Sunrise 5:50 AM   Sunset 7:06 PM Moonrise 4:55 PM   Moonset 3:53 AM

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PHZ115 Oahu Leeward Waters- 948 Pm Hst Mon May 20 2024
Rest of tonight - East winds 10 to 15 knots. Seas 4 to 6 feet. Wave detail: east southeast 4 feet at 6 seconds and south 4 feet at 14 seconds. Isolated showers. Tuesday - East winds 10 to 15 knots. Seas 4 to 5 feet. Wave detail: east southeast 4 feet at 6 seconds and south 3 feet at 14 seconds. Isolated showers. Tuesday night - East winds to 10 knots. Seas 3 to 5 feet. Wave detail: east 4 feet at 7 seconds and south 3 feet at 13 seconds. Isolated showers. Wednesday - East winds 7 to 10 knots. Seas 3 to 4 feet. Wave detail: east 4 feet at 7 seconds. Isolated showers. Wednesday night - East winds 10 to 15 knots. Seas 3 to 4 feet. Wave detail: east 4 feet at 7 seconds. Scattered showers. Thursday - East winds 10 to 15 knots. Seas 3 to 5 feet. Wave detail: east 4 feet at 7 seconds. Isolated showers. Thursday night - East northeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east 4 feet at 7 seconds. Isolated showers. Friday - East northeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east 5 feet at 7 seconds. Isolated showers. Saturday - East northeast winds 15 to 20 knots, easing to 10 to 15 knots after midnight. Seas 4 to 5 feet. Wave detail: east 4 feet at 6 seconds. Isolated showers.

PHZ100 948 Pm Hst Mon May 20 2024
Synopsis for hawaiian coastal waters - A strong high far northeast of the state will produce fresh to locally strong trade winds over the eastern half of the state and moderate trades over the western half of the state through Tuesday.

FXHW60 PHFO 210642 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 842 PM HST Mon May 20 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 250 miles west-northwest of Kauai, while a 1036 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 mostly cloudy conditions in windward areas, and partly cloudy skies in most leeward locales. Radar imagery shows relatively dry conditions across the state, with a few showers moving into windward areas, and dwindling daytime heating showers in some leeward locales. 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 Tuesday 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 tonight into Tuesday morning, with light showers limited mainly to windward slopes and coasts. A band of moisture appears to move in from the east Tuesday 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 Tuesday afternoon.
Showers should diminish quickly over leeward areas Tuesday evening, with showers focusing over windward terrain Tuesday night 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. Brief periods with MVFR CIGs /VSBYs in clouds/showers are possible over windward areas overnight through the morning hours, then over leeward and interior locations Tuesday afternoon where localized sea breezes form.

AIRMET Sierra is in effect for mountain obscuration over the windward slopes of the Big Island, and will likely need to be expanded to Maui later this evening. This could continue into early Tuesday morning before conditions improve.

MARINE
An area of low pressure will linger west to northwest of the state through much of next week. This low pressure area will interact with a building high pressure system far northeast of the state. This weather pattern will produce fresh to locally strong easterly trade winds over the eastern waters and gentle to fresh east-southeast winds over western waters through Tuesday.
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. The SCA will likely continue for these eastern windier waters through early next week.

Surf along south-facing shores will continue to gradually decline over the next several days. Surf heights should continue to remain above the summer average (5 feet) through Tuesday then diminish by Wednesday. 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 7 AM HST Wednesday for Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

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Moku o Loe
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Tue -- 12:43 AM HST     0.84 feet High Tide
Tue -- 04:26 AM HST     Moonset
Tue -- 05:51 AM HST     Sunrise
Tue -- 06:45 AM HST     -0.02 feet Low Tide
Tue -- 01:57 PM HST     2.01 feet High Tide
Tue -- 05:48 PM HST     Moonrise
Tue -- 07:06 PM HST     Sunset
Tue -- 09:09 PM HST     0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Moku o Loe, Kaneohe Bay Oahu Island, Hawaii, Tide feet

Waikane
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Tue -- 12:20 AM HST     1.04 feet High Tide
Tue -- 04:26 AM HST     Moonset
Tue -- 05:50 AM HST     Sunrise
Tue -- 06:41 AM HST     -0.02 feet Low Tide
Tue -- 01:35 PM HST     2.21 feet High Tide
Tue -- 05:48 PM HST     Moonrise
Tue -- 07:05 PM HST     Sunset
Tue -- 09:05 PM HST     0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Waikane, Kaneohe Bay, Oahu Island, Hawaii, Tide feet

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