Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
830 AM EDT Wed Oct 09 2019

Valid 00Z Thu Oct 10 2019 - 00Z Thu Oct 17 2019

The model guidance is in pretty good agreement over the course of
the next week depicting a subtropical high aloft passing north of
Hawaii from east to west.  Meanwhile, a plume of moisture from a
tropical wave will be guided westard across Hawaii Thursday and
Friday as an upper-level low is forecast to develop well to the
northwest of the island chain.  Precipitable water values of over
2 inches are forecast to overspread the main islands of Hawaii on
Thursday.  This will favor a higher chance of heavy rainfall along
the east- and southeast-facing slopes, especially for the Big
Island.  The main moisture axis should be pushing off to the west
of the main islands later on Friday.  Wind directions will slowly
veer from the east to east-southeast as a high pressure ridge in
the lower levels builds in from the east, bringing drier air into
the region.  The drier conditions should persist through next
Wednesday.

Kong