Many school districts have closed Thursday, Jan. 23, as snowfall continues - particularly along the lakeshore - in a weeklong winter storm.

“In cold temperatures like this, when the firefighters stop, and they have sweat underneath. Once they lose the protection of that vapor barrier, they never get it back,” a Fire Lieutenant with The Kalamazoo Department of Public Safety said.

While temperatures are rising and we're on our way out of the sub-zero temperatures we saw earlier this week, the snow still won't quit.

Impressive amounts of snow have fallen since Sunday leaving portions of West Michigan under over a foot of snowfall.

Lake-effect snow causes multiple crashes and road closures in West Michigan, including a jackknifed semi on I-196.

Heavy snow in spots, with blowing and drifting snow and dangerous travel possible. Get the latest details from the FOX 17 Weather team.

EST the National Weather Service issued an updated winter storm warning in effect until Thursday at 10 a.m. EST for Mason, Lake, Oceana, Newaygo, Muskegon and Ottawa counties.

Snow will continue into the overnight hours before winds bring in more lake-effect snow Thursday morning on a northwesterly wind.

The coldest air in six years blasts into Michigan to start the week, with highs in the single digits, wind chills ten to twenty-five below zero, heavy lake effect snow

Those who can in Southwest Michigan are prepping for forecast freezing temperatures at the grocery store. Some groups are working with those with nowhere to go to keep them safe from the cold. Others are stocking up with supplies to shield their homes.

“In cold temperatures like this, when the firefighters stop and they have sweat underneath, once they lose the protection of that vapor barrier --they never get it back,” Fire Lieutenant Jason Hendrick with the Kalamazoo Department of Public Safety said.

Trinity Health Muskegon has successfully implanted a new FDA-approved pacemaker that is offering hope for those with abnormal heart rhythms.