Sunrise 5:58 AM   Sunset 6:57 PM Moonrise 12:41 AM   Moonset 11:41 AM

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PHZ116 Kaiwi Channel- 916 Am Hst Tue Apr 30 2024
Rest of today - East southeast winds 15 to 20 knots, easing to 10 to 15 knots this afternoon. Seas 4 to 5 feet. Wave detail: east 5 feet at 6 seconds. Isolated showers. Tonight - East southeast winds 10 to 15 knots, becoming east 15 to 20 knots after midnight. Seas 4 to 5 feet. Wave detail: east 5 feet at 6 seconds. Isolated showers. Wednesday - East winds 15 to 20 knots. Seas 3 to 5 feet. Wave detail: east 5 feet at 6 seconds. Isolated showers. Wednesday night - East winds 15 to 20 knots. Seas 4 to 6 feet. Wave detail: east 5 feet at 6 seconds. Isolated showers. Thursday - East northeast winds 15 to 20 knots. Seas 4 to 6 feet. Wave detail: east 6 feet at 6 seconds. Isolated showers. Thursday night - East northeast winds to 20 knots. Seas 5 to 7 feet. Wave detail: east 7 feet at 7 seconds. Isolated showers. Friday - East northeast winds 20 to 25 knots. Seas 5 to 8 feet. Wave detail: east northeast 7 feet at 7 seconds. Isolated showers. Saturday - East northeast winds 20 to 25 knots. Seas 5 to 8 feet. Wave detail: east northeast 7 feet at 7 seconds and northwest 3 feet at 14 seconds. Isolated showers.

PHZ100 916 Am Hst Tue Apr 30 2024
Synopsis for hawaiian coastal waters - High pressure far northeast of the state will strengthen. A weak trough to the northwest of the state will gradually weaken. Trade winds will strengthen to moderate to locally strong tonight and persist through the remainder of the week.

FXHW60 PHFO 301923 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 923 AM HST Tue Apr 30 2024

SYNOPSIS
Moderate east to east-southeasterly winds will gradually strengthen on Wednesday, while areas of thin high clouds move across the region. Limited showers will be focused over windward areas, while afternoon clouds and a few showers form over sheltered leeward terrain each afternoon. Trade winds will strengthen on Thursday and will become breezy and gusty Friday through early next week. Rainfall will favor typical windward slopes, with an increase in showers possible Saturday through Monday as a disturbance aloft passes overhead.

DISCUSSION
Hawaii remains under a stable east to east-southeast trade wind flow, as a weak trough about 300 miles northwest of Kauai bisects a pair of high pressure cells to the distant northeast and northwest. Under this flow, expect modest rainfall over windward slopes, and sheltered leeward areas will experience increased clouds and a few showers this afternoon, mainly over the terrain.
Mid-level ridging will maintain stable conditions with an inversion around 6,000 to 7,00 feet, and with no distinct areas of moisture moving in on the trade wind flow, rainfall will remain rather modest, generally under a quarter of an inch per day in the wetter windward areas. In the upper levels, light westerly flow aloft will lead to brief thinning of high clouds from west to east today.

Trade winds will gradually strengthen and become more easterly Wednesday and Thursday, as the trough to the northwest fills and surface high pressure consolidates to the north. Winds will likely be weak enough for some leeward sea breezes Wednesday afternoon, but aside from typical showers on the South Kona slopes of the Big Island, chances for leeward rainfall will be minimal. Continued westerly flow aloft may bring some patches of thin high clouds.

A 1030 mb surface high will settle far north of the state late Thursday and Friday, driving breezy and gusty trade winds and mainly windward rainfall into early next week. A compact upper- level low lingering west of the state Thursday and Friday will eventually move overhead during the weekend and could enhance shower activity sometime Saturday into Monday.

AVIATION
Hawaii remains wedged between surface high pressure far northeast of the state and a trough to the northwest. This pattern will maintain light to moderate east to east-southeasterly flow today.
Expect scattered showers along the windward portions of the islands and isolated showers elsewhere. Brief periods of MVFR ceilings and visibility may occur with this activity, though not expecting anything widespread. Sea breezes are forecast to develop along portions of the leeward coasts by early afternoon, resulting in some cloud buildups over leeward terrain and island interiors.
Land breezes should once again clear out those areas overnight.

No AIRMETs are currently in effect, nor expected through the afternoon.

MARINE
High pressure far northeast of the state will strengthen and expand through the remainder of the week. A weak trough has stalled to the northwest of the state and is expected to gradually weaken over the next two to three days. In response, moderate to fresh east-southeast trade winds today will strengthen to moderate to locally strong by tomorrow afternoon. A Small Craft Advisory (SCA) will likely initially be issued for the typical windy waters around the Big Island and Maui sometime tonight and may be expanded to include additional waters Friday or Saturday.

Tiny surf will persist along north facing shores through Friday, with a small pulse of northwest swell swell expected this weekend. A small long period south-southwest swell will peak today, then ease on Wednesday. Otherwise, small background level surf on south shores for the rest of the week. Choppy surf along east facing shores will decline over the next twenty-four hours, then gradually increase as trade winds rebuild. Rough east shore surf will likely rise above seasonal average Friday into the weekend.

HFO WATCHES/WARNINGS/ADVISORIES
None.

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