This map of the upper-level winds several miles aloft shows the strongest winds, i.e. the jet stream, highlighted in blue. Note the huge trough in the East, which was responsible for pulling Sandy from far offshore back westward into the United States. Out west, another smaller dip in the jet can be seen moving into the Pacific Northwest. That will amplify as it moves east by later in the weekend, and could fuel some energy for a weak coastal system along the mid-Atlantic coast by Sunday night.