Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
805 AM EDT Mon Jul 09 2018

Valid 00Z Tue Jul 10 2018 - 00Z Tue Jul 17 2018

Upper-level ridging will gradually build over Hawaii over the next
couple days as a broad mid/upper-level weakness crossing the state
drifts westward. Expect windward shower activity to decrease
slightly over the next few days as subsidence increases in
association with the ridge. Surface high pressure will remain
anchored well north of the state, keeping 15-20 kt low-level
easterlies in place through the week. By late this week into the
weekend, models show another broad upper-level weakness
approaching Hawaii, perhaps centered just north of the state. As
this occurs, expect the surface pressure gradient to tighten a bit
with a slight increase in surface easterlies into the 20-25 kt
range. With the weakening upper ridge and increase in trades,
expect windward shower activity to increase once again by late
week into the weekend.

Ryan