Current Conditions
Temp4.0 C
RH35 %
WindNE 14 mph
RoadOpen (4x4)
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Hawaiian Islands Synoptic Discussion and Guidance

FXHW60 PHFO 152010

Area Forecast Discussion
National Weather Service Honolulu HI
1010 AM HST Wed Jul 15 2020

Moderate trade winds today will become light Thursday and Friday
as a trough passes north of the state. Most showers will be
relegated to windward and mountain areas today and Thursday with
an increase expected Friday. Breezy trades are on tap over the
weekend with another batch of showers forecasted to move through


A high pressure ridge to the north will maintain moderate trade
winds through tonight before weakening Thursday. Gentle trade
winds with afternoon sea breezes are expected Thursday and Friday
with the ridge weakening and a surface trough passing north of the
islands. Both features will allow the pressure gradient to relax
over the state, and hence the lighter winds. The trough is
forecast to exit the area by Saturday, allowing the winds to ramp
up to breezy levels over the weekend and remain into next week.

Moisture from the aforementioned trough will infiltrate the
islands from east to west Thursday night and Friday with shower
coverage and humidity levels increasing. A drier period is
expected Saturday with increasing showers possible Sunday as
another area of enhanced moisture moves through.


VFR conditions prevail at most TAF sites with occasional MVFR Cigs
at some windward terminals. Brief period of MVFR can be expected
through the evening hours mainly over windward slopes.

No AIRMET's are currently in effect.


High pressure to the far northeast of the state will maintain a
moderate to locally fresh trade wind pattern into tonight. A weak
disturbance is forecast to move northeast of the islands Thursday
and Friday, which will help to weaken our winds a bit. Winds may
become light enough for afternoon sea breezes over select leeward
waters Thursday and Friday afternoons. Expect the trades to ramp
back up over the weekend as that disturbance dissipates and the
high pressure strengthens north of the state.

Overall, no significant swells are expected through the forecast
period. Small background surf will continue along south facing
shores over the next several days. A small south-southwest swell
is possible over the weekend. East facing shores will continue to
experience small to moderate short period surf produced by the
trade winds locally and upstream of the state. An increase is
expected over the weekend as the breezy trade winds return. Surf
along north facing shores will remain nearly flat through the






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