It's been a cooler stretch in the Stateline lately, but that's about to change in a big way next week! Starting Sunday, temperatures will rise back above average for the early part of the week. Highs push the mid-60s Sunday, then 70s Monday and Tuesday. Overnight lows will be very mild starting Sunday night, remaining in the 40s and 50s. That is, until our next cold front arrives.
Ahead of this front, we will see substantial instability, or storm energy, develop in the atmosphere Monday. The afternoon will be capped, preventing much if not all storm development. But overnight that cap will erode, allowing storms to form in Northern Illinois and Southern Wisconsin. Timing looks to be primarily after 10PM Monday.
A few of these storms may be capable of producing large hail and gusty winds. Any storms that produce 1" diameter hail or 60 mph wind gusts will reach severe limits. The Storm Prediction Center has placed Northern Illinois into Central Wisconsin under a Level 1/5 Marginal Risk for severe weather, indicating a few severe storms may be possible. Our primary threat will be with the large hail, but an isolated severe wind gust cannot be ruled out either.
Additional showers and storms will be possible along a passing cold front Tuesday as well, with a similar risk for some isolated severe storms. The best coverage will pass South and East of the area by Tuesday evening as cooler and drier air arrives through the course of the day. High temperatures Wednesday and Thursday will likely be back in the 40s.
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