Lows this morning in Rockford dipped to -4°. I'm sorry to say it, but tonight will be even colder across the Stateline. The main culprit should be because we will be experiencing some cold air advection tonight. This means that in addition to our natural cooling that occurs at night, northwest winds will be bringing in even colder air from Canada. That coupled with decreasing clouds and a substantial snowpack gives me a good reason to forecast a low of -7° in Winnebago County with the rural areas getting close to -10°.Wind chills tonight will be hovering around 20 degrees below zero. Due to this, a WIND CHILL ADVISORY will be running from midnight to noon Thursday for all of northern Illinois. If you are in southern Wisconsin you will still be experiencing some dangerously cold conditions, but the National Weather Service office in Milwaukee is debating on whether to align with the other offices. I wanted to get their take on why they were holding out and here was their reply,
"Looking at that now. Besides the wind...the models are hinting at some cold air strato cu hanging on until midnight. That would keep winds from decoupling...but also prevent temps from dropping too rapidly. Preliminary calculations on expected temps/winds overnight keep us at -15 to -20...with the required 10 mph wind not holding up past midnight. Not planning on issuing at this time..."
Regardless of where you live, brace for the frigid conditions tonight. -ADAM
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