UPDATED POST: Friday, December 16, 2016, 4:37 p.m.
Light freezing rain and light snow are already being reported across Iowa and Illinois Friday afternoon. This will make roadways slippery tonight.
After a break in the wintry mix later tonight into Saturday morning, a strong cold front blasts through the area early Saturday afternoon and temperatures crash into the single digits shortly after dark and well below zero into Sunday morning.
This front will also bring several hours of light to moderate snow and this is when we’ll see our main accumulation. Unfortunately, it’ll also be blown around by strong winds causing driving nightmares.
Snowfall totals below are still on target.
I’ve also been talking about the dangerous wind chills that will rush in as the storm departs.
Here are the counties that will be under a “Wind Chill Advisory” and a “Wind Chill Warning” from 9 p.m. Saturday through noon Sunday.
It’ll feel like -20° to -40° during this time!
Be safe out there this weekend!
ORIGINAL POST: Friday, December 16, 2016, 5:49 a.m.
The third weekend winter storm in as many weeks gets underway Friday and will last through much of Saturday.
Bitterly cold temperatures and dangerous wind chills follow Saturday Night through Monday morning.
A “Winter Weather Advisory” goes into effect at noon Friday across our northern hometowns and for the rest of the Mississippi and Illinois Valleys Friday evening. This advisory runs through midnight Saturday.
After a quiet Friday morning, light snow will develop in our western and southwestern hometowns later this morning. The snow spreads across all of the area Friday afternoon into Friday night and early Saturday.
It’s looking more likely that warmer air will be pulled into this system along and south of Interstate 80. This will cause the snow to mix with and change over to sleet and then freezing rain.
Across our northern hometowns, it’ll stay in the form of snow.
We get a break from the snow and wintry mix Saturday morning, but snow will re-develop again by Saturday afternoon and last for about six hours.
This is when we’ll see most of our snow accumulation. The snow ends by midnight Saturday night.
The heaviest snow will be from Maquoketa, Iowa, to Mount Carroll, Illinois, northward. Four inches or more will accumulate there.
Along Interstate 80 and in the Quad Cities, I still think 2-4″ of new snow will fall.
South of the Quad Cities from around Burlington, Iowa, to Monmouth and Galesburg, Illinois, an inch or two will fall, but they’ll also see some light ice accumulations.
BITTER COLD FOLLOWS
On top of the snow (and ice) accumulations, bitterly cold temperatures and dangerous wind chills return.
When you wake up Sunday and Monday mornings, lows will be around -10° in the Quad Cities and even colder to the north.
Once you factor in the wind, it’s going to feel like -20° to -40°. It only takes minutes for frostbite to set in.
Highs Sunday will stay below zero to the north and near zero in the Quad Cities. Southern hometown will rise to the single digits.
By the middle of next week, temperatures will rebound back into the 30s.