811 FXUS63 KGRR 261746 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 146 PM EDT Tue May 26 2026 .KEY MESSAGES... - Isolated Showers and Storms Possible Wednesday - Dry With Highs In The 70s The Rest Of The Week && .DISCUSSION... Issued at 145 PM EDT Tue May 26 2026 - Isolated Showers and Storms Possible Wednesday High pressure is keeping conditions dry with highs in the 80s today (and Wednesday) given 850mb temps in the mid teens. A backdoor cold front arrives overnight, but the surface front arrives with little impact other than a direction shift of light winds. The front aloft, and by extension better forcing, arrive later Wednesday into Wednesday night with the arrival of a mid-level wave. Low-level moisture quality is poor so would expect no more than scattered showers. Given several hundred joules of MLCAPE, isolated thunderstorms are also possible. - Dry With Highs In The 70s The Rest Of The Week Once the backdoor cold front passes through, West Michigan will sit on the periphery of the upper ridge and an upper low that drifts by to the east. There are questions as to whether the influence of the upper-level cold pool affects us and by extension our temperatures. Regardless, a lack of moisture will lead to ample sunshine late this week into early next week. The slightly cooler post-frontal airmass, even with the questions as to how much cooler it will be, will support highs in the 70s. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 137 PM EDT Tue May 26 2026 VFR expected into Wednesday morning with just higher-altitude clouds. Light S or SW winds this afternoon becoming variable tonight. && .MARINE... Issued at 145 PM EDT Tue May 26 2026 We continue to watch for the potential for hazardous winds and waves later Wednesday into Thursday as an advancing high setup leads to a period of north winds of 15-25 knots. Short range model guidance suggests however that the flow may have a slight offshore component which would keep waves from reaching advisory levels, and gusts will be marginal if we can reach thresholds according to BUFKIT overviews. No headlines will be issued at this time. Surface ridging then sets in for the weekend keeping winds and waves low. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...Thomas AVIATION...CAS MARINE...Thomas

NWS GRR Office Area Forecast Discussion