268 
FXHW60 PHFO 212003
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
1003 AM HST Fri Apr 21 2023

.SYNOPSIS...
Light southeast winds will continue into next week, allowing sea
breezes to bring clouds and showers over the island interiors each
afternoon. A weak front will move over Kauai Monday night, then 
stall and dissipate over the central part of the state through 
midweek.

&&

.DISCUSSION...
Visible satellite and radar show couple of areas of clouds and 
showers remain from a weakening trough just northeast of Hawaii. 
A north to south oriented band is brining scattered clouds and
showers to the windward side of the Big Island this morning. A 
second area of clouds and showers is impacting the windward side
of Oahu.

High pressure is centered far northeast of the state while low 
pressure system is located far to the northwest, resulting in 
light southeast winds across the state today. The trough the 
northeast will also acting to weaken the background southeast wind
flow through Friday before lifting north of the state this 
weekend. Winds will continue to stay light and southeasterly as 
the front to the northwest approaches.

Expect lingering low clouds and showers over the windward
Big Island today along the aforementioned band, which will slowly
shift northwest up the island chain to Maui County and Oahu 
Friday before clearing the islands. Showers associated with this 
band will focus over windward and southeast slopes. In addition, 
the light winds will allow for sea breezes to set up over all 
islands resulting in cloud build ups and showers across the island
interiors each afternoon before clearing at night with this
pattern continuing into early next week.

The weakened front is expected to arrive on Kauai Monday night 
with light to moderate trade winds overrunning this feature. The
front will stall and dissipate over the central portion of the
state through at least midweek with relatively light trade winds
focusing the low clouds and showers over windward slopes.


&&

.AVIATION...
Light to moderate east to southeast winds will allow afternoon 
sea breezes and overnight land breezes to form over each island
for the next couple of days. Passing showers are forecast today 
as a weak trough drifts westward across the region, as well as
inland clouds and a few showers with the sea breeze and daytime
heating. Brief MVFR conditions are possible within these showers.

No AIRMETs are currently in effect. Will monitor for possible
AIRMET Sierra this afternoon if showers/low clouds become more
widespread.



&&

.MARINE...
A trough just north of the state will help support light to 
moderate east to southeast winds across the area into Saturday.
Some of the typically windier waters around Maui County and the
Big Island may see winds exceeding the Small Craft Advisory (SCA)
threshold on Saturday. Winds will ease again late Saturday 
through Monday as front approaches from the northwest. Light trade
winds will return from Tuesday to Wednesday as a high pressure 
builds behind the weakening front.

A boost in surf along north and west facing is expected this
weekend as the current short period west-northwest swell fades 
and a new long period swell northwest swell builds in tomorrow 
morning. The new swell should peak Saturday night, but only to be
reinforced by a medium period northwest swell Sunday afternoon 
and Monday.

Surf along south facing shores will also see a boost this weekend. A
new long period south swell will arrive tonight and peak over the
weekend near the summertime average before slowly declining 
through the middle of next week. 

Surf along east facing shores will remain small through the middle
of next week under the lighter winds.



&&

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

&&

$$


DISCUSSION...Foster
AVIATION...TS
MARINE...EATON