NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
530
FXHW60 PHFO 192007
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
1007 AM HST Fri Apr 19 2024
.SYNOPSIS...
Breezy trades will briefly weaken over the weekend, before
increasing again early next 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 that. Winds will hover near the advisory levels through
Saturday before trending downward.
High pressure far to the north-northwest of the state will
drift to the east, with an associated ridge remaining north of
the region. This will maintain a general trade wind pattern into
the middle to end of next week. The breezy trades will hold today,
then ease into the light to moderate range over the weekend as
the ridge to the north weakens due to a low passing far to the
north. The southern extent of a mid- to upper-level trough
associated with this low will pass near the islands to the north
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 high to
the north will support relatively dry conditions with breezy
easterly trades through the majority of next week. Expect clouds
and limited showers to ride in on the trade wind flow from time to
time, remaining focused over the typical windward sides of the
islands and concentrated during the overnight and morning hours.
Clouds and limited showers are also expected over the west slopes
of the Big Island each day, mainly during the afternoon and
evening hours.
&&
.AVIATION...
Moderate trade winds will remain in place today and gradually
weaken this evening through the weekend. A band of low clouds and
SHRA will continue bringing MVFR conds to the windward and mauka
locations of the islands.
AIRMET Sierra for mtn obsc remains in effect for Kauai, Oahu,
Molokai, and Maui. This may need cancelled this afternoon as conds
improve.
&&
.MARINE...
A low pressure system passing far to the north of the state will
weaken the subtropical ridge of high pressure. This will result
in a slight weakening of the trade winds across the coastal and
offshore waters. A Small Craft Advisory in effect for the usually
windier zones around Maui County and the Big Island is on track to
be dropped by 6 PM HST today. The ridge of high pressure should
rebuild early next week, which should produce fresh to locally
strong trades once again.
Along the south-facing shores, moderate surf will decline slowly
into the weekend. For the north-facing shores, a small, short-
period north swell should continue into Saturday. A moderate,
medium-period north swell is expected to arrive on Saturday
night. Surf along east-facing shores will remain small through the
weekend and may increase slightly early next week as the trades
strengthen.
&&
.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...TS
AVIATION...Walsh
MARINE...Kodama
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
530
FXHW60 PHFO 192007
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
1007 AM HST Fri Apr 19 2024
.SYNOPSIS...
Breezy trades will briefly weaken over the weekend, before
increasing again early next 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 that. Winds will hover near the advisory levels through
Saturday before trending downward.
High pressure far to the north-northwest of the state will
drift to the east, with an associated ridge remaining north of
the region. This will maintain a general trade wind pattern into
the middle to end of next week. The breezy trades will hold today,
then ease into the light to moderate range over the weekend as
the ridge to the north weakens due to a low passing far to the
north. The southern extent of a mid- to upper-level trough
associated with this low will pass near the islands to the north
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 high to
the north will support relatively dry conditions with breezy
easterly trades through the majority of next week. Expect clouds
and limited showers to ride in on the trade wind flow from time to
time, remaining focused over the typical windward sides of the
islands and concentrated during the overnight and morning hours.
Clouds and limited showers are also expected over the west slopes
of the Big Island each day, mainly during the afternoon and
evening hours.
&&
.AVIATION...
Moderate trade winds will remain in place today and gradually
weaken this evening through the weekend. A band of low clouds and
SHRA will continue bringing MVFR conds to the windward and mauka
locations of the islands.
AIRMET Sierra for mtn obsc remains in effect for Kauai, Oahu,
Molokai, and Maui. This may need cancelled this afternoon as conds
improve.
&&
.MARINE...
A low pressure system passing far to the north of the state will
weaken the subtropical ridge of high pressure. This will result
in a slight weakening of the trade winds across the coastal and
offshore waters. A Small Craft Advisory in effect for the usually
windier zones around Maui County and the Big Island is on track to
be dropped by 6 PM HST today. The ridge of high pressure should
rebuild early next week, which should produce fresh to locally
strong trades once again.
Along the south-facing shores, moderate surf will decline slowly
into the weekend. For the north-facing shores, a small, short-
period north swell should continue into Saturday. A moderate,
medium-period north swell is expected to arrive on Saturday
night. Surf along east-facing shores will remain small through the
weekend and may increase slightly early next week as the trades
strengthen.
&&
.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...TS
AVIATION...Walsh
MARINE...Kodama
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office