FXUS63 KGRR 080450 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 1150 PM EST Sun Dec 7 2025 .KEY MESSAGES... - Chances for precipitation every night this week - Continued colder than normal && .DISCUSSION... Issued at 316 PM EST Sun Dec 7 2025 - Chances for precipitation every night this week Latest vis loop shows come clearing moving south across the cwa with more closed cell cu over northern lower moving toward the cwa. High pressure was noted over Minnesota and that high will move across the cwa later tonight and Monday. Another in a long line of clipper will move from southwest Canada across the northern Plains and Great Lakes Monday night producing light snow. There's going to be some southwest lake enhancement as the wave moves through that will favor the northern cwa. It's possible 2-4 inches of snow may fall northwest of a Muskegon to Baldwin line and 1-3 inches east of there but north of I-96. That clipper will quickly be followed by another clipper Tuesday night. This clipper is progd to be stronger both at the surface and aloft , but also pull some warmer air northward. The models have been advertising the warmer air for a few days which increases confidence in less accumulation south of I-96. The track of the surface low will be key to which areas see the most snow. Models indicate the low will track across central Wisconsin and then north of M-46. This would place the northern two rows of counties in the coldest air which may result in 3-5 inches of snow Tuesday night. It's possible an inch or less of snow may fall south of I-96 before mixing with then changing to rain. Colder air will be pulled south across the cwa as the low moves by, most likely changing any lingering precipitation to snow. The core of the upper trough comes through Wednesday night and some light lake effect snow is possible with northwest boundary layer winds and h8 temperatures around -12c. Moisture isn't impressive but it's enough to produce some light snow. Another clipper will move across the cwa Thursday night in northwest flow aloft producing another inch or so of light snow. Finally, a strong cold front accompanied by a potent short wave moves through Friday night. This will also produce some snow, but it's a bit early to determine accumulations. - Continued colder than normal Southwest Lower will remain beneath an upper trough and northwest flow aloft through the week, which means we'll see colder than normal temperatures. Wednesday will be the warmest day as the low moves across the central cwa and we get a south flow ahead of it. Temperatures next weekend look very cold with highs in the lower 20s. && .AVIATION /00Z TAFS THROUGH 00Z TUESDAY/... Issued at 1150 PM EST Sun Dec 7 2025 Winds have slackened and light and variable to calm winds reside across lower Michigan. Skies have gone clear for the most part with temps dropping into the low teens to single digits. Those conditions will increase the chance for MVFR fog early Monday morning. Otherwise, VFR will dominate the pattern through the day with another round of snow showers will move in from the west after 03Z Tuesday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...04 AVIATION...Ceru