Marine Weather and Tide Forecast for Haiku-Pauwela, HI

DISCUSSION
This evening's satellite and radar imagery show isolated showers riding into windward areas on the trades. These showers have been mainly producing light rainfall amounts and are expected to decrease as the evening rolls on. Winds will likely become light enough to allow land breezes to develop and help to clear out interior and leeward clouds and showers overnight, especially over the smaller islands. A little pocket of moisture can be seen on satellite roughly 80 miles east of the Big Island, which could bring another round of some light showers to windward portions of the eastern end of the state late tonight into tomorrow morning.
Otherwise, mostly dry conditions are expected tonight with a few light showers possible over windward and mountain areas.

Light to moderate easterly trade winds will persist over the eastern half of the state, and light east-southeast over the western half will maintain a hybrid trade wind/sea breeze pattern through the rest of the work week. This pattern will allow for clouds and a few showers to move into windward areas on the trades and afternoon sea breezes to bring cloud build ups with a few light showers over select leeward areas.

Aloft, mid-level ridging will build over the state from the west through the weekend, increasing stability and suppressing shower activity. Some pockets of low level moisture will move in from time to time, but any shower activity should remain brief and light in intensity. Over the weekend, a front passing to the north will weaken the surface ridge over the state and produce lighter southeast winds across the region. With these lighter winds, land and sea breeze development will become more prevalent. As such, partial clearing can be expected overnight along with cloud build ups over leeward and interior areas in the afternoons, with the occasional light shower.

Yet another front will approach from the northwest early next week and may move across the western end of the state and increase the chance of showers as it dissipates across the area.

AVIATION
A surface ridge will move to a position just N of Kauai overnight. This will lead to light SE winds over Kauai and Oahu, and light to moderate E winds over Maui and Hawaii Counties, which will deliver low clouds and limited showers to windward slopes, producing ISOL MVFR CIGs . Land and sea breezes will be likely over sheltered leeward areas, leading to clearing at night and some afternoon clouds over leeward and interior areas. VFR conditions will prevail, and windward cloud coverage is not expected to become sufficiently extensive to warrant an AIRMET for mountain obscuration.

MARINE
A ridge of high pressure will become more established north of the state through the remainder of this week and help generate generate light to moderate east southeast flow across the local waters.

A large, medium to long period, west-northwest (300-320) swell will affect the local waters tonight into Wednesday, followed by a reinforcing west northwest swell of similar size on Thursday.
Near shore buoy reports at at Hanalei and Waimea Bay continue to indicate a 7-8 foot, medium period, west northwest swell, which is responsible for the elevated surf conditions. Thus, a High Surf Advisory (HSA) will remain in effect along exposed north and west facing beaches of most islands through 6 PM HST Wednesday.
Thursday's swell will be of similar size and likely produce advisory level surf for the same areas. Surf heights may briefly fall slightly below advisory criteria between the two aforementioned swells.

Small surf is expected along east facing shores Wednesday as trades remain light to moderate. A slight increase is possible through the rest of the week as east southeast flow become more established. Surf along south facing shores should see a small boost on Wednesday as a small south swell fills in through the second half of the week.

A Small Craft Advisory (SCA) for hazardous seas for waters exposed to these large swells is in effect through 6 AM HST Wednesday.
Significant wave heights should slowly fall below advisory levels (10 ft) thereafter.

HFO WATCHES/WARNINGS/ADVISORIES
High Surf Advisory until 6 PM HST Wednesday for Niihau-Kauai Leeward-Waianae Coast-Oahu North Shore-Maui Windward West-Kona- Kohala-Kauai North-Molokai Windward-Molokai North-Molokai West- Windward Haleakala-Big Island South.

Small Craft Advisory until 6 AM HST Wednesday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters- Kauai Channel-Oahu Windward Waters-Kaiwi Channel-Maui County Windward Waters.