Friday, January17, 2020
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Marine Weather and Tides
Lahaina, 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 6:08PM Friday January 17, 2020 5:26 AM HST (15:26 UTC) Moonrise 12:31AMMoonset 12:34PM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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- 308 Am Hst Fri Jan 17 2020
.small craft advisory in effect through Sunday afternoon...
Today..Winds variable less than 10 knots becoming north to 25 knots in the afternoon. Wind waves 2 feet or less. Scattered showers.
Tonight..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds to 25 knots. Wind waves 3 feet.
Saturday night..North winds to 30 knots. Wind waves 3 feet.
Sunday..North winds to 30 knots. Wind waves 3 feet.
Sunday night..North winds to 30 knots. Wind waves 3 feet.
Monday..North winds to 25 knots. Wind waves 3 feet.
Tuesday..North winds to 25 knots becoming variable less than 10 knots. Wind waves 2 feet or less.
PHZ100 308 Am Hst Fri Jan 17 2020
Synopsis for hawaiian coastal waters.. High pressure will build north of the area over the weekend behind a front passing to the north. Ridge of high pressure will shift southward into the area by Tuesday.


7 Day Forecast for Marine Location Near Lahaina, HI
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location: 20.88, -156.68     debug


Area Discussion for -
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FXHW60 PHFO 171432 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 432 AM HST Fri Jan 17 2020

SYNOPSIS. A weakening cold front is moving into Kauai this morning. A low level trough over the islands will produce unsettled weather and showers ahead of the frontal cloud band. This diminishing cold front will reach Oahu later this morning, showers will spread further eastward down the island chain reaching the Big Island by this afternoon. Drier and clearing trends are forecast to develop after the front passes each island with breezy north to northeasterly winds as another high pressure system builds into the region. Sunny skies with drier trends and fair weather conditions will last through the first half of next week.

DISCUSSION. A weakening cold front is currently moving eastward through Kauai and the Kauai Channel this morning with numerous showers developing along this band as it passes through the western islands of Kauai and Oahu. A low level trough over Maui this morning is producing moderate to heavy showers over portions of Maui County. Radar reports and rain gauge observations as of 4 AM HST indicate rainfall rates of 1 to 2 inches per hour were falling over Windward West Maui. Expect enhanced shower activity to continue along the frontal zone and east of the front near the low level trough as elevated moisture levels instability will continue to favor scattered to numerous showers this morning from Kauai to Maui. Enhanced showers with this system will reach the Big Island later this afternoon.

Trade winds continue to bleed out ahead the frontal boundary this morning with wind speeds forecast to increase behind the front as high pressure builds in quickly after it passes through each island. North winds at 25 MPH sustained are being reported at Barking Sands at 4 AM HST. Expect north to northeasterly moderate to breezy winds to spread over the western half of the state this morning with higher wind speed trends reaching the eastern islands of Maui and the Big Island later this afternoon and evening.

Saturday through Tuesday, trade winds are forecast to continue through Monday before diminishing once again by Tuesday afternoon as another cold front moves into the region and the Central Pacific high center drifts further east away from the state. A high pressure ridge aloft will bring added stability with drier trends forecast for most islands through the period. One exception to this drier weather trend will develop along the windward slopes of the Big Island and East Maui, where bands of unstable showers from a remnant frontal boundary may drift into both islands riding into the windward slopes on the trade winds.

Wednesday through Thursday, the long range model guidance shows a cold front stalling out roughly 500 miles northwest of Kauai with the Hawaiian Islands falling under the southwestern edge of the subtropical ridge. This means light southeasterly background winds developing across the state, with a weakening upper level ridge aloft, leading to a land and sea breeze regime with onshore winds during the day and offshore winds at night. Converging onshore winds will build cloud ceilings over each island during the late morning and afternoon hours and then diverging offshore winds will clear out most of the cloud cover each night. Low shower trends are forecast through this time period and precipitation chances in our current forecast grids may be reduced further with the next forecast grid package.

AVIATION. A weak, slow-moving surface trough remains over Maui as an advancing front is moving onto Kauai. Showers have been active overnight across slopes of Maui County, where AIRMET Sierra for mountain obscuration is in effect. AIRMET Sierra is also posted for north slopes of Kauai due to clouds and reduced VIS along the front. Both AIRMETs will likely remain posted through the morning and may need to be expanded to Oahu mid morning. VFR conditions will prevail over leeward areas of all islands.

The front will weaken as it moves down the island chain today. NNE winds, already in place on Kauai and Oahu, will strengthen significantly over most islands today, likely requiring AIRMET Tango for low level turbulence over and downwind of terrain for at least the western half of the state today.

AIRMET Tango for tempo moderate turbulence is in effect for Maui and the Big Island between FL250 and FL400. The upper trough producing the turbulence is moving eastward, and this AIRMET will be dropped shortly. Another disturbance aloft may produce mid to upper level turbulence over Kauai and Oahu later this morning.

MARINE. Strong northerly winds will fill in through the day today as high pressure builds north of the region behind a passing front. The Small Craft Advisory (SCA) currently in place has been expanded down the island chain due to a combination of these winds and seas expected to quickly ramp up through the day. The offshore buoys northwest of Kauai are already reflecting these conditions with 25 to 30 kt northerly winds and seas up to 14 ft.

Saturday through Monday, the winds will hold in the fresh to locally strong category while gradually shifting out of a more easterly trade wind direction. Light and variable winds will become a possibility Tuesday through the second half of next week as the progressive pattern across the northern Pacific continues and a couple of fronts pass to the north.

Surf along east facing shores will remain small due to the lack of strong trades locally and upstream. Easterly locations with a northerly exposure, however, may trend back up today through the weekend as the strong northerly winds and northerly swell build down the island chain.

Surf along north facing shores will trend up quickly today as a medium period north swell fills in. Expect rough conditions along exposed shores due to the expected short wave periods (10-11s) and strong onshore winds. Heights may approach advisory levels up north if the seas surge higher than predicted tonight, which is typical for these patterns. A long-period north-northwest swell expected Sunday will likely drive surf heights up to advisory levels by Sunday night for north and west facing shores. This will hold through Monday before lowering Tuesday.

For the extended, guidance shows a pattern shift across the northern Pacific featuring two gale- to storm-force systems racing eastward from Japan to the Date Line over the weekend and again early next week. If this materializes, a large long-period northwest swell will be the result locally Wednesday through the second half of the week.

Surf along south facing shores will remain small through early next week with mainly small background southwest swells expected.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel- Oahu Windward Waters-Kaiwi Channel-Maui County Windward Waters- Maalaea Bay-Pailolo Channel-Alenuihaha Channel.



DISCUSSION . Bohlin AVIATION . Wroe MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi57 min W 2.9 G 5.1 71°F 75°F1011.1 hPa
51205 17 mi57 min 78°F6 ft
51202 - Mokapu Point, HI (098) 65 mi57 min 77°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI13 mi33 minW 42.50 miHeavy Rain Fog/Mist71°F69°F94%1011.9 hPa
Lanai City, Lanai Airport, HI16 mi31 minE 61.25 miFog/Mist66°F0°F%1011.1 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr------------------------E8N13545--SW865544
1 day ago------------------------SE8
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2 days ago------------------------NE7
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 12:31 AM HST     Moonrise
Fri -- 03:00 AM HST     Last Quarter
Fri -- 03:26 AM HST     0.87 feet Low Tide
Fri -- 07:05 AM HST     Sunrise
Fri -- 08:44 AM HST     1.48 feet High Tide
Fri -- 12:34 PM HST     Moonset
Fri -- 03:41 PM HST     0.05 feet Low Tide
Fri -- 06:07 PM HST     Sunset
Fri -- 11:14 PM HST     1.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.210.90.911.21.31.51.51.41.20.90.60.30.10.10.20.40.81.21.51.71.8

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 12:30 AM HST     Moonrise
Fri -- 12:53 AM HST     1.02 feet Low Tide
Fri -- 03:00 AM HST     Last Quarter
Fri -- 07:05 AM HST     Sunrise
Fri -- 07:19 AM HST     1.86 feet High Tide
Fri -- 12:33 PM HST     Moonset
Fri -- 02:57 PM HST     0.29 feet Low Tide
Fri -- 06:06 PM HST     Sunset
Fri -- 10:34 PM HST     1.60 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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111.11.21.41.61.81.91.81.71.41.10.80.50.30.30.40.50.81.11.31.51.61.6

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 (10,2,3,4)
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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.