Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
747 AM EDT Fri Jun 15 2018

Valid 00Z Sat Jun 16 2018 - 00Z Sat Jun 23 2018

The forecast period begins on Friday with a large surface high
centered well to the northeast of Hawaii near 40 degrees north,
and remains nearly anchored in place through the middle of next
week over the eastern Pacific.  A couple of surface lows trailing
behind the large occluded low near the Aleutians today are
forecast to track well to the north of the state, with enough of
an influence for the associated trough to weaken the pressure
gradient and reduce the trades some.  Another surface high is
forecast to gradually build in to the northwest of Hawaii by the
middle of next week. 

A general northerly mid-tropospheric flow is expected going into
early next week with an upper level high to the west and a weak
upper low to the east,  This should prevent any significant surges
of deep tropical moisture northward across the state, with mainly
orographically driven trade wind showers expected.  Both the 00Z
EC mean and GEFS mean are in decent agreement on the synoptic
scale pattern across this domain through the medium range period. 

D. Hamrick