NWS Bulletins for NPAC - MKWC
Menu of Text Products for the Hawaiian Islands and the Tropical Pacific/Atlantic Oceans:
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
952
FXHW60 PHFO 211302
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
302 AM HST Tue May 21 2024
.SYNOPSIS...
Moderate to locally breezy trades will hold over the eastern
islands during the next couple days, while lighter trades allow
for some localized land and sea breezes over the western end of
the state. Showers will favor windward and mauka areas overnight
and during the morning hours, with a few showers developing over
interior and leeward sections each afternoon and evening. A more
typical moderate to breezy trade wind pattern will overspread the
state Wednesday night or Thursday and linger through early next
week, with showers favoring windward and mauka areas, along with
the occasional leeward spillover.
&&
.DISCUSSION...
Currently at the surface, a trough of low pressure is located
around 300 miles west-northwest of Kauai, while a 1035 mb high is
centered around 1600 miles north-northeast of Honolulu. Moderate
to locally breezy trade winds prevail over the eastern islands,
while light to moderate trades remain over the western end of the
state. Infrared satellite imagery shows a mix of high and low
clouds bringing mostly cloudy conditions to the state this
morning. Radar imagery shows relatively dry conditions across the
state, with only a few showers moving into windward areas. Main
short term focus revolves around rain chances and trade wind
trends during the next couple days.
The trough to the west-northwest of the state will gradually
shift westward and further away from the islands during the next
couple days. This will allow the trade winds to gradually
strengthen from east to west across the islands, with moderate to
breezy conditions expected statewide by Thursday. The gradient
will likely be light enough today and Wednesday, to allow some
localized leeward sea breezes in the most sheltered areas over
Kauai and Oahu. A series of reinforcing highs will build north of
the state Friday through early next week, while the trough
continues to shift further west and away from the area. This will
maintain moderate to breezy trade winds across the island chain.
As for the remaining weather details, fairly dry conditions should
prevail this morning, with light showers limited mainly to
windward slopes and coasts. A band of moisture appears to move in
from the east this afternoon, bringing an increase in trade wind
showers to the eastern end of the state. Additionally, a few
leeward and interior showers will be possible over the western
islands and leeward Big Island during the afternoon. Showers
should diminish quickly over leeward areas this evening, with
showers focusing over windward terrain tonight into Wednesday
morning. Localized sea breezes may then allow for some leeward
shower development again Wednesday afternoon. Beginning Wednesday
night or Thursday, we should see a transition over to a more
typical trade wind pattern featuring mainly windward/mauka showers
and the occasional leeward spillover, with showers most prevalent
in the overnight and early morning hours. This pattern should
hold through early next week.
&&
.AVIATION...
Light to moderate east to southeast winds will persist through
the 24-Hr forecast period. Despite the lack of windward showers,
MVFR CIGs associated with a stable low cloud deck will remain
possible through the early morning hours over the eastern end of
the state. A few leeward showers are possible this afternoon where
localized sea breezes form. Otherwise, VFR conditions will
prevail.
AIRMET Sierra is in effect for mountain obscuration over the
windward slopes of the Big Island and Maui. Conditions should
improve through the mid- to late-morning hours.
&&
.MARINE...
An area of low pressure west to northwest of the state will slowly
drift westward away from the islands through much of this week.
High pressure will slowly build into the Hawaii region with a
slight strengthening of easterly trade winds as this low pressure
trough moves away from the state. Expect fresh to locally strong
easterly trade winds over the eastern waters and gentle to fresh
east-southeast winds over western waters today. Easterly trade
winds will strengthen over the western waters from Thursday
onward. A Small Craft Advisory (SCA) remains in effect for the
windier coastal waters around Maui County and the Big Island
through Wednesday. The SCA will likely continue for some of these
eastern windier waters through the end of the week.
Surf along south-facing shores will continue to gradually decline
over the next few days. Only small long period background south
swell pulses are expected from Tasman Sea sources over the next
seven days. Surf along east facing shores should see a gradual
rise over the next few days as the trades strengthen upstream of
the state. Surf heights along north and west facing shores will
remain small with a slight bump up from Sunday into Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST Wednesday for Maui County
Windward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel-
Big Island Windward Waters-Big Island Leeward Waters-Big Island
Southeast Waters.
&&
$$
DISCUSSION...Jelsema
AVIATION...Gibbs
MARINE...Bohlin
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
952
FXHW60 PHFO 211302
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
302 AM HST Tue May 21 2024
.SYNOPSIS...
Moderate to locally breezy trades will hold over the eastern
islands during the next couple days, while lighter trades allow
for some localized land and sea breezes over the western end of
the state. Showers will favor windward and mauka areas overnight
and during the morning hours, with a few showers developing over
interior and leeward sections each afternoon and evening. A more
typical moderate to breezy trade wind pattern will overspread the
state Wednesday night or Thursday and linger through early next
week, with showers favoring windward and mauka areas, along with
the occasional leeward spillover.
&&
.DISCUSSION...
Currently at the surface, a trough of low pressure is located
around 300 miles west-northwest of Kauai, while a 1035 mb high is
centered around 1600 miles north-northeast of Honolulu. Moderate
to locally breezy trade winds prevail over the eastern islands,
while light to moderate trades remain over the western end of the
state. Infrared satellite imagery shows a mix of high and low
clouds bringing mostly cloudy conditions to the state this
morning. Radar imagery shows relatively dry conditions across the
state, with only a few showers moving into windward areas. Main
short term focus revolves around rain chances and trade wind
trends during the next couple days.
The trough to the west-northwest of the state will gradually
shift westward and further away from the islands during the next
couple days. This will allow the trade winds to gradually
strengthen from east to west across the islands, with moderate to
breezy conditions expected statewide by Thursday. The gradient
will likely be light enough today and Wednesday, to allow some
localized leeward sea breezes in the most sheltered areas over
Kauai and Oahu. A series of reinforcing highs will build north of
the state Friday through early next week, while the trough
continues to shift further west and away from the area. This will
maintain moderate to breezy trade winds across the island chain.
As for the remaining weather details, fairly dry conditions should
prevail this morning, with light showers limited mainly to
windward slopes and coasts. A band of moisture appears to move in
from the east this afternoon, bringing an increase in trade wind
showers to the eastern end of the state. Additionally, a few
leeward and interior showers will be possible over the western
islands and leeward Big Island during the afternoon. Showers
should diminish quickly over leeward areas this evening, with
showers focusing over windward terrain tonight into Wednesday
morning. Localized sea breezes may then allow for some leeward
shower development again Wednesday afternoon. Beginning Wednesday
night or Thursday, we should see a transition over to a more
typical trade wind pattern featuring mainly windward/mauka showers
and the occasional leeward spillover, with showers most prevalent
in the overnight and early morning hours. This pattern should
hold through early next week.
&&
.AVIATION...
Light to moderate east to southeast winds will persist through
the 24-Hr forecast period. Despite the lack of windward showers,
MVFR CIGs associated with a stable low cloud deck will remain
possible through the early morning hours over the eastern end of
the state. A few leeward showers are possible this afternoon where
localized sea breezes form. Otherwise, VFR conditions will
prevail.
AIRMET Sierra is in effect for mountain obscuration over the
windward slopes of the Big Island and Maui. Conditions should
improve through the mid- to late-morning hours.
&&
.MARINE...
An area of low pressure west to northwest of the state will slowly
drift westward away from the islands through much of this week.
High pressure will slowly build into the Hawaii region with a
slight strengthening of easterly trade winds as this low pressure
trough moves away from the state. Expect fresh to locally strong
easterly trade winds over the eastern waters and gentle to fresh
east-southeast winds over western waters today. Easterly trade
winds will strengthen over the western waters from Thursday
onward. A Small Craft Advisory (SCA) remains in effect for the
windier coastal waters around Maui County and the Big Island
through Wednesday. The SCA will likely continue for some of these
eastern windier waters through the end of the week.
Surf along south-facing shores will continue to gradually decline
over the next few days. Only small long period background south
swell pulses are expected from Tasman Sea sources over the next
seven days. Surf along east facing shores should see a gradual
rise over the next few days as the trades strengthen upstream of
the state. Surf heights along north and west facing shores will
remain small with a slight bump up from Sunday into Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST Wednesday for Maui County
Windward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel-
Big Island Windward Waters-Big Island Leeward Waters-Big Island
Southeast Waters.
&&
$$
DISCUSSION...Jelsema
AVIATION...Gibbs
MARINE...Bohlin
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office