Numerous severe thunderstorms moved around the Stateline late Monday morning and afternoon, prompted several severe thunderstorm and tornado warnings. The storms formed along the outer edges of the high heat, humidity, and instability and were very quick to intensify across Wisconsin and northeast Illinois. There were several reports of large hail, damaging winds, and tornadoes. This left the majority of the immediate viewing area high and dry, and just plain hot and humid! Peak heat index values reached upwards of 115 degrees during the afternoon, with a couple sites even coming close to 120!
While our focus has been on the heat and humidity this afternoon, there are a few showers that are starting to develop along a couple outflow boundaries this evening located across Rock County. A few showers have popped between Janesville and Beloit and are drifting to the south/southeast.
Should the showers continue to develop there is still enough heat and instability to allow for an isolated storm or two through 9pm. And with the amount of instability a severe storm or two cannot be ruled out. So, with that I think our highest chance for thunderstorms (still around 20-30 percent coverage) will be along and east of I-39 through late evening. Should any storm reach severe limits, strong wind gusts and very heavy rainfall can't be ruled out. I'll be keeping a close eye on radar over the next couple of hours.
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