Current visible satellite across our area.

 

O’Hare

Today:  50/45, Partly Cloudy, turning cloudy by afternoon.  Rain moves in during the evening.

Tomorrow:  56/40, Rain ending by evening.

Wednesday:  59/38, Partly sunny to sunny.

Thursday:  53/33, Cloudy and slight chance of rain.

Friday:  45/30, Partly Cloudy to mostly cloudy.

Rockford

Today:  51/45, Partly Cloudy, turning cloudy by afternoon.  Rain moves in during the evening.

Tomorrow:  56/35, Rain ending by evening.

Wednesday:  59/35, Partly sunny to sunny.

Thursday:  51/30, Cloudy and slight chance of rain.

Friday:  48/28, Partly Cloudy to mostly cloudy.

Quad Cities

Today:  51/45, Partly Cloudy, turning cloudy by afternoon.  Rain moves in during the evening.

Tomorrow:  57/35, Rain ending by evening.

Wednesday:  60/35, Partly sunny to sunny.

Thursday:  53/30, Cloudy and slight chance of rain.

Friday:  47/28, Partly Cloudy to mostly cloudy.

 

Discussion:

 

As Matt highlighted in an article earlier today, the trend going forward, is for temperatures to remain on the colder side following a slightly warmer week.  For this week, there are a couple systems to track.  The first would begin to impact us this evening.  Due to warmer temperatures at both the surface, and aloft, precipitation will fall as rain.  Clouds will be on the increase throughout the day, and by afternoon, I would expect it to be mostly cloudy.  For any areas south of I-80 that received snow, I would expect the rain and warmth would melt off most of the snow you received this weekend.  Rain appears that it will clear most of northern IL by later afternoon on Tuesday.  Heaviest rain totals would favor an area southeast of a line from Chicago to Bloomington-Normal.  Guidance still has a decent range of 0.5-1.0” of rain for most of northern IL.  Given the relatively dry period we have had, I do not expect any hydro issues.

 

Even with the passing cold front Tuesday, and high-pressure building in behind over the Central Plains, temperatures should moderate nicely on Wednesday given the time of the year.  The sun’s angle of inclination is increasing for the northern hemisphere as every day passes, and IR absorption should be efficient with more abundant sunshine on Wednesday.

 

By Thursday, another system appears to develop near the Panhandle region of TX/OK.  Even though there is a decent chance that we remain dry with this system as it passes across southern IL, NNE winds of 10-20mph will certainly temper day-time highs, especially for areas near the lake.  One steering mechanism for the system and associated baroclinic zone, is high pressure again working its way in across the northern portions of the Central Plains.

 

On Friday, high-pressure will remain in control, and sunshine should dominate.  Though, temperatures will be held in check a little bit due to the more northerly flow, and subsidence.  By the overnight hours, we should begin to see some changes occurring in terms of surface winds in response to cyclogenesis near the front range of CO.  Warm air advection will begin to infiltrate northern IL by Saturday mid-morning to afternoon.  Despite this, with ample blocking and cold air to our north (as already covered), the weekend could trend towards cold, and maybe snowy.  More to come later on that.