Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
307 AM EDT Sat Apr 17 2021

Valid 00Z Sun Apr 18 2021 - 00Z Sun Apr 25 2021

A pair of upper lows will wobble from the Northeast Pacific into
western North America during the next week as upper heights slowly
rise near Hawai'i. A weak boundary may touch off some showers
during the next few days as trades remain light but increase
Sunday into Monday out of the east to southeast. With atmospheric
moisture below average, generally light windward/mauka showers are
expected next week as a frontal boundary sinks southward toward
Kauai. This front may be fighting upper ridging that may build in
from the west by late in the week/next weekend per the ensembles
and ECMWF/Canadian (GFS was a bit weaker). Overall prefer a
solution nearer to the ECMWF as it has had a better, though not
perfect, handle on the amplified Pacific pattern overall vs the
GFS.

Fracasso