Sunrise 5:50 AM   Sunset 6:44 PM Moonrise 12:00 AM   Moonset 10:31 AM

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PHZ122 Big Island Windward Waters- 917 Am Hst Mon Apr 29 2024
Rest of today - East winds 15 to 20 knots. Seas to 6 feet. Wave detail: east 5 feet at 8 seconds. Isolated showers. Tonight - East winds 15 to 20 knots. Seas 5 to 6 feet. Wave detail: east 4 feet at 8 seconds. Scattered showers. Tuesday - East winds 15 to 20 knots. Seas 5 to 6 feet. Wave detail: east 4 feet at 8 seconds. Scattered showers, mainly in the morning. Tuesday night - East winds to 15 knots. Seas 5 to 6 feet. Wave detail: east 4 feet at 9 seconds. Scattered showers. Wednesday - East winds 15 to 20 knots. Seas 5 to 6 feet. Wave detail: east 5 feet at 9 seconds. Scattered showers, mainly in the morning. Wednesday night - East winds 15 to 20 knots. Seas 5 to 6 feet. Wave detail: east 5 feet at 9 seconds. Isolated showers in the evening, then scattered showers after midnight. Thursday - East winds 15 to 20 knots. Seas 5 to 6 feet. Wave detail: east 5 feet at 8 seconds. Scattered showers in the morning, then isolated showers through the night. Scattered showers after midnight. Friday - East winds 15 to 20 knots. Seas 6 to 7 feet. Wave detail: east 5 feet at 8 seconds. Scattered showers in the morning, then isolated showers through the night. Scattered showers after midnight.

PHZ100 917 Am Hst Mon Apr 29 2024
Synopsis for hawaiian coastal waters - High pressure far northeast of the state will continue to slide east while a dissipating front passes north of the islands. By mid-week, high pressure will rebuild and fresh to locally strong trade winds will return.

FXHW60 PHFO 291958 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 958 AM HST Mon Apr 29 2024

SYNOPSIS
Moderate trades will prevail over the eastern islands through the first half of the work week, while lighter trades over the western islands allow for some leeward land and sea breezes.
Relatively dry weather will persist through Tuesday, with a few showers affecting windward areas overnight into the early morning hours and developing over interior and leeward areas each afternoon. The trades will rebound Tuesday night and Wednesday, bringing a transition over to more typical trade wind weather. The trades will become breezy Thursday through next weekend, and the trade wind showers may increase as well due to a disturbance aloft moving over the islands over the weekend.

DISCUSSION
This morning's satellite imagery is showing a band of high cirrus clouds across the smaller islands with scattered low level cumulus across many windward areas. For rest of today, we will continue to see a hybrid wind pattern with light to moderate trades with localized sea breezes developing during the day. Sea breezes should develop in many leeward areas, which will likely lead to afternoon clouds over leeward and interior areas and scattered showers. Any showers that do develop during the afternoon, should taper off in the evening. Otherwise, a similar weather pattern is expected on Tuesday, with mostly dry conditions in the morning and scattered light showers in the afternoon.

The trades should begin to strengthen on Wednesday and by Thursday, we should see breezy trades across the state. For Thursday and Friday, we should see our typical breezy trade wind weather with scattered showers over windward and mountain areas and isolated showers over leeward areas from time to time.

Over the weekend, latest model guidance is showing an upper level low approaching the state from the west, which will lead to unstable conditions. At the surface, we should continue to see high pressure centered far north of the state generating breezy trade winds. With breezy trades at the surface and unstable conditions aloft, we will likely see enhanced trade wind showers.
The details are still very uncertain due to models having a difficult time handling the evolution of upper level lows.
Nonetheless, we will likely see increased shower activity especially around Sunday or Monday of next week.



AVIATION
Light to moderate ESE winds with localized sea and land breezes will continue through tomorrow. Showers will focus over southeastern slopes but overall coverage should be limited due to a relatively dry airmass. VFR conditions will prevail for the most part.

High clouds will continue to stream across the Hawaiian Islands today as an upper level jet streak moves from west to east. An AIRMET Tango for tempo moderate turbulence is in effect between FL300 and FL380 and will likely remain through the day.

Otherwise, with the lighter ESE flow, afternoon sea breeze activity is expected across wind- sheltered areas, with some inland/leeward cloud buildups and a few light showers possible.
However, the high clouds may inhibit heating over land, and therefore limit sea breeze activity.



MARINE
High pressure far northeast of the state will continue to slide east while a dissipating front passes north of the islands. Trade winds have eased, and the Small Craft Advisory (SCA) was cancelled for all zones this morning. By mid-week, however, high pressure will rebuild to the northeast and usher in the return of fresh to locally strong trade winds. The SCA will likely go back up for the typical windy waters around Maui County and the Big Island Wednesday or Thursday.

North facing shores will remain small through the week with tiny to small background energy. Surf along east facing shores will decline through Tuesday then rebuild Thursday and Friday with the trade winds. A small long period south-southwest pulse will fill in through the day, peak Tuesday and ease Wednesday for south facing shores. Surf heights along the south facing shores should remain near or slightly below seasonal norms.



HFO WATCHES/WARNINGS/ADVISORIES
None.

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