The combination of heat and humidity this afternoon will easily push heat index values well into the 90s, close to 100 at times under mostly sunny skies. Unfortunately there will not be much relief in terms of a breeze as the overall pattern keeps weak winds over the area, so if you must be outdoors today make sure and take frequent breaks in the shade and drink plenty of water.
Storm chances this afternoon remain quiet low as our atmosphere will likely become capped off as the warmer temperatures move in. Our storm threat for this evening remains however the possibility for stronger storms is on the decline due to the aforementioned cap and weak dynamics/wind shear. The better ingredients for more severe thunderstorm coverage will come together to the north across parts of central Wisconsin. A complex of thunderstorms is likely to develop in that region and then begin sinking southward overnight, arriving in our local area late this evening.
A marginal risk for severe storms is in place over the entire area for an isolated stronger storm or two overnight with the threat of gusty winds and small hail. Frequent lightning and brief heavy rainfall will also be likely with any storm that can sustain itself after dark this evening.
Much quieter and less humid conditions can be expected for the end of the week into the upcoming weekend before we turn more active again by the beginning of next week.