Severe Thunderstorm Warning 151, NWS Milwaukee, WI

616 
WWUS53 KMKX 180118
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
818 PM CDT Wed Jun 17 2026

WIC105-180145-
/O.CON.KMKX.SV.W.0151.000000T0000Z-260618T0145Z/
Rock WI-
818 PM CDT Wed Jun 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTH CENTRAL ROCK COUNTY...

At 818 PM CDT, severe thunderstorms were located along a line
extending from near Darien to near Beloit to 7 miles northwest of
Rockton, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Janesville, Beloit, and Afton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Wisconsin.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4250 8930 4258 8915 4269 8901 4250 8901
TIME...MOT...LOC 0118Z 286DEG 31KT 4263 8877 4257 8899 4251 8919 

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

$$

PATTERSON

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
255 PM CDT Wed Jun 17 2026

.KEY MESSAGES...

- Widespread showers and scattered thunderstorms expected today
  into tonight. Still monitoring an isolated risk for a few
  severe storms (hail/wind) late afternoon into the evening,
  though the greatest chances will be to the south of the area.

- A Small Craft Advisory and High Swim Risk are both in effect
  for nearshore regions and beaches through late tonight. Gusty
  southeast winds will lead to high waves and dangerous
  currents.

- The next substantial chance for thunderstorms arrives Sunday
  (45-65% chances), although on and off periods of isolated to
  scattered storms are possible through much of the week.

&&

.SHORT TERM...
Issued 255 PM CDT Wed Jun 17 2026

Tonight through Thursday:

Light rain continues across the WI/IL border into this evening,
with the line of expected thunderstorms along a cold front
progressing eastward from southern Minnesota. Expecting storms
to arrive in southwestern Wisconsin around 5 PM CDT, progressing
to southeastern Wisconsin by 7 PM CDT. With plenty of cloud
cover and very little instability building into the region
(MUCAPE 500-750 J/kg riding just ahead of the cold frontal
boundary), expecting the primary hazard with this activity to be
lightning. An isolated storm may become severe in primarily
southwestern Wisconsin, with wind and hail as the main threats.
Storms will exit into Lake Michigan by sunset, with only a few
showers in central and southeastern Wisconsin lingering after
dark.

Winds are also expected to build waves up along Lake Michigan
beaches, with a High Swim Risk expected throughout this
afternoon and tonight. Stay out of the water and away from
dangerous areas like piers and breakwalls!

Winds become northwesterly overnight as low pressure exits to
the east, with gusty conditions possible in southeastern
Wisconsin Thursday morning before becoming steady midday.
Thursday afternoon, isolated thunderstorms along a weak 500 mb
shortwave are possible. No severe weather is expected with these
storms, but lightning is anticipated.

MH

&&

.LONG TERM...
Issued 255 PM CDT Wed Jun 17 2026

Thursday night through Wednesday:

Drier conditions are expected Thursday night as a surface high
pressure system begins to move in from the Plains following a
surface low. There is a slight chance for isolated precipitation
Thursday night (10-20%). As the high pressure enters from the
west Friday morning behind a cold front, primarily stable and
drier conditions are expected. However, the development of a NW-
SE jet streak over the region could bring a chance for
precipitation (20-40%) due to the upward motion following the
pattern. Temperatures for both Thursday and Friday suggest highs
in the low to mid-70s.

Into Saturday, an upper-level trough propagates eastward, with
the geopotential height gradients tightening around the upper-
level jet streak. A shortwave ridge in this region decreases the
chance for precipitation Saturday (<10%) with temperatures
rising into the upper 70s. With the tropical jet and polar jet
enhancing the jet streak, conditions favor the intensification
of a low pressure system in the Plains Saturday night, which
could create showers and thunderstorms in our region (50-70%).
As low pressure moves through Sunday, temperatures are expected
to drop into the low 70s.

Conditions are expected to become dry and warmer Monday, as a
surface high pressure system and upper-level ridge favor these
conditions. Tuesday and Wednesday still pose uncertainty with the
position of an eastward-propogating trough and a surface low in
the Plains moving toward the Mississippi River Valley. There is a
potential for showers on both Tuesday and Wednesday (10-30%), but
likelihood depends on the location of these systems.

Zawlocki

&&

.AVIATION...
Issued 255 PM CDT Wed Jun 17 2026

Southeasterly winds remain gusty at 25 to 30 kt outside of a
band of rain slowly moving across the I-94 corridor. Inside of
rain showers, gusty winds up to 20 kt are expected. Expecting
ceilings to continue to fall to become IFR by this evening and
through the overnight. Lightning chances have diminished
greatly for the afternoon, with the better chances for
thunderstorms now looking to arrive between 21Z and 00Z. A few
of these storms earlier in the evening may become capable of
producing damaging wind and hail. These storms will exit into
Lake Michigan by sunset, with showers lingering into the
overnight hours in southeast and central Wisconsin. Winds will
shift to become northwesterly overnight as well. Northwest winds
will continue into Thursday, with steady winds between 12 and 15
kt expected through much of the day. Thursday afternoon,
isolated (~15% coverage) thunderstorms are possible.

