Area Forecast Discussion
Issued by NWS Honolulu, HI

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000
FXHW60 PHFO 130149
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
349 PM HST Sat Jun 12 2021

.SYNOPSIS...
Moderate to breezy trade winds will continue into next week. Low
clouds and showers will focus over windward areas, with showers
more active during nights and mornings. Daytime heating will
produce clouds and a few showers over the leeward slopes of the
Big Island during the afternoons and evenings. Increasing rainfall
is possible by midweek.

&&

.DISCUSSION...
Clouds and showers that lingered over Kauai through the morning
finally cleared out of the lower elevations this afternoon, except
along the north facing coast. The rest of the state is mostly
clear this afternoon with the normal cloud buildups along the
windward slopes and the leeward Big Island slopes. Expect
increasing windward clouds and showers tonight with a few showers
reaching leeward locations. The Kona side of the Big Island will
see clearing skies tonight as downslope winds dissipate the
afternoon clouds.

High pressure far north northwest of the islands will maintain
moderate to breezy trade winds. The high will slowly make its way
eastward across the north central Pacific as a complex low and
front form along the dateline. The weather story for Hawaii will
remain in place into next week as the high maintains moderate
trade winds, and stability aloft keeps showers mainly relegated to
windward and mountain areas. Some of these showers will sneak
over to leeward locations mainly from the late afternoon to early
morning hours. An upper low may develop near the islands Tuesday
as a frontal boundary approaches from the north. This would lead
to an increase in shower coverage and intensity through midweek,
mainly for Kauai and Oahu.

&&

.AVIATION...
Breezy trades will continue to focus clouds and showers over the
windward coasts and slopes of the islands for the next couple of
days. Prevailing VFR conditions are expected at all locations for
the remainder of the evening, followed by areas of MVFR again
overnight into Sunday morning as shower activity picks back up.
AIRMET Sierra may be needed again tonight with the more widespread
showers.

AIRMET Tango for tempo moderate turbulence remains in effect over
and downwind of island terrain due to the breezy trades, though
may be able to be taken down later tonight as winds begin to taper
off.

&&

.MARINE...
A high north of the islands will weaken over the next couple of
days, resulting in a weakening of the trade wind speeds. The
Small Craft Advisory that was posted for today has been cancelled
for all areas as winds have fallen below advisory levels. Winds
may slightly strengthen again around midweek. A weak front will
approach from the north and weaken near Kauai around the middle of
next week.

A small north swell will arrive Monday and will increase the surf
along north facing shores and some east facing shores with a
northern exposure into the small to moderate range. Moderate wind
swell will generate choppy conditions along east facing shores
into next week. A series of small but long period south swells
will maintain small surf along the south facing shores into next
week.

&&

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

&&

$$

DISCUSSION...Morrison
AVIATION...TS
MARINE...Foster


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