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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.

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Sunrise 7:03AM

Sunset 6:11PM

Friday January 22, 2021 2:54 PM HST (00:54 UTC)

Moonrise 1:27PM

Moonset 1:56AM

Illumination 72%

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.

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7 Day Forecast for Marine Location Near Launiupoko, HI

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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

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI	12 mi	54 min	ENE 21 G 28	77°F	76°F		1015 hPa (-2.4)
51213	18 mi	58 min			79°F	3 ft
51205	18 mi	28 min			77°F	8 ft
51202 - Mokapu Point, HI (098)	66 mi	28 min			78°F	8 ft

Wind History for Kahului, Kahului Harbor, HI

(wind in knots)    EDIT      (on/off)   Help

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Last 24hr

E21 G26

E19 G25

E16 G24

E16 G23

E14 G23

E4 G9

E8 G14

E11 G17

NE10

E8 G11

E9 G12

E10 G14

NE8 G13

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NE13 G16

NE7 G11

E10 G15

NE14 G18

NE17 G22

E16 G24

E19 G26

NE18 G25

1 day ago

E19 G24

E17 G23

E16 G22

E14 G19

E13 G19

E9 G14

E3 G10

NE6 G11

NE12 G15

N9 G13

NE13 G17

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NE12 G16

NE13 G17

E10 G14

NE7 G12

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NE7 G11

NE13 G17

E18 G24

E14 G20

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E16 G23

2 days ago

NE14 G20

E13 G16

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E15 G20

E20

NE12 G17

NE13 G16

E4 G9

NE8 G12

SE3 G6

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SE1 G4

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N7 G10

NE2

E4 G10

NE10

N1

E11 G14

E12 G16

E17 G21

E16 G21

E17

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Lahaina - West Maui, HI	12 mi	69 min	ENE 20	15.00 mi	Partly Cloudy and Breezy	79°F	63°F	58%	1015.2 hPa
Kahului, Kahului Airport, HI	14 mi	60 min	ENE 19 G 32	10.00 mi	A Few Clouds and Breezy	82°F	62°F	51%	1015 hPa
Lanai City, Lanai Airport, HI	15 mi	58 min	NE 12 G 23	10.00 mi	Overcast	77°F	61°F	58%	1013.9 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)

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NE13 G21

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NE12

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NE15 G24

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NE20

1 day ago

E12

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NE10 G17

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E11 G20

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E15

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NE10 G17

NE14 G21

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NE15

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Tide / Current Tables for Lahaina, Maui Island, Hawaii

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Tide / Current Tables for Kihei, Maui (Hawaii) (2)

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Weather Map

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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

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Ground Weather Radar Station

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