641 FXUS63 KGRR 021048 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 648 AM EDT Sat May 2 2026 .KEY MESSAGES... - Another Chance for Frost Tonight - Occasional Showers Through Next Week && .DISCUSSION... Issued at 220 AM EDT Sat May 2 2026 - Another Chance for Frost Tonight An area of clouds continues to move through western Michigan helping temperatures stay slightly warmer, but once they clear temperatures quickly drop. Expect morning temperatures to be in the upper 20s to low 30s before warming up into the low 50s today. Clouds build back in with the shortwave trough moving through this afternoon, but are expected to clear briefly overnight. Northwest winds could become breezy just prior to sunset with gusts to 30 mph. There will be a window for frost tonight after midnight. The best chance will be east of the 131 corridor as cloud cover is expected to move in early Sunday morning. Temperatures will quickly improve as the cloud cover moves in ahead of our next chance for rain. - Occasional Showers Through Next Week The shortwave trough moving through the area Sunday will bring isolated to scattered showers before dry conditions return by Sunday evening. As the low level jet moves through expect winds to pick up with peak gusts during the afternoon. Southwest winds gusting 25 to 35 mph are likely (60 percent or higher) with a 20 percent chance for gusts to 40 mph. Southwest flow will become more dominant into next week. Upper level divergence sets up Monday night with the approaching trough and positive vorticity advection. This trough will be slow moving keeping us in the southwest flow until it passes Thursday. This will keep rain chances over the area, especially along and south of I-69. Instability is low, but could still see a rumble of thunder Monday night. With the cloud cover and rainfall through the week, low temperatures will remain warmer than over this weekend, however chances for frost still remain for the second half of the week as rain and cloud cover clears, especially for areas north of M-20. && .AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 648 AM EDT Sat May 2 2026 VFR conditions are expected with afternoon SCT to BKN around 6000 feet. Northwesterly winds may pick up briefly between 22Z to 00Z with gusts around 25 knots. Winds then become southwesterly overnight with low level wind shear around 35 knots developing around 9Z. Could cover will increase early Sunday morning but showers should hold off until after 12Z. && .MARINE... Issued at 220 AM EDT Sat May 2 2026 Light northwest winds are expected today before becoming southwesterly tonight. Winds and waves build overnight into Sunday with Small Craft Advisory conditions likely by Sunday morning. A brief lull in Small Craft Advisory conditions is possible Sunday night into Monday, before southwest winds and waves pick back up. Lighter, northerly winds then return for Tuesday and continue into Thursday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...Freeze Warning until 9 AM EDT this morning for MIZ037>040- 043>046-050>052-056>059-064>067-071>074. MARINE...None. && $$ DISCUSSION...RAH AVIATION...RAH MARINE...RAH

NWS GRR Office Area Forecast Discussion