After such a cool and quiet start to the month of August, we'll see the heat and humidity return the upper Midwest this weekend. There will be a pattern change in the jet-stream that will bring a warm and moist air mass to the Midwest.
A ridge will begin to build in the middle portion of the country shifting winds to more of a southerly flow Friday through Sunday. Temperatures will warm into the middle and upper 80s with heat index values potentially reaching the lower 90s by the weekend.
Dew points will warm into the upper 60s and lower 70s this weekend. Current model trends have dew points staying in the middle and upper 60s through most of the next week. Doesn't look like we'll have the cool and comfortable conditions back in the forecast for a while!
With the increase in moisture this weekend, scattered rain chances remain in the forecast through the weekend. I don't think we're looking at widespread rain chances Saturday and Sunday. Showers and storms will stay scattered through Sunday evening. Severe weather does not look likely at this time, but we'll keep an eye on the developing situation.