Tuesday, January19, 2021
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Marine Weather and Tides
Ualapu'e, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:04AMSunset 6:09PM Tuesday January 19, 2021 7:12 AM HST (17:12 UTC) Moonrise 11:44AMMoonset 12:00AM Illumination 38% Phase: Waxing Crescent; Moon at 6 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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PHZ120 Pailolo Channel- 651 Am Hst Tue Jan 19 2021
.small craft advisory in effect through late this afternoon...
Today..Northeast winds 20 knots. Wind waves 8 feet. Northwest swell 9 feet. Numerous heavy showers in the morning. Isolated Thunderstorms through the day. Scattered heavy showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 5 feet. Northwest swell 8 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Wednesday..East winds 15 knots rising to to 25 knots in the afternoon. Wind waves 4 feet. Northwest swell 7 feet. Scattered showers.
Wednesday night..East winds to 25 knots. Wind waves 5 feet. North swell 6 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 5 feet. North swell 5 feet. Isolated showers.
Thursday night..East winds to 25 knots. Wind waves 5 feet. North swell 4 feet. Isolated showers.
Friday..East winds to 25 knots. Wind waves 8 to 10 feet. Northwest swell 3 to 5 feet. Isolated showers.
Saturday..East winds to 25 knots. Wind waves 12 to 13 feet. Northwest swell 5 to 6 feet. Isolated showers.
PHZ100 651 Am Hst Tue Jan 19 2021
Synopsis for hawaiian coastal waters.. A surface trough near oahu will move steadily west through tonight, and will be west of kauai by Wednesday. NEar gale-force northeast winds will prevail west of the trough axis, with moderate easterly trade winds east of the trough. After the trough exits the area, high pressure far northeast of the islands will support moderate to fresh trade winds into the weekend.


7 Day Forecast for Marine Location Near Ualapu'e, HI
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location: 21.05, -156.88     debug


Area Discussion for -
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FXHW60 PHFO 191410 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 410 AM HST Tue Jan 19 2021

SYNOPSIS. An unstable cloud band associated with a low level trough begins to drift westward over Oahu and Kauai today with shower trends increasing over the western islands through tonight. Strong northeasterly winds will begin to ease over the eastern islands later this morning, becoming moderate to breezy trade winds for Maui and Hawaii Counties. Windy and wet weather conditions will continue over Oahu and Kauai through this afternoon. Improving weather trends are forecast from Wednesday through the end of the week with moderate to breezy easterly trade winds forecast with periods of showers favoring windward and mountain areas. Trade winds are expected to strengthen through the weekend with more scattered shower activity.

DISCUSSION. Abundant unstable moisture associated with a low level trough currently over Maui County this morning will move westward today spreading widespread rain and locally heavy showers back into Oahu and Kauai. This large band of showers will combine forces with strong and gusty northeasterly trade winds to produce several inches of rainfall along the windward and mountain slopes from Kauai to Maui today. The Flash Flood Watch to cover the elevated flooding threat was expanded westward to include Kauai County today. Enough dynamic forcing and instability over the region may produce a few thunderstorms along this unstable cloud band. Stronger winds are expected to shift back into Kauai today, and the Wind Advisory was expanded to include Kauai County.

Meanwhile out east, the Big Island will see improving weather trends through the day, with gradually decreasing rainfall amounts over Maui by this afternoon. A Winter Weather Advisory remains in effect for the highest peaks on the Big Island above 12,000 feet elevation, where an additional 1 to 2 inches of snow accumulations are forecast with patchy freezing fog until this evening. Wind speeds will be weaker today over these eastern islands. The Flash Flood Watch was cancelled for the Big Island. The Wind Advisory for Maui County was also cancelled due to these more moderate trade wind speeds.

Wednesday through Friday, trade winds will become moderate to breezy with periods of showers favoring windward and mountain areas, less showers are forecast over leeward areas.

Saturday and Sunday, trade winds will increase through the weekend, becoming breezy to windy easterlies on Sunday. Isolated to scattered showers remain in the forecast for both days favoring typical windward and mountain areas.

AVIATION. The front in the area has weakened to a trough and is moving slowly west, nearing Molokai as of this writing. Areas of MVFR cigs/vsbys can be expected along and near the trough, particularly in windward areas. Moderate to strong north to northeast winds will persist, mainly to the the west of the trough axis, as robust high pressure remains far north of the islands.

AIRMET Sierra remains in effect for mountain obscuration for windward sections of Kauai and Oahu, and for all of Molokai, Lanai and Maui.

