Drought in Hawaii, June 1 to 30, 2020

Area Forecast Discussion
National Weather Service Honolulu HI
858 PM HST Sun May 31 2020

.SYNOPSIS...
Breezy trades will decrease over the next few days as high
pressure to our north drifts eastward. Showers will begin to
increase as moisture from an old front rides in with the weakening
trades. Breezy trade wind weather will return during the second
half of the week, with scattered showers focused over windward and
mauka areas and generally dry weather expected over most leeward
locations.

&&

.DISCUSSION...
High pressure north of the state is driving moderate to locally
breezy trade winds across local waters this evening. Afternoon
soundings show our airmass is quite dry and stable, with around an
inch of PW and positive lifted index values. Satellite imagery
shows scattered to patchy broken low clouds upstream from Maui
County and the Big Island which will likely spread scattered
light to moderate showers across those areas later tonight.

As the high north of the state begins to shift to our northeast
tonight, trades will gradually decrease through Tuesday. Winds may
briefly become light enough for sea breezes mid day Tuesday. As
the trades weaken, moisture from an old front will move in and
fuel increased showers over windward and mauka areas Monday night
through Tuesday night. Leeward areas could see a few passing
showers, mainly during the overnight and early morning hours.

A new high will build north of the state Wednesday, prompting a
return of locally breezy trades by Wednesday afternoon. Typical
summertime weather, with breezy trade winds and light to moderate
showers focused over windward and mauka areas, is expected through
the weekend.

&&

.AVIATION...
High pressure north of the state will generate persistent
moderate trades tonight. Thus, expect scattered shower development
mainly along the windward side of the islands. Periods of MVFR
conditions may occur due to lowered ceilings and visibility from
the aforementioned shower activity.

No AIRMETs are currently in effect.

&&

.MARINE...
High pressure north of the state is maintaining moderate to
locally breezy trade winds across the area. A Small Craft
Advisory is currently posted for the Alenuihaha Channel, and will
remain up through tonight. The high is forecast to move off to a
position far northeast of the area Monday, resulting in a slight
decrease in wind speeds. The high is then forecast to build back
in to our north Wednesday, with trade winds increasing once again.

Surf along south facing shores will remain slightly elevated
through Monday as a series of southerly swells move through the
area. A larger and longer period south swell is expected to fill
in Monday night, peak during the late Tuesday through Wednesday
time period, then lower gradually Thursday through Friday. A High
Surf Advisory will likely be needed along south facing shores of
all islands. A smaller long period south swell is expected to
arrive by the weekend.

A series of small north and northwest swells are on tap through
most of the week, keeping surf above summertime flatness levels.
With the expected decrease in trade winds across the area, surf
will remain on the small side along east facing shores until the
trades pick up during the second half of the week.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 AM HST Monday for Alenuihaha
Channel.

&&

DISCUSSION...Powell
AVIATION...JT
MARINE...Kinel