MH

&&

.MARINE...
Issued 255 PM CDT Wed Jun 17 2026

Southeasterly winds gusting consistently around 30 kt will build
waves in the southern half of Lake Michigan into this evening
as low pressure around 29.2 inches approaches. Winds will become
northeasterly in the northern half and westerly in the southern
half as low pressure crosses central portions of the open waters
late tonight. Winds in the southern half will continue to gust
near 30 kt. For both periods, a few gales are expected. Isolated
thunderstorms are also expected across the southern half this
evening.

As low pressure exits into Michigan early Thursday morning,
expect all winds to shift to become northwesterly and diminish
gradually into Thursday. Winds remain light and northwesterly
through the remainder of Thursday and through Friday as high
pressure around 30.0 inches progresses southeastward into the
Lower Mississippi Valley. Winds may briefly turn southwesterly
Friday night as weak low pressure moves through the region, but
high pressure will rapidly regain dominance by Saturday,
keeping winds light and variable. Stronger low pressure will
approach from the central Plains on Sunday, bringing more
widespread rain and thunderstorms and turning winds to
northeasterly. Northeast winds will continue into early next
week.

MH

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...Beach Hazards Statement...WIZ052-WIZ060-WIZ066-WIZ071-WIZ072
     until 4 AM Thursday.

LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 4 AM
     Thursday.

&&

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Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
210 PM CDT Wed Jun 17 2026

WIZ046-047-051-052-056>060-062>072-181915-
Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
210 PM CDT Wed Jun 17 2026

This Hazardous Weather Outlook is for portions of east central
Wisconsin, south central Wisconsin and southeast Wisconsin.

.DAY ONE...Tonight

Isolated to scattered thunderstorms are expected this afternoon
into this evening, with a few gaining the potential to produce
damaging winds and hail.

A High Swim Risk is in effect for Lake Michigan beaches through
late tonight. Gusty southeast winds will lead to life threatening
waves of 5 to 7 ft and dangerous currents. Stay out of the water
and away from dangerous areas like piers and breakwalls!

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday

Isolated to scattered thunderstorms possible Thursday and Friday.

Next noteworthy chance for widespread thunderstorm development is
Sunday.

Thunderstorm chances also develop Tuesday and Wednesday of next
week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

LMZ643>646-181915-
Sheboygan to Port Washington WI-
Port Washington to North Point Light WI-
North Point Light to Wind Point WI-
Wind Point WI to Winthrop Harbor IL-
210 PM CDT Wed Jun 17 2026

This Hazardous Weather Outlook is for the nearshore waters from
Sheboygan Wisconsin to Winthrop Harbor Illinois.

.DAY ONE...Tonight

Thunderstorms are possible this evening. A few storms may become
strong to severe, particularly further south towards Winthrop
Harbor.

A Small Craft Advisory is in effect this afternoon through late
tonight. Gusty southeast winds and high waves are expected. Winds
turn west to northwest late tonight, but waves remain elevated
into the early morning hours.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday

Next noteworthy chance for widespread thunderstorm development is
Sunday.

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-181915-
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to
mid-line of lake.-
Lake Michigan from Seul Choix Point to Rock Island Passage 5NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and North of a line from Charlevoix MI to South
Fox Island 5NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to
mid lake-
Lake Michigan from Point Betsie to Manistee MI 5NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM
offshore to mid lake-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid
Lake-
Lake Michigan from Sheboygan to Port Washington WI 5NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor to Michigan City in 5NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5NM offshore to Mid
lake-
Lake Michigan from St Joseph to South Haven MI 5NM offshore to
Mid Lake-
210 PM CDT Wed Jun 17 2026

This Hazardous Weather Outlook is for the open waters of Lake
Michigan.

.DAY ONE...Tonight

Thunderstorms are possible this evening. A few may become strong
to severe, especially across southern portions of the Lake.

A few gales are possible this afternoon into tonight over the
southern half of the lake.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday

Next noteworthy chance for thunderstorm development is Sunday.

www.weather.gov/mkx

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
648 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0639 PM     Tstm Wnd Gst     5 NW Hollandale         42.92N 90.01W
06/17/2026  M68 MPH          Iowa               WI   Public

&&

MG

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
650 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0647 PM     Tstm Wnd Gst     2 S Blue Mounds         42.99N 89.83W
06/17/2026  E60 MPH          Dane               WI   Storm Chaser

&&

MG

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
703 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0603 PM     Tstm Wnd Dmg     1 NNE Highland          43.06N 90.37W
06/17/2026                   Iowa               WI   Public

            Report of multiple trees down with at least
            one tree snapped at the base along with
            several other split or large branches down.
            Also home satellite dish ripped off the roof
            along with powerlines down around the
            property off of State Highway 80 north of
            Highland, WI. Time estimated based off of
            radar.

&&

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
709 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0704 PM     Tstm Wnd Gst     1 SSW Paoli             42.92N 89.53W
06/17/2026  M65 MPH          Dane               WI   Public

&&

MG

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
748 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0709 PM     Tstm Wnd Dmg     1 N Belleville          42.88N 89.54W
06/17/2026                   Dane               WI   Emergency Mngr

            Reports of damage to multiple structures and
            trees on the north side of Belleville, WI.
            Time estimated based on radar.

&&

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
803 PM CDT Wed Jun 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0623 PM     Tstm Wnd Dmg     1 ESE Ridgeway          43.00N 89.98W
06/17/2026                   Iowa               WI   Emergency Mngr

            Structural damage reported by Emergency
            Manager around the Ridgeway area. Time
            estimated by radar.

&&