NWS Marquette, MI wrote its last area forecast discussion before the first event at Jan 8, 6:37 PM CST, 2 hours 23 minutes earlier. Its key messages:
Area forecast discussion, Jan 8, 6:37 PM CST, 2 hours 23 minutes before
Area Forecast Discussion
National Weather Service Marquette MI
737 PM EST Thu Jan 8 2026
.KEY MESSAGES...
- Rain will change to snow tonight across the western half of Upper
Michigan. Snowfall amounts of 3-6 inches is expected for interior
areas south and west of Marquette. See the latest Winter Weather
Advisory for additional information.
- Moderate rainfall tonight into Friday morning across southern and
eastern Upper Michigan may result in isolated flooding and ponding
on roadways, especially where storm drains are covered by snow.
- Widespread light to moderate snowfall is possible Saturday into
Saturday night. There continues to be uncertainty about the track of
this system though. Interested parties should keep an eye on future
forecasts.
&&
.DISCUSSION...
Issued at 222 PM EST Thu Jan 8 2026
Abundant moisture below a low level inversion has kept most of the
region under cloudy skies this morning, but clearing was observed
near the lakeshore and interior west. Pockets of fog/mist and
drizzle were noted by surface observations and webcams, with
improvement taking place as the hours progressed and mixing
increased. Temperatures have been observed in the 30s.
GOES 16 water vapor imagery highlights an expansive region of deep
moisture over central CONUS associated with a surface low currently
analyzed over Kansas. Upstream from there, deep mid to upper level
troughing is observed digging south through the Rockies with
multiple impulses scattered throughout. As the week concludes and
the weekend progresses, these features will press east and
northeast, gradually transitioning into a split flow regime thanks
to a reinforcing shortwave exiting the Canadian Rockies. This
ultimately ends with a closed upper level low exiting the Great
Lakes Sunday night. As this system pulls away, northwest flow aloft
establishes itself across western CONUS, enabling the migration of
multiple shortwaves/clippers toward the Great Lakes next week. As
this pattern evolves, there are two systems of note tonight and
again Saturday, that may result in impactful precip across the
region.
For tonight, the upstream low is expected to lift northeast into the
Great Lakes region this evening, eventually transiting northern Lake
Michigan Friday morning, before it continues its journey into
Ontario through the day. Latest CAMS bring precip into the south-
central around 8pm EST and then overspread the east/central/west
thereafter - ending from west to east Friday morning. Favorable
upper level jet dynamics and strong low level fgen will support QPF
values approaching an inch across the east half which will be closer
to the surface low. Much of this will fall as rain overnight for
lakeshore areas of Lake Superior and in areas east of a line drawn
from Munising to Menominee before mixing with snow Friday morning,
while parts west of this line and removed from the lakeshore cool
fast enough for rain to transition to snow tonight. Model soundings
show this progression well and generally have this rain to snow
transition occuring near midnight west of that line. Additionally,
most guidance now removes the potential for freezing rain. With this
said though, I won't rule out some potential for freezing rain
because temperatures will be close to freezing for most of the
overnight period. Rainfall rates though may limit any ice
accumulation. There are questions about how impactful this rain
could be given anticipated values of 1-1.5 inches and NOHRSC
analysis of 4 to 20+ inches of snow depth, but areas with low lying
roadways or with poor drainage should at least expect ponding.
Where precip transitions to snow tonight, accumulations are likely
to range from a trace to near 7 inches. The highest accumulations
are expected across the higher terrain of Baraga and Marquette
counties, where orographic enhancement should support snowfall rates
close to 1 inch per hour at times. Other areas west of Marquette
along US-41 and southwest into the interior, including M-95 and 141,
and US-2 between Iron Mountain and Watersmeet are likely to see 2-4
inches. Snow character is expected to be wet, especially in the
first few hours of snowfall. Given this and latest HREF suggesting
snowfall rates >0.5 inches per hour in these locations, opted to
expand the Winter Weather Advisories to southern Houghton,
Ontonagon, Gogebic, and Iron counties.
