Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
727 AM EST Sun Mar 05 2017

Valid 00Z Mon Mar 06 2017 - 00Z Mon Mar 13 2017

The omega-block across the northern Pacific is depicted by the
majority of guidance to evolve toward a rex-block by next
Tuesday...with the low portion of the rex-block near 40N/165W
moving very little for several days afterward. The main impacts of
the blocking pattern and low will be to allow weak cold fronts to
slow down and stall over the islands...which will help maintain
precipitation chances through all of next week as well as variable
and mostly light winds. Models also agree that the highest chances
for more widespread precipitation will be toward the end of the
week. The main difference seen in the guidance concerns how the
low portion of the rex-block may weaken...with the 00z ecmwf the
most aggressive in splitting the low into 2 pieces which then
separate westward and eastward...while the 00-06z gfs maintain the
low longer. The current model spread and pattern have WPC leaning
toward the gfs direction of the solution envelope.

James