Most humid air of summer arrives this weekend; heat advisory issued

 

The heat is back and this time it's not just about the hot temps but also about the humidity. The highs on Saturday and Sunday will likely reach the low 90s which we've had a few times this summer, but the humidity will be oppressive at times. 

A heat advisory has been issued for all of southeast Wisconsin for Saturday afternoon and evening when the weekend heat will be at its worst levels. 

The heat starts to build in Friday with highs in the upper 80s. Saturday will be the hottest day with low 90s for heat. Sunday's temps will depend on how rain develops, leaves and how clouds react Sunday morning but upper 80s to around 90 are expected.

When it comes to humidity, Friday will be muggy with dew points in the upper 60s. That won't feel too bad considering it's been pretty muggy around here for almost two weeks but the humidity on Saturday and Sunday will be miserable. With dew points in the middle 70s it's the most moisture we've felt this summer and our first time in the oppressive category. 

Combine the heat and the humidity and the heat index will likely rise into the 100s. Peak heat indices on Saturday afternoon will likely be in the 95-105* range which is why the heat advisory was issued. 

With all the heat and humidity there will be a few chances for storms. Both Friday and Saturday nights we will watch a cluster of storms developing to our northwest in Minnesota and NW Wisconsin. The cluster Friday night could impact some of our northern counties. Saturday night's round of storms looks a little more likely to move into southeast Wisconsin.

If we do see the storms Saturday night into Sunday morning they could be strong to borderline severe with heavy rain and damaging wind. Our northern counties are in the slight risk for severe weather. 

Download the CBS 58 Ready Weather app to see just how hot it's going to feel where you live and track the weekend storms.