The second system of note organizes Friday night, as a shortwave
presses eastward through North Dakota and a southern stream begins
to lift out of the Southern Plains. These two phase over the Upper
Great Lakes, resulting in a surface low somewhere from Lake Huron to
Lake Erie. Latest 12z ensemble membership of the EC, GEFS, and GEPS
guidance packages continue to handle this event somewhat poorly,
while deterministic guidance packages continue to present a more
consistent scenario of a deepening low over Lake Huron. Should the
latter occur, an inverted trough stretching northwest into western
Upper Michigan Saturday would be the focus for widespread light to
moderate snowfall before deformation zone snow wraps around the low
from the northeast Saturday night, prolonging the light to moderate
snow in areas downwind of Lake Superior. This also results in a
tighter pressure gradient over the region by Saturday night,
supporting stronger northeast to northerly winds. Should the more
eastward solutions occur though, light winds, and maybe some light
snow would be expected. Given the run to run consistency of the
deterministic packages, am leaning toward those (the widespread
light to moderate snow) being the more likely; however, confidence
in this outcome is only medium (~50%).
Otherwise, daytime temperatures look to peak in the low 30s Friday,
with a drop back into the 20s for the weekend. Overnight lows
tonight will be more mild than average, but the west half can expect
to fall to near or just below freezing while the east bottoms out
near or just above freezing. Afterwards, overnight lows mostly in
the teens are expected for the weekend. Low level warm air advection
next week will allow temperatures to oscillate above or to near
freezing Monday and Tuesday, then fall back below freezing
overnight.
&&
.AVIATION /00Z TAFS THROUGH 00Z SATURDAY/...
Issued at 737 PM EST Thu Jan 8 2026
LIFR/VLIFR conditions to prevail at all TAF sites through at least
tomorrow morning. Fog and low ceilings continue to impact TAF sites
this evening. And, conditions will not improve as a low pressure
system passes to the south of the UP tonight. This will bring rain
to all TAF sites, which will transition to a rain/snow mix and
eventually all snow. The FZRASN threat has diminished, but still
cannot entirely be ruled out in the transition. IWD and CMX could
see a return to VFR by tomorrow afternoon in the wake of the system,
but SAW will likely only improve to MVFR levels. In addition, winds
will become northwesterly with frontal passage and strong early
tomorrow morning. Gusts will be in the 30 to 35 kt range at CMX
and SAW.
&&
.MARINE...
Issued at 210 PM EST Thu Jan 8 2026
Southerly winds falling below 20kts this afternoon veer northerly
over the western end of the lake by the early evening, and across
the rest of the lake overnight. Expect gusts to increase to 20-25kts
from west to east after midnight, then gales to 35kts develop
Friday morning over the eastern half of the lake. Winds fall back
below 20kts from west to east Friday evening while backing to the
south. Models continue to hint at the potential for a stronger
system to impact the region over the weekend as another low develops
in the vicinity of Lower Michigan, but forecast confidence remains
low with respect to placement, timing, and evolution of this
feature. Will continue to monitor in the coming days as these
details will have large implications for potential Gales and
freezing spray over Lake Superior this weekend. The latest NBM
continues to depict a 40-50% chance for northerly Gales developing
across central and eastern Lake Superior late Saturday into Sunday,
which is reflected in the current forecast.
&&
.MQT WATCHES/WARNINGS/ADVISORIES...
Upper Michigan...
Winter Weather Advisory until 7 AM EST /6 AM CST/ Friday for
MIZ002-009-010-084.
Winter Weather Advisory from 11 PM this evening to 10 AM EST
Friday for MIZ004-005.
Lake Superior...
Gale Warning from 7 AM to 4 PM EST Friday for LSZ244-245-
248>250-265-266.
Gale Warning from 10 AM to 4 PM EST Friday for LSZ251-267.
Lake Michigan...
None.
&&
DISCUSSION...JTP
AVIATION...TDUD
MARINE...LC