Current Conditions
Temp4.4 C
RH59 %
WindNNE 28 mph
RoadOpen (4x4)
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Hawaiian Islands Synoptic Discussion and Guidance

FXHW60 PHFO 082000

Area Forecast Discussion
National Weather Service Honolulu HI
1000 AM HST Sat Aug 8 2020

Strong trade winds will prevail through the weekend, then
gradually trend down through the middle of next week as high
pressure to the northeast weakens. Clouds and showers will favor
windward and mountain areas each day, especially through the
overnight and early morning periods as pockets of moisture move
through. Windward shower coverage may decrease later in the
weekend and into early next week some drier air moves into the


High pressure north-northeast of the state will strengthen today
and will result in increasing trade winds across the state. Strong
trade winds are expected to persist through the weekend and
gradually decrease through the middle of next week. Trades should
return to the 10 to 20 mph range by the middle of next week.

Latest radar and satellite imagery are showing light scattered
showers over windward and mauka areas this morning. We should see
showers decrease through the afternoon for most areas followed by
an increase overnight as another batch of cumulus clouds move
through the state. The one exception is the leeward areas of the
Big Island where clouds and showers are expected to develop this
afternoon. Sounding from Hilo is showing above normal precipitable
water values, which could lead to some brief downpours near the
upper slopes of Kona this afternoon. Overall, typical trade wind
weather is expected through the middle of next week. Showers will
primarily be focused over windward and mauka areas especially
during the mornings and overnight hours.


Locally strong trades will support scattered showers with periods
of MVFR particularly over windward coasts and slopes. Latest
surface observations and satellite trends this morning support
continuing AIRMET SIERRA for Oahu and Big Island. Elsewhere, cloud
coverage has diminished and ceilings have risen firmly into VFR
range for the time being. Persistent trades are also expected to
support lee turbulence through the forecast period.

AIRMET TANGO remains in effect below 8000 feet over and
immediately south thru west of mountains for tempo moderate

AIRMET SIERRA remains in effect above 2500 for Oahu, Lanai, and
Big Island.


High pressure to the north-northeast is expected to strengthen
this weekend, which will boost trade winds across the coastal
waters. The Small Craft Advisory (SCA) has been expanded to
include the Maui Windward Waters, the Kaiwi Channel and Oahu
Leeward Waters through Sunday afternoon. Winds are expected to
trend down early next week, which should once again bring the SCA
level winds to the typical areas near Maui County and the Big

Surf along south facing shores is expected to return to
background levels today and remain below summer average into next
week. Small short period southeast swell will continue, with the
Big Island blocking some of that energy from reaching the smaller
islands. Surf along east facing shores will build through the
weekend as trade winds strengthen, but is expected to remain below
the advisory levels. A small north-northwest swell will provide a
bit of energy to the north facing shores, keeping surf just above
flat through Saturday.


Small Craft Advisory until 6 PM HST Sunday for Oahu Leeward
Waters-Kaiwi Channel-Maui County Windward Waters-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