Flash Flood Warning 9, NWS Green Bay, WI

102 
WGUS73 KGRB 242344
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
644 PM CDT Wed Jun 24 2026

WIC009-250230-
/O.CON.KGRB.FF.W.0009.000000T0000Z-260625T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Brown WI-
644 PM CDT Wed Jun 24 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM CDT THIS
EVENING FOR WEST CENTRAL BROWN COUNTY...

At 644 PM CDT, trained weather spotters reported thunderstorms
producing heavy rain in Green Bay. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Trained spotters reported flash flooding in the Green Bay
         area.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Green Bay, Bellevue Town, Oneida, De Pere, Howard, Ashwaubenon,
  Allouez, Ledgeview, Hobart, Lambeau Field and Leo Frigo Bridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4456 8819 4456 8803 4453 8794 4446 8795
      4441 8797 4441 8819

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Kurimski

084 
WGUS73 KGRB 250229
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
929 PM CDT Wed Jun 24 2026

WIC009-250239-
/O.EXP.KGRB.FF.W.0009.000000T0000Z-260625T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Brown WI-
929 PM CDT Wed Jun 24 2026

...FLASH FLOOD WARNING AT 930 PM CDT THIS EVENING FOR WEST CENTRAL
BROWN COUNTY HAS BEEN REPLACED WITH A FLOOD ADVISORY...

&&

LAT...LON 4456 8819 4456 8803 4453 8794 4446 8795
      4441 8797 4441 8819

$$

Uhlmann

Area Forecast Discussion
National Weather Service Green Bay WI
146 PM CDT Wed Jun 24 2026

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Chances for showers and storms at times through Thursday
  afternoon. Some of the storms this afternoon and evening may
  become severe, producing large hail and damaging winds.

- Near to below normal temperatures rest of this week, trending
  above normal and humid by early next week. Periodic chances
  for thunderstorms are also possible early next week, with the
  potential for severe weather.

&&

.DISCUSSION...
Issued at 146 PM CDT Wed Jun 24 2026

Precipitation/Thunder Chances...Scattered low clouds prevailed
across the region early this afternoon ahead of an impending surface
low and it's weak cold front. Decent destabilization has already
occurred over western WI early this afternoon with SBCAPE of 1500-
2000 J/kg, paired with 30-40 of effective bulk shear across central
WI. As a result, isolated storms have developed in portions of
northern WI and west-central WI, some of which have already had
reports of severe hail. Generally, scattered to numerous showers and
storms are anticipated this afternoon and evening, ending soon after
sunset with the loss of diurnal heating. SBCAPE of 1500-2000 J/kg
and deep-layer shear of 30-40 kts is anticipated during this time,
leading to updraft organization producing a mix of multicells,
supercells, and perhaps some splitting cells, aiding in a risk of
large hail up to 1.50 inches and damaging winds up to 60 mph. There
is also a very low risk for spin ups or funnel clouds due to the
proximity to the surface low and steeper low-level lapse rates,
mainly in central and north-central WI.

As the surface low and a mid-level trough move over MI on Thursday,
additional isolated showers and storms are anticipated Thursday
afternoon into the early evening, aided by up to 500 J/kg of CAPE.
However, no severe weather is expected.

Models continue to indicate a stark pattern change occurring this
weekend with an upper-level ridge building over the area before
breaking down sometime during the middle of next week. This would
bring more summer-like conditions to the area with increasing Gulf
moisture and potential ridge riders resulting in thunderstorms at
times, including possible severe storms at times. Will continue to
watch how this pattern change evolves over the coming days for any
impactful weather. At this point, the main takeaway is to plan on a
much more active weather pattern developing, with storm potential
not tied exclusively to peak heating of the day.

Fog Potential...Following the showers and storms this afternoon and
evening, some fog could occur late tonight, with best chances of
sharply reduced visibility over northern WI and maybe closer to Lake
Michigan. Agreement on this is not great though.

Temperatures...Below normal temperatures in the low to mid 70s and
comfortable humidity levels will continue through Friday.
Temperatures then gradually warm to normal on Saturday and above
normal on Sunday through early next week into the upper 80s to mid
90s due to the ridging pattern change. In addition to the much
warmer temperatures, dew points will also rise into the low to
possible mid 70s by Monday. If this pattern pans out, we could be
looking at a couple day stretch of heat-related impacts occurring.
This is already being highlighted with the NWS HeatRisk on Monday
with the Major (level 3 of 4) category and Major with some Extreme
(level 4 of 4) category on Tuesday.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 113 PM CDT Wed Jun 24 2026

Scattered to broken MVFR/low-end VFR cigs prevailed across the
region early this afternoon as isolated showers and storms began
to develop in portions of north-central and far northeast WI. The
isolated showers and storms will become more scattered in coverage
as the afternoon goes on and becoming less in coverage as the
sunsets. Decided to include TSRA with TEMPO groups at all TAF
sites when confidence is greatest. Otherwise, the showers are
anticipated to end between 02-06z Thu. Some stronger storms may
occur this afternoon and evening with hail and gusty winds being
the main threats. MVFR cigs/vsbys will also accompany the stronger
storms. Cigs are anticipated to drop to MVFR and IFR overnight
into Thursday morning. Fog may also develop late tonight across
north-central and far northeast WI, and along the lakeshore,
lifting by 12z Thu.

&&

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

&&

DISCUSSION.....Kruk
AVIATION.......Kruk

Hazardous Weather Outlook
National Weather Service Green Bay WI
116 PM CDT Wed Jun 24 2026

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-251830-
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-
116 PM CDT Wed Jun 24 2026

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

.DAY ONE...This Afternoon and Tonight

Scattered thunderstorms will diminish during the evening. A few
storms may be severe, producing large hail and damaging winds.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday

There is a small chance for thunderstorms Thursday afternoon. Severe
weather is not expected.

The chance for thunderstorms will increase early next week. It is
too early to determine if storms will be severe, but the pattern
would support severe weather.

In addition, hot and humid conditions may build across the area
early next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon.

LMZ521-522-541>543-251830-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
116 PM CDT Wed Jun 24 2026

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

.DAY ONE...This Afternoon and Tonight

Scattered thunderstorms are expected through late this evening.
Any thunderstorms will pose a hazard for mariners.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday

There is a small chance of thunderstorms Thursday afternoon. More
thunderstorms are possible Sunday through Tuesday. Any thunderstorms
will pose a hazard for mariners.

JM/Kruk

Preliminary Local Storm Report
National Weather Service Green Bay WI
600 PM CDT Wed Jun 24 2026

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

0600 PM     Hail             3 S Howard              44.52N 88.06W
06/24/2026  E0.70 Inch       Brown              WI   Trained Spotter

&&

Special Weather Statement
National Weather Service Green Bay WI
601 PM CDT Wed Jun 24 2026

WIZ031-038-242330-
Outagamie WI-Shawano WI-
601 PM CDT Wed Jun 24 2026

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT NORTHEASTERN OUTAGAMIE
AND EASTERN SHAWANO COUNTIES UNTIL 630 PM CDT...

At 601 PM CDT, Doppler radar was tracking a line of strong
thunderstorms extending from 7 miles southwest of Pulaski to 5 miles
south of Navarino Wildlife Area, or extending from 16 miles west of
Green Bay to 14 miles south of Shawano, moving southeast at 20 mph.

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

SOURCE...Radar indicated.

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

The strong thunderstorm will be near...
  Navarino Wildlife Area around 605 PM CDT. Black Creek around 625 PM
  CDT.

Other locations impacted by this strong thunderstorm include Leeman,
Nichols, Rose Lawn, Briarton, Navarino, Hofa Park, Laney, Angelica,
Oneida and Chicago Corners.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4467 8861 4464 8841 4469 8828 4462 8824
      4459 8825 4459 8823 4450 8819 4445 8819
      4439 8821 4437 8850 4466 8861
TIME...MOT...LOC 2301Z 320DEG 16KT 4458 8830 4454 8840 4457 8854

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Kurimski

Preliminary Local Storm Report
National Weather Service Green Bay WI
604 PM CDT Wed Jun 24 2026

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

0550 PM     Hail             Mosinee                 44.78N 89.69W
06/24/2026  M0.70 Inch       Marathon           WI   Public

&&

Preliminary Local Storm Report
National Weather Service Green Bay WI
605 PM CDT Wed Jun 24 2026

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

0601 PM     Hail             2 S Howard              44.53N 88.06W
06/24/2026  E1.25 Inch       Brown              WI   Public

            Report from mPING: Half Dollar (1.25 in.).

&&

Preliminary Local Storm Report
National Weather Service Green Bay WI
608 PM CDT Wed Jun 24 2026

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

0603 PM     Hail             1 SE Howard             44.55N 88.05W
06/24/2026  M1.50 Inch       Brown              WI   Public

&&

Preliminary Local Storm Report
National Weather Service Green Bay WI
620 PM CDT Wed Jun 24 2026

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

0600 PM     Hail             2 SW Howard             44.54N 88.10W
06/24/2026  M1.75 Inch       Brown              WI   Public

&&