089
FXUS63 KGRR 102035
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
335 PM EST Wed Dec 10 2025

.KEY MESSAGES...

- Light Lake Effect Snow Tonight

- Lake Effect Snow Friday and Saturday

- Arctic Air into Early Next Week

&&

.DISCUSSION...
Issued at 335 PM EST Wed Dec 10 2025

- Lake Effect Snow Friday and Saturday

The steady snow has ended as the trowal feature associated with
the cyclone has moved off to the east. Lake effect snow showers
expected to drop an inch or two of fluffy snow across the
northwest and southwest zones tonight in northwest flow.

Inversion heights lower as surface high with subsidence and drying
building in on Thursday, ending the snow showers and allowing
another cold night with temperatures potentially dropping below
10F if skies clear out.

- Lake Effect Snow Friday into Saturday

An arctic cold front arrives on Friday along with a shortwave
trough that raises inversion heights to around 10 kft, and we
expect lake effect snow to perk up in southwest to west flow
during the afternoon. POPS and QPF have been adjusted upwards
Friday afternoon into Saturday given onshore flow and strong lake
instability. Expect some areas to get 3 to 5 inches of snow before
inversion heights fall and snow showers decrease on Saturday.

- Arctic Air into Early Next Week

A vast area of arctic air pooling across northwest Canada surges
southeast by the weekend, with a lobe of the polar vortex reaching
Lower Michigan by Sunday. 850 MB temperatures plunge below
minus 20C and should result in high temperatures being confined
to the teens or even single numbers on Saturday and possibly
Sunday with wind chills approaching minus 10F.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 1237 AM EST Wed Dec 10 2025

The frontal band of snow showers will continue to move to the
southeast as the day progresses. Widespread IFR cigs and vsbys in
snow showers will continue into the afternoon. The cold front is
moving in from the northwest which will allow for dry
northwesterly flow to overtake the region this afternoon. Cigs and
vsbys will improve this afternoon beginning from thE NW to the SE
from MKG and GRR then followed by LAN, AZO, BTL and then lastly
JXN. This should occur beginning from around 18Z until 22Z.
Ceilings and visibilities will improve behind the front with a
period of MVFR between 22Z until 03Z. After 03Z VFR conditions
will then infiltrate as skies improve from NW to SE. There is the
potential for post frontal snow showers this evening which could
bring MVFR vsbys and cigs to MKG. There also is the potential for
some MVFR cigs tomorrow between 12Z and 18Z.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 4 PM EST Thursday for LMZ844>849.

&&

$$

DISCUSSION...Ostuno
AVIATION...Ceru