Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
813 AM EDT Fri May 17 2019

Valid 00Z Sat May 18 2019 - 00Z Sat May 25 2019

Models/ensembles show good consensus that upper-level ridging
should generally remain dominant across Hawaii through the next
week with a surface high north of the state keeping a trade wind
pattern in place. A weakness in the ridge is forecast to traverse
the state late Sun into Mon, but with limited moisture only a
modest increase in windward shower activity is expected with this
feature. By mid to late next week, upper ridging is expected to
expand northward between Hawaii and Alaska as part of a broad
mid-latitude flow amplification forecast around much of the
northern hemisphere. With an upper trough amplifying well
northwest of Hawaii, this setup should begin to increase moisture
across the state, with further increase in low-level moisture
aided by veering of low-level winds to east-southeasterly.

Ryan