Short and long range video forecast: M.
EVENING – TONIGHT: Light to moderate snow continues to move to the east and southeast across Illinois this afternoon. Temperatures across most of zones 6 and 7 have fallen below freezing with the exception of southern portions of zone 6.
Through the evening an upper level vorticity max will move southeast across the region. This will support continuing snow showers across the zones this evening into the overnight. With that upper level moving through I wouldn’t be shocked to see some heavier bursts of snow around 6-9 PM as the upper level vort max moves through.
Overnight scattered snow showers will continue southeast across the forecast zones as they spin around the backside of the area of low pressure.
The latest HRRR model through 5 AM Tuesday morning shows most places getting .1-.4” of new snow this evening. However, there are some localized places that get an additional .5-1” of snow where the heavier bands move through associated with that upper level disturbance.
Winds will also start to increase late this evening into the overnight. Wind gusts of 20-30 mph will be possible across the forecast area.
Lows overnight will be in the upper teens to mid 20’s.
TUESDAY: Snow showers look to continue through mid-day on Tuesday.
However, by early to mid-afternoon most of the snow looks to come to an end across Illinois with only some isolated light snow showers and flurries remaining.
Highs on Tuesday will be in the low 20’s to around 30 south.
With winds gusting to 20-30 mph Tuesday, wind chills will only be in the single digits and teens.
Tuesday night a bit of a ridge of high pressure will build into the region. Lows overnight will be in the teens, but wind chills will be just below zero to the single digits across the region.
WEDNESDAY: While the daytime hours on Wednesday will remain dry across zones 6/7 we will be watching another clipper coming out of the northwest that will impact portions of the region late in the evening.
The latest NAM model places snow into western Illinois around 9-10 PM Wednesday night.
This looks to be a pretty quick-moving system as the snow looks to be in and out of the zones by mid-morning Thursday.
While we aren’t anticipating any major accumulations with this system, 1 to perhaps 2” of snow will be possible in locations. This is something we will have to fine-tune over the next 24-48 hours.
THURSDAY: An area of high pressure will move into the forecast area through the day on Thursday. This will give us a quiet and cold day.
Highs will be in the mid 20’s north to low 30’s south.
FRIDAY: Another clipper system looks to impact the forecast zones by late morning into the early afternoon on Friday. This clipper looks to have a bit better of a moisture supply with it. That combined with some cold temperatures could make for some decent accumulations Friday afternoon into late Friday night.
WEEKEND: A strong area of high pressure looks to move into the region late Friday into Saturday and will be in control to start the weekend. Temperatures on Saturday look to be very cold as the arctic high remains in place.
Our forecast will call for highs in the teens and lows just below zero to single digits Saturday night. However, some of the data would suggest even colder temperatures. Those will be highly dependent on snowpack location, so it’s something we will fine tune over the next several days.
Sunday models continue to show the potential for a winter storm across some of the forecast zones by afternoon and overnight Sunday. Obviously we are still pretty far out to give specifics, but both model trends and the overall pattern would support the solution of a winter storm.