Thunderstorms soaked the Plains with heavy rain that flooded basements, roads and farmland, while 85 m.p.h. winds knocked down power lines. A band of thunderstorms stretched from northern Colorado and southeast Wyoming across northwest Nebraska to central Minnesota, the National Weather Service said. In South Dakota, 5.5 inches of rain pushed streams over their banks in Corsica and nearly 4 inches of rain drenched Armour. Highway 50 east of Lake Andes and Highway 44 between Platte and Parkston were under water, police said. In Nebraska, heavy rain turned the normally dry Panhandle into a quagmire.