Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
821 AM EDT Sun Jul 14 2019

Valid 00Z Mon Jul 15 2019 - 00Z Mon Jul 22 2019

A strong upper high to the northwest of the region (near 165W)
will slide eastward over the next week to about 145W and weaken.
This will allow easterly flow aloft to pass over Hawai'i with
periods of showers and increasing trades as the surface high
strengthens to about 1031mb early in the week. The 06Z GFS and 00Z
ECMWF forecast a rise in precipitable water values around 00Z
Friday to about 1.75 inches (due in part to the remnants of TD
4-E), with better agreement among the ensembles compared to 24 hrs
ago (in timing and strength). This will enhance shower activity on
windward slopes for about 12-24 hrs as it passes by. Otherwise,
precipitable water values near or slightly above average will
favor a fairly typical trade wind pattern.

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