156 FXUS63 KGRR 212250 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 650 PM EDT Mon Sep 21 2026 .KEY MESSAGES... - Predominantly Dry Weather This Week - Near Normal Temperatures && .DISCUSSION... Issued at 306 PM EDT Mon Sep 21 2026 - Predominantly Dry Weather This Week We are expecting mainly dry weather the rest of the work week and into the weekend. Most ensemble members are showing dry weather through the forecast period which leads to a high confidence forecast. The one item we are keeping an eye on though is the upper low to our west that drifts through the southern Great Lakes region Tuesday into Wednesday. The upper low is losing definition with time though as it traverses our area given it is moving through the mean ridge position. Moisture depth is not significant. We will continue with the dry forecast and watch the approach of the low. - Near Normal Temperatures Near to below normal temperatures are still expected through the period. Highs most days will be in the 60s which will be very close to normals across the area. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 650 PM EDT Mon Sep 21 2026 MVFR ceilings at or below 3,000 feet continue at AZO, BTL, and JXN, while few to broken clouds above 3,000 feet persist near MKG, GRR, and LAN. There has been a slow trend with the clouds thinning and scattering, but occasional ceilings may persist into the night with cool northeasterly winds. && .MARINE... Issued at 306 PM EDT Mon Sep 21 2026 A sprawling area of high pressure situated across the Great Lakes region will remain in place right through the work week. This will result in east and northeast winds for Southwest Lower Michigan through Friday. Given the off shore component of the wind we are expecting limited wave action near shore (0-1 foot). Out towards the 5 mile off shore mark we should be looking at larger waves (1-3 feet). && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...Duke AVIATION...CAS MARINE...Duke

NWS GRR Office Area Forecast Discussion