DES MOINES (AP) ? Strong thunderstorms moving through Iowa are leaving tree branches scattered and in some locations breaking through power lines causing outages.MidAmerican Energy reports 1,640 customers without power with most of them located in the Des Moines area but dozens in Council Bluffs and Sioux City.Alliant Energy says it has 350 customers out mostly around Boone. No injuries have been reported. The ...