Oshkosh, Wisconsin 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

560
FXUS63 KGRB 152352
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
652 PM CDT Sun Mar 15 2026

Updated aviation portion for 00Z TAF issuance
and new information added to update section

.UPDATE...
Issued at 641 PM CDT Sun Mar 15 2026

Updated the forecast and wording in the Blizzard Warning statement
to reflect a lull in the heavy snow through this evening. During
the lull, there will be periods of light snow mixed with freezing
drizzle at times. Despite the lull in the precipitation, strong
north winds gusting to 35 to 50 mph will still produce
considerable blowing and drifting snow in open areas.

Moderate to locally heavy snow will redevelop later this evening
into the overnight hours, as the strong negatively-tilted short-
wave lifts northeast into the region and deepens into an upper
low. The resulting deformation zone will bring an additional 8 to
10 inches of snow to the southeast part of the forecast area late
tonight ionto Monday morning, with 4 to 7 inches farther northwest.
This snow will be more powdery than the earlier snows, making it
more susceptible for blowing and drifting and localized whiteout
conditions. The morning commute will be a mess.

&&

.KEY MESSAGES...

- The starting time of the Blizzard Warning for the Fox Valley
  east to Kewaunee and Manitowoc County was moved up.

- A historic winter storm continues to bring significant
  disruptions to travel by car and air which is expected to
  continue through the Monday morning commute.

- Heavy snow, mixed precip, and strong winds will create blizzard
  conditions as well as widespread and significant impacts across
  the area, including extremely difficult to impossible travel and
  power outages. Blizzard Warnings are in effect until 4 pm
  Monday.

- Clipper system could bring a light accumulating snowfall Tuesday
  night and Wednesday.

- Below zero wind chills will be possible on Monday, with
  temperatures moderating back to near normal throughout the
  week.

&&

.DISCUSSION...
Issued at 316 PM CDT Sun Mar 15 2026

The historic storm continues this afternoon with significant
impacts to travel by car and air. Reports around 2 feet have been
noted towards Wausau and around a foot in Green Bay. Latest
regional radar indicated a swath of heavier precipitation from
northern Illinois into northeast WI. There was a lull in the
heavier snow across central into north-central WI. This lull in
the snow will be short-lived as another round of snow will move
into this area during the evening and then continue overnight into
Monday morning. Additional accumulations from noon today through
Monday morning will run 7 to 12 inches across central and east-
central WI to 12 to 16 inches over far northeast WI. The snow was
a wetter snow across east-central WI with a more fluffy snow over
central and north-central WI.

There was some improvement in visibilities out towards Wausau
as of 3 pm. With winds expected to increase and another round of
snow, visibilities should deteriorate again this evening. The
better probability of reaching 1/4 mile in blizzard conditions
will be tonight into Monday morning. The snow should begin to
taper off Monday morning with gradually improving visibilities
late Monday morning and afternoon. Depending on the extent
of the blowing snow, the Blizzard Warning may be downgraded
early. Winds will gradually subside Monday afternoon and Monday
night. Light snow will linger (20-40% chance) into Monday night
across the far north. Overall, the storm will likely go down
in the record books with 1 to 2 feet of snow across northern WI
with isolated amounts of 30 inches.

Otherwise, the next chance of light snow will be Tuesday night
into Wednesday. Amounts will be minimal, probably around an inch
or less. After a chilly start to the week on Monday with highs
in the teens to lower 20s, temperatures should return closer to
normal by Thursday. With all the snow on the ground and the warmer
temperatures, concerns for some river flooding will increase as
the week progresses.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 641 PM CDT Sun Mar 15 2026

There will be a lull in the heavy snow through this evening,
with improved flight conditions (MVFR/IFR) and a light mix of
snow and freezing drizzle. Heavy snow will redevelop overnight
into Monday morning, along with blizzard conditions as north winds
gusting to 35 to 45 kts produce widespread blowing and drifting
and whiteout conditions. A gradual improvement in conditions will
occur from late morning through the afternoon, with VFR possible
late in the day.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Blizzard Warning until 4 PM CDT Monday for WIZ005-010>013-
018>022-030-031-035>040-045-048>050-073-074.
&&

$$

UPDATE.........Kieckbusch
DISCUSSION.....Eckberg
AVIATION.......Kieckbusch