AIRMET Tango remains in effect for low level turbulence over and downwind of the terrain from Kauai eastward to Maui. AIRMET Tango is also posted for high level turbulence over the western portion of the island chain.

AIRMET Zulu is in effect for TEMPO moderate rime icing from Kauai eastward to Maui.

MARINE. A surface trough, which appears to be near Maui early this morning, is moving slowly westward. There is also a broad surface high pressure system far north of the region. The tight pressure gradient between the trough and the surface high is producing gusty northeasterly winds and elevated, rough seas over most of the waters along and west of the trough. There are also elevated seas near the Big Island. A Small Craft Advisory (SCA) is now in effect for all waters, except Maalaea Bay. In addition to the strong winds and rough seas, widespread cloud cover, locally heavy downpours and isolated thunderstorms will likely continue across most of the state into tonight. Once the surface trough moves west of the state, expect a wet trade wind weather pattern to begin to set up later this week as a surface high builds far north- northeast of the region.

A large north-northwest swell combined with the locally generated wind waves is producing very large and disorganized surf along north and west facing shores of most of the islands early this morning. As a result, a High Surf Warning remains in effect through this morning for most north and west facing shores of the smaller islands. There is also a High Surf Advisory (HSA) in effect for north and west facing shores of the Big Island. The forecast guidance shows the swell direction will become more northerly later today and tonight. Therefore, we expect a HSA will be needed for the north and west facing shores of the smaller islands from this afternoon into tonight. Expect the HSA to eventually be cancelled by early Wednesday as the local winds decrease and the north swell gradually subsides.

Expect modest surf along most east facing shores due to the locally strong winds during the next couple of days. The surf will decrease somewhat by Thursday, but will increase again along east facing shores this weekend as the trade winds strengthen. Small background surf will persist along south facing shores through next weekend.

HFO WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch through this afternoon for Niihau-Kauai-Oahu- Molokai-Lanai-Kahoolawe-Maui.

Wind Advisory until 6 PM HST this evening for Niihau-Kauai-Oahu.

High Surf Warning until noon HST today for Niihau-Kauai Windward- Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Olomana- Molokai-Maui Windward West-Maui Central Valley-Windward Haleakala.

High Surf Advisory until noon HST today for Kona-Big Island North and East-Kohala.

Winter Weather Advisory until 6 PM HST this evening for Big Island Summits.

Flash Flood Watch through this afternoon for Maalaea Bay.

Small Craft Advisory until 6 PM HST this evening for all Hawaiian waters except Maalaea Bay.



DISCUSSION . Bohlin AVIATION . Kinel MARINE . Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 22 mi47 min 78°F5 ft
51205 24 mi47 min 77°F11 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 24 mi61 min NNE 8.9 G 12 74°F 75°F1015.5 hPa
51202 - Mokapu Point, HI (098) 49 mi47 min 77°F10 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaunakakai, Molokai Airport, HI14 mi19 minNNE 510.00 miLight Rain71°F59°F66%1015.1 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrN13----------------------------------NE11NE15NE13NE10NE10NE14
1 day agoN4
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NE12--------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Kamalo Harbor, Molokai Island, Hawaii
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Kamalo Harbor
Click for Map
Tue -- 01:49 AM HST     0.73 feet Low Tide
Tue -- 07:06 AM HST     Sunrise
Tue -- 07:33 AM HST     1.47 feet High Tide
Tue -- 11:43 AM HST     Moonrise
Tue -- 03:10 PM HST     0.18 feet Low Tide
Tue -- 06:09 PM HST     Sunset
Tue -- 09:59 PM HST     1.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.80.70.80.91.11.31.51.51.41.20.90.70.40.30.20.20.40.60.91.11.31.31.3

Tide / Current Tables for Kaunakakai, Molokai (Hawaii) (2)
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Kaunakakai
Click for Map
Tue -- 01:57 AM HST     0.73 feet Low Tide
Tue -- 07:07 AM HST     Sunrise
Tue -- 08:05 AM HST     1.47 feet High Tide
Tue -- 11:43 AM HST     Moonrise
Tue -- 03:18 PM HST     0.18 feet Low Tide
Tue -- 06:10 PM HST     Sunset
Tue -- 10:31 PM HST     1.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.80.70.80.91.11.31.41.51.41.310.80.50.30.20.20.30.60.811.21.31.3

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

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Ground Weather Radar Station




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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.