482
FXHW60 PHFO 171404
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
404 AM HST Mon Aug 17 2026

.SYNOPSIS...

Tropical Storm Lala is continuing to move west of the state. Some
lingering showers remain over Kauai and will continue to taper
off today. Trade wind pattern returns Tuesday with windward and
mauka showers. Later this week winds may veer slightly southeast.

&&

.DISCUSSION...

Radar and satellite show some showers along windward Oahu and some
leftover bands of rain from Tropical Storm Lala moving over Kauai
and Niihau. Showers will continue to dissipate as trade wind
weather returns.

Tropical Storm Lala continues to move away to the west, well
southwest of Kauai. Tropical storm warnings are cancelled. The
Flash Flood watch has also be cancelled. With the departure of
Lala winds will ease into the moderate category. Inversion depth
and PWATs will remain a little higher than normal through the
upcoming week, leading to relatively wet trades. Showers can be
expected over windward and mauka locations with some isolated
spillover into leeward areas. These trades will veer to the east-
southeast Thursday night, and remain that way through next
weekend.

&&

.AVIATION...

Categories will gradually improve from tempo IFR to prevailing
MVFR to overall VFR through the period. Tropical Storm Lala,
currently located about 250 miles southwest of Lihue, Kauai
continues to move westward at 10 mph. This will institute a return
to generally light trade winds that will pull a drier air mass
across the region. The result will be less SHRA and lifted
ceilings from occasional MVFR to prevailing VFR this afternoon.

AIRMET SIERRA will be in effect this morning for mountain
obscuration for both windward Big Island and Kauai.

&&

.MARINE...

Tropical Storm Lala early this morning is approaching the far
western edge of the offshore waters as it continues to move west.
Fresh to locally strong easterly trade winds will gradually build
through the day from the east to west. As the associated strong
winds from Lala are now outside of the coastal waters, the Small
Craft Advisory (SCA) has been trimmed back for all zones except
for the windier waters and channels around Maui County and the Big
Island through tonight. By midweek trade winds look to ease
through the forecast period to gentle to fresh speeds across all
coastal waters.

Surf along south facing shores will remain elevated today from a
moderate medium to long period swell that has filled in overnight.
Surf will likely peak today before slowly declining through
midweek. Another long period south swell generated from gales
just south and east of New Zealand will begin arriving late this
week.

Surf along east facing shores will continue to decline today as
Lala progresses further west of the state. East facing shores will
remain small to moderate through the forecast period. North facing
shores will remain tiny with only wind wave-driven chop in tandem
with the declining east swell wrap.

&&

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

&&

$$


DISCUSSION...Walsh
AVIATION...Blood
MARINE...Shigesato