GFS precipitation depiction of our rain chances over the next few days.

Oh, the weather outside is weather! 

After a chilly start to the morning with lows dipping down to around 30 overnight tonight, we should see temperatures rebound to around 50. The first half of the day looks to be sunny but as we move towards the latter half, mid-level clouds should begin spilling in ahead of a developing warm front. There will be a slight chance for some shower activity overnight Thursday into early Friday but our best chances for precipitation will arrive Friday evening when a strong southwesterly low-level jet will bring abundant moisture. The surface low should track through the area and gradually weaken as it moves off to the east on Saturday and any wintry precipitation should stay north and east of southern IL. Until the trough moves out of the area Saturday evening, precipitation chances will exist. Right now it looks like 1/2″ – 3/4″ of precipitation looks like a conservative initial forecast but we might see some localized higher amounts exceeding an inch where convective banding sets up. Similar to last weekend, Sunday will dry out ahead of another approaching system that will provide periods of rain Monday through Tuesday evening thanks to an active southwesterly flow providing a moisture return ahead of a slow southeastward progressing cold front. 

GFS forecast precipitation totals through Saturday night.
Canadian forecast precipitation totals through Saturday night.

Tonight – Mostly clear with lows falling to near 30. 

Thursday – Mostly sunny with highs around 50. Clouds filling in late in the afternoon into the evening. Overnight lows in the upper 30s.

Friday – Mostly cloudy with highs in the low-mid 50s. Overnight lows falling into the mid-40s.

Saturday – Highs in the mid-50s to low 60s. Overnight lows in the mid-30s. 

Sunday – Highs in the low-mid 50s. Overnight lows falling to around 40.