000
FXHW60 PHFO 240655
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
855 PM HST Tue Apr 23 2024

.SYNOPSIS...
Breezy trade winds will continue through Friday. Expect enhanced
trade wind showers through Thursday morning as a band of unsettled
clouds moves through the islands. These showers will mainly form over
windward and mountain slopes, favoring the overnight to early
morning hours. Trade wind speeds will decrease slightly this
weekend as high pressure weakens to the north and a low pressure
system deepens far northwest of the island chain.

&&

.DISCUSSION...
The satellite imagery this evening shows a long band of unstable
clouds embedded in the trade wind flow, creeping towards Hawaii
from the east. This unstable cloud band will produce periods of
showers mainly over windward and mountain areas, favoring the
overnight to early morning hours. These enhanced showers will
likely continue through Thursday morning.

In the big picture, a high pressure system will continue to linger
1000 miles northeast of the island chain through Friday,
producing breezy trade winds across the Hawaii region. This high
center will drift farther east on Saturday decreasing trade wind
speeds as a cut off low pressure system deepens approximately 1000
miles northwest of Kauai. The cut off low at this time remains
too far northwest of the islands to impact island weather. Expect
wind speeds to decrease to more moderate trade wind levels from
Saturday to Sunday. Weekend weather appears fairly dry and sunny,
another great weekend for outdoor activities.

&&

.AVIATION...
Breezy to locally strong trade winds will prevail for the next
couple of days as a surface ridge remains to the north of the
islands. Cloud bands with SHRA are expected to move in tonight
into tomorrow, bringing MVFR conds to windward and mauka areas.

AIRMET Sierra for mtn obsc over windward areas is expected later
this evening into tomorrow morning with the increased moisture.

AIRMET Tango is in effect for moderate low level turb downwind of
the terrain for all islands.

&&

.MARINE...
High pressure northeast of the state will meander around 150W
while strengthening slightly over the next several days, driving
strong to locally near gale trades. The high is forecast to weaken
around Sunday as a deep low develops northwest of the area. A
Small Craft Advisory remains in effect for all Hawaiian coastal
waters through Wednesday night covering all Hawaiian coastal
waters.

Surf heights along all shores will remain below advisory thresholds
through the weekend. A small, medium period northwest swell
will arrive late Wednesday and continue through Saturday. Choppy,
rough surf expected all week along east facing shores due to the
trade winds. South facing shores will continue to see small
background swell pulses through rest of the the week.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 AM HST Thursday for all Hawaiian
waters-

&&

$$

DISCUSSION...Bohlin
AVIATION...SMW
MARINE...Almanza