Waianae, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

196
FXHW60 PHFO 150155
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
355 PM HST Thu Aug 14 2025

.SYNOPSIS...
Light trades continue through tonight as a low-level trough north
of the islands moves west. High pressure will build back in across
the region Friday into early Sunday bringing the return of moderate
to locally breezy trade winds. Another brief increase in clouds
and showers will develop Sunday afternoon into Monday as another
low-level trough (remnants of former Tropical Cyclone Ivo) moves
westward across the islands. Stable drying trends return beyond
Tuesday.

&&

.DISCUSSION...
Regional satellite imagery shows a low-level trough northeast of
the islands this afternoon. This has resulted in a hybrid sea
breezy pattern setting up across the state, with radar imagery
showing a few showers developing over sheltered leeward locations.
Guidance continues to show this trough moving west tonight which
will bring a slight increase in clouds and showers over windward
and mauka areas, with any lingering activity over leeward areas
dissipating this evening.

By Friday, a surface ridge will build north of the Hawaiian
Islands allowing moderate to locally breezy trades to return.
Drier air will filter in from the east as a very stable upper-
level ridge nudges its way back over the state. This will bring
lower trade wind inversion heights, with clouds and showers over
mainly windward and mauka areas through Sunday morning.

By Sunday afternoon, yet another disturbance will move from east
to west across the islands. This trough will have slightly
different island by island impacts as deeper moisture and
dynamics are associated with the remnants of former Tropical
Cyclone Ivo. This trough will increase humidity levels across the
state from Sunday afternoon through Monday. Inversion heights
will lift to around 8,000 to 9.000 feet enhancing clouds and
showers in a moderate trade wind weather pattern. Confidence in
this brief period of enhanced shower activity is only fair at
the moment. Typically these remnant tropical systems tend to be
compact in size and may possibly track a bit further north than
currently predicted. If this system does move further north then
our current weather forecast will change, resulting in less clouds
and showers reaching the Hawaiian Islands. Stay tuned for further
updates.

A high pressure ridge will swiftly build back into the region on
Tuesday, just as the remnant trough continues on its westward
journey away from the state. This returning ridge will bring
strong stable trends with drier humidity levels, and a return to
more typical dry summer weather across the state through the
middle of next week.

&&

.AVIATION...
Light trades have given way to a hybrid sea breeze pattern this
afternoon with flow directed increasingly onshore depending on the
degree of sheltering. Limited afternoon showers over leeward
zones will diminish with the loss of heating this evening. Trades
then gradually strengthen during Friday with any shower activity
focused windward and mauka.

No AIRMETs in effect.

&&

.MARINE...
Surface trough moving westward north of the waters will keep
light to locally moderate flow through tonight. Trade winds will
gradually strengthen Friday into the weekend as the high builds
north of the state. A Small Craft Advisory for the windier waters
and channels around Maui County and the Big Island could start as
early as Friday morning and hold through the weekend.

Surf along south facing shores will remain small through tonight
with mainly background medium to long period energy. Surf should
see a slight bump early Friday and hold through early next week as
a series of small long period southerly energy fills in.

A small, medium period northeast swell will keep surf along east
facing shores elevated through the weekend. As this swell declines,
the short period energy will fill in as trade winds increase into
the weekend. North facing shores will remain flat to tiny through
the forecast period except for areas that may be exposed to the
small northeast swell.

&&

.FIRE WEATHER...
Weather conditions should remain below critical fire weather
thresholds into early next week. A low-level trough north
of the islands will continue to move westward tonight producing a
slight increase in clouds and showers. Another low-level
disturbance associated with the remnants of former Tropical
Cyclone Ivo will likely increase humidity levels and shower trends
on Sunday and Monday. A return to lower humidity levels will
develop by Tuesday as a stable upper-level ridge builds back over
the island chain.

&&

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

&&

$$

DISCUSSION...Ahue
AVIATION...JVC
MARINE...TS
FIRE WEATHER...Ahue