A weather system moved across the Stateline this evening. There was a threat of severe weather with this system, and he area was covered by a Severe Thunderstorm Watch for a time. No severe weather occurred across north central Illinois. In fact, very little rainfall was produced across Winnebago, Boone, Ogle or Lee counties. Severe weather passed across parts of southern Wisconsin with some areas receiving hail and damaging winds. Much of north central Illinois is beginning to suffer from the shortage of rainfall since May 1st. The Rockford airport has received only 0.64" since May 1st. The normal rainfall for that period is 3.57" yielding a deficit for the month of -2.93". You get the picture. Much of the area needs rain. There is a chance that some light to moderate rainfall could occur before the end of the week.
The cold front will sweep on toward the east overnight, and arc southwest across Toledo Ohio, Carbondale Illinois, and Fort Smith Arkansas by daybreak. High pressure over Montana will ridge eastward across Iowa into central Illinois. Skies will be mostly sunny, and it will become breezy by afternoon. It will be cooler and less humid with a high in the upper 70's. The winds will shift to northerly, and it will be mostly clear and colder on Tuesday night with a low in the upper 40's
High pressure will dominate the northern plains and mid west on Wednesday. Skies will start out mostly sunny, but it will become partly cloudy during the afternoon. With a north to northeast wind flow, it will be cool. The high temperature will be in the middle to upper 60's. Clouds will be on the increase on Wednesday night along with some scattered light rain showers as an upper low begins to edge its way slowly across the southern mid west. The low temperature on Wednesday night will be in the middle 40's.
On Thursday it will be mostly cloudy to cloudy and unseasonably cool. Highs should be in the middle 70's this time of year. On Thursday the temperature will struggle to reach 60 degrees. A high pressure ridge will be laid out east/west from the Dakotas across northern Wisconsin. The upper low will help to generate a surface low over eastern Oklahoma with an inverted trough of low pressure northward into Iowa. A stationary front will stretch eastward from the low across northern Arkansas across Tennessee. Over-running moisture from the gulf of Mexico will cause a vast area of cloud cover across a good part of the nation's midsection, along with widespread light rain . A chilly easterly breeze will blow across northern Illinois, and afternoon temperatures will be mostly in the upper 50's. Thursday night will be showery with a low around 48 degrees.
On Friday it will remain mostly cloudy and cool as low pressure moves to near Lexington Kentucky by 6 am. Showers will continue in the morning, and become less likely by afternoon. A chilly northerly breeze will blow, as temperatures rise into the low 60's by afternoon.
High pressure will settle on off to the southeast during the weekend, and temperatures will moderate upward back into the 70's. There will be a slight chance of showers on Saturday, and perhaps an isolated thunderstorm by Sunday afternoon.
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