NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
689
FXHW60 PHFO 191359
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
359 AM HST Fri Apr 19 2024
.SYNOPSIS...
A breezy trades will briefly weaken over the weekend, before
increasing again early in the new week. Mostly dry conditions will
prevail, with clouds and brief showers favoring windward and
mauka locations, mainly during the overnight through early morning
hours, as areas of moisture move through periodically.
&&
.DISCUSSION...
No changes to the forecast this morning, however the Big Island
summit winds are near Wind Advisory criteria so keeping a close
eye on the winds there. Winds will hover near the advisory
criteria into Saturday before trending downward.
High pressure far to the north-northwest of the state will
drift to the east, with a ridge of high pressure remaining north
of the region. This will maintain a trade wind pattern into the
middle to end of next week.
Expect a return to a drier trade wind pattern to become
established within the next 24 hours or so. Mid and upper level
ridging will help to maintain that drier trade wind pattern into
next week. Clouds and showers will be riding in on the trade wind
flow, and remain focused over the typical windward sides of the
islands. Those showers will be concentrated during the overnight
and morning hours. Clouds and limited showers are also expected
over the west slopes of the Big Island mainly during the afternoon
and evening hours.
The breezy trades will hold today, and then ease into the light
to moderate range over the weekend as the ridge to the north
weakens to a low passing far to the north. The southern extent of
a mid- to upper- level trough associated with this system will
pass near the islands to the north late today and into the
weekend, which could support a slight increase in windward shower
coverage during the overnight/early mornings. Rising upper heights
along with a strengthening surface ridge to the north will
support dry conditions prevailing early next week with breezy
easterly trades returning.
&&
.AVIATION...
Moderate trade winds will remain in place today then will weaken
gradually later this evening into the weekend. A band of low
clouds and showers will continue bringing MVFR clouds and showers
to the windward portions of the islands with improving conditions
expected by mid morning. Trade wind showers could then increase
again by this evening.
AIRMET Sierra for tempo mountain obscuration remains in effect
for Kauai, Oahu, Molokai, and Maui and will likely be cancelled
later this morning as showers are expected to decrease in
coverage.
&&
.MARINE...
A series of surface highs will build and pass north of the state
through early next week. Moderate to locally strong trades will
persist today, then weaken slightly over the weekend. A Small
Craft Advisory (SCA) is in effect until 6 PM HST today for the
typical windy zones around Maui County and the Big Island. Trades
will become fresh to locally strong again early next week.
Moderate surf along south facing shores will decline slightly
today. 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 early Sunday. Surf along east facing shores will
remain small but can expect a minor boost as winds pick up Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST this evening for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...M Ballard
AVIATION...Tsamous
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
689
FXHW60 PHFO 191359
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
359 AM HST Fri Apr 19 2024
.SYNOPSIS...
A breezy trades will briefly weaken over the weekend, before
increasing again early in the new week. Mostly dry conditions will
prevail, with clouds and brief showers favoring windward and
mauka locations, mainly during the overnight through early morning
hours, as areas of moisture move through periodically.
&&
.DISCUSSION...
No changes to the forecast this morning, however the Big Island
summit winds are near Wind Advisory criteria so keeping a close
eye on the winds there. Winds will hover near the advisory
criteria into Saturday before trending downward.
High pressure far to the north-northwest of the state will
drift to the east, with a ridge of high pressure remaining north
of the region. This will maintain a trade wind pattern into the
middle to end of next week.
Expect a return to a drier trade wind pattern to become
established within the next 24 hours or so. Mid and upper level
ridging will help to maintain that drier trade wind pattern into
next week. Clouds and showers will be riding in on the trade wind
flow, and remain focused over the typical windward sides of the
islands. Those showers will be concentrated during the overnight
and morning hours. Clouds and limited showers are also expected
over the west slopes of the Big Island mainly during the afternoon
and evening hours.
The breezy trades will hold today, and then ease into the light
to moderate range over the weekend as the ridge to the north
weakens to a low passing far to the north. The southern extent of
a mid- to upper- level trough associated with this system will
pass near the islands to the north late today and into the
weekend, which could support a slight increase in windward shower
coverage during the overnight/early mornings. Rising upper heights
along with a strengthening surface ridge to the north will
support dry conditions prevailing early next week with breezy
easterly trades returning.
&&
.AVIATION...
Moderate trade winds will remain in place today then will weaken
gradually later this evening into the weekend. A band of low
clouds and showers will continue bringing MVFR clouds and showers
to the windward portions of the islands with improving conditions
expected by mid morning. Trade wind showers could then increase
again by this evening.
AIRMET Sierra for tempo mountain obscuration remains in effect
for Kauai, Oahu, Molokai, and Maui and will likely be cancelled
later this morning as showers are expected to decrease in
coverage.
&&
.MARINE...
A series of surface highs will build and pass north of the state
through early next week. Moderate to locally strong trades will
persist today, then weaken slightly over the weekend. A Small
Craft Advisory (SCA) is in effect until 6 PM HST today for the
typical windy zones around Maui County and the Big Island. Trades
will become fresh to locally strong again early next week.
Moderate surf along south facing shores will decline slightly
today. 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 early Sunday. Surf along east facing shores will
remain small but can expect a minor boost as winds pick up Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST this evening for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...M Ballard
AVIATION...Tsamous
MARINE...Shigesato
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office