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Hawaiian Islands Synoptic Discussion and Guidance |
FXHW60 PHFO 250159
Area Forecast Discussion
National Weather Service Honolulu HI
359 PM HST Sun May 24 2020
Light east to east-southeast trade winds will continue through
Tuesday, with a few showers possible mainly during the afternoon
and evenings. A return of moderate trade winds are expected by
midweek as a ridge of high pressure strengthens north of the
Latest radar and satellite imagery are showing a few light to
moderate showers across the state this afternoon. For the most
part, the background trade wind flow was slightly stronger than
anticipated, which resulted in less afternoon convection across
the state. For tonight, we should see mostly clear weather as the
land breezes develop.
Looking ahead to Monday and Tuesday, we should see similar
weather pattern to today with background trade winds out of the
east to east-southeast direction. For the most part, mostly sunny
weather is expected, but a few afternoon showers will be
Starting Wednesday, high pressure building north of the state
should bring the return of moderate easterly trade winds. With a
stable atmosphere aloft, showers will mainly favor windward and
mauka areas during the overnight and early morning hours. This
stable trade wind pattern will likely continue through the next
High pressure sitting stagnant far northeast of the islands will
allow for mainly light easterly flow for the remainder of the day.
Isolated to scattered showers over the interior will diminish
this evening with the loss of diurnal heating. Expect mainly VFR
conditions tonight as weak flow and land breezes dominate.
No AIRMETs are in effect at this time.
A surface ridge 350 nm north of Kauai will drift southward during
the next couple of days, keeping moderate to fresh easterly trade
winds around the Big Island and Maui and gentle to moderate east-
southeast winds from Molokai to Kauai. Stronger high pressure will
develop far north of the state Wednesday, producing moderate to
fresh trade winds into next weekend.
South facing shores will see periods of surf around May average
through much of the week. A longer period south-southwest swell
will combine with a small south-southeast swell to produce
moderate sized surf near or just below May average through
Memorial Day, followed by a slight drop on Tuesday and Wednesday.
Another pulse of south-southwest swell is due late Thursday
A series of small northwest swells will produce surf near May
average along north facing shores through much of the week. The
small swell will shift out of the north Friday and Saturday.
Surf along east facing shores will be below May average through
the week as the trade winds over and upstream of the state remain
weaker than normal.
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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