A late season heatwave is set to impact the state today through this weekend…
A stagnant pattern is in place, with Hurricane Maria and Tropical Storm Jose in the Western Atlantic creating some blocking. This pattern will aide in the expansion and strengthening of a high pressure ridge across the Eastern US, which will lead to warm to hot temperatures across a large portions of the Central and Eastern U.S. the next several days. These temps, along with moderate moisture levels and moderate heat index values, will continue through the weekend.
Things have quickly kicked off today with temps in the low to mid 90’s across much of the state. Widespread temps into the low to mid 90’s are likely through Saturday, with temps moderating a bit Sunday through Tuesday, when mid 80’s to low 90’s are expected. Additionally, low temperatures will be quite mild as well, likely staying in the 60’s for many areas for this period. Urban areas may see low temps in the low 70’s the next few nights as well. It is likely that some areas will tie or break record high temperatures one or more days during this period.
Additionally, abnormally moderate moisture levels are likely during the period as well, which will lead to moderate heat index values. Fairly dry conditions overall will likely exist during this period, with the best chances of rain being tonight across Northwest and Western Illinois, and then by Tuesday with the cold frontal passage.