Ahuimanu, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

232
FXHW60 PHFO 130104
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
304 PM HST Tue Aug 12 2025

.SYNOPSIS...

A high pressure ridge building back in across the Hawaiian Islands
will bring moderate to locally breezy trades through Wednesday. A
low level trough will move in Thursday weakening the trades and
increasing clouds and showers through Friday. High pressure will
build back in across the region will bring a return to moderate to
locally breezy trade winds through early next week.


&&

.DISCUSSION...

Satellite and radar imagery this afternoon show a band of clouds
moving in on the trades with some isolated showers mostly along
windward and mauka slopes. A strong ridge aloft will cap shower
activity and limit clouds through Wednesday with windward and
mauka areas seeing clouds and showers overnight into the early
morning hours. Trade winds will strengthen into the moderate to
locally breezy range through Wednesday.

Thursday and Friday the weather pattern changes as an easterly
wave drifting in on the trades moves into the eastern side of the
state. Trades will decrease and local scale island heating will
drive afternoon sea breezes across the state. Clouds and showers
will increase from east to west across the island chain as
dynamics associated with the passing trough lift inversion heights
to around 8,000 feet through Friday evening.

This trough will drift away from the islands late Friday with the
ridge building back into the region, bringing stable weather and
increasing trades from Saturday onward into early next week.


&&

.AVIATION...

Moderate to locally breezy trade winds continue tonight with
mainly VFR conditions expected.

AIRMET Sierra posted for tempo mountain obscurations above 2500
feet along windward sides of Oahu with VFR elsewhere.

Possible AIRMET Sierra for mountain obscurations along windward
sides of the islands through the overnight and into Wednesday
morning.


&&

.MARINE...

A weak ridge extending south from its parent surface high over
the north Pacific is settling in over the islands as Hurricane
Henriette continues to move far northwest of the islands. Moderate
to locally strong trade winds are spreading across the island.
A Small Craft Advisory (SCA) remains in effect for the windier
waters and channels around Maui County and the Big Island through
Wednesday afternoon. A weak surface trough will advance westward
across the state around Thursday, resulting in a brief period of
light easterlies which may become variable in direction at times.
Locally fresh trades return Friday into the weekend.

The current south swell will continue to gradually decline through
the middle of the week. A small long-period south swell is expected
to fill in by Saturday to bring surf heights back up for the weekend,
though likely remaining below advisory level.

Surf along east facing shores will see a slight uptick through
Wednesday, before declining slightly Thursday and Friday. Short
period chop increases this weekend again as stronger trades develop.
Surf along north facing shores will remain tiny through the forecast
period.


&&

.FIRE WEATHER...

Wind speeds, humidity levels and weather conditions will likely
remain below critical fire weather thresholds this week. Drier
and more stable trade winds will return from Saturday onward into
early next week.


&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST Wednesday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.


&&

$$


DISCUSSION...Walsh
AVIATION...Foster
MARINE...TS
FIRE WEATHER...Walsh