(Kent, WA)  --  The Portland Winterhawks are moving on to the second round of the WHL Playoffs.  Nic Petan scored the winning goal with 59 seconds left in overtime as the Winterhawks beat the Seattle Thunderbirds 5-4 in Game Six of their series in Washington.  Portland is into the second round for a sixth straight season.  The Hawks will face either Everett or Spokane next.