Strong low pressure is well to the east, over Lake Huron, and continues to move away from our region. A very large ridge of high pressure extends from the western shore of Hudson Bay in Canada southward across the Dakotas to the Texas panhandle. The gradient between the high and low is still rather tight so winds will be rather brisk from the northwest to north today at 12-24 mph with some gusts above 30 mph. It will be cool with a high only in the upper 50's. Winds did die down tonight as the high gets closer to the Stateline, and with clear skies the temperatures will drop into the middle 30's. Patchy frost is possible after midnight, and may be more widespread over northwestern Illinois. So a FROST ADVISORY has been issued for Stephenson county for tonight. High pressure sitting over Wisconsin on Saturday will provide the area with sunny skies and a light northerly breeze . The high will only be around 57 degrees. On Saturday night the center of the high will be very close to the Stateline. So, with nearly calm conditions, clear skies, and strong radiational cooling, the temperature will drop very close to freezing. Widespread frost can be expected late Saturday night lasting through the early morning hours on Sunday morning. It could be the official ending of the growing season of 2011. If you have any tender plants that you would like to keep alive, it would be a good idea to either cover them up the next couple of nights, or bring them inside. The ridge will remain over the area on Sunday as the center of the high moves southward across Illinois. The cool air will moderate with a high on Sunday afternoon around 67 degrees with full sunshine. Each day will get a little warmer next week with low 70s on Monday to around 80 degrees by Thursday. Skies will remain sunny to mostly sunny for the entire week.
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