We've received lots of snow in Mpls this year (see Metrodome) and recently noticed some water damage on a 2nd floor ceiling. Inspection of the attic indicated a pile of snow directly under a turbine vent. I've never had issues prior to this winter. So, I was going to move the insulation away from the affected area and let it dry out. Any suggestions on preventing this issue the rest of the winter? Safe to say I should replace the turbine with a different type of vent in the spring?