hello if the problem started after the snow its possible wipers were froozen to windshield.when they went to move it bent the wiper linkage.if the problem was there before the snow then it sounds like they were misaligned.ck linkage for being bent.if all is ok take wipers off,turn wipers on/off so they are in park position,install wipers so they are down where they are supossed to be good luck hope this helps