490
FXUS63 KGRR 212243
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
543 PM EST Sun Dec 21 2025
.KEY MESSAGES...
- No major impacts to travel this week
&&
.DISCUSSION...
Issued at 250 PM EST Sun Dec 21 2025
- No major impacts to travel this week
Surface high moves east tonight with an area of warm advection
approaching from the west. Moisture return on the back side of the
high will combine with the isentropic ascent to produce an area
of light snow on Monday across much of the forecast area. Expect
an inch or less across roughly the northern half of the forecast
area with temperatures close to freezing. Some untreated roads
could be slippery, otherwise no impacts expected.
A thaw period with temperatures mostly above freezing can be
expected for mid-week including Christmas Day. Rain is expected
Thursday followed by a return of cold air next weekend. Ensemble
spread is large by the end of the week, so confidence is low in
the details, but strong height falls are indicated with the
potential for lake effect snow by late in the weekend and early
next week.
&&
.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 543 PM EST Sun Dec 21 2025
VFR cigs with west to southwest winds start the TAF period.
Intermittent MVFR cigs should clear MKG by to shortly after 00z.
The passage of a warm front aloft will cause cigs to lower to
7-10 kft overnight. Winds will veer to southeasterly by Monday
afternoon. There is a low (30%) chance of snow showers at
GRR/MKG/LAN, though low- level moisture (a lack thereof
specifically) will be the main limiting factor as to any reaching
the terminals. If any do, MVFR visbys are possible. Any potential
showers clear by late afternoon.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...Thomas
NWS GRR Office Area Forecast Discussion
