There is a heat wave gripping the eastern two thirds of the country. Given that the 90s are going to last for most everywhere east of the Rockies through Memorial Day, we can accurately call it a heat wave. It will break by Tuesday, thanks to an advancing system from the northern Rockies, and Alberto, from the Gulf of Mexico, but in the meantime, Sunday looks to be the hottest day of the three. Take a look at the NWS forecast highs for Sunday.
It’s going to be a little drier through southern Minnesota and northern Iowa, which is why it will actually be a bit warmer. It won’t feel any better in St. Louis, where it’s 93, than Minneapolis at 97, I can tell you that much.