271
FXUS63 KGRR 290756
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
256 AM EST Mon Dec 29 2025
.KEY MESSAGES...
- Snow/Wind Today
- Light Snow Tuesday Night/Wednesday
&&
.DISCUSSION...
Issued at 256 AM EST Mon Dec 29 2025
- Snow/Wind Today
Wrap around snow moving into Lower Michigan this morning as cold
air rushes in on the back side of deepening low. Model cross
sections of winds show 50 knots in the mixing layer this morning
into early afternoon in the cold advection, and wind gusts could
top 60 mph. Snow and blowing snow along with residual moisture
icing up untreated roads will cause hazardous travel into this
evening.
Inversion heights drop below 5 kft tonight as the low pulls away
and snow showers will slowly diminish into Tuesday morning.
Snow showers and blowing snow could cause persistent travel
problems into Tuesday morning west of US-131.
- Light Snow Tuesday Night/Wednesday
After a very brief break in the lake effect snow shower activity
on Tuesday, a clipper low arrives on Tuesday night in fast
northwest flow and lake-enhanced snow flares up again, persisting
into Wednesday and possibly Thursday. Accumulations currently
expected to be in the 1 to 3 inch range with the highest amounts
closer to Lake Michigan.
&&
.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 1109 PM EST Sun Dec 28 2025
Largely IFR to LIFR conditions are expected overnight into Monday.
Snow moves in from west to east 5Z to 9Z with winds building even
more from the west and then northwest Monday morning. With the
snow and winds expect whiteout conditions at times especially
along the lakeshore. Winds gusting around 40 knots are expected
initially and will peak around 50 knots during the day Monday.
Ceilings will gradually lift to MVFR during the day Monday,
however expect IFR to LIFR visibilities to linger through the day
before conditions improve Monday night as winds start to weaken to
around 25 to 35 knot gusts.
GRR Airport DSS Update
Only change would be an increase in northwest wind speeds to 50
knots starting around 8AM Monday. Otherwise the forecast remains
on track.
&&
.MARINE...
Issued at 256 AM EST Mon Dec 29 2025
No changes to the Storm Warning. Gales are occurring now and winds
will increase this morning with the peak wind gusts over 50 knots
expected between 7 AM and 2 PM today. Freezing spray is also
expected through tonight.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Winter Storm Warning until 7 PM EST this evening for MIZ039-040.
High Wind Warning until 7 PM EST this evening for MIZ046-052-059-
067-074.
MARINE...Storm Warning until 1 AM EST Tuesday for LMZ844>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...RAH
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
