490 FXUS63 KGRR 281827 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 227 PM EDT Tue Apr 28 2026 .KEY MESSAGES... - Cooler With A Couple Chances for Showers, Frost Likely && .DISCUSSION... Issued at 227 PM EDT Tue Apr 28 2026 - Cooler With A Couple Chances for Showers, Frost Likely This week an upper level trough will sit over the region bringing cooler temperatures along with a couple chances for showers. A shortwave trough will move through late tonight into Wednesday morning bringing scattered showers. Best chances (40 to 50 percent) will be south of a Holland to Mount Pleasant line. On the backside of the trough showers could linger into the afternoon with some surface based instability for more brief isolated showers. Depths do not look high enough to pose any risk for thunderstorms. Another shortwave trough brings slight chances (20 percent) for showers Thursday. Highs through the week will be in the 40s to 50s with lows in the 20s to 30s with the coldest temperatures Friday night into Saturday morning. The colder temperatures will be a concern for sensitive vegetation. At this time cloud cover is expected to be mostly clear each night along with light winds due to the inversion. Looking at 925mb temperatures and ensemble probabilities the probability of lows less that 36 degrees is high starting Wednesday night and going into the weekend. Ensembles are in agreement as well for probabilities of less than 32 increasing into the weekend. Lakeshore areas may be several degrees warming than inland. Frost Advisory and Freeze Warning headlines will likely be needed. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 125 PM EDT Tue Apr 28 2026 Visible loop sows some clearing occuring from the west; we`ll see cigs lift and scatter this afternoon. However, the clearing will be short lived as another low will lift northeast toward the Great Lakes overnight. Clouds will move in after midnight and lower to MVFR around 12z. Models indicate most if not all of the precipitation will remain south of the terminals. && .MARINE... Issued at 227 PM EDT Tue Apr 28 2026 Winds and waves will drop below Small Craft Advisory conditions this afternoon into this evening. Lighter winds and lower wave heights are expected through the remainder of the week. Winds shift to the north tonight into Wednesday and remain northerly into Saturday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 6 PM EDT this evening for LMZ844>849. && $$ DISCUSSION...RAH AVIATION...04 MARINE...RAH

NWS GRR Office Area Forecast Discussion