Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
359 AM EDT Sat Aug 10 2024

Valid 00Z Sun Aug 11 2024 - 00Z Sun Aug 18 2024

Trade winds should gradually strengthen back to breezy levels this
weekend as a surface high drifts toward Hawaii (though staying
well north). The high is forecast to meander around 40N and
maintain the typical pressure gradient for breezy easterly trades
through much of next week, with some model signal to strengthen
even further by late week. Through the period, some showers are
possible favoring typical windward/mauka areas but occasionally
spilling into leeward areas. Coverage and amounts of rain will
vary from day to day. A slight uptick in showers is possible
around Sunday with some weak moisture coming through. By around
Wednesday-Thursday, troughing in the mid-upper levels could
support more surges of moisture. The GFS indicates above normal
precipitable water values across the state by Wednesday while the
ECMWF does not, but both the GFS and ECMWF show a moisture plume
briefly moving across Thursday-Friday. Widespread heavy rain is
not expected, just a relatively wet trade wind pattern.


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