Monday, January20, 2020
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Marine Weather and Tides
Kapalua, 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 7:04AMSunset 6:10PM Monday January 20, 2020 7:01 AM HST (17:01 UTC) Moonrise 3:28AMMoonset 2:47PM Illumination 21% Phase: Waning Crescent; Moon at 25 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- 330 Am Hst Mon Jan 20 2020
.small craft advisory in effect through late this afternoon...
Today..East winds to 25 knots. Wind waves 7 feet. Northwest swell 5 feet. Isolated showers.
Tonight..East winds to 25 knots. Wind waves 6 feet. Northwest swell 4 feet. Isolated showers.
Tuesday..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 3 feet.
Tuesday night..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 3 feet.
Wednesday..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 3 feet increasing to 5 feet in the afternoon.
Wednesday night..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 8 feet.
Thursday..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 6 to 8 feet.
Friday..Winds variable less than 10 knots becoming northeast 15 knots. Wind waves 3 to 4 feet. Northwest swell 5 to 7 feet.
PHZ100 330 Am Hst Mon Jan 20 2020
Synopsis for hawaiian coastal waters.. A surface ridge far north of the area will be nearly stationary through today, and then move south. The ridge will be over the islands Wednesday and Thursday, with a front expected to be near kauai Friday.


7 Day Forecast for Marine Location Near Kapalua, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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FXHW60 PHFO 201400 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 400 AM HST Mon Jan 20 2020

SYNOPSIS. Breezy trade winds will continue today, then shift out of the southeast and diminish Tuesday through Friday. A mostly dry land and sea breeze pattern will result, with the best chance for a few clouds and showers setting up over interior areas through the afternoon periods. A front will stall and weaken near Kauai Friday with trades briefly returning Saturday.

DISCUSSION. A broad surface high centered just north of Hawaii will provide stable conditions and breezy trade winds today. Dew points are in the low to mid 60s across the state this morning with morning soundings at Hilo and Lihue indicating a strong inversion around 6 kft and precipitable water around 1 inch. Infrared satellite and radar both show an area of concentrated low clouds and showers that arrived last night and will move across the area, particularly Oahu and Maui County, through the morning. The low inversion should keep most of the rain and clouds windward, but may see an occasional shower reach the leeward side due to the breezy trades. The clouds and showers should dissipate by this afternoon and any rainfall will be on the lighter side.

A progressive pattern setting up over the northern Pacific is expected this week as the polar jet becomes highly zonal. Two fronts will passing to the north this week, with possibly a third early next week. The first front will shift the surface high towards the southeast and bring the associated ridge over the islands. The winds will respond by veering southeast and diminishing Tuesday through Friday, allowing a land and sea breeze regime to setup. Rain chances will remain limited due to the dry air and strong subsidence expected to continue through this time period. The best chance for a few clouds and light showers will shift over interior areas through the afternoon hours each day.

Long range GFS and ECMWF stall and weaken the second front near Kauai on Friday, with possible an uptick in showers for the northern end of the state. Trade winds may briefly return Saturday as a bubble high quickly passes north of the state before the next passing front to the north causes the wind to veer out of the southeast Sunday. This front is expected to weaken as it nears the island early next week, but it's too early to tell if it will directly impact the state.

AVIATION. Overnight, stratocumulus reformed near Kauai and Oahu bringing some lower ceilings to windward areas. More showery low clouds can be found over the windward areas of Maui and the Big Island, as well as the adjacent windward coastal waters. The stratocumulus is expected to burn off by mid morning while some of the showers will linger over windward areas. Brief periods of MVFR conditions are possible with these isolated showers, but expect VFR to prevail overall.

Breezy trade winds warrant the continuation of AIRMET Tango for tempo low level turbulence below 7,000 feet. Trades will weaken later today and Tango should be able to be canceled by tonight.

MARINE. A surface high passing far N of the islands is supporting breezy to strong NE to E trade winds, and a Small Craft Advisory (SCA) remains posted for all waters through this afternoon. As the high moves steadily E and a front approaches from the NW the next couple of days, winds will veer and gradually weaken as the associated ridge moves closer to the islands. Winds will become mainly E today, light SE to variable Tuesday, and light and variable Wednesday and Thursday as the ridge moves over the islands. A new high passing N of the islands around Friday will push a second front toward the islands, while supporting moderate trade winds heading into next weekend, with the front currently expected to stall near Kauai and Oahu.

A new long-period NNW swell is expected to peak at low-end advisory levels today, thus a High Surf Advisory remains in effect for exposed N and W shores. This swell will diminish late today and Tuesday, but will be followed on Wednesday by a significantly larger NW swell that will likely peak near High Surf Warning heights, with an even larger swell potentially arriving next Saturday. Choppy surf along E facing shores will gradually diminish as winds weaken the next couple of days. Winds and seas have warranted an extension of the existing SCA through this afternoon, but diminishing winds and seas will allow its cancellation by tonight or Tuesday at the latest. However, seas associated with the two large NW swells discussed above will warrant an SCA for most areas later this week.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for North and west facing shores of Kauai, Oahu, Molokai and Niihau, and north facing shores of Maui.

Small Craft Advisory until 6 PM HST this evening for all Hawaiian waters-



DISCUSSION . Foster AVIATION . Morrison MARINE . Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi31 min 77°F10 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi49 min ESE 5.1 G 8 68°F 75°F1019.6 hPa
51202 - Mokapu Point, HI (098) 61 mi31 min 77°F9 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI14 mi67 minE 610.00 miFair65°F60°F84%1019.8 hPa
Lanai City, Lanai Airport, HI23 mi65 minN 81.25 miFog/Mist63°F0°F%1019.2 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrNE8NE8NE14NE10NE16E17
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NE15N14--------------------------NE10
1 day agoN13N14N14NE11
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------------------------NE10
G21

Tide / Current Tables for Pukoo Harbor, Molokai Island, Hawaii
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Pukoo Harbor
Click for Map
Mon -- 12:33 AM HST     2.18 feet High Tide
Mon -- 03:28 AM HST     Moonrise
Mon -- 07:06 AM HST     Sunrise
Mon -- 08:09 AM HST     0.45 feet Low Tide
Mon -- 11:43 AM HST     0.79 feet High Tide
Mon -- 02:48 PM HST     Moonset
Mon -- 05:47 PM HST     -0.10 feet Low Tide
Mon -- 06:09 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.221.71.410.70.50.50.50.60.80.80.70.60.30.1-0.1-0.100.30.81.31.8

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Mon -- 01:01 AM HST     2.28 feet High Tide
Mon -- 03:27 AM HST     Moonrise
Mon -- 07:05 AM HST     Sunrise
Mon -- 08:17 AM HST     0.55 feet Low Tide
Mon -- 12:11 PM HST     0.89 feet High Tide
Mon -- 02:48 PM HST     Moonset
Mon -- 05:55 PM HST     -0.00 feet Low Tide
Mon -- 06:09 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.32.21.91.61.20.90.70.60.60.70.80.90.90.70.50.30.1-00.10.40.81.21.7

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
Wind Forecast for (12,3,4,5)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.