Officials survey a gaping sinkhole that opened up a residential street on Chicago's South Side after a cast iron water main dating back to 1915 broke during a massive rain storm, Thursday, April 18, 2013, in Chicago. The hole spanned the entire width of the road and chewed up grassy areas abutting the sidewalk. Two of the cars that disappeared inside had been parked, but a third was being driven when the road buckled and caved in. Only the hood of one of the vehicles can be seen peeking from the chasm.(AP Photo/M. Spencer Green)ST. LOUIS (AP) — A powerful spring storm system stretching from southern Texas to northern Michigan unleashed a wave of climate extremes on the Midwest on Thursday and threatened to convey its mix of arduous rains, excessive winds and extreme thunderstorms to the East via the weekend.