WATCH LIVE AT 9PM: Sioux City officials holding news conference regarding potential flooding KTIV Siouxland's News Channel'Catastrophic flooding' in Upper Midwest prompts evacuations as record-breaking heat wave broils the West and mid-Atlantic Yahoo! Voices1 Dead in South Dakota After Midwest Rivers Flood The New York TimesFlooding in northwest Iowa leads to 250 water rescues, hundreds of properties destroyed ABC News