733
FXUS63 KDLH 060539
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
1239 AM CDT Mon Apr 6 2026

.KEY MESSAGES...

- Localized rain and snow showers today. Quick and minor snow
  accumulations most likely for the Borderland and Arrowhead.
  Snow showers last into Monday afternoon.

- Locally higher snowfall totals of 2-5" along the South Shore
  late tonight into Monday morning.

- Seasonably cold temperatures Tuesday morning being a few
  degrees either side of Zero.

- Next chance of precipitation Wednesday with a potential
  rain/snow mix.

- Extended Period Heads up: 40-60% chance of heavy precipitation
  primarily for Northwest Wisconsin Sunday April 12 to Monday
  April 13.

&&

.DISCUSSION...
Issued at 130 PM CDT Sun Apr 5 2026

Parts of the Northland are currently seeing a brief break in
active weather this afternoon, but a fast-moving clipper system
is already approaching from the northwest. For the rest of the
day, expect increasing cloud cover with rain and snow showers
developing from northwest to southeast. Robust convective snow
showers are most likely this evening across Koochiching,
northern Itasca, and northern St. Louis counties. Under these
heavier bursts, a quick inch of snow could accumulate,
accompanied by a rapid reduction in visibility that may catch
evening travelers off guard. High temperatures today will remain
in the upper 30s to lower 40s.

Tonight, a second wave of energy will push through as colder air
begins to surge into the region. This will transition all
precipitation to snow. A 6 to 12-hour window of moderate snowfall
is expected along the South Shore, particularly for Iron County,
starting late tonight and lasting through Monday morning. Total
snowfall accumulations of 2 to 5 inches are forecast for these
lake-effect prone areas. Elsewhere, lighter snow showers will
persist overnight with low temperatures dropping into the mid
teens to low 20s.

On Monday, a very cold air mass for early April will settle over
our area. Residual low-level instability and steep lapse rates
will likely trigger more robust snow showers during the midday
hours in northern Wisconsin, especially from Ashland and Sawyer
counties eastward into north-central Wisconsin. There is a
distinct potential for snow squalls in this corridor, which
could produce brief whiteout conditions. High temperatures will
be significantly below normal, struggling to reach the upper 20s
to low 30s. Northwest winds will also be gusty, reaching 25 to
30 mph at times, adding a bite to the air.

Monday night into Tuesday morning looks to be the coldest period of
the week as high pressure settles directly over the region. With
clear skies and diminishing winds providing an ideal setup for
radiational cooling, temperatures will tank. Lows are forecast to
range from 5 above zero to 5 below zero, which may challenge daily
record lows for April 7th. Despite the frigid start, Tuesday will
feature plenty of sunshine with highs recovering into the upper
30s as winds shift to the south.

The next weather system arrives Tuesday night into Wednesday as
warmer and more moist air returns. This will bring widespread
precipitation chances to the area. Current indications suggest a
mix of snow and freezing rain may occur early Wednesday morning
before transitioning to all rain by Wednesday afternoon as
temperatures climb into the 40s and even low 50s for some
southern zones. This active pattern looks to linger into
early Thursday with additional rain and snow showers possible.

Looking toward the end of the week and next weekend, a general
warming trend is anticipated with highs returning to the 40s on
Friday and potentially the 50s by Saturday. However, we are
watching a more significant system for the following Sunday
April 12 and Monday April 13. Long-range outlooks provided by
the Climate Prediction Center favor a 40 to 60 percent chance of
heavy precipitation, primarily for northwest Wisconsin.
Depending on the track, this could be a heavy rain event which,
combined with snowmelt, may lead to rising river levels across
the South Shore and the Minnesota Arrowhead.

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 1237 AM CDT Mon Apr 6 2026

A cold front is traversing across the region this morning with gusty
winds out of the northwest. Still have some scattered snow showers
on radar that could occasionally move over the terminals. Ceilings
vary widely ranging from IFR to MVFR to VFR as these showers move
through the region. Northwest flow through the day may lead HCRs
developing this afternoon if we can maintain some low level
moisture. If these do manage to form expect scattered snow
showers to persist. Dry air and overtakes the region with skies
clearing out this evening.

&&

.MARINE /FOR NEARSHORE WATERS OF WESTERN LAKE SUPERIOR/...
Issued at 1250 PM CDT Sun Apr 5 2026

North to northwest winds return Monday, gusting again
20-30 knots so Small Craft Advisories have again been issued
late tonight through Monday afternoon. Peak winds are most
likely Monday morning into midday, and then those winds should
start to weaken Monday afternoon. Elevated wave heights linger
last along the South Shore Monday evening. Tuesday should
feature mostly weak winds, becoming southerly through the day.
With those south winds, there still could be some stronger gusts
up to 20 knots between Grand Portage and Isle Royale.

For the open water discussion, refer to the NWS Marquette Area
Forecast Discussion at weather.gov/mqt.

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...None.
WI...None.
MARINE...Small Craft Advisory until 1 PM CDT this afternoon for
     LSZ140>146.
     Small Craft Advisory until 4 PM CDT this afternoon for LSZ147-
     148-150.

&&

$$

DISCUSSION...Levens
AVIATION...Britt
MARINE...NLy