FREEZE WARNINGS for northwestern Illinois, and FROST ADVISORIES for the rest of the are extend from 3am Sunday night until 8 am Sunday morning. A ridge of Canadian high pressure extends from Canada through a center over Fargo, North Dakota through Iowa through another center in nothern Missouri, and then southward into the lower Mississippi River Valley as midnight Saturday night. The Stateline lies just east of the ridge with drier air dissipating the stratocumulus clouds that were across the area all day on Saturday. With clearing skies, light winds and lower dew point air moving in from the northwest, frost will form in the overnight, and become widespread after 3 am persisting through daybreak on Sunday. This frost event is likely to cause damage to the most vulnerable sensitive annual garden vegetables and flowers. If you have not covered them up, you may have to replant. You will be able to tell by late morning the extent of the damage. The strong May sun will boost temperatures rather rapidly on Sunday morning to comfortable levels by the noon hour. It will be a very pleasant afternoon with some high level cirrus filtering the sunshine a bit with temperatures in the low 60's along with light winds. The high pressure will shift off to the east on Sunday night as the next weather system to affect the Stateline develops over the plains. Winds will become southeast on Sunday night, and continue southeasterly on Monday. with a warm front approaching from the southwest, moisture overrunning the front will cloud skies over on Monday, and may scatter some showers into our region on Monday afternoon. Significant rains are possible Monday night into early Tuesday as the warm front and assoicated low pressure storm center move across Illinois. That is the first of two sytems that will move though the area next week. Another system has the potential for producing some more heavy rains on Thursday night. Stay tuned.
By Meteorologist
Eric Nefstead
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