744
FXUS63 KGRR 072312
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
612 PM EST Sun Dec 7 2025

.KEY MESSAGES...

- Chances for precipitation every night this week

- Continued colder than normal

&&

.DISCUSSION...
Issued at 316 PM EST Sun Dec 7 2025

- Chances for precipitation every night this week

Latest vis loop shows come clearing moving south across the cwa
with more closed cell cu over northern lower moving toward the
cwa. High pressure was noted over Minnesota and that high will
move across the cwa later tonight and Monday.

Another in a long line of clipper will move from southwest Canada
across the northern Plains and Great Lakes Monday night producing
light snow. There`s going to be some southwest lake enhancement as
the wave moves through that will favor the northern cwa. It`s
possible 2-4 inches of snow may fall northwest of a Muskegon to
Baldwin line and 1-3 inches east of there but north of I-96.

That clipper will quickly be followed by another clipper Tuesday
night. This clipper is progd to be stronger both at the surface
and aloft , but also pull some warmer air northward. The models
have been advertising the warmer air for a few days which
increases confidence in less accumulation south of I-96. The track
of the surface low will be key to which areas see the most snow.
Models indicate the low will track across central Wisconsin and
then north of M-46. This would place the northern two rows of
counties in the coldest air which may result in 3-5 inches of snow
Tuesday night. It`s possible an inch or less of snow may fall
south of I-96 before mixing with then changing to rain. Colder air
will be pulled south across the cwa as the low moves by, most
likely changing any lingering precipitation to snow.

The core of the upper trough comes through Wednesday night and
some light lake effect snow is possible with northwest boundary
layer winds and h8 temperatures around -12c. Moisture isn`t
impressive but it`s enough to produce some light snow.

Another clipper will move across the cwa Thursday night in
northwest flow aloft producing another inch or so of light snow.

Finally, a strong cold front accompanied by a potent short wave
moves through Friday night. This will also produce some snow, but
it`s a bit early to determine accumulations.

- Continued colder than normal

Southwest Lower will remain beneath an upper trough and northwest
flow aloft through the week, which means we`ll see colder than
normal temperatures. Wednesday will be the warmest day as the low
moves across the central cwa and we get a south flow ahead of it.

Temperatures next weekend look very cold with highs in the lower
20s.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 608 PM EST Sun Dec 7 2025

Stratocumulus continues to dissipate at is moves south from
northern Lower. Not a lot of concern during the period. AZO/BTL
may see a few hours of MVFR fog just prior to sunrise but will mix
out by 8-9am. Otherwise, some high clouds are moving east across
Wisconsin and will move overhead after midnight.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 11 PM EST this evening for LMZ844>849.

&&

$$

DISCUSSION...04
AVIATION...04