The National Weather Service has issued a winter weather advisory from 1 p.m. Wednesday to 7 a.m. Thursday, and a winter storm warning, which is even more serious, in the four-county area where snowfall is expected to be heaviest.

A couple of rounds of snow moving through Southeast Michigan this weekend is creating slick road conditions. According to Michigan State Police, there have been at least 44 crashes across the region since midnight Saturday. As of 1 p.m., authorities say most roadways only have one lane open since other lanes are covered with snow.

Heavy snow will begin falling Wednesday evening and continue into Thursday morning. Here's how much to expect.