185 FXUS63 KGRR 062320 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 720 PM EDT Mon Apr 6 2026 .KEY MESSAGES... - Snow showers this evening - Fair Tuesday then rain chances return && .DISCUSSION... Issued at 251 PM EDT Mon Apr 6 2026 - Snow showers this evening Shortwave trough and sfc cold front moving through this afternoon and evening with enough surace-based instability to bring diurnally enhanced rain,graupel, snow showers through early evening. Then the really cold air moves in with 850mb temps dropping to -15C tonight as the thermal trough swings through. This will be cold enough to provide some lake-enhancement with snow showers and flurries persisting overnight before surface ridging builds in and subsidence and drying bring clearing by Tuesday morning. - Fair Tuesday then rain chances return Fair and cold weather into Wednesday morning, then the surface high moves east and we go back to return flow of warmer but increasingly moister air. A baroclinic zone and weak front is across Lower Michigan by early Thursday with rain diminishing by late Thursday as the front dags south and washes out. Unsettled weather expected into early next week with potential for significant rain and convection as Plains cyclogenesis moves northeast across the Great Lakes, with the details uncertain on specific timing and tracks of the surface lows. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 718 PM EDT Mon Apr 6 2026 Radar shows light snow showers moving south across the terminals. A shot of colder is is poised to flow over the lake tonight and we`ll see lake effect snow showers continue. However, by morning, high pressure will be moving overhead and boundary layer winds will move to a northerly or northeasterly direction, putting an end to the precipitation. VFR conditions are expected through the period. However, for a few hours this evening, MKG/GRR may see cigs around 2500 ft. && .MARINE... Issued at 251 PM EDT Mon Apr 6 2026 No changes to the SCA. Some gales of 35 knots are possible this evening north of Whitehall, Winds and waves will quickly decrease on Tuesday morning as high pressure builds in then pick up again from the south or southwest on Wednesday as the high moves east, && .HYDROLOGY... Issued at 251 PM EDT Mon Apr 6 2026 No significant rain is expected until Wednesday night and Thursday when one quarter to half an inch is forecast across the Muskegon Basin with lesser amounts to the south across the Grand and Kalamazoo river basins. Until then, crests will continue moving downstream across the rivers. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 8 AM EDT Tuesday for LMZ844>849. && $$ DISCUSSION...Ostuno AVIATION...04 MARINE...Ostuno HYDROLOGY...Ostuno

NWS GRR Office Area Forecast Discussion


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