089 FXUS63 KGRR 101833 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 233 PM EDT Sat Oct 10 2026 .KEY MESSAGES... - Rain Mid-Week then Cooler && .DISCUSSION... Issued at 232 PM EDT Sat Oct 10 2026 - Rain Mid-Week then Cooler Tropical moisture will graze southeast Lower Michigan tonight with low chance POPs there, then fair and warm weather expected into Monday before a shortwave trough rides over the top of upper ridging across the SE CONUS with a low pressure center tracking across the central Great Lakes on Tuesday. This is followed by a full latitude upper trough developing across the eastern CONUS by next weekend and the potential for a stronger low on Wed-Thu although ensemble spread remains considerable on the details. At this point it seems possible rain will be around for Wednesday and Thursday with sharply cooler weather for Friday and beyond. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 126 PM EDT Sat Oct 10 2026 Cloud cover will continue to thicken as the remnants of the tropical system move north toward the Ohio Valley. A LLJ passing to the north early tonight may result in some LLWS. Otherwise, ceilings will continue to fall to MVFR for most terminals and to IFR at BTL and JXN as precipitation gets closer. Light rain is also possible at JXN after 14z. && .MARINE... Issued at 232 PM EDT Sat Oct 10 2026 No changes to the Small Craft Advisory. Winds are still below 20 knots south of Pentwater but should be increasing this evening. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 5 AM EDT Sunday for LMZ846>849. && $$ DISCUSSION...Ostuno AVIATION...04 MARINE...Ostuno

NWS GRR Office Area Forecast Discussion