751 FXUS63 KGRR 122323 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 723 PM EDT Mon Oct 12 2026 .KEY MESSAGES... - Three Chances for Rain This Week, then Cooler && .DISCUSSION... Issued at 256 PM EDT Mon Oct 12 2026 - Three Chances for Rain This Week, then Cooler An area of warm advection/isentropic ascent could bring a few showers and a low chance of thunder tonight, but moisture is limited and most places will remain dry. More rain is possible on Tuesday night into Wednesday as moisture pools along a stationary front draped across the southern forecast area, but most of the precip should remain to the south. Widespread rain arrives on Thursday as a shortwave trough digs across the region with a vigorous surface low tracking through the Great Lakes. This is followed by sharply cooler temperatures for the weekend with a widespread freeze expected for Saturday and Sunday. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 721 PM EDT Mon Oct 12 2026 Radar shows showers and thunderstorms developing along a trough preceding a cold front that will move across the terminals Tuesday morning. Have bumped up the timing of the precipitation by a few hours. Otherwise, VFR conditions are expected through the period. Expect several hours of breezy conditions behind the cold front. && .MARINE... Issued at 256 PM EDT Mon Oct 12 2026 Based on the updated forecast of winds and waves, the Small Craft Advisory is extended into Tuesday afternoon and expanded south to South Haven. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 2 PM EDT Tuesday for LMZ845>849. && $$ DISCUSSION...Ostuno AVIATION...04 MARINE...Ostuno

NWS GRR Office Area Forecast Discussion