A dangerous system is moving through Detroit this morning. We have a set up for a wintry mix
where freezing rain is the dominant precipitation type. This set up is called overrunning and we'll have a textbook example of it today.
The forecast sounding above explains the set up. Essentially, you have colder air near the surface with a layer of warmer air on top of it.
As the rain falls, it won't have an opportunity to freeze completely, so it ends up freezing on contact, creating freezing rain.
A Winter Weather Advisory is in effect for all of southeast Michigan until 1 PM, which means you can see ice measurements from a .10 to .25 inch. This is dangerous to motorists
and is bad for infrastructure, since it has the ability to bring down trees and power lines with scattered outages possible.
Here's a sample of what the models are putting out. The average is anywhere from .10" - .35" (higher amounts are also accounting for sleet accumulations) of ice. This will cause power outages and dangerous travel for much of the day. Stay with 7 Action News for the latest on the forecast along with current school closings.