Marine Weather and Tide Forecast for Hilo, HI

DISCUSSION
Stable June weather will persist through the week, with periods of locally breezy trade winds focusing showers over windward and mauka areas. Broad surface high pressure far north of the state will maintain trades near current strength through at least Tuesday. Winds will ease slightly on Wednesday as the high shifts to the northeast, followed by a likely increase again during the weekend as the high moves closer to the state. A mid-level ridge overhead will maintain stable conditions, and pockets of moisture in the trade wind flow will focus showers along windward areas, especially at night. A diffuse band of shallow moisture will pass over the islands late this afternoon through the evening and produce a boost in windward showers, with top sites likely receiving over a half inch of rain. Otherwise, no organized areas of moisture are noted for the next few days. Aside from a few passing showers tonight, leeward areas from Kauai to Maui will be rather dry, and the Kona slopes of the Big Island will continue to experience scattered showers each afternoon. High clouds over the area will dissipate tonight as an upper-level low to the west of Kauai is pushed away by a strengthening ridge aloft.

AVIATION
Stable, breezy trades deliver clouds and showers mainly to windward and mauka zones through the period. VFR prevails through today with patchy MVFR possible within any showers. A shower band lingering offshore threatens to bring more widespread MVFR potential tonight.

AIRMET Tango remains in effect for low-level lee turb.

AIRMET Sierra for mountain obscuration may be needed for select windward zones overnight.

MARINE
High pressure north of the state will drive trades through the rest of the week. A slight weakening trend in the winds is expected as the high moves eastward. A Small Craft Advisory (SCA)
for the windier waters and channels near Maui and the Big Island goes through 6 AM HST Wednesday with a likely extension.

A series of small, long-period, south swells will help boost surf heights along south facing shores though the week. The current south swell will decline through Tuesday followed by another small south swell from Wednesday into Thursday.

Rough and choppy surf along east facing shores will continue this week. Surf will remain nearly flat along north facing shores throughout the forecast period.

HFO WATCHES/WARNINGS/ADVISORIES
Small Craft Advisory until 6 AM HST Wednesday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.