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Hawaiian Islands Synoptic Discussion and Guidance

FXHW60 PHFO 131959

Area Forecast Discussion
National Weather Service Honolulu HI
959 AM HST Tue Apr 13 2021

High pressure northwest of the state and a building ridge aloft
will produce stable northeasterly trade winds today through
Thursday, with showers favoring typical windward slopes. An
increase in showers and a decrease in winds is possible Friday and
Saturday. Moderate to locally breezy easterly trades may return by


High pressure far northwest of the state will continue to produce
moderate northeast trades and fair weather conditions over the
next several days. Rainfall totals are expected to remain light,
with some scattered showers over windward areas from time to time.

Trade winds are expected to weaken slightly towards the end of the
week with light northeast winds expected on Friday. Moisture from
a weakening front is expected to move through Friday into
Saturday and will likely bring an increase of showers. Once
again, most of these showers will be focused over windward and
mountain areas. By Sunday we are expecting moderate to locally
breezy easterly trades to return as high pressure builds far
northeast of the state.


Light to moderate trades will persist today. Isolated to
scattered showers may occur along the windward sides of the
islands and bring brief periods of MVFR ceilings and visibility.
Otherwise, dry weather and mainly clear skies expected elsewhere.

No AIRMETs are currently in effect.


The forecast remains consistent from previous discussion.
Northeast trade winds will strengthen through tomorrow as a high
far northwest of the area moves east. Wind speeds are expected to
exceed the Small Craft Advisory threshold through tomorrow night
in the windy areas around the Big Island and Maui. Winds will
subside later in the week as a cold front approaches from the
north. Northeast trade winds will return over the weekend.

The current northwest swell is forecast to slowly subside through
Thursday. A larger, but shorter-period north swell arriving
Thursday night will persist through the weekend, then slowly
subside next week. Surf from these swells along north and west
facing shores will remain well below the advisory thresholds.

Surf will remain small along east facing shores through mid-week.
The north swell will wrap around to some east facing shores later
in the week. Swells from distant southern hemisphere storms will
produce moderate surf along south facing shores today, with small
surf continuing through the rest of the week.


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




Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office

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It was last modified on: Wed, Dec 17 2014 - 1841 UTC
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