Friday, January22, 2021
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Marine Weather and Tides
Launiupoko, 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 7:03AMSunset 6:11PM Friday January 22, 2021 2:54 PM HST (00:54 UTC) Moonrise 1:27PMMoonset 1:56AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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- 952 Am Hst Fri Jan 22 2021
.small craft advisory in effect through Sunday afternoon...
Rest of today..Northeast winds 20 knots. Wind waves 3 feet.
Tonight..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds to 30 knots. Wind waves 3 feet.
Saturday night..North winds to 25 knots. Wind waves 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..North winds to 25 knots. Wind waves 3 feet. Scattered showers.
Sunday night..Northeast winds to 30 knots. Wind waves 4 feet. Scattered showers.
Monday..North winds to 25 knots. Wind waves 3 to 4 feet. Scattered showers.
Tuesday..North winds to 25 knots. Wind waves 3 to 4 feet. Scattered showers.
PHZ100 952 Am Hst Fri Jan 22 2021
Synopsis for hawaiian coastal waters.. High far northeast of the area will support moderate to locally strong trade winds today. The high will strengthen over the weekend into early next week with trade winds becoming stronger statewide.


7 Day Forecast for Marine Location Near Launiupoko, HI
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location: 20.85, -156.68     debug


Area Discussion for -
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FXHW60 PHFO 222002 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1002 AM HST Fri Jan 22 2021

SYNOPSIS. Strong and gusty trade winds will become especially strong over the weekend, delivering passing clouds and showers, some briefly heavy, mainly dampening windward areas. More widespread rainfall may develop early next week as winds remain strong and shift to the southeast.

DISCUSSION. While winds are elevated, the grids were a little higher than recent observations. Have nudged the wind grids down just a touch to be closer to current observations through this evening, while continuing the upward trend that is observed in the models. Currently the grids reflect winds remaining just below advisory levels today, but exceeding advisory criteria tonight in some locations. Will be taking a closer look over the next couple of hours, but leaning towards the need for a Wind Advisory for some locations for tonight. The areas covered by any such advisory will likely need to be expanded over the weekend as winds increase.

The overnight surface analysis depicts a 1035 mb high to the northeast of the islands, and a series of troughs and fronts to the northwest. The ridge associated with the high is expected to nudge closer to the islands tonight, tightening the pressure gradient over the island, which should cause an uptick in winds. As the troughs and fronts to the northwest move to the east over the weekend, and a low potentially develops along these boundaries, we can expect the wind direction to become a little more southeasterly by early next week. At the same time, the high to the northeast will be reinforced over the weekend and strength, causing the winds to increase further.

While today still looks to be a little on the drier side, an uptick in trade wind showers is expected through the weekend, and a further increase in activity from Sunday night into Wednesday.

A broad mid to upper level low to the south of the state has brought some upper level clouds to the southern end of the state recently, but the latest satellite imagery shows most of that has moved to the south and east of the Big Island. Cooler than normal mid-level temperatures associated with the low are supporting a somewhat unstable island atmosphere, with radar VWPs indicating the low-level moisture riding in on the trade flow extending as high as 9 to 10 thousand feet. Combined with the stronger trade winds mentioned above, orographic forcing is helping to generate showers over and immediately downstream of the terrain. Meanwhile, many leeward communities remain mostly dry.

As the winds become more southeasterly, a moisture convergence band extending southeast from the low creeps towards the islands from the south. The latest guidance indicates this band will move over portions of the islands from Monday into Wednesday, bringing precipitable water values close to 2", layered cloudiness, and widespread rainfall. Deep moisture and modest instability are expected, so the chance of thunderstorms appears too low to mention thus far. A drying trend is loosely expected thereafter as the band shifts west of the area. High pressure to the distant northeast will continue to support locally strong trade winds.

AVIATION. A strong surface high is in place far northeast of the main Hawaiian Islands today and will remain somewhat stationary through the next few days. This will keep breezy to locally strong easterly trade winds persistent throughout the forecast period. Showers will favor eastern sections of the islands, particularly during the night and early morning hours. As a result, VFR conditions are expected to prevail across the Hawaiian Islands throughout the period, with the exception of brief MVFR conditions in any heavier showers that do occur.

AIRMET Tango remains in effect for moderate low-level turbulence in areas southwest to west of the mountains of all islands. The persistence of breezy to strong easterly trade winds across the islands will likely allow for this low-level turbulence to continue into the weekend. AIRMET Tango also remains in effect moderate turbulence between FL250 and FL300.

MARINE. A surface high far northeast of the area is generating moderate to locally strong trade winds. The high will strengthen Saturday, increasing trade winds across the entire area through the first part of next week. A Small Craft Advisory is in effect for all coastal water for strong to near gale force trade winds as well as building seas from the trade wind swell and a large west- northwest swell.

A small northwest swell will linger today. Long-period forerunners from a larger west-northwest (310 degrees) swell will arrive late today and tonight. This swell is expected to peak Saturday with an 18 second period and high-end advisory or low-end warning level surf for most north and west facing shores of the smaller islands. The more westerly direction of this swell will allow west facing shores of the Big Island to experience advisory level surf, likely later in the day Saturday. Swell and surf will lower gradually Sunday and Monday, then become rather small for this time of year on Tuesday and Wednesday.

As the trades strengthen this weekend, rough and short-period surf will gradually rise and a High Surf Advisory is likely along east facing shores for several days, beginning Saturday afternoon.

Small, mainly background, southerly swells are expected over the next several days. A small bump is south-southwest surf is expected to gradually fill in Monday, peak Monday night and Tuesday, then lower Wednesday through Thursday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters-



DISCUSSION . M Ballard AVIATION . Donaldson MARINE . Almanza


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi54 min ENE 21 G 28 77°F 76°F1015 hPa (-2.4)
51213 18 mi58 min 79°F3 ft
51205 18 mi28 min 77°F8 ft
51202 - Mokapu Point, HI (098) 66 mi28 min 78°F8 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi69 minENE 2015.00 miPartly Cloudy and Breezy79°F63°F58%1015.2 hPa
Kahului, Kahului Airport, HI14 mi60 minENE 19 G 3210.00 miA Few Clouds and Breezy82°F62°F51%1015 hPa
Lanai City, Lanai Airport, HI15 mi58 minNE 12 G 2310.00 miOvercast77°F61°F58%1013.9 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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1 day agoE12--------------------------------NE10
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--NE15

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 01:56 AM HST     Moonset
Fri -- 07:05 AM HST     Sunrise
Fri -- 07:14 AM HST     0.80 feet Low Tide
Fri -- 10:16 AM HST     0.97 feet High Tide
Fri -- 01:25 PM HST     Moonrise
Fri -- 04:40 PM HST     0.23 feet Low Tide
Fri -- 06:11 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.71.61.41.110.80.80.80.9110.90.70.60.40.30.20.30.50.81.21.51.8

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Fri -- 12:32 AM HST     1.90 feet High Tide
Fri -- 01:55 AM HST     Moonset
Fri -- 07:04 AM HST     Sunrise
Fri -- 07:32 AM HST     0.70 feet Low Tide
Fri -- 10:50 AM HST     1.07 feet High Tide
Fri -- 01:25 PM HST     Moonrise
Fri -- 04:58 PM HST     0.13 feet Low Tide
Fri -- 06:10 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.91.71.51.210.80.70.70.911.110.90.60.40.20.10.20.40.711.41.7

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
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.