079 FXUS63 KGRR 121115 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 715 AM EDT Fri Sep 12 2025 .KEY MESSAGES... - Chance of Rain Saturday && .DISCUSSION... Issued at 137 AM EDT Fri Sep 12 2025 - Chance of Rain Saturday Overall dry pattern continues into next week with only a chance of showers Saturday morning. Convection forms on the nose of a LLJ across Wisconsin late Friday night and translates southeast across Lower Michigan Saturday morning while slowly dissipating as the LLJ weakens. QPF and POPs are lowered a bit from yesterday. Instability and shear profiles suggest thunder chances are isolated at best. The majority of the next several days will see sfc high pressure edging down from Canada with dry north or northeast flow. Gulf moisture remains effectively cut off into next week. It may be the end of next week before the next chance of any rain appears. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 715 AM EDT Fri Sep 12 2025 VFR conditions will continue through tonight. Light and variable winds this morning becoming southwest AOB 10 knots by this afternoon. && .MARINE... Issued at 137 AM EDT Fri Sep 12 2025 Winds and waves will be light into next week. Lake breezes in the afternoon will see southwest winds AOB 10 knots, otherwise light offshore flow can be expected. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...Ostuno AVIATION...Ostuno MARINE...Ostuno

NWS GRR Office Area Forecast Discussion