Hilo, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

592
FXHW60 PHFO 271343
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
343 AM HST Fri Jun 27 2025

.SYNOPSIS...

Ridge of high pressure will persist north of the state maintaining
breezy trades. Occasional pockets of moisture embedded within the
trades will mainly focus clouds and showers over windward and
mauka areas for the next several days, especially overnight. Trade
wind speeds could decrease early next week as a weak front
approaches from the far northwest.

&&

.DISCUSSION...

A broad ridge of high pressure north of the main Hawaiian Islands
continues to drive locally breezy easterly trade winds across the
state. An upper jet continues to stream a thin layer of cirrus
across the state and should shift north through the day. This morning
satellite and radar imagery shows low level scattered clouds and
showers mainly focused along windward and mauka areas. Rain gauge
networks show that most locations have received very little or no
rainfall overnight, except for some windward and mauka locations
on Kauai. Observed 12Z soundings at Hilo and Lihue continues to
show strong inversions between roughly 6,500 and 7,500 feet, with
ample dry air aloft. The Kona slopes of the Big Island have
cleared out over and but will likely see afternoon sea- breezes
increases cloud and shower coverage.

Global forecast models remain in good agreement that the broad
ridge of high pressure north of the state will remain nearly
stationary through Saturday as it experiences minor fluctuations
in intensity. This will maintain moderate to breezy trade winds
across the main Hawaiian Islands into the weekend. Mid level
ridging will keep an overall dry and stable airmass over the
state, though pockets of low- level moisture trapped beneath the
inversion will result in occasional windward and mauka showers,
particularly during the overnight through early morning hours each
day.

During the second half of the weekend and into early next week,
the surface ridge will weaken and shift eastward as a front makes
its way across the North Pacific and a new high develops far
north- northwest of the state. As this occurs, trades will likely
weaken a bit more and veer to become more east- southeasterly
through mid-week. Showers are expected to be fairly limited
throughout this time, mainly favoring windward and mauka areas
during the overnight through early morning hours each day. The
western half of the state may have a better chance of showers due
to the proximity of the front and associated band of moisture.
The second half of next week could see a slight up tick in windward
and mauka showers as equatorial moisture is advected northward in
the low to mid levels from a weak inverted trough moving from east
to west across the state.


&&

.AVIATION...

AIRMET SIERRA has been issued for windward and mauka areas as
clouds and showers have increase early this morning producing some
MVFR conditions along windward and mauka areas. Conditions could
improve this afternoon. Elsewhere, VFR conditions continue under a
transparent shield of cirrus clouds.

AIRMET Tango remains in effect for low-level lee turb.



&&

.MARINE...

Moderate to locally strong trade winds expected for the next
couple of days. A Small Craft Advisory is in effect for the
typical windier waters and channels around Maui and the Big
Island through at least 6AM Saturday. Early next week a
disturbance passing to the north of the islands may slightly
weaken the trades.

The current south swell will continue to gradually fade to
background levels through the weekend. Models show another small,
long period south swell arriving Sunday into early next week that
should boost south shore surf up to near average surf.

Surf along east shores will remain rough and choppy for the next
several days. Surf along north facing shores will remain tiny
through the period.


&&

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


&&

$$


DISCUSSION...Almanza
AVIATION...Almanza
MARINE...Walsh