We've had a nice start to the weekend with sunny skies and temperatures hitting the low 80°s. However, you'll want to enjoy the nice weather while you can because we are under a Slight risk for severe weather tonight. Clouds will start to build up around 7pm, but thunderstorms won't start until between 9-10pm when a cold front will move in.
The main threats will be hail and winds, but those threats vary depending on where you are in the Stateline. The larger-sized hail will stay up in central Wisconsin, but quarter-sized hail, and possibly a little bit larger, is expected in Green, Rock, and Walworth counties where instability will he higher for when the front moves in. Jo Daviess, Stephenson, Winnebago, Boone, and McHenry counties are only expected to see pea to dime-sized hail. Counties south of that have a low hail chance.
Strong, straight-line winds are expected mainly for counties along the Stateline. The front will be tracking to the south, but most of these storms will be tracking southeastward, which is why Whiteside, Lee, and the southern portion of Dekalb county have a low wind threat. However, parts of Carroll and Ogle counties have a chance for seeing some of the strong winds.
The cold front will move into our northern counties between 9-10pm, our central counties around 1am, and our southern counties around 4am. However, these storms will be weakening as they move through our area as instability will be lower down to the south. By the time the front reaches our southern counties, the storm chance will be low, but isolated showers are still possible. The front will move out around 7am, but around that time fog will be possible due to the lingering moisture we'll have on Sunday.
Scattered cloud cover on Sunday, but more sunshine will be seen on Monday before the heat and humidity moves back in on Tuesday. It'll stay with us for the rest of the week afterwards, and because of that we'll also have a chance for isolated thunderstorms during the week. However, we'll get a break from the storms on Friday before they return on Saturday.
Temperatures will be in the upper 80°s to low 90°s next week, with dew point temperatures expected to be in the mid 70°s.