A snowstorm is definitely in the cards for the southern third of Lower Michigan. There has been just a slight tweaking from yesterday's forecast.

The axis of heaviest snow will still stretch from east to west centered on Interstate 80 in northern Illinois, Indiana and Ohio. But the heaviest snow band has also shifted 20 miles north and now covers the southern border counties in Michigan.

Here's the timeline. Light snow will start in just the southwest corner of Lower Michigan around 1 a.m. Sunday. By 4 a.m. Sunday the light snow should be falling at Jackson, Ann Arbor and south Detroit. At 7 a.m. Sunday light snow will be going at Muskegon, Grand Rapids, Lansing and Flint. It will take until 10 a.m. Sunday for Saginaw, Bay City, and Midland to see light snow.

The heaviest snow will fall between 1 p.m. and 11 p.m. Sunday. The heaviest snow, which I would call "moderate" snow, will fall from I-94 southward. North of I-94 I think most Michiganders would call it steady light snow.

The snow will hang on as moderate snow in southeast Michigan until 4 a.m. Monday morning.

Moderate snow brings one-half mile visibility and one-half inch per hour snow rates.

The snow will be over in the western half of Lower Michigan by 4 a.m. and 7 a.m. In southeast Michigan.

So how much is expected? Far southern Lower, including Jackson should easily get 6"-8" of snow. Kalamazoo, Ann Arbor and Detroit can expect 5"-7" total. Lansing, Grand Rapids and Flint should be able to get 3"-5". Saginaw and Muskegon can broom off 1"-3" of snow, with Bay City and Midland getting under 2".

These are the low end forecasts from the various models, so these amounts should be doable.

One thing to note is this will be a very cold, dry, fluffy snow. Winds up to 25 mph will produce a lot of blowing and drifting. In fact, that may be the worst part of the storm.

I'll check in often today to answer questions. Watch for an update later today.