Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
338 AM EDT Thu Apr 23 2020

Valid 00Z Fri Apr 24 2020 - 00Z Fri May 01 2020

Expect typical trade wind conditions over the next seven days with
generally windward/mountain shower focus.  Most rainfall should be
fairly light given precipitable water values within a standard
deviation of normal, tending to be lower over the southeastern
islands relative to the northwestern islands.  A front initially
just to the northwest should linger there into the weekend before
weakening/moving westward.  Moderate to brisk trades late this
week into the weekend may slacken a bit for a time early next week
as a front temporarily weakens the surface ridge to the north of
the state.  This front may reach close to the islands by next
Wednesday-Thursday while trailing high pressure returns the trade
flow close to prior strength.  Guidance spread for this front is
fairly modest for the 6-7 day time frame.  Aloft there are
noticeable differences for the eastward expansion of upper ridging
toward/over the state from Monday onward.  The 12Z ECMWF mean
shows a good intermediate solution between the faster 00Z
ECMWF/CMC and slower GFS/GEFS mean.     

Rausch