Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 707 AM EST Fri Dec 11 2015 Valid 00Z Sat Dec 12 2015 - 00Z Sat Dec 19 2015 The 11/00Z ECENS/GEFS ensemble forecast seemed to be a solid approach across the north Pacific this forecast period. With respect to the mid-level trough progression across Hawai'i this weekend --- the 11/00Z deterministic ECMWF run is a faster solution versus the GFS. Though both have the shortwave migrating north and east of the Island by Monday---the differences in their respective tracks---will be a short-term precipitation forecast challenge. Beyond Monday, high pressure is favored by build into the region and back to a moderate/brisk trade wind pattern. Vojtesak