Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
428 AM EDT Tue Jun 15 2021

Valid 00Z Wed Jun 16 2021 - 00Z Wed Jun 23 2021

Trades will initially be moderate to brisk as high pressure
settles over the eastern Pacific.  Winds may trend a bit lighter
for Friday-Tuesday as the pressure gradient slackens a bit.  This
pattern will support mainly windward/mountain focus for showers
but some rainfall may reach leeward locales at times.  One band of
moisture associated with a weakening front may brush the
northwestern islands into Wednesday while another pocket of
moisture crosses the area from east to west after midweek. 
Precipitable water values will likely trend to near or slightly
below normal values for the rest of the period, with any areas of
greater moisture likely passing by to the south.  Latest guidance
is gradually refining the evolution aloft, with a weakness
mid-late week forming a better defined upper low just northeast of
the state late Friday through the weekend.  Then an upper ridge
building in from the east should push the upper low to the
west/north.  The weakness/upper low may produce some enhancement
to rainfall at times from midweek through the weekend.

Rausch