Tropical storm Cristobal is expected to affect weather in the state of Minnesota this week. Jim Taggart with the National Weather Service in Chanhassen was asked why.

“It’s largely due to the speed of the system,” said Taggart. “It is supposed to be near Lake Superior by Wednesday. If the system slows down at all it could produce heavy rainfall and potentially some flooding.”

Taggart says the system most likely will affect far southeastern Minnesota in the area of Rochester and La Crosse, Wisconsin. The National Weather Service says 12 tropical systems have affected the Mississippi River Valley since 1850 with most producing only light rain.