NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
175
FXHW60 PHFO 200647
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
847 PM HST Fri Apr 19 2024
.SYNOPSIS...
Moderate trade winds are forecast through the weekend with
enhanced showers decreasing from west to east through the day on
Saturday. Dry trade wind weather will continue on Sunday with wind
speeds starting to pick up slightly by Sunday night as a high
pressure system builds north of the islands. Brief periods of
showers will pass through the islands through early next week in a
moderate to breezy trade wind pattern. Wednesday will be on the
wet side for most islands, especially in the overnight to early
morning hours.
&&
.DISCUSSION...
Strong winds aloft enhanced by a passing upper level trough will
continue to support High Wind Warning conditions for the highest
Big Island summits of Mauna Kea and Mauna Loa through Saturday
afternoon. Winds at summit level will decrease quickly by
Saturday evening as the upper trough passes east of the Big
Island.
Satellite imagery this evening shows a sharp upper trough
approaching the islands from the northwest. This upper trough
will help to enhance trade wind showers through Saturday morning.
An upper ridge will build in behind this trough as it passes from
west to east across the state on Saturday, increasing stability
and decreasing cloud and shower coverage. Sunday will be the most
favorable weather day of the weekend for outdoor activities.
From Sunday night into Tuesday, a weak high pressure system will
build just north of the Hawaiian islands. Fair weather remains in
the forecast for most areas with a slight increase in our trade
winds from moderate into the moderate to breezy range should be
expected. One wrinkle in this forecast, no surprise to the
locals, is the Hilo side of the Big Island and portions of East
Maui will continue to see periods of enhanced showers.
From Tuesday night into Thursday morning, a band of unstable
clouds will move from northeast to southwest across all islands.
Expect increasing shower trends, favoring windward and mountain
areas especially in the overnight to early morning hours.
Thursday onward, typical trade wind weather will continue for the
rest of the week with brief windward and mountain showers
possible.
&&
.AVIATION...
Light to moderate trade winds will persist through forty-eight
hours and beyond. Bands of low clouds and light showers off the
Pacific will impact mainly windward slopes and coasts. Isolated
spillover showers are likely over leeward slopes of the smaller
islands, especially in the late night and morning hours.
AIRMET Sierra for mountain obscuration is currently in effect for
windward portions of all islands. Conditions are expected to
improve shortly after sunrise.
&&
.MARINE...
High pressure building in from the north-northwest will drift east
and keep trade winds moderate to fresh through the weekend. The
ridge of high pressure should rebuild early next week, which
should produce fresh to locally strong trade winds once again.
The current south swell will decline into the weekend. A series
of small, medium period swells will persist through the weekend
keeping south facing shores from going flat. Small, short- period
north swell will continue into into the weekend. A larger moderate
medium period north swell reinforcement will arrive late Saturday
night. Surf along east facing shores will remain small but can
expect a slight increase early next week as the trades
strengthen.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
High Wind Warning until 6 PM HST Saturday for Big Island Summits.
&&
$$
DISCUSSION...Bohlin
AVIATION...Bedal
MARINE...Shigesato
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office
Narrow the Menu List
Select Time Limit: 12 hours | 24 hours | 48 hours | 72 hours | No time limit
Select Product Type: All | Routine Bulletins/FCSTS | Warnings/Watches/Advisories | HAWN Weather | Tropical | Marine | Aviation | Daily Obs | Special
Hawaiian Islands Synoptic Discussion and Guidance
175
FXHW60 PHFO 200647
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
847 PM HST Fri Apr 19 2024
.SYNOPSIS...
Moderate trade winds are forecast through the weekend with
enhanced showers decreasing from west to east through the day on
Saturday. Dry trade wind weather will continue on Sunday with wind
speeds starting to pick up slightly by Sunday night as a high
pressure system builds north of the islands. Brief periods of
showers will pass through the islands through early next week in a
moderate to breezy trade wind pattern. Wednesday will be on the
wet side for most islands, especially in the overnight to early
morning hours.
&&
.DISCUSSION...
Strong winds aloft enhanced by a passing upper level trough will
continue to support High Wind Warning conditions for the highest
Big Island summits of Mauna Kea and Mauna Loa through Saturday
afternoon. Winds at summit level will decrease quickly by
Saturday evening as the upper trough passes east of the Big
Island.
Satellite imagery this evening shows a sharp upper trough
approaching the islands from the northwest. This upper trough
will help to enhance trade wind showers through Saturday morning.
An upper ridge will build in behind this trough as it passes from
west to east across the state on Saturday, increasing stability
and decreasing cloud and shower coverage. Sunday will be the most
favorable weather day of the weekend for outdoor activities.
From Sunday night into Tuesday, a weak high pressure system will
build just north of the Hawaiian islands. Fair weather remains in
the forecast for most areas with a slight increase in our trade
winds from moderate into the moderate to breezy range should be
expected. One wrinkle in this forecast, no surprise to the
locals, is the Hilo side of the Big Island and portions of East
Maui will continue to see periods of enhanced showers.
From Tuesday night into Thursday morning, a band of unstable
clouds will move from northeast to southwest across all islands.
Expect increasing shower trends, favoring windward and mountain
areas especially in the overnight to early morning hours.
Thursday onward, typical trade wind weather will continue for the
rest of the week with brief windward and mountain showers
possible.
&&
.AVIATION...
Light to moderate trade winds will persist through forty-eight
hours and beyond. Bands of low clouds and light showers off the
Pacific will impact mainly windward slopes and coasts. Isolated
spillover showers are likely over leeward slopes of the smaller
islands, especially in the late night and morning hours.
AIRMET Sierra for mountain obscuration is currently in effect for
windward portions of all islands. Conditions are expected to
improve shortly after sunrise.
&&
.MARINE...
High pressure building in from the north-northwest will drift east
and keep trade winds moderate to fresh through the weekend. The
ridge of high pressure should rebuild early next week, which
should produce fresh to locally strong trade winds once again.
The current south swell will decline into the weekend. A series
of small, medium period swells will persist through the weekend
keeping south facing shores from going flat. Small, short- period
north swell will continue into into the weekend. A larger moderate
medium period north swell reinforcement will arrive late Saturday
night. Surf along east facing shores will remain small but can
expect a slight increase early next week as the trades
strengthen.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
High Wind Warning until 6 PM HST Saturday for Big Island Summits.
&&
$$
DISCUSSION...Bohlin
AVIATION...Bedal
MARINE...Shigesato
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office