We remain in the warm sector today with above average temperatures and very high humidity. With dew points near 70 degrees, there's a very tropical feel to the air and an abundance of moisture to produce the growing risk for rain and storms. The trigger mechanism for that will pass through our region tonight in the form of a powerful cold front.
That boundary separates the sultry air from much cooler and drier conditions. As it traverses Southeast Wisconsin, we could experience some strong winds, small hail, and heavy downpours. Lingering rain showers will remain a potential for the first half of Tuesday on the backside of the system, but rapidly sinking, stable air will provide the opportunity for sunshine by later in the day. After that, a long stretch of much cooler, sunny, and dry conditions should persist from midweek into the weekend.