Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
720 AM EDT Wed Jun 27 2018

Valid 00Z Thu Jun 28 2018 - 00Z Thu Jul 05 2018

An upper level trough drifts east to a position north of the
islands over the weekend into early next week, when it resumes a
slow westward motion.
Inn its place a high amplitude north Pacific ridge builds east of
the islands and slowly approaches.

The low level ridge with embedded closed highs drifts north of the
islands
later this week before drifting northeast this weekend and back
north of the islands early next week.

The persistence of the low level ridging results in a uniform
pressure gradient supporting moderate to brisk easterly trades the
balance of this week and into the middle of next week. There is
one period this weekend when he high located further away allows
the trades to slacken a bit before picking up next week.

The 06Z GFS/GEFS and 00Z ECMWF/ECMWF ensemble mean showed good
agreement on the forecast into next week and a blend of those
solutions is recommended.  Expect mostly windward showers through
the rest of the week, weekend, and into the middle of next week,
with higher totals in windward areas with stronger terrain
gradients.

Petersen