771
FXUS63 KGRR 131118
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
618 AM EST Fri Nov 13 2026
.KEY MESSAGES...
- Lake effect showers into the weekend then dry and milder
&&
.DISCUSSION...
Issued at 223 AM EST Fri Nov 13 2026
- Lake effect showers into the weekend then dry and milder
The Great Lakes region is between an upper low across the NE
CONUS and a sharp upper ridge to the west as an omega block is in
place across North America. The resulting cyclonic flow will
continue through Saturday before the blocking breaks down and
heights rise by Sunday.
Lake effect rain and snow showers will gradually end this weekend
as the ridge flattens and moves east across the region, with dry
and mild conditions into mid-week. Return flow moisture and a low
moving across southern Canada could being showers by the end of
the week.
&&
.AVIATION /12Z TAFS THROUGH 12Z SATURDAY/...
Issued at 618 AM EST Fri Nov 13 2026
VFR conditions this morning except MVFR conditions early across
southeast Lower Michigan with ceilings at JXN around 1500 feet
AGL. We expect improvement to VFR there this morning as well.
North winds today AOB 10 knots. Lake effect rain and snow showers
should remain over Lake Michigan.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 7 PM EST this evening for LMZ844>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
NWS GRR Office Area Forecast Discussion
