Friday, February21, 2020
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Marine Weather and Tides
Eleele, HI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:57AMSunset 6:33PM Friday February 21, 2020 1:28 AM HST (11:28 UTC) Moonrise 6:04AMMoonset 5:18PM Illumination 5% Phase: Waning Crescent; Moon at 27 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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PHZ112 Kauai Leeward Waters- 912 Pm Hst Thu Feb 20 2020
.small craft advisory in effect through early Friday morning...
Rest of tonight..East winds 20 knots. Wind waves 9 feet. Northwest swell 4 feet. Isolated showers through the night.
Friday..East winds 20 knots. Wind waves 8 feet. Northwest swell 4 feet. Isolated showers in the morning.
Friday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 7 feet. Northwest swell 6 feet. Isolated showers in the morning.
Saturday night..Southeast winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Isolated showers through the night.
Sunday..Winds variable less than 10 knots becoming southwest 10 knots in the afternoon. Wind waves 4 feet. Northwest swell 4 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..Winds variable less than 10 knots becoming northeast 10 knots after midnight. Wind waves 4 feet. Northwest swell 4 feet. Scattered showers.
Monday..Northeast winds 15 knots becoming east to 25 knots after midnight. Wind waves 5 to 7 feet. Northwest swell 4 to 6 feet. Scattered showers.
Tuesday..East winds to 25 knots...east 15 knots in the kaulakahi channel. Wind waves 7 to 8 feet. Northwest swell 8 to 10 feet. Isolated showers.
PHZ100 912 Pm Hst Thu Feb 20 2020
Synopsis for hawaiian coastal waters.. A strong surface high far north of the islands will move slowly east over the next couple of days, producing strong easterly trade winds, especially where the wind accelerates around the islands. By this weekend, the winds will gradually weaken, and shift out of the southeast as a front approaches from the northwest.


7 Day Forecast for Marine Location Near Eleele, HI
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location: 21.9, -159.59     debug


Area Discussion for -
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FXHW60 PHFO 210633 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 833 PM HST Thu Feb 20 2020

SYNOPSIS. The strong surface high responsible for the gusty trades will continue to move east, further away from the islands, resulting in diminishing trades into Saturday. Showers could be on the decline as the trades weaken. An approaching front will cause the trades to turn light and variable area-wide Saturday night, and a bit of southwesterlies on Sunday. The front stalls and weakens near Kauai Monday, allowing the return of light trades.

DISCUSSION. The surface high responsible for the strong and gusty trade winds is some 920 miles north-northeast of the islands this evening. It is heading east at 15 to 20 mph, and this action will result in continuing diminishing trades. The island-wide wind advisory has been scaled back to the eastern islands and is only good for this overnight period. We do not expect an extension of this wind advisory into Friday at this time.

Between now and Saturday, shower bearing clouds will continue to ride in with the trades, favoring the windward and mountain areas. These showers are expected to be trending less, in tandem with the weakening trades as we enter Saturday. A front will be approaching the islands from the west bringing on a light and variable winds regime to most islands Saturday night.

Both GFS and the ECMWF solutions have a front a couple hundred miles west of Kauai Sunday afternoon, with the islands under a light west to southwest wind flow. The GFS also shows a strong low level inversion at 8k feet Sunday afternoon area-wide that should maintain a mostly dry pattern.

The front stalls and gradually dissipates just north and west of Kauai Monday. In doing so, light trades start returning on Monday, and strengthen to moderate speeds Monday night. But as the front falls apart, some of its remnants may affect Kauai and Oahu.

AVIATION. AIRMET Tango remains in effect for tempo moderate low level turbulence over and downwind of the terrain due to the breezy trades. Stable stratocumulus clouds with isolated showers tracking in with the trades and could bring occasional MVFR ceilings across windward slopes/waters. Leeward areas should remain mostly clear to partly cloudy.

MARINE. A strong high is moving steadily east to the far north of the state with a very tight pressure gradient south of it. This is producing strong to near-gale force easterly trade winds over Hawaiian waters. A Small Craft Advisory (SCA) remains in effect through tonight for all Hawaiian waters, but will likely be scaled back tomorrow to include fewer areas as winds and seas slowly diminish.

As the high moves farther away to the east this weekend and a front approaches the state from the northwest, winds will begin shifting out of the east-southeast and weaken. The front is expected to move into the far northwest Hawaiian offshore waters Sunday, with increasing northeasterly trade winds returning behind the front.

A High Surf Advisory remains in effect through Friday afternoon for east facing shores of the islands due to the strong trade winds maintaining rough elevated surf. This surf will subside over the weekend as the trades weaken.

The current small northwest swell will gradually lower tonight through Friday. A slightly larger, long-period northwest swell arriving late Friday will likely peak on Saturday, then gradually lower Sunday through Monday. A large northwest swell is possible early next week. Elsewhere, a series of small south and south- southwest swells will maintain small background surf along south facing shores through this weekend.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST Friday for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West-Windward Haleakala-South Big Island-Big Island North and East.

Wind Advisory until 6 AM HST Friday for Lanai-Kahoolawe-Maui Windward West-Maui Leeward West-Maui Central Valley-Windward Haleakala-Leeward Haleakala-South Big Island-Big Island North and East-Kohala-Big Island Interior.

Small Craft Advisory until 6 AM HST Friday for all Hawaiian waters-



H Lau/Morrison/Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 13 mi65 min NE 14 G 16 73°F 79°F1023 hPa
51208 27 mi59 min 75°F9 ft
51201 - Waimea Bay, HI (106) 80 mi59 min 75°F7 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI14 mi36 minENE 1410.00 miOvercast73°F63°F71%1022.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI15 mi33 minENE 410.00 miA Few Clouds69°F63°F81%1022.1 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Fri -- 02:38 AM HST     1.80 feet High Tide
Fri -- 06:03 AM HST     Moonrise
Fri -- 07:05 AM HST     Sunrise
Fri -- 09:57 AM HST     0.11 feet Low Tide
Fri -- 02:42 PM HST     0.69 feet High Tide
Fri -- 05:18 PM HST     Moonset
Fri -- 06:38 PM HST     Sunset
Fri -- 08:17 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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1.21.51.81.81.61.410.70.40.20.10.20.30.50.70.70.60.40.30.1-000.20.5

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Fri -- 02:47 AM HST     2.01 feet High Tide
Fri -- 06:02 AM HST     Moonrise
Fri -- 07:04 AM HST     Sunrise
Fri -- 09:54 AM HST     0.13 feet Low Tide
Fri -- 02:51 PM HST     0.71 feet High Tide
Fri -- 05:17 PM HST     Moonset
Fri -- 06:37 PM HST     Sunset
Fri -- 08:14 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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1.31.71.921.91.61.20.80.40.20.10.20.40.50.70.70.60.50.30.1-000.20.6

Weather Map
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wmap_P
GEOS Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (6,6,7,8)
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Ground Weather Radar Station Kauai, HI
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.