846 FXUS63 KGRR 191043 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 643 AM EDT Fri Jun 19 2026 .KEY MESSAGES... - Cooler than normal with occasional rain && .DISCUSSION... Issued at 235 AM EDT Fri Jun 19 2026 The Great Lakes will continue to be in a fast quasi-zonal flow regime on the southern edge of persistent upper troughing across eastern Canada into next week. This will keep temperatures below normal with fast-moving shortwave troughs bringing the chance for rain late tonight into early Saturday, Sunday night, and again on Wednesday. The best chance for rain will be across southern Lower Michigan on Sunday night as low pressure tracks across northern Indiana and Ohio. An area of mid-level frontogenetic forcing should bring steady rain across the I-94 corridor with QPF of one-half to one inch by the time the rain ends on Monday. A weaker low follows for Wednesday in northwest flow and precip amounts will probably be less than a quarter inch. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 643 AM EDT Fri Jun 19 2026 VFR conditions will continue through Saturday morning. Northwest winds could gust to over 20 knots at times this afternoon, then diminish this evening. && .MARINE... Issued at 643 AM EDT Fri Jun 19 2026 Fairly tranquil conditions into Sunday then winds and waves will increase Sunday night as low pressure passes just south of Lake Michigan. A SCA may be needed for Monday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...Ostuno AVIATION...Ostuno MARINE...Ostuno

NWS GRR Office Area Forecast Discussion


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