An area of high pressure is ridging southward out of Canada across the northern and central plains. The northerly wind flow to the east of the ridge across the upper midwest is bringing very chilly dy air into the Stateline. A FROST ADVISORY is in effect for north central Illinois from 1 am Sunday until 7 am Sunday morning. With winds dying off, and very dry low dew point air in place, temperatures will fall quickly with strong radiational cooling. Frost is likely to begin to develop in spots after 1 am and become widespread just before daybreak.
After a cold frosty start, temperatures will warm up quickly on Sunday under the influence of more than 12 hours of full sunshine through crystal blue skies. The afternoon high will be close to the seasonal average in the low 60's. With light winds and clear skies again on Sunday night we can expect a rapid drop off in temperatures after dark to a low in the middle 30's early Monday morning. Monday will be another sunny day. Temperatures will edge up slowly from early to mid week as the high shifts eastward. By Wednesday night a low pressure storm system will be spinning over the central plains, and it may bring us some widely scattered showers. Chance of showers and some thunderstorms will increase Friday and Friday night, and may linger into next Saturday.
by Meteorologist
Eric Nefstead
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