Hawaii Island Weather Update for April 27th, 2020

Notice Level: Normal (Information Update Requested)


Tropical Depression One-E (1st tropical cyclone of 2020) that formed in the eastern Pacific has dissipated into a remnant low and the National Hurricane Center (NHC) is no longer tracking this system.


Weather for Hawaii Island: Normal trade wind pattern will continue for the island through the week. Stronger trade winds are expected going into the weekend.

Published By: HIRSC Team - Weather Unit

info@hiradioscannercommunity.com


From the National Weather Service (NWS) - Honolulu Office

Synopsis

A stable trade wind pattern is expected through the week with trade winds gradually strengthening over the next few days. The best chance for showers will remain over windward and mountain areas, mainly through the overnight and early morning periods as pockets of moisture move through from east to west. Some leeward showers will be possible towards the second half of the week due to stronger trade winds.

Discussion

A ridge of high-pressure north of the state will produce a stable trade wind pattern through the week. The greatest chance for any showers will remain over windward and mauka areas, mainly during the overnight and early morning hours. As the trades strengthen and become locally windy around the middle of the week, a few isolated showers will be possible over leeward areas. Remnant moisture from a passing front well north of the state will bring a slight uptick in showers over Kauai Wednesday through Thursday morning. Rainfall accumulations should be light to moderate and mainly focused over windward and mauka areas. Other than this weak feature, typical breezy trade wind weather is expected through the weekend.

Aviation

No big changes expected today, with a stable, moderate to locally breezy trade wind flow through tonight. A fairly strong trade wind inversion is expected to hold between 5,000 to 7,000 ft. Isolated MVFR conditions will be confined to windward slopes, with VFR elsewhere. AIRMET TANGO remains in effect for moderate turbulence south thru west of all mountains below 8,000 feet. Winds are expected to be a bit stronger by this afternoon in comparison to last night, so there will be a slightly higher chance of low-level turbulence this afternoon.

Marine

A new area of high pressure is slowly building in far to the north northwest of the state. This will result in a gradual uptick in trade winds over the next couple of days. A Small Craft Advisory (SCA) is currently posted for the typically windy waters around Maui County and the Big Island. During the Wednesday through Friday time period, the high will be centered due north of the state. Trades are expected to increase a bit more, with SCA conditions possible across most of the area. Winds may even approach gale force in the Alenuihaha Channel. A small short period northwest swell will linger through Tuesday. A new north northwest swell, is expected to fill in late Tuesday and Tuesday night, peak on Wednesday, then lower gradually Thursday and Friday. Another small north northwest swell is expected over the weekend. Surf heights are expected to remain below advisory levels during each of these swells. There will be a series of small, mainly background southerly swells throughout the forecast period. Easterly trade winds will continue to produce short period choppy surf along east facing shores this week and on into the weekend. Surf heights will increase a bit later in the week due the expected uptick in trade wind speeds.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Sunday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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