NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
920
FXHW60 PHFO 240700
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
900 PM HST Thu May 23 2024
.SYNOPSIS...
A high pressure ridge north of the islands will keep moderate to
breezy easterly trade winds over the islands lasting into the
middle of next week. Clouds and showers will favor typical
windward and mountain areas, trending higher in the overnight to
early morning hours.
&&
.DISCUSSION...
Satellite imagery this evening shows high level cirrus clouds
spreading over the islands from west to east this evening. Fairly
stable low level clouds are drifting over the islands in the
moderate to breezy easterly trade winds. High level cirrus clouds
may enhance sunrise and sunset colors over the next few days.
Trade wind speeds will peak on Friday as the high pressure ridge
builds slightly, and then decrease this weekend as the pressure
gradient weakens a bit. Trade winds will drive these clouds up
over windward island mountains into the middle of next week. Brief
periods of showers remain in the forecast mainly over these
windward and mountain areas, trending higher in the overnight to
early morning hours. Drier leeward areas will see less clouds and
only isolated showers due to the subsidence caused by the trade
winds immediately downstream of the windward mountain ranges.
Only subtle changes are expected in the day to day weather
forecast for each island in a fairly stable trade wind weather
pattern. The highest chances for clouds and showers statewide will
continue to be over eastern Maui near Hana, and over the eastern
slopes of the Big Island along the Hamakua Coast to Hilo to the
Volcano.
&&
.AVIATION...
Moderate to breezy easterly trade winds will persist
across the Hawaiian Islands into the weekend. Isolated to
scattered showers will favor windward coasts and slopes, with
greater coverage expected during the overnight hours. Brief MVFR
conditions are possible in moderate showers. Otherwise, VFR
conditions will prevail.
AIRMET Sierra for mountain obscuration is in effect for windward
areas of Maui and Oahu, and for all of Kauai this evening.
Conditions may improve overnight, then an uptick in windward
showers tomorrow morning may require AIRMET Sierra for more
mountain obscuration across windward portions of some of the
Hawaiian Islands.
&&
.MARINE...
High pressure will gradually build westward well to the north of
the state tonight and Friday, strengthening the trade winds into
the fresh to strong range across the island chain. A Small Craft
Advisory (SCA) is now in effect for most waters around Maui
County and the Big Island as well as the northwest Kauai waters
through 6 AM Saturday. For the windiest waters around Maui and
the Big Island the SCA extends through 6 PM Saturday. A trough of
low pressure will amplify and linger west of the islands this
weekend into early next week, resulting in a slight easing of the
trades and a shift to a more east- southeasterly direction over
the western end of the state. Moderate to strong easterly trades
will prevail over the eastern waters.
South shore surf will remain small and below the summer average
through the middle of next week, with only small and inconsistent
pulses of southwest swell expected. The next significant south-
southwest swell (200 deg) appears to move in toward the end of
next week. East shore surf will remain near the seasonal average
through Friday, followed by a slight decrease this weekend through
the middle of next week as the trades ease over and upstream of
the islands. Surf along north shores will remain very small with a
slight bump possible late Sunday through Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 AM HST Saturday for Kauai Northwest
Waters-Kaiwi Channel-Maui County Windward Waters.
Small Craft Advisory until 6 PM HST Saturday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
Small Craft Advisory until 6 AM HST Friday for Big Island
Windward Waters.
&&
$$
DISCUSSION...Bohlin
AVIATION...Powell
MARINE...Jelsema
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
920
FXHW60 PHFO 240700
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
900 PM HST Thu May 23 2024
.SYNOPSIS...
A high pressure ridge north of the islands will keep moderate to
breezy easterly trade winds over the islands lasting into the
middle of next week. Clouds and showers will favor typical
windward and mountain areas, trending higher in the overnight to
early morning hours.
&&
.DISCUSSION...
Satellite imagery this evening shows high level cirrus clouds
spreading over the islands from west to east this evening. Fairly
stable low level clouds are drifting over the islands in the
moderate to breezy easterly trade winds. High level cirrus clouds
may enhance sunrise and sunset colors over the next few days.
Trade wind speeds will peak on Friday as the high pressure ridge
builds slightly, and then decrease this weekend as the pressure
gradient weakens a bit. Trade winds will drive these clouds up
over windward island mountains into the middle of next week. Brief
periods of showers remain in the forecast mainly over these
windward and mountain areas, trending higher in the overnight to
early morning hours. Drier leeward areas will see less clouds and
only isolated showers due to the subsidence caused by the trade
winds immediately downstream of the windward mountain ranges.
Only subtle changes are expected in the day to day weather
forecast for each island in a fairly stable trade wind weather
pattern. The highest chances for clouds and showers statewide will
continue to be over eastern Maui near Hana, and over the eastern
slopes of the Big Island along the Hamakua Coast to Hilo to the
Volcano.
&&
.AVIATION...
Moderate to breezy easterly trade winds will persist
across the Hawaiian Islands into the weekend. Isolated to
scattered showers will favor windward coasts and slopes, with
greater coverage expected during the overnight hours. Brief MVFR
conditions are possible in moderate showers. Otherwise, VFR
conditions will prevail.
AIRMET Sierra for mountain obscuration is in effect for windward
areas of Maui and Oahu, and for all of Kauai this evening.
Conditions may improve overnight, then an uptick in windward
showers tomorrow morning may require AIRMET Sierra for more
mountain obscuration across windward portions of some of the
Hawaiian Islands.
&&
.MARINE...
High pressure will gradually build westward well to the north of
the state tonight and Friday, strengthening the trade winds into
the fresh to strong range across the island chain. A Small Craft
Advisory (SCA) is now in effect for most waters around Maui
County and the Big Island as well as the northwest Kauai waters
through 6 AM Saturday. For the windiest waters around Maui and
the Big Island the SCA extends through 6 PM Saturday. A trough of
low pressure will amplify and linger west of the islands this
weekend into early next week, resulting in a slight easing of the
trades and a shift to a more east- southeasterly direction over
the western end of the state. Moderate to strong easterly trades
will prevail over the eastern waters.
South shore surf will remain small and below the summer average
through the middle of next week, with only small and inconsistent
pulses of southwest swell expected. The next significant south-
southwest swell (200 deg) appears to move in toward the end of
next week. East shore surf will remain near the seasonal average
through Friday, followed by a slight decrease this weekend through
the middle of next week as the trades ease over and upstream of
the islands. Surf along north shores will remain very small with a
slight bump possible late Sunday through Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 AM HST Saturday for Kauai Northwest
Waters-Kaiwi Channel-Maui County Windward Waters.
Small Craft Advisory until 6 PM HST Saturday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
Small Craft Advisory until 6 AM HST Friday for Big Island
Windward Waters.
&&
$$
DISCUSSION...Bohlin
AVIATION...Powell
MARINE...Jelsema
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office