Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
720 AM EST Fri Jan 16 2015

Valid 00Z Sat Jan 17 2015 - 00Z Sat Jan 24 2015

Latest data shows maintainence of a well defined mid-latitude
storm track focused north of the state. This runs overtop an
east-west oriented mid-upper level ridge centered just south of
the Hawaiian Islands. Trades are disrupted in this pattern over
much of the next week. Model and ensemble forecast spread and
uncertainty seems quite low over the next week and show passage of
lead impulses aloft is supporting surface frontal system and
shower approach into the western islands today into this weekend.
Pacific flow amplification is expected to force a second frontal
approach to the state in about a week. This more amplified system
would offer increased potential for the return of deeper moisture
and heavier rainfall.

Schichtel