Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
716 AM EST Sun Jan 17 2016

Valid 00Z Mon Jan 18 2016 - 00Z Mon Jan 25 2016

The 17/00Z GFS/ECMWF offered no surprises---and very nicely
support the current Hawai'i forecasts through day 7 (next Sunday).
The north Pacific will contain an active series of shortwaves ---
migrating along the 45N-50N latitude in what amounts to
fast-moving westerly flow. The ECENS/GEFS means have had a good
handle on the western hemispheric flow pattern of late --- and the
only minor detail difference in the 17/00Z deterministic ECMWF/GFS
revolves around the strength of a shortwave near 42N 155W for next
Saturday. The GEFS/GFS is a tad stronger and faster migrating the
shortwave downstream versus the ECENS/ECMWF.

These differences do not appreciably alter the upper-level ridge
building in from the west next week. Nor does it drastically
change the surface ridge migration across 30N latitude during this
particular forecast period.

Vojtesak