050 FXUS63 KGRR 260515 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 115 AM EDT Wed Aug 26 2026 .KEY MESSAGES... - Chance for thunderstorms Wednesday, maybe some severe weather && .DISCUSSION... Issued at 255 PM EDT Tue Aug 25 2026 - Chance for thunderstorms Wednesday, maybe some severe weather Cold front on track for Wednesday with some light showers still possible early in the morning. Main time frame for any severe weather still looks to be noonish and after with all weather clearing the area by 8pm. Morning showers should be pretty scattered and are likely to inhibit afternoon storm potential for a good deal of the area - especially north of I-96 and west of US-131. Some warm/moist air will build in ahead of the front into southern lower Michigan...where best potential for destabilization will occur mid-afternoon into the early evening. This leaves the best potential for severe weather near I-94 and east of US-131...probably closer to US-127 and east. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 115 AM EDT Wed Aug 26 2026 A line of showers is likely to arrive at MKG around 12z this morning, with embedded thunder possible. Some of this line may survive as it presses east toward GRR and AZO after 14z. HREF guidance suggests the 18z-21z period is where TSRA is most likely to develop between AZO and LAN especially, then move east into late evening. An isolated shower or storm may also redevelop across central Lower MI and head SE after 23z, though it is difficult to pinpoint where that activity may be. Any TSRA activity could produce wind gusts in the 30-40 kt range. Once radar trends better emerge, amendments may be needed to include some of these higher gusts. && .MARINE... Issued at 255 PM EDT Tue Aug 25 2026 Winds and waves to increase overnight tonight making for a hazardous boating and swimming day Wednesday. 3 to 7 foot waves will be common...especially in the northern zones into late Wednesday evening. Waves are likely to be a little less toward St joseph but borderline enough in the northern part of Van Buren County to not leave that zone out of the headlines at this time. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...Beach Hazards Statement through this evening for MIZ037-043-050- 056-064-071. MARINE...Small Craft Advisory until midnight EDT tonight for LMZ844>849. && $$ DISCUSSION...Maczko AVIATION...Hoving MARINE...Maczko

NWS GRR Office Area Forecast Discussion