Sunday, January19, 2020
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Marine Weather and Tides
Launiupoko, 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 6:09PM Sunday January 19, 2020 2:49 AM HST (12:49 UTC) Moonrise 2:28AMMoonset 2:01PM Illumination 32% Phase: Waning Crescent; Moon at 24 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- 902 Pm Hst Sat Jan 18 2020
.small craft advisory in effect through early Monday morning...
Rest of tonight..North winds to 30 knots. Wind waves 4 feet.
Sunday..North winds to 30 knots. Wind waves 4 feet.
Sunday night..North winds to 25 knots. Wind waves 4 feet.
Monday..North winds to 25 knots. Wind waves 3 feet.
Monday night..Northeast winds to 25 knots. Wind waves 3 feet.
Tuesday..East winds to 25 knots in the morning becoming variable less than 10 knots. Wind waves 3 feet in the morning then 2 feet or less.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less.
Thursday..Winds variable less than 10 knots. Wind waves 2 feet or less.
PHZ100 902 Pm Hst Sat Jan 18 2020
Synopsis for hawaiian coastal waters.. A high northwest of the area will move east through the coming week. A ridge trailing southwest from the high will shift south over the area Wednesday and persist through Thursday.


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 190618 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 818 PM HST Sat Jan 18 2020

SYNOPSIS. Locally breezy trade winds will continue through the holiday weekend as surface high pressure passes north of the state. Stable conditions will produce only light showers across windward areas of Kauai and Oahu, while modest showers will persist on windward Big Island and Maui County. Trades will diminish and shift southeasterly on Tuesday, followed by a stable land and sea breeze pattern Wednesday through Friday.

DISCUSSION. A stable and breezy northeasterly trade wind flow remains in place. The trades are being driven by a 1026 mb surface high centered about 750 miles northwest of the state, and a mid level ridge building in from the west is producing very stable conditions with an inversion ranging about 4,000 over western islands to nearly 8,000 ft near the Big Island. Stable stratocumulus clouds are piled up along windward slopes and waters around Kauai and Oahu, where scant rainfall occurred today and is expected tonight. A small pocket of moisture is moving onto windward slopes of Maui and the Big Island, where modest rainfall of generally less than a half inch is due tonight.

A stable, rather dry, and breezy trade wind flow will dominate over most areas this holiday weekend. Surface high pressure will passing north of the state will produce locally breezy trades, and mid level ridging will maintain stable conditions with a strong low level inversion. Showers will remain slightly active through tomorrow across windward slopes of the Big Island and Maui, with a few afternoon showers on Kona slopes. Otherwise, at times extensive cloud cover over windward areas will only produce light showers, while leeward weather will remain dry. With dew points hovering in the upper 50s to lower 60s in the breezy trades, it will feel cool, even though temperatures will be close to January normal.

Trades will gradually decline on Monday night and Tuesday as the surface high moves off to the east. Stable trade wind weather will persist, with light showers confined to windward slopes and afternoon sea breezes possible by Tuesday.

Trades will likely be disrupted for the second half of the work week as an approaching front pushes the surface ridge over the islands. A stable land and sea breeze pattern is expected. The GFS and ECMWF are now showing the front stalling near or just north of Kauai on Friday night and Saturday as trades gradually rebuild.

AVIATION. Moderate to strong northeast trade winds flow will continue through Sunday as a high pressure system passes north of the islands. Expect AIRMET Tango for low level turb below 7k feet south through west of mountain ranges of all islands to continue through 191600 UTC.

An area of clouds and showers with MVFR conditions came on shore affecting the windward sections of Molokai and Maui, resulting in AIRMET Sierra for mountain obscuration. We expect this area of weather to thin out by sunrise Sunday. The tops of these clouds and showers are no higher than 8k feet, and bases are around 2k feet as per surface observations. The intensity of these showers are mainly light but with some brief vis restrictions. This same area of clouds and showers is currently moving onshore of the Big Island's Hamakua coast. This area poses a threat of issuing AIRMET Sierra at any time. As for Oahu and Kauai, they are being affected by a large broken to overcast deck of stable stratocumulus clouds with cloud bases around 35 hundred feet. Tops are around 5 to 6k feet. They contain some isolated to patchy light showers or drizzle with no apparent vis restrictions. Fair skies ruled the lee areas of Molokai and Maui and the lee side of the Big Island. Lanai may get some brief periods of low clouds as they leak over from windward Maui.

MARINE. A high northwest of the area will move east through the coming week. The high is producing strong to near-gale force northeast trade winds over the Hawaii coastal waters. A Small Craft Advisory (SCA) is in effect for all Hawaiian waters through Sunday night due to a combination of the strong winds and elevated seas. As the high moves farther east, winds will shift out the east and weaken below SCA speeds by Tuesday. On Wednesday a ridge will shift south over the coastal waters. Winds speeds will become gentle to moderate and wind directions variable.

The strong trade winds are producing moderate rough surf along north and east facing shores. This surf will gradually subside next week as the trades weaken.

A new swell building Sunday may boost surf to High Surf Advisory levels along north and west facing shores Sunday afternoon into Monday. This swell will gradually lower from late Monday through Tuesday.

A very large northwest swell building on Wednesday may produce surf reaching the High Surf Warning threshold. As that swell subsides, an even larger northwest swell may arrive next weekend.

Surf will remain small along south facing shores.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Monday for all Hawaiian waters.



DISCUSSION . Wroe AVIATION . H Lau MARINE . Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi55 min NE 13 G 18 73°F 75°F1019.3 hPa
51205 18 mi49 min 77°F9 ft
51202 - Mokapu Point, HI (098) 66 mi49 min 77°F8 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 mi55 minNE 1710.00 miA Few Clouds72°F60°F66%1019.7 hPa
Lanai City, Lanai Airport, HI15 mi53 minE 13 G 221.25 miA Few Clouds with Haze65°F59°F81%1017.6 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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1 day ago------------------------N8N10
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2 days ago------------------------E8N13545--SW865544

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sun -- 12:12 AM HST     2.07 feet High Tide
Sun -- 02:28 AM HST     Moonrise
Sun -- 07:05 AM HST     Sunrise
Sun -- 07:11 AM HST     0.71 feet Low Tide
Sun -- 11:00 AM HST     1.01 feet High Tide
Sun -- 02:00 PM HST     Moonset
Sun -- 05:11 PM HST     0.01 feet Low Tide
Sun -- 06:08 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.121.81.51.210.80.70.70.91110.80.60.30.100.10.30.61.11.51.9

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sun -- 12:46 AM HST     2.17 feet High Tide
