Westerly flow aloft due to fairly zonal flow until Friday afternoon. This will result in westerly winds today shifting to northwesterly winds this afternoon. A weak cold front will pass through to our north tonight, though this most likely will not result in any precipitation as it will be dry.  Westerly flow will dominate at least through Friday morning because of zonal flow with occasional west-northwesterly flow on Thursday around mid-day due to a shortwave or small trough that will move through the area.  Also note that this shortwave will most likely not cause precipitation as it is still fairly dry aloft.