Saturday, February27, 2021
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Marine Weather and Tides
Olowalu, HI

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:45AMSunset 6:30PM Saturday February 27, 2021 4:59 PM HST (02:59 UTC) Moonrise 7:19PMMoonset 7:22AM Illumination 98% Phase: Waning Gibbous; Moon at 16 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PHZ119 Maalaea Bay- 337 Pm Hst Sat Feb 27 2021
.small craft advisory in effect through Tuesday afternoon...
Tonight..North winds to 30 knots. Wind waves 4 feet. Isolated showers.
Sunday..North winds to 30 knots. Wind waves 4 feet. Isolated showers through the day.
Sunday night..North winds to 30 knots. Wind waves 4 feet. Isolated showers in the evening.
Monday..North winds to 30 knots. Wind waves 4 feet.
Monday night..North winds to 30 knots. Wind waves 4 feet.
Tuesday..North winds to 30 knots. Wind waves 4 feet. Isolated showers in the morning.
Tuesday night..North winds to 25 knots. Wind waves 4 feet.
Wednesday..North winds 20 knots. Wind waves 3 feet. Isolated showers.
Thursday..North winds 20 knots. Wind waves 3 feet. Isolated showers.
PHZ100 337 Pm Hst Sat Feb 27 2021
Synopsis for hawaiian coastal waters.. Strong trades with fully developed rough seas as large high pressure northeast of the islands produces a tight pressure gradient back across the islands.


7 Day Forecast for Marine Location Near Olowalu, HI
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location: 20.75, -156.64     debug


Area Discussion for -
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FXHW60 PHFO 280224 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 424 PM HST Sat Feb 27 2021

SYNOPSIS. Trade winds will strengthen on Sunday, with locally windy conditions expected to persist for the next several days, while a trough aloft keeps the island atmosphere unstable. While fast-moving heavy showers will focus over windward areas, the strong trades will also push a few showers leeward. Increased moisture near Maui and the Big Island will bring a more widespread threat of heavy windward showers, and a slight chance of thunderstorms.

DISCUSSION. Wet and windy trade wind weather is expected for at least the next couple of days as a strong surface high builds N of the islands, and a trough aloft lingers overhead. Some decrease in wind speed is anticipated by the middle of the upcoming week, but the trough aloft will be slow to depart.

Previously strong high pressure to the NE is in the process of rapidly weakening, but a new strong high will build N of the islands tonight and Sunday. In response, trade winds will strengthen Sunday and Sunday night, with windy conditions persisting into Tuesday, likely requiring a Wind Advisory for parts of the state. A large low pressure system is expected to develop in the NE Pacific by mid- week, shunting the high center to a position NW of the islands, leading to a weaker NE trade wind flow for the second half of the week.

A trough aloft is significantly destabilizing the island atmosphere, and moisture arriving on the trade wind flow is becoming enhanced to the point that thunderstorms have been observed over parts of Maui and the Big Island today. Heavy showers moving rapidly along with the trade winds have been strafing windward portions of all islands before drifting leeward and weakening. At times, orographic lift is leading to the production of persistent terrain-anchored rainfall as the unstable air is forced up the windward slopes by the strong trades, mainly on Maui and the Big Island, where a Flash Flood Watch remains in effect. Little overall change is expected through Sunday, with shower frequency potentially increasing due to the increased winds.

GFS guidance indicates that some decrease in moisture may lead to a reduction in trade showers starting Monday, while also indicating that the trough aloft will still be overhead. With this destabilizing feature remaining in place, we are somewhat reluctant to anticipate a significant drying trend, and instead think that windward showers will remain fairly active. This is supported by latest ECMWF guidance, which indicates another low aloft moving toward the islands from the NE.

The cold temperatures aloft and deeper-than-normal moisture means that the Big Island Summits will receive periods of wintry weather, with the primary threats being freezing rain leading to icy roadways, although snow showers will mix in as well. A Winter Weather Advisory remains in effect through Monday morning, and may need to be extended as the trough aloft lingers.

AVIATION. Widespread shower activity along with MVFR level clouds and visibility (brief IFR at times) will continue along north through east sections of most islands through tonight and much of Sunday as well, especially Maui and the Big Island where occasional heavy showers and even a few thunderstorms are possible. AIRMET Sierra remains in effect for tempo mountain obscuration for Maui Molokai, Oahu, and the Big Island, and will likely include Kauai this evening.

Additionally, strong high pressure remains northeast of the main Hawaiian Islands, keeping winds breezy to locally strong through the night, then increase again Sunday as a new, stronger surface high builds in north of the state. AIRMET Tango remains in effect for low- level mechanical turbulence over and immediately south through west of the mountains of all islands.

MARINE. Central East Pacific large and strong high pressure will maintain a tight pressure gradient across the Hawaiian Island waters and continue the strong trades. The early week eastern migration of a secondary northern Pacific high will keep the pressure gradient tight enough back across the islands to maintain these strong easterlies through the middle of the upcoming week. A mid week trough of low pressure moving across the Gulf of Alaska will weaken the regional gradient enough to allow mid to late week trades to fall back to more moderate magnitudes. Late week high pressure to the northwest of the islands will ensure moderate to locally strong trades through next weekend.

Several days of strong trades have created fully-developed, rough seas that will be the norm the next few days. A Small Craft Advisory for all of the Hawaiian coastal waters is in effect through Tuesday afternoon to account for widespread strong trades and associated high seas. Early week winds through the notoriously windier Alenuihaha Channel may frequently reach gale force. Thus, A Gale Watch is in effect for the Alenuihaha Channel from Sunday evening through Tuesday afternoon.

Satellite-derived winds still verify a large belt of strong trades focused in the vicinity and upstream of the state. This very long fetch of robust trades will support turbulent, fully-developed rough seas and generate high surf along most east-facing shorelines. Some of this trade wind wave and swell energy will wrap around into adjacent northern and southern exposures. The High Surf Advisory remains in effect through Tuesday for the east-facing shorelines of Kauai, Oahu, Molokai, Maui and the Big Island. Small to moderate northwest swells will fill in and peak surf from head high to a couple of feet above head high Sunday. The next northwest swells will be a couple of feet higher than this weekend's swell and likely push surf to near advisory level thresholds along northern and western-exposed shores Thursday. Small Southern Hemispheric background swells, along with trade wind wave and swell wrap, will keep fun category small south- facing shore surf alive the next few days.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST Tuesday for East facing shores of Kauai Oahu Molokai Maui and the Big Island.

Flash Flood Watch through Sunday afternoon for Maui Windward West-Windward Haleakala-Haleakala Summit-South Big Island-Big Island North and East-Big Island Interior.

Winter Weather Advisory until noon HST Monday for Big Island Summits.

Small Craft Advisory until 6 PM HST Tuesday for all Hawaiian waters except Alenuihaha Channel.

Gale Watch from Sunday evening through Tuesday afternoon for Alenuihaha Channel.

Small Craft Advisory until 6 PM HST Sunday for Alenuihaha Channel.



DISCUSSION . Birchard AVIATION . TS MARINE . Blood


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 14 mi66 min ENE 17 G 22 75°F 75°F1018.8 hPa
51205 22 mi64 min 76°F10 ft
51202 - Mokapu Point, HI (098) 72 mi64 min 76°F10 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI15 mi66 minENE 15 G 2510.00 miPartly Cloudy78°F62°F58%1018.9 hPa
Lanai City, Lanai Airport, HI17 mi64 minNE 24 G 3110.00 miFair and Windy71°F68°F90%1016.7 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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1 day agoNE26
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2 days agoE19
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S6CalmS3E9E14
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sat -- 03:47 AM HST     2.33 feet High Tide
Sat -- 06:48 AM HST     Sunrise
Sat -- 07:21 AM HST     Moonset
Sat -- 10:25 AM HST     0.04 feet Low Tide
Sat -- 04:04 PM HST     1.36 feet High Tide
Sat -- 06:30 PM HST     Sunset
Sat -- 07:19 PM HST     Moonrise
Sat -- 09:39 PM HST     0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.51.92.32.32.11.71.20.70.30.10.10.30.611.21.41.310.70.30.100.2

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sat -- 04:20 AM HST     2.43 feet High Tide
Sat -- 06:47 AM HST     Sunrise
Sat -- 07:20 AM HST     Moonset
Sat -- 10:43 AM HST     -0.06 feet Low Tide
Sat -- 04:38 PM HST     1.46 feet High Tide
Sat -- 06:29 PM HST     Sunset
Sat -- 07:18 PM HST     Moonrise
Sat -- 09:57 PM HST     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.21.82.22.42.421.50.90.30-00.10.50.81.21.41.41.20.80.40-0.10

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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