Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 809 AM EDT Thu Oct 09 2014 Valid 00Z Fri Oct 10 2014 - 00Z Fri Oct 17 2014 The 8/00Z ECENS/GEFS were in adjustment 'mode' for a brief time period along the western coast of North America between 12/12Z and 14/00Z, and the 9/00Z ensembles---both GEFS/ECENS have resolved those issues across the eastern Pacific and Gulf of Alaska. Recommend taking a deterministic 9/00Z ECMWF approach through the end of day 5 (Tuesday) as the mid-level circulation migrates westward through the Islands. For day 6-7...more adjustment for the global guidance between the Dateline and east coast of Asia---with the 9/00Z GEFS/ECENS taking two different approaches with remnant tropical moisture entrainment into the mid-latitude westerlies. This seems to be a typical October (or transition season forecast issue) across the northern Pacific in an accelerated westerly flow. Two discernible shortwaves attempt to form within the flow pattern and recommend leaning towards the ECENS for the medium range period forecast in the eastern Pacific heading into day 8 (next Friday). The primary issue that remains unclear---is the path, incorporation and evolution of 'Vongfong' in the mid-latitude flow between northern Japan and the Kamchatka peninsula in the day 5-6 time frame. This feature eventually impacts the structure of the western portion of the Subtropical Ridge. Vojtesak