Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
809 AM EDT Mon Jul 15 2019

Valid 00Z Tue Jul 16 2019 - 00Z Tue Jul 23 2019

A strong upper high to the north of the region (near 160W and
close to 6000m) will slide eastward this week to about 145W and
weaken. This will allow easterly flow aloft to carry a mid-level
trough over Hawai'i with enhanced periods of showers and breezy
trades as the surface high strengthens to about 1031-1032mb
tomorrow/Wednesday. The ensembles and recent 06Z GFS/00Z ECMWF
forecast a rise in precipitable water values to about 1.75 inches
around 00Z-12Z Friday (due in part to the remnants of TD 4-E) as
the wave passes. Otherwise, precipitable water values near or
slightly above average will favor a fairly typical trade wind
pattern that favors windward/mauka areas as the upper high
reorganizes to the northwest of the state.

Fracasso