Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
824 AM EDT Wed Oct 03 2018

Valid 00Z Thu Oct 04 2018 - 00Z Thu Oct 11 2018

Hurricane Walaka was currently lifting northward toward 20N and
will threaten portions of the Papahanaumokuakea Marine National
Monument into Thursday. To its east, over Hawai'i, an upper ridge
axis will remain over the region through Friday before splitting
to the northeast and southwest. Combined with Walaka's movement
northward, trades will veer from east-northeasterly to
southeasterly over most of the islands later this week into the
weekend and even south-southeasterly over the western islands as
the trailing trough behind Walaka attempts to push eastward. The
main moisture channel should remain just west of the Kauai but the
ensembles show moisture from the east flowing toward 165W which
will act to keep a showery pattern for the island chain into next
week. Precipitable water values should increase to about 1-2
standard deviations above average. A more typical trade wind
pattern will redevelop for next week with scattered windward/mauka
showers that will generally by light to locally moderate as
precipitable water values slowly lower.


Fracasso