611
FXUS63 KDLH 061130
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
630 AM CDT Sun Apr 6 2025

.KEY MESSAGES...

- Light snow tonight into Monday morning for the Arrowhead and
  the South Shore snowbelt where a couple inches are possible.

- Low RH and gusty winds could increase fire weather danger
  Monday and Tuesday.

&&

.DISCUSSION...
Issued at 304 AM CDT Sun Apr 6 2025

Expect a split in temperatures across the region today. Areas
north of US Highway 2 will experience another day of below-
normal temperatures, while areas south of US-2 will see
temperatures closer to or slightly above normal.

A weak clipper and its associated cold front are expected to
move south through the Arrowhead and into the South Shore region
starting tonight and continuing into Monday morning. Lake
effect snow showers are anticipated along the South Shore,
potentially bringing a couple of inches of snow by Monday
morning. Accumulations in the Arrowhead are expected to be less
than an inch except near Grand Portage where the better forcing
is.

Following the frontal passage, Monday will be noticeably colder
across the entire area, with temperatures falling well below
normal as the coldest air associated with this system settles
in.

A significant pattern change is forecast beginning Monday as
high-amplitude ridging slowly builds into the region. This will
shut off the track for clipper systems from the north and
establish a more southerly wind flow pattern through the middle
of the week. Underneath this ridge on Monday/Tuesday, critically
low relative humidity levels between 20-25% are forecast (and
these may be too high this time of year). Winds on Monday should
be breezy though winds will decrease Tuesday, so elevated fire
weather conditions are expected Monday though not as much so on
Tuesday despite RH being lower.

The strengthening ridge will lead to a warming trend starting
Wednesday, with temperatures rising above normal. There`s also a
slight chance for light rain during this mid-week period,
particularly from the Twin Ports into northwest Wisconsin. This
precipitation chance is associated with a weak low-pressure
system forecast to move through the Lower Midwest, with our
region situated on its far northern edge.

Looking ahead to next weekend, the warming trend is expected to
continue, bringing even milder and drier conditions. High
temperatures could reach the 50s to possibly 60s across the
area.

&&

.AVIATION /12Z TAFS THROUGH 12Z MONDAY/...
Issued at 1208 AM CDT Sun Apr 6 2025

VFR through the period though a cold front may start to affect
KINL and KHYR 00Z Tuesday onward with -SN. Light westerly winds
become more northerly on Sunday and become gusty in the
afternoon. Small chance that this morning`s snow could brush
KINL, KHIB, or KDLH with a few lower clouds or even -sn
briefly.

&&

.MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/...
Issued at 305 AM CDT Sun Apr 6 2025

Winds will switch to the north tonight and become more gusty
through Monday. Waves will build along the South Shore with the
stronger winds. A little freezing spray is possible early Monday
near the eastern side of the Apostles.

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 from 8 PM this evening to 4 PM CDT Monday
     for LSZ121-145>148-150.
     Small Craft Advisory from 8 PM this evening to 10 AM CDT
     Monday for LSZ140>144.

&&

$$

DISCUSSION...Wolfe
AVIATION...Wolfe
MARINE...Wolfe