18 2026

WIZ005-010-018-019-190515-
Vilas WI-Langlade WI-Oneida WI-Lincoln WI-
1113 PM CDT Mon May 18 2026

...STRONG THUNDERSTORMS WILL IMPACT LINCOLN...VILAS...ONEIDA AND
WESTERN LANGLADE COUNTIES THROUGH 1215 AM CDT...

At 1112 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles east of Butternut to 12 miles southwest
of Mosinee. Movement was northeast at 55 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Strong thunderstorms will be near...
  Tripoli, New Wood Wildlife Area, and Willow Lake around 1120 PM
  CDT.
  Merrill and Council Grounds State Park around 1125 PM CDT.
  Lac Du Flambeau, Tomahawk, Willow Reservoir, Squirrel Lake, and
  Birch Trails Girl Scout Camp around 1130 PM CDT.
  Gilbert around 1135 PM CDT.
  Winchester and Dutch Corners around 1140 PM CDT.
  Harrison, Woodboro, and Rice Creek Natural Area around 1145 PM
  CDT.
  Rhinelander, Newbold, and Parrish around 1150 PM CDT.
  Boulder Junction, Border Lakes Natural Area, Rainbow Flowage, and
  Crystal Lake Scout Reservation around 1155 PM CDT.

Other locations impacted by these storms include Sayner, Ackley
Wildlife Area, Bradley, Dudley, Kelly Lynn Bog Natural Area, Lower
Tomahawk River Natural Area, Harshaw, Ormsby, Hazelhurst, and Upper
Buckatabon Springs Natural Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4619 8935 4512 8922 4512 9005 4598 9005
      4598 8993 4630 8993
TIME...MOT...LOC 0412Z 225DEG 48KT 4604 9036 4468 8989

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Eckberg

Special Weather Statement
National Weather Service Green Bay WI
1133 PM CDT Mon May 18 2026

WIZ036-045-190515-
Waushara WI-Portage WI-
1133 PM CDT Mon May 18 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN PORTAGE AND
NORTHWESTERN WAUSHARA COUNTIES THROUGH 1215 AM CDT...

At 1133 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Plainfield, or 14 miles southeast of Wisconsin Rapids,
moving northeast at 40 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

This strong thunderstorm will be near...
  Plainfield around 1140 PM CDT.

Other locations impacted by this storm include Keene, Heffron,
Almond, Mount Morris, Blaine, Bancroft, Wild Rose, Hancock, and
Emmons Creek Barrens.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4424 8960 4425 8972 4430 8972 4446 8926
      4436 8922 4425 8923 4424 8918 4411 8913
      4407 8960
TIME...MOT...LOC 0433Z 245DEG 35KT 4421 8968

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Kruk