Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
827 AM EDT Fri Jul 12 2019

Valid 00Z Sat Jul 13 2019 - 00Z Sat Jul 20 2019

The upper level ridge centered near 35 degrees north is forecast
to remain anchored in place north of Hawai'i through this forecast
period, with a gradual progression to the east with time.  The EC
mean is indicating a slighter stronger ridge than the GEFS mean. 
A col in the ridge near 145 degrees west is expected to evolve
into an inverted upper level trough passing over the state by the
early to middle part of next week as it tracks westward.

At the surface, trade winds will increase to 15 to 25 knots by
early next week as the high pressure ridge increases the pressure
gradient.  The easterly wave will likely result in a potential
increase in moisture and shower activity for early in the week. 
Once the wave passes the state, drier air is expected to return
with most showers confined to the terrain.

Hamrick