Royal Kunia, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

302
FXHW60 PHFO 221309
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
309 AM HST Sat Feb 22 2025

.SYNOPSIS...
Light east to southeast winds and mostly dry conditions will
prevail through early next week, with a few showers possible along
windward slopes and coasts at night and over the island interiors
each afternoon. A cold fronts will approach from the northwest
around the middle of next week, shifting winds more southerly and
bringing an increase in showers, particularly over the western
end of the state.

&&

.DISCUSSION...
Currently at the surface, a 1026 mb high is centered around 1800
miles east-northeast of Honolulu, with a ridge extending
southwestward to a location near or just north of Kauai. Land
breezes prevail across much of the state, with unsheltered
sections of Maui and the Big Island seeing light to moderate
east-southeast trade winds. Infrared satellite imagery shows
mostly clear to partly cloudy conditions. Radar imagery shows a
few showers moving into windward and southeast facing slopes of
Maui and the Big Island, with little if any shower activity
elsewhere. Main short term focus revolves around wind trends and
rain chances.

The ridge of high pressure near Kauai will remain nearly
stationary today, keeping land and sea breezes dominant over the
western islands, while light to moderate trades hold over the
eastern end of the state. A new high building north of the area
is expected to bring a brief return of light to moderate trades
statewide on Sunday, before the approach of a front eases the
trades again Monday. Light to moderate trades may briefly fill
back in Tuesday, followed by a transition to more southerly flow
at light to moderate speeds Wednesday and Thursday in advance of
another approaching front. This front is forecast to lift back
northward as a warm front late next week, allowing a return of
light to moderate east to southeast winds across the state.

As for the remaining weather details, mostly dry and stable
conditions are expected through Tuesday. There will still be a
few showers moving into windward slopes and coasts each night,
with a few daytime heating showers possible over the island
interiors each afternoon. Rainfall amounts should remain light
however with low and mid level ridging keeping inversion heights
suppressed. As winds turn southerly in advance of another front
Wednesday and Thursday, the boundary layer should moisten up and
inversion heights should rise, bringing an increase in showers,
particularly over the western end of the state. A land and sea
breeze pattern featuring windward showers at night and interior
showers during the day may return for the end of the upcoming
work week.

&&

.AVIATION...
Light and variable winds with overnight/early morning land
breezes and daytime sea breezes are expected through tonight as
the surface ridge remains in the area. Outside of a few early
morning light showers for windward coastal areas, the best chance
for clouds/showers will be through the afternoon period over
interior and leeward areas where sea breezes become established.
VFR conditions will prevail. Light to moderate trades will return
on Sunday, with clouds and light showers returning to windward and
mauka locations.

No AIRMETs are expected.

&&

.MARINE...
High pressure remains over the northeastern Pacific, with a ridge
extending southwest to just north of the islands. The ridge will
keep light and variable winds in place for the western end of the
state, and light to moderate southeasterly winds for the eastern
part of the state through tonight. Light to moderate easterly
trade wind flow will then return Sunday into Monday as high
pressure briefly rebuilds north of the state. A front could then
pass north of the islands and weaken the wind speeds again
Tuesday onward.

Current west-northwest swell will hold today before increasing
tonight into Sunday. Peak surf heights are expected to exceed
advisory levels and could potentially reach warning levels along
north and west facing shores Sunday. Will likely need a High Surf
Advisory or Warning issued sometime today. Another similarly-
sized northwest swell is expected to build in Tuesday night and
linger through Wednesday.

Small surf is expected along south and east facing shores.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Jelsema
AVIATION...Gibbs
MARINE...Tsamous