Overview
- Storms produced gusts over 90 mph in Spencer, Iowa, and over 75 mph elsewhere, uprooting trees and downing power lines across the Upper Midwest.
- More than 170,000 customers in South Dakota, Minnesota, Iowa and Wisconsin remain without electricity following storm damage.
- Authorities confirmed a tornado in Dixon, South Dakota, and warn of continued isolated tornado and hail threats as the system advances.
- The derecho-like storm line is expected to push through Nebraska and reach the Illinois border by dawn, with Chicago-area thunderstorms likely Wednesday afternoon.
- Heat advisories and extreme heat warnings span nearly half the U.S., amplifying flash flood and health risks on already saturated grounds.