The first act of what's expected to be a stormy week brought torrential rains and damaging winds to the Rochester area.

Widespread street flooding was reported in Rochester and other communities in the region as humid and warm air streamed into southern Minnesota on Monday and sparked a system of severe storms. There were reports that up to six inches might have fallen in some areas, which prompted the National Weather Service to issue flash flood warnings in Olmsted and several surrounding counties through early Tuesday.

The National Weather Service also issued a Tornado Warning for a section of northern Mower County after radar indicated a possible twister, while a tornado touchdown was reported just outside Mason City, Iowa.  Straight line winds topping 60-mph downed numerous trees and power lines, resulting in power outages in many areas.

Forecasters are predicting another round of storms, with the possibility of severe weather, on Tuesday.