Michigan Snowstorm Saturday: Warnings Expand; Detroit, Ann Arbor Shift to Snow
— An on-schedule snowstorm moving across Michigan prompted updated watches and warnings early Saturday after forecasts were adjusted. Winter Storm Warnings were expanded along the Sunrise Side shoreline from Saginaw Bay north to Alpena and Rogers City, and part of Mackinac County in the Upper Peninsula was added. The Thumb and eastern Detroit metro are under a Winter Weather Advisory, while southeastern metro areas including Ann Arbor and Detroit were shifted toward mostly snow. Most of Lower Michigan is expected to pick up several inches, with local lake-effect bands producing higher totals in the southwest.
Key Takeaways
- Updated: forecast update posted Nov. 29, 2025; latest bulletin timestamp 9:24 a.m. (update) and original 9:05 a.m. (publish).
- Warnings added: Winter Storm Warnings now include Saginaw Bay north to Alpena and Rogers City, plus part of Mackinac County (U.P.).
- Advisories: The Thumb and eastern Detroit area placed under Winter Weather Advisories, expecting 1–2 inches less than surrounding regions.
- Precipitation type: Ann Arbor and much of Detroit shifted to mostly snow; a brief period of rain around sunrise possible in Monroe and downtown Detroit.
- Snow totals: Most of Michigan 4–7 inches; southwest quarter (lake-effect) 6–11 inches; western half pockets 6–10 inches; Traverse City/Cadillac 5–8 inches; Detroit 3–5 inches.
- Warning end times: central Michigan warnings expire ~10 a.m. Sunday; eastern Lower by ~1 p.m. Sunday; southwest corner extended to ~7 p.m. Sunday due to afternoon lake-effect.
- Timing: light snow begins early Saturday, spreads through the day; by 5 p.m. most of Lower Michigan will see accumulating snow; by 8 p.m. snow covers nearly the entire state including most of the U.P.
Background
The storm is a compact low-pressure system tracking across the Great Lakes region on Nov. 29, 2025. Forecasters had anticipated development for several days, and the system followed the expected timing closely overnight. Because of the low’s track and cold air in place, forecasters indicated a widespread snow threat across Lower Michigan with enhanced totals where lake-effect processes add to synoptic snowfall.
Regional stakeholders include the National Weather Service/NOAA, Michigan state transportation agencies, and local counties that issue travel advisories and warnings. The configuration of the low—crossing near Ann Arbor and then toward the Thumb—creates a common pattern in which areas just southeast of the track can experience mixed precipitation. That factor produced an earlier forecast for sleet/freezing rain in far southeast communities before the update favored mostly snow.
Main Event
Sustained light snow is expected to begin across parts of the state Saturday morning, with the first couple of hours remaining relatively light before intensifying. Southwest Lower Michigan should see snow develop early in the day, while eastern and northern Lower Michigan may not see appreciable snow until late morning to noon.
By mid- to late afternoon (around 5 p.m.), snow will be falling across most of Lower Michigan, making road surfaces slick—especially through eastern counties and north to Cadillac and Traverse City. The far northeast corner of the state may remain drier for a few additional hours.
Evening (around 8 p.m.) radar guidance indicates snow overspreading nearly the entire state, including much of the Upper Peninsula. Southern Michigan is forecast to receive the heaviest accumulations through the night, with lake-enhanced bands producing the highest local totals in the southwest quarter of Lower Michigan.
In the far southeast—Monroe, downtown Detroit and adjacent areas—forecasters note a small window near sunrise when precipitation could be briefly rain rather than snow. That window depends on the exact track and speed of the low pressure center near Ann Arbor.
Analysis & Implications
Operationally, expanding Winter Storm Warnings northward along the Sunrise Side reflects confidence in coastal snowfall and wind-driven accumulations where onshore flow interacts with the bay. That expansion raises the expected impacts for communities from Saginaw Bay up to Rogers City, including travel disruption and heightened hazard for shoreline roads.
The southwest lake-effect corridor—south of Lake Michigan—remains the greatest area of variance, with local enhancements driving totals into the 6–11 inch range. Those localized heavier bursts can produce rapid reductions in visibility and sudden changes in road conditions, complicating afternoon and evening travel.
For southeastern metro areas, the change from a mixed-precipitation forecast to predominantly snow reduces immediate concerns about widespread freezing rain and prolonged black ice formation. However, a brief rain interval near sunrise would momentarily reduce accumulations then allow rapid re-freezing as colder snow returns, so travel cautions still apply.
Economically, the snow may affect late-November retail returns and holiday travel plans; transportation agencies should prioritize evening clearance on major corridors before the lake-effect intensifies. Public safety messaging should emphasize delaying nonessential travel, particularly after mid-afternoon Sunday in areas expecting extended lake-effect into the evening.
Comparison & Data
| Region | Forecast Snowfall |
|---|---|
| Most of Lower Michigan | 4–7 inches |
| Southwest quarter (lake-effect) | 6–11 inches |
| Western half (Grand Rapids, Kalamazoo) | 6–10 inches |
| Traverse City / Cadillac | 5–8 inches |
| Detroit metro | 3–5 inches |
The table above consolidates forecast ranges communicated by regional forecast offices and guidance. These ranges reflect both synoptic snowfall from the main low and localized lake-effect enhancements. Local terrain and shore-parallel bands can push totals above the upper end of the range in isolated spots.
Reactions & Quotes
Forecasters noted the storm was tracking as expected and that expanded warnings reflect coastal exposure and confidence in accumulations.
National Weather Service / NOAA (forecast office statement)
Local transportation officials advised motorists to expect slick roads by late afternoon and to postpone nonessential travel after 3 p.m. Sunday where warnings remain in effect.
Michigan Department of Transportation (official advisory)
Residents in the southwest lake-effect corridor were warned about localized heavy bursts that could quickly reduce visibility and produce rapid snowfall rates.
Regional meteorologist briefing (MLive coverage)
Unconfirmed
- The precise extent and duration of any brief rain window near sunrise in Monroe and downtown Detroit remain subject to small track shifts.
- Localized extremes above the high end of forecast ranges (isolated 12+ inch totals) are possible in persistent lake-effect bands but are not broadly confirmed.
Bottom Line
This Nov. 29, 2025 system is bringing widespread snow to Michigan on schedule, with Winter Storm Warnings extended along portions of the Sunrise Side and into the U.P. Most residents can expect a general 4–7 inch snowfall, with higher pockets—especially in the southwest—reaching up to near a foot in places.
Travel impacts will become most significant in the second half of Saturday afternoon into evening; officials recommend avoiding nonessential travel after mid-afternoon Sunday in warned areas. Monitor local forecasts for any late changes, particularly in the far southeast where a brief rain window could briefly alter surface conditions.