175 FXUS63 KGRR 011033 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 633 AM EDT Thu Oct 1 2026 .KEY MESSAGES... - Rain ending Friday - Cooler with frost/freeze possible into next week && .DISCUSSION... Issued at 304 AM EDT Thu Oct 1 2026 - Rain ending Friday National radar shows a large band of rainfall from Michigan southwest to the southern Plains, moving northeast. The rain is ahead of a cold front that will move across the cwa Friday. Deep south flow is in place east of the front and is drawing moisture northward from the Gulf as well as from the eastern Pacific, where the remnants of the tropical system have been entrained into the upper flow. This added moisture has resulted in flooding in the Mid MS Valley. However, flooding isn`t expected within the cwa. Light to occasionally moderate rainfall will continue into the overnight. Additional rainfall accumulations of a half to around an inch are possible. Once low pressure over Kansas moves northeast along the frontal boundary into Michigan, the cold front will move southeast across Lower MI beginning tonight and continuing into Friday. As high pressure builds in behind it, we`ll see decreasing cloudiness throughout the day. Dry weather will then continue through the weekend and much of next week. - Cooler with frost/freeze possible into next week Clear skies and light winds will set up radiational cooling conditions. Temperatures in the upper 20s are possible along US-10 with lower to mid 30s as far south as M-20. Thus, frost/freeze headlines are likely tomorrow night. After another cold frontal passage Sunday, additional frost/freeze headlines are possible Sunday night and Monday night. Monday night will be the coldest of the season so far. Lows Monday night will be in the mid to upper 20s north of M-20 and in the lower to mid 30s south through the rest of the cwa. Highs during this period will be in the lower to mid 60s. && .AVIATION /12Z TAFS THROUGH 12Z FRIDAY/... Issued at 631 AM EDT Thu Oct 1 2026 Rain continues across the region as a cold front slowly approaches from the west. Most terminals are VFR except for MKG which has a 400ft broken deck. As the cold front moves south across the Lower Peninsula later today, IFR ceilings will move south across the rest of the terminals. Precipitation will come to an end late tonight and ceilings will rise to VFR after 06z. && .MARINE... Issued at 304 AM EDT Thu Oct 1 2026 The marine headlines have been canceled due to wind and waves falling below advisory/statement criteria. We`ll have a 24 hour period of low wind/waves before north winds develop behind a cold front early Friday morning. At that time, we`ll likely need another small craft advisory as north winds will push waves to 4 to 6 feet. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...04 AVIATION...04 MARINE...04

NWS GRR Office Area Forecast Discussion