351 FXUS63 KGRR 081047 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 647 AM EDT Fri May 8 2026 .KEY MESSAGES... - Northwest Flow Regime Continues && .DISCUSSION... Issued at 257 AM EDT Fri May 8 2026 - Northwest Flow Regime Continues Upper troughing across the Great Lakes will persist into next week. Temperatures will run cooler than normal with Frost/Freeze potential on Saturday, Sunday and Monday nights. Clipper type lows will occasionally bring showers in a northwest flow regime. A shortwave trough moves through tonight with scattered showers into Saturday morning. The pattern repeats for Tuesday into Tuesday night. The Tuesday low should have deeper moisture to work with, but is moving fast enough to limit the chances of excessive rainfall. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 647 AM EDT Fri May 8 2026 VFR conditions today and much of tonight with southwest winds AOB 10 knots. MVFR conditions move in late tonight, and could see ceilings approaching IFR by 12Z Saturday across southern Lower Michigan. && .MARINE... Issued at 257 AM EDT Fri May 8 2026 Held off on a SCA for tonight as conditions will be marginal but it is possible that south/southwest winds will gust to 25 knots this evening north of Whitehall where waves could also top 4 feet, especially around Big and Little Sable Points.Conditions improve Saturday night and Sunday as pressure gradient relaxes. && .FIRE WEATHER... Issued at 257 AM EDT Fri May 8 2026 Lowered NBM dew points for today given soundings showing mixing heights rising to 7500 feet. This gives Min RH around 25 percent this afternoon. Deep mixing will yield winds of 20 knots at the surface as well, so we will have to monitor for RFW criteria being reached this afternoon. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...Frost Advisory until 9 AM EDT this morning for MIZ037-038- 043>046. Freeze Warning until 9 AM EDT this morning for MIZ039-040. MARINE...None. && $$ DISCUSSION...Ostuno AVIATION...Ostuno MARINE...Ostuno FIRE WEATHER...Ostuno

NWS GRR Office Area Forecast Discussion