Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
828 AM EDT Mon Sep 23 2019

Valid 00Z Tue Sep 24 2019 - 00Z Tue Oct 01 2019

Tropical moisture will continue to be drawn into the region as an
upper-level low drifts west-northwest of the islands, meanwhile
high pressure anchored northeast of the region will allow a
slightly less moist air mass to begin infiltrating. The trade
winds are expected to increase during this time. This moisture
axis will be slow in shifting from east to west and is expected to
stall over the western islands by the end of the week. This will
help maintain numerous shower activity across the eastern islands
early on then the activity begins to diminish while likely
resulting in periods of heavy rainfall over the western islands
midweek and beyond.  

Campbell