Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
258 AM EST Tue Dec 29 2020

Valid 00Z Wed Dec 30 2020 - 00Z Wed Jan 6 2021

The weather pattern over Hawaii and adjacent marine areas is
expected to be relatively benign over the upcoming week.  A
rapidly developing surface low over the North Pacific for the
middle of the week will lead to a cold front approaching, and then
stalling near the northwestern Islands through Thursday before
gradually dissipating.  The resulting col in the surface ridge
will lead to lighter trades through Thursday, before increasing
some for Friday and into the upcoming weekend as the surface ridge
near 30 degrees north builds back in. 

Both the GEFS and EC means are in good overall synoptic scale
agreement through the medium range period across this domain, and
both indicate a weak upper level trough that will likely be
situated east of the Big Island by Friday and early Saturday,
followed by upper level ridging over the region by early next
week.  With the exception of the typical windward showers, no
major episodes of significant rainfall are anticipated at this
time.

Hamrick