A Trend Towards Colder Weather

Canadian high pressure is forcing a cold front southward across the Stateline early this evening. There will not be any rain in far northern Illinois with this system, and will affect area to the south of Interstate 80 into central Illinois. It will be partly cloudy, breezy, and cooler tonight with a wind from the northeast at 10 to 20 mph. Skies will become mostly clear toward daybreak with a low around 43 degrees. It will be mostly sunny, breezy, and cooler on Wednesday with a high in the low 60's. The large area of Canadian high pressure over central Canada will build to the southeast across Ontario on Wednesday, and slowly across the Great Lakes Wednesday and Wednesday night. The pressure gradient will be tight enough to maintain a brisk northeast wind on Wednesday night, so the despite temperatures dropping into the middle 30's under clear skies, there probably will not be any frost. It will be sunny and chilly on Thursday with high temperatures only in the low 50's, and with the wind becoming light on Thursday night, there will be a good chance of frost with a low early Friday morning near freezing. The cold Canadian high will moderate as it moves into Ohio on Saturday. Winds in the Stateline will shift to the south under mostly sunny skies in the morning. By afternoon clouds will increase as temperatures warm up into the middle 60's. There is a slight chance of showers and thunderstorms in the afternoon with a new cool front appraoching from the northern and central plains. Scattered showers and thunderstorms will skips across parts of northern Illinois on Saturday night. The air behind the front is of Pacific origin so, no significant drop in temperature is expected on Sunday. The afternoon high will reach the low 60's. However, a Canadian cold front will press southeast across the area early on Monday morning. A cold Canadian high will follow in behind the front with the coldest air the Stateline has seen in nearly a month. Temperatures could easily drop below freezing early Tuesday morning, and the high on Tuesday expected to remain well below average in the upper 40's.