 Meanwhile, a cold front swinging through the northern plains will trigger some afternoon thunderstorms from the Dakotas and Nebraska east into Minnesota and Iowa. Expect a mix of clouds and sunshine from St. Louis and Chicago over toward Detroit. Otherwise, a straight afternoon thunderstorm cannot be ruled out in these areas. Daytime heating will lead to afternoon thunderstorms popping up over parts of Arizona, New Mexico, and western Texas, which can lead to localized flooding. Otherwise, the big story out west will continue to be the ongoing heat wave with highs in the 90s across interior sections of the west.