Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
358 AM EDT Wed Mar 18 2020

Valid 00Z Thu Mar 19 2020 - 00Z Thu Mar 26 2020

...Heavy rainfall threat to subside by late in the week...

Today's guidance continues to show the Kona low currently to the
west of the state lifting northward and opening up over the next
couple days.  Expect the ongoing threat for periods of heavy
rainfall and possible thunderstorms to continue through midweek
and the shortwave axis to the south of the opening low does not
reach the main islands until Thursday night.  This could allow the
heavy rainfall potential to extend into Thursday.  There is
reasonable agreement that the western islands should see the best
potential for highest rainfall totals before the lighter trend
commences.  Generally southeasterly low level flow over the
islands should trend somewhat lighter by Friday-Saturday with the
northward departure of the Kona storm.  From Sunday into next week
the gradual movement of Pacific high pressure closer to the state
will establish a more typical trade pattern with winds likely to
be on the brisk side given the strong gradient south of the high. 
During this time frame expect windward/mountain-focused showers to
be fairly light as precipitable water values drop close to or
slightly below an inch.

Rausch