175
FXUS63 KGRR 120708
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
208 AM EST Thu Nov 12 2026
.KEY MESSAGES...
- Lake Effect Rain and Snow Showers
&&
.DISCUSSION...
Issued at 208 AM EST Thu Nov 12 2026
- Lake Effect Rain and Snow Showers
Cyclonic flow continues across Lower Michigan through Saturday as
an amplified omega block forms over the CONUS with upper
troughing to the east and a sharp ridge to the west. Lake effect
rain and snow showers will be confined to mostly near and off the
Lake Michigan coast in north flow. Some light snow accums are
possible across the northwest zones.
The blocking regime breaks down over the weekend and showers end
as heights rise. The amplified riding flattens as it moves east
bit should bring dry and mild weather into the middle of next
week.
&&
.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 208 AM EST Thu Nov 12 2026
MVFR with patchy IFR conditions can be expected overnight and into
Thursday as low stratus clouds move through with lake effect
showers mostly remaining over Lake Michigan. North to northeast
winds around 10 knots overnight with some gusts to 20 knots on
Thursday afternoon.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 7 PM EST Friday for LMZ844>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
NWS GRR Office Area Forecast Discussion
