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Hawaiian Islands Synoptic Discussion and Guidance |
FXHW60 PHFO 090158
Area Forecast Discussion
National Weather Service Honolulu HI
358 PM HST Sat Aug 8 2020
Strong trade winds will prevail through the weekend, then
gradually trend down through the middle of next week as high
pressure to the northeast weakens. Passing trade wind showers
will favor windward and mountain areas each day, especially
during the overnight and early morning periods as pockets of
moisture move through.
A 1034 mb high located far north-northeast of the state will
produce strong trades through Sunday. Trade winds are expected to
gradually decrease beginning Sunday night and lower to moderate
speeds (10 to 20 mph) by Wednesday.
This afternoon's radar and satellite imagery are showing a few
isolated showers over windward and mauka areas. Looking upstream
of the state, a batch of cumulus clouds are approaching the state
and will likely bring an increase of shower coverage tonight. As
far as precipitation over the next week, we will continue to see
our typical trade wind showers where showers will be focused over
windward and mauka areas especially during the night time and
early morning hours. No significant weather impacts are expected
during the next 7 days.
Fresh to locally strong trades will support scattered showers
with periods of MVFR particularly over windward coasts and slopes.
The ENE flow characteristic of today has allowed mtn obscuration
to be particularly persistent over Oahu and Big Island while
Molokai and Maui have been largely free of lower ceilings.
However, the latest satellite and ground observations support
dropping AIRMET SIERRA for all except Big Island. Slightly drier
trades work into the area late Sunday morning.
AIRMET TANGO remains in effect below 8000 feet over and
immediately south thru west of mountains for tempo moderate
AIRMET SIERRA remains in effect above 2500 for the Big Island.
A strong high pressure system far to the north northeast will keep
strong winds across the coastal waters. A Small Craft Advisory
(SCA) is in effect to include the typical windy areas around Maui
County and the Big Island, plus Maui Windward Waters, the Kaiwi
Channel and Oahu Leeward Waters through Sunday afternoon. Winds
are expected to trend down early next week as the high weakens,
which should once again bring SCA coverage to the typical windy
Surf along south facing shores is expected to return to background
levels tonight, but a small, long period south southwest swell
may bump surf up slightly Sunday into early next week. Surf along
east facing shores will become rough as trade winds strengthen,
but is expected to remain below the advisory levels. A small
northwest swell will arrive during the second half of the week.
Small Craft Advisory until 6 PM HST Monday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
Small Craft Advisory until 6 PM HST Sunday for Oahu Leeward
Waters-Kaiwi Channel-Maui County Windward Waters.
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office
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It was last modified on: Wed, Dec 17 2014 - 1841 UTC
Send comments to: Ryan Lyman