MENOMONIE, Wis. (AP) – The State Patrol says heavy snow in northwestern Wisconsin is a factor in a fatal interstate crash between two semis.  Sgt. David Fish says one semi rolled over a slippery Interstate 94 near Menomonie and was struck by the second semi early Thursday morning. Fish says the driver of the first semi was killed.   Parts of northwestern Wisconsin are buried under more than a foot of new snow.  Numerous school districts canceled classes, including Menomonie, River Falls, Chetek, Rice Lake, Barron and Durand.  The National Weather Service reported 14 inches of snow has fallen in Ellsworth with 9 inches in River Falls and 8 inches in Ashland. Utility crews worked to restore power to hundreds of Xcel customers in the region.