|Wind||NNE 18 mph|
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Hawaiian Islands Synoptic Discussion and Guidance |
FXHW60 PHFO 070159
Area Forecast Discussion
National Weather Service Honolulu HI
359 PM HST Mon Jul 6 2020
Trade winds will gradually strengthen over the next few days and
will remain breezy through the weekend. Showers will continue to
be focused over the windward slopes especially during the nights
and early morning hours, and over leeward portions of the Big
Island during the afternoons. A slight increase in trade wind
showers are possible Wednesday and Thursday.
High pressure building north of the state will bring a gradual
increase of trade winds during the next 48 hours. The current
moderate trade winds are expected to become breezy by late
Tuesday then persist through the rest of the week. Latest model
guidance is showing a slight increase of trades towards the end of
the week into the weekend, which could bring locally windy trades
across the windier areas around Maui County and the Big Island.
As far as precipitation, the trade winds will focus passing
showers over windward and mauka areas with a few isolated showers
making its way over to leeward areas from time to time. A slight
uptick in moisture will bring subtle increases of trade wind
showers on Wednesday and Thursday. Typical breezy trade wind
weather is expected for this weekend.
High pressure far to the north of the state will keep moderate
trade wind flow in place through twenty-four hours. Ragged clouds
and isolated showers will continue to impact mainly north and
east facing slopes and coasts. Shower activity is expected to
increase after midnight due to nocturnal cloud top cooling.
No AIRMETs in effect or anticipated at this time. Mountain
obscuration could become an issue late tonight or Tuesday morning
across windward portions of Kauai and the Big Island. Otherwise, VFR
conditions are expected to prevail all areas with the exception
of brief MVFR CIG or VIS in showers.
Moderate to fresh range trade winds are expected to ramp up to
fresh to strong speeds tonight and Tuesday. Therefore, a Small
Craft Advisory (SCA) has been issued for the windier waters around
Maui County and the Big Island through Wednesday afternoon. The
SCA will likely need to be extended in time and expanded to
additional marine areas as the trades continue to increase though
Surf along south facing shores will remain small through the week,
with mainly a mix of small south and south-southeast energy. A
slightly larger south swell arriving late Wednesday may bump up
surf heights Thursday. Surf along east facing shores will rise
slowly this week as the trades increase locally and upstream of
the islands. Surf along north facing shores will remain small
through the upcoming week.
Small Craft Advisory until 6 PM HST Wednesday 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