Special Weather Statement, NWS Green Bay, WI

Area Forecast Discussion
National Weather Service Green Bay WI
256 PM CDT Mon May 24 2021

Forecast discussion for routine afternoon forecast issuance

.SHORT TERM...Tonight and Tuesday
Issued at 256 PM CDT Mon May 24 2021

A warm front was lifting northward across the area this afternoon.
Temperatures warmed into the in the lower to middle 70s north and
in the upper 70s to middle 80s. An isolated shower/storm was
developing just west of Marathon Co.

For tonight, an upper level disturbance will swing across the
western Great Lakes region this evening. The best forcing will
be across the northwest half of the state. Have highlighted the
best chance of storms north and west of the Fox Valley. Surface
based and most unstable capes of 500 to 1,500 J/KG were noted
across eastern Minnesota into west-central Wisconsin. 0-6 km
shear values fairly low for organized severe weather. There could
be an isolated strong or severe storm across north-central
Wisconsin late this afternoon until mid evening. Damaging winds
and locally heavy rainfall are the main risks.

Another disturbance will move across the area overnight, bringing
continued chances of showers and storms. There will be ongoing
showers and storms across portions of the area. Lingering cloud
cover and lingering showers/storms could impact the potential for
severe storms Tuesday afternoon. It will be warm and humid with
highs in the lower to middle 80s.

.LONG TERM...Tuesday Night Through Monday
Issued at 256 PM CDT Mon May 24 2021

Precipitation will be coming to an end from west to east Tuesday
evening as a cold front sweeps through the western Great Lakes
region. Temperatures will then cool down a bit for Wednesday with
dry conditions expected through much of Wednesday night.

Another low pressure system will bring active weather back to the
region Thursday and Friday as it slowly tracks across the southern
Great Lakes as daytime temperatures cool even further into the
50s. Behind this low pressure system, high pressure will build in
across the western Great Lakes region. Low temperatures on Friday
night will fall precipitously into the 30s and 40s with light
winds and mostly clear skies. Some frost and freeze conditions
will be possible given the cool temperatures, especially across
north-central Wisconsin.

The high will keep the weather dry across the region for the first
half of the weekend, as high temperatures rebound into the 60s for
Saturday. Several weak low pressure systems will bring several
opportunities for rain Sunday and Monday as temperatures warm
further into the 70s during the daytime hours.
&&

.AVIATION...for 18Z TAF Issuance
Issued at 1150 AM CDT Mon May 24 2021

IFR CIGS across northern Wisconsin will improve into the VFR
category this afternoon. The only exception will be near the Lake
Michigan shoreline where some lake fog will linger at least
through the afternoon if not into tonight. The lake fog could
impact KMTW this afternoon, and at K2P2 through tonight. Scattered
thunderstorms are expected to develop across the northwest half
of Wisconsin. Some of these storms could impact KRHI/KAUW/KCWA
late this afternoon into early this evening. Some of these could
be become strong or severe with strong winds and poor
visibilities. Additional showers and perhaps a few thunderstorms
will move across northern Wisconsin overnight as well. Low CIGS
are expected to develop across northern Wisconsin late tonight
into Tuesday morning which should clear by mid to late morning on
Tuesday. Strong or severe storms are possible again on Tuesday
afternoon.
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM.....Eckberg
LONG TERM......Kurimski
AVIATION.......Eckberg

Hazardous Weather Outlook
National Weather Service Green Bay WI
234 PM CDT Mon May 24 2021

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-251945-
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-
234 PM CDT Mon May 24 2021

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

.DAY ONE...Rest of the Afternoon and Tonight

Scattered thunderstorms are possible late this afternoon and
tonight. A few of these storms could become strong with gusty
winds and heavy rainfall, especially in north-central Wisconsin
and far northeast Wisconsin late this afternoon and early this
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Monday

Thunderstorms are possible Tuesday afternoon and evening. A few
of these storms could become severe, with damaging winds and
gusty winds and large hail.

Mostly clear skies and light winds will allow temperatures to fall
into the 30s across north-central and central Wisconsin Friday
night into early Saturday morning. Areas of frost are possible
across north-central Wisconsin due to these cold temperatures.

.SPOTTER INFORMATION STATEMENT...

Spotters should relay reports of wind gusts in excess of 40 mph,
hail, or rainfall in excess of an inch to the National Weather
Service.

LMZ521-522-541>543-251945-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
234 PM CDT Mon May 24 2021

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

.DAY ONE...Rest of the Afternoon and Tonight

Dense marine fog will linger into this evening on Lake Michigan.

Thunderstorms are expected this afternoon and evening, but severe
weather is not anticipated.

.DAYS TWO THROUGH SEVEN...Tuesday through Monday

A Small Craft Advisory will likely be needed Tuesday and Tuesday
night, due to gusty southwest winds and building waves.

Thunderstorms are possible on Tuesday, mainly during the afternoon
and evening hours. A few storms could be strong, with gusty winds
and hail.

Eckberg/Kurimski

Special Weather Statement
National Weather Service Green Bay WI
646 PM CDT Mon May 24 2021

WIZ018-030-250030-
Marathon-Lincoln-
646 PM CDT Mon May 24 2021

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN LINCOLN
AND NORTHERN MARATHON COUNTIES...

At 643 PM CDT, a cluster of strong thunderstorms was centered about
15 miles southwest of Council Grounds State Park, or 20 miles
northwest of Wausau, moving northeast at 35 mph.

Brief wind gusts to around 30 mph, half inch hail, and heavy
rainfall are possible with the storms.

Locations impacted include...
Merrill, Birch Trails Girl Scout Camp, Council Grounds State Park,
Dutch Corners, Athens, Rib Falls, Hamburg, Dudley, Little Chicago and
Poniatowski.

This includes the following highways...
 Wisconsin Highway 29 near mile marker 149.
 U.S. Highway 51 between mile markers 195 and 203, and between mile
markers 205 and 221.

If outdoors, consider seeking shelter inside a building until the
storms pass.

LAT...LON 4512 9005 4521 9004 4530 8990 4541 8945
      4503 8946 4494 9001 4510 9020 4512 9020
TIME...MOT...LOC 2343Z 238DEG 29KT 4506 8999

Skowronski