textproduct: Honolulu

SYNOPSIS

A light land and sea breeze pattern will produce afternoon clouds and spotty showers over land and partial clearing at night. Trade winds will redevelop late Wednesday and strengthen Thursday and Friday focusing rainfall over windward and mauka areas.

DISCUSSION

No significant changes to the forecast with the morning package. Changes were confined to incorporate the latest National Blend of Model data to the forecast.

A trough to the west of the islands is helping to keep light winds over the region. Light winds over night resulted in land breezes that have helped to clear most of the skies over the islands. This afternoon we anticipate some afternoon sea breezes that will bring some clouds and showers to the interiors of the islands.

The trough is expected to dissipate over the next day, which will allow a surface ridge to set up north of the islands. This in turn will allow trade winds to build back over the region. A mid to upper ridge will limit shower activity for Thursday and Friday. Over the weekend, moisture currently upstream the islands will be carried in on the trade wind flow. This will bring a return to more typical trade wind showers over the weekend.

AVIATION

Land breezes this morning will become sea breezes today with cloud and shower buildups over interior areas. Northeasterly trade winds will then fill in by the evening. Once the trade winds return, showers will return to focusing over windward and mountain areas. VFR conditions will prevail with brief MVFR conditions any in showers.

No AIRMETs in effect.

MARINE

Light coastal land and sea breezes will prevail through the day and into early Thursday. Strengthening surface high pressure moving into far northwest offshore waters will bring a return to trade winds. Moderate to locally fresh trades will be the dominant wind from Thursday through the weekend.

A small, medium-period, west northwest (300-330) swell has leveled out this morning and will gradually decline the next few days. A small northwest swell reinforcement will fill in through the day.

A moderate, medium period north northeast swell is arriving this morning and will peak east-facing shore surf to advisory levels today. This swell will produce above average surf for select north and east facing shores before slowly declining through the remainder of the week. Strengthening trades later this week will support closer to seasonal average surf for east-facing shores this weekend.

West energy from former Super Typhoon Sinlaku is expected to come through the next couple of days. This swell may lift surf along better western exposures from today through the end of the week.

HFO WATCHES/WARNINGS/ADVISORIES

High Surf Advisory until 6 AM HST Thursday for Big Island East- Big Island North-Big Island Southeast-Kipahulu-Koolau Windward- Molokai Southeast-Molokai Windward-Olomana-Windward Haleakala.