After temperatures "popped" into the mid 20s Saturday morning; cold air advection is on the move and will overspread Southeast Lower Michigan on gusty northwest winds throughout this Saturday afternoon and night. Look for readings to drop around zero and below overnight Saturday into Sunday morn.
Our fast moving clipper over Saskatchewan in Southwest Canada is on course to sail southeast across the snow-laden landscape into Northern Illinois and is projected to be near Chicago by the late morning hours of Sunday. Meanwhile; another plunge of Arctic air will organize over the Dakotas and dive into the Western Lakes system during the day, Sunday. Ahead of this system; another brief period of moderating air will help Sunday's temperatures climb into the 20 to 25 degree range Sunday. This entire system will bring another 1 - 3" of snow and blustery conditions over Southeast Lower Michigan Sunday and Sunday evening before the colder Arctic air, once again overspreads our region Sunday night into Monday. Wind chills will lower below zero again overnight and then Sunday night into Tuesday.
--------------------------------------------------------------------------------------------------------------------------------------------------------
1/22/2014
More and more information is unfolding about the onslaught of waves of fresh, bitter cold Arctic air and it's impacts across the eastern US into next week.
As mentioned in yesterday's blog, the first (in a series) of Arctic plunges is on track to engulf the region Saturday. This air mass will basically replace the bone-chilling cold already in place (and also seen this earlier this month) with a freshly stored batch of Arctic chill but the transition will also be accompanied by bitter cold dangerous wind chills.
As the first wave of Arctic air approaches Friday; strong and gusty southwest to west winds of 18 to 28 mph with gusts up to 35 to 40 mph will herald it's delivery by creating wind chills of -10 to -30; even as temperatures slowly moderate by rising through the teens and into the lower to mid 20s by early Saturday morning. Then by Saturday afternoon; look for the Arctic front to sweep through Southeast Lower Michigan and the temperature roller-coaster dives back down to around zero or below by Sunday morning. Widespread blustery snow, snow showers and blowing snow will accompany this interchanging of air masses with the first wave of snow accumulations though Saturday, mainly 1" to 3" of snow with locally higher amounts due to Lake Effect snow.
Latest indications are now a new Alberta Clipper Low pressure system will dive quickly southeast along the perimeter of the freshly laid Arctic air mass hovering across the southern Great Lakes on Sunday. Initially; all models are indicating the dynamics with this system and available moisture available from the south will contribute to bring more accumulating snow on Sunday. Of course this being so far out; the exact track and amounts of snow are questionable, therefore I'll update as this potential snow making system is bettered sampled with upper air soundings. The last two maps are estimates of the low's track and intensity. It's almost a certainty that this January will be the snowiest on record for Detroit and possibly Flint; especially if the Alberta Clipper on Sunday holds true to form.
After the Clipper blows through Sunday, the Arctic air will remain over the region in its wake well into the work week with yet another clipper possible later in the week. Bundle Up!
Making weather fun while we all learn,
Bill Deedler -SEMI_WeatherHistorian
