Saturday’s comfortable summer temperatures and humidity will feel a bit toastier in the days ahead. The periphery of this excessive heat dome from the Plains will hover near the Quad Cities on Sunday. This will send temperatures just over the 90 degree mark by the later afternoon hours. This dome is still scheduled to blossom across the Midwest starting the new week with lower 90s on Monday replaced with mid to upper 90s on Tuesday. In fact, my forecast high of 96 degrees on Tuesday will be the season’s warmest. No doubt, added humidity will be excessive with heat indices over 100 degrees.
Afterwards, I do see hints of a slight break from this oppressive heat for a couple of days before rejuvenating itself by the following weekend. Ever since last night’s computer models, there are signs that this hot bubble of air will shift slightly west Wednesday into Thursday allowing for a front boundary to slide along the periphery of the dome across the Midwest. Even though its predicted to remain warm during this period, an easterly wind behind the departing boundary may reduce afternoon highs in the upper 80s to around 90 with slightly lower humidity.
By the Labor Day weekend, the heat and humidity will make another unwelcome return with highs returning in the 90s.