Southern IL Forecast

Current radar (3:45p.m.) from Paducah showing widely scattered light rain showers/drizzle across southern IL.

Going forecast for today still looks pretty solid with current temperatures in the upper 40s across most locations. Warm front has developed south of IL in response to lee cyclogenesis across the central and southern Plains and I’m still expecting the warm front to lift north this evening. How far the front lifts is in question, however. As a result, the location of precipitation will need to be monitored but anywhere in the vicinity of the warm front will have enough lift and moisture to produce some rain showers and a stray thunderstorm. Precipitation totals look pretty light, so I don’t expect any flooding issues but rain chances will exist until the warm front sags south overnight into Saturday morning. 

The majority of Saturday looks like it should be dry. Will likely see some lingering cloud cover in the southern part of the state with some broken skies farther north near I-70. Area-wide we should see highs in the mid 50s on Saturday. 

GFS 500mb vorticity showing the lobe of energy that will bring our rain/snow chances Saturday night into Sunday.

The next system (depicted in the image above) moves into our area on Saturday night which will bring a chance for rain and potentially some rain mixed with snow. Matt is writing a more detailed article on snow chances that should be out later this afternoon. For now, I still have a similar line of thinking as I did last night – precipitation should start as rain area-wide but near I-70 and points north it may transition over to snow for a few hours before changing back over to rain. Temperatures Saturday night should range from just above freezing near I-70 to the upper 30s farther south.

Sunday will warm up into the mid-40s but rain chances will linger through the afternoon until the wave moves off to the east. Sunday night should begin to dry out for us with lows dipping into the upper 20s-low 30s as we start a quiet weather period heading into next week. 

Monday and Tuesday look quite similar with plenty of sunshine and highs reaching the mid-upper 40s and overnight lows falling into the upper 20s. Tranquil weather currently looks to extend through the work week but we’ll keep an eye on it just in case things change.