The National Weather service says heavy rains are possible as thunderstorms continue across much of Wisconsin early this week. National Weather Service meteorologist Marsha Cronce tells WFDL news there’s a good chance for thunderstorms Tuesday evening and again Wednesday in our listening area. "What we are in is a very warm and humid, unstable pattern," Cronce said. "What that means is that thunderstorms can develop anywhere and than not move quickly and that is why the heavy rain threat is there." Meanwhile Cronce says a tornado that caused minimal damage In Columbia County over the weekend was a weak tornado with winds of between 65-100 miles an hour.