Waimea, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

349
FXHW60 PHFO 120130
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
330 PM HST Mon Aug 11 2025

.SYNOPSIS...
Gentle to moderate trades will build back tonight, but warm and
muggy conditions continue. A low level trough will bring an
increase in clouds and showers Wednesday night into Thursday
night, followed by trades building by the end of the week.

&&

.DISCUSSION...
Winds are currently light and variable with sea breezes producing
low clouds across leeward sides of the islands. A few heavier
showers have flared over the Big Island interior, but otherwise
shower activity has been light today. With Hurricane Henriette
moving away, high pressure will fill in from the east and begin to
boost trade winds through the night. Expect a return to drier and
more stable conditions with gentle to moderate trades over the
next couple of days and clouds and light showers focused
windward. Dew points will maintain around 70 degrees across the
state Tuesday with a little bit of a decrease into the upper 60s
by Wednesday making it still feel fairly warm even with the trades
back.

By late Wednesday, latest model guidance depicts a low-level
trough that propagates westward into the state. Temperature
inversions across much of the state increase to near 8,000 feet
during this time, increasing cloud cover and shower trends across
the state, favoring windward and mountain areas of all islands.
This quick-moving trough continues westward and exits on the west
side of the islands by late Thursday.

Thereafter, as the weekend approaches, trades strengthen back to
moderate to locally breezy and a more typical summer-like trade
wind weather pattern will once again prevail.


&&

.AVIATION...
Light winds will continue across the island chain through tonight
and then trades will gradually begin to return tomorrow. This
lighter flow allowed for sea breezes to develop again this
afternoon, bringing clouds and isolated showers over leeward and
interior areas. Winds should remain light enough tonight,
particularly along leeward areas, to see land breezes develop
once again, helping to clear out inland cloud cover. As the
trades return tomorrow, clouds and showers will primarily be
focused over windward areas. VFR conditions will generally
prevail.

No AIRMETs are currently in effect.

&&

.MARINE...
A weak ridge axis extending south from parent high pressure over
the N Pacific is becoming established over the islands today.
This signals a return to a moderate trade wind pattern through
mid-week. A weak trough axis then advances westward across the
state resulting in a brief period of light easterlies which may be
variable at times on Thursday. Locally fresh trades then builds
across area waters Friday into the weekend.

PacIOOS buoys at Barber`s Point and Kaumalapau (Lanai) indicate
rather steady significant wave heights through today. However,
energy in the longer periods has nonetheless begun to fall off and
is indicative of surf having fallen below the advisory threshold
this afternoon. The High Surf Advisory has therefore been
cancelled. This swell will gradually subside through the week. S
shores then get a modest bump this weekend in response to a small
long period pulse emanating from the S Hemisphere.

Surf along E shores remains small for the next several days as
building trades remain on the lighter side. Short period chop
increases this weekend as stronger trades develop. Surf along N
and W shores remains tiny.

&&

.FIRE WEATHER...
Critical fire weather thresholds are not expect over the next
couple of days as winds will remain light to moderate with
dewpoint values near or above 70 degrees for some areas. Some
instability will linger around the the Big Island upper slopes
through the rest of the week as inversion heights fluctuate
between 5-8 kft with pockets of deep moisture moving through.
Drier and more stable conditions will gradually return late this
week into the weekend.

&&

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

&&

$$


DISCUSSION...Foster
AVIATION...Farris
MARINE...JVC
FIRE WEATHER...Foster