NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
013
FXHW60 PHFO 121310
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
310 AM HST Mon May 12 2025
.SYNOPSIS...
High pressure far the northeast will drive breezy trade winds
with mainly windward and mauka showers. A weak upper low moving
across the state could increase shower coverage and intensity
through the weekend.
&&
.DISCUSSION...
Currently, satellite imagery shows some low clouds moving in on
the trades bringing in some showers to windward and mauka
locations which can be seen on radar. Bottom line is we are under
a fairly typical trade wind pattern through the forecast period.
A high pressure far to the northeast of the islands is moving
slowly east northeast. That will continue to produce moderate to
locally breezy trades across the state through mid-week. Windward
and mauka showers can be expected overnight and early morning each
day. Some spillover to leeward areas is possible but coverage is
expected to be isolated in nature. Trades may ease up slightly by
the latter half of the week as a few fronts move north of the
islands. Another disturbance should impact the islands over the
weekend and could increase showers.
&&
.AVIATION...
Bands of clouds riding in on the trade winds will bring periods
of windward and mountain showers with brief MVFR conditions,
favoring the overnight to early morning hours. These periods of
showers will continue through at least Tuesday.
AIRMET Tango remains in effect for moderate low level turbulence
immediately S through W of island mountains.
&&
.MARINE...
Fresh to locally strong trade winds will persist through much of
the week as as an area of high pressure remains far northeast of
the state. A Small Craft Advisory (SCA) remains in effect for most
Hawaiian waters as a result, through late this afternoon.
However, the high is expected to slowly drift the east, which will
allow the trades to weaken slightly tonight through mid-week.
Therefore, the SCA has been scaled back this evening through
Tuesday evening to the more typical windy waters near Maui and the
Big Island. This SCA will likely be extended through mid to late
week.
The current moderate period south-southwest swell will bring
elevated surf to south facing shores today, then slowly decline
through mid-week. By the end of the week, only small background
south swell will exist.
Surf along east-facing shores will be rough and choppy today due
to the stronger trade winds. Rough and choppy surf will persist
throughout the week with a slight decrease in surf heights as the
trades ease slightly tonight through mid-week.
A series of small northwest swells will keep small surf in place
along north facing shores through next weekend.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST this evening for Kauai
Northwest Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward
Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward
Waters-Maui County Leeward Waters.
Small Craft Advisory until 6 PM HST Tuesday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...Bohlin/Walsh
AVIATION...Bohlin
MARINE...Thomas
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
013
FXHW60 PHFO 121310
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
310 AM HST Mon May 12 2025
.SYNOPSIS...
High pressure far the northeast will drive breezy trade winds
with mainly windward and mauka showers. A weak upper low moving
across the state could increase shower coverage and intensity
through the weekend.
&&
.DISCUSSION...
Currently, satellite imagery shows some low clouds moving in on
the trades bringing in some showers to windward and mauka
locations which can be seen on radar. Bottom line is we are under
a fairly typical trade wind pattern through the forecast period.
A high pressure far to the northeast of the islands is moving
slowly east northeast. That will continue to produce moderate to
locally breezy trades across the state through mid-week. Windward
and mauka showers can be expected overnight and early morning each
day. Some spillover to leeward areas is possible but coverage is
expected to be isolated in nature. Trades may ease up slightly by
the latter half of the week as a few fronts move north of the
islands. Another disturbance should impact the islands over the
weekend and could increase showers.
&&
.AVIATION...
Bands of clouds riding in on the trade winds will bring periods
of windward and mountain showers with brief MVFR conditions,
favoring the overnight to early morning hours. These periods of
showers will continue through at least Tuesday.
AIRMET Tango remains in effect for moderate low level turbulence
immediately S through W of island mountains.
&&
.MARINE...
Fresh to locally strong trade winds will persist through much of
the week as as an area of high pressure remains far northeast of
the state. A Small Craft Advisory (SCA) remains in effect for most
Hawaiian waters as a result, through late this afternoon.
However, the high is expected to slowly drift the east, which will
allow the trades to weaken slightly tonight through mid-week.
Therefore, the SCA has been scaled back this evening through
Tuesday evening to the more typical windy waters near Maui and the
Big Island. This SCA will likely be extended through mid to late
week.
The current moderate period south-southwest swell will bring
elevated surf to south facing shores today, then slowly decline
through mid-week. By the end of the week, only small background
south swell will exist.
Surf along east-facing shores will be rough and choppy today due
to the stronger trade winds. Rough and choppy surf will persist
throughout the week with a slight decrease in surf heights as the
trades ease slightly tonight through mid-week.
A series of small northwest swells will keep small surf in place
along north facing shores through next weekend.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST this evening for Kauai
Northwest Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward
Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward
Waters-Maui County Leeward Waters.
Small Craft Advisory until 6 PM HST Tuesday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...Bohlin/Walsh
AVIATION...Bohlin
MARINE...Thomas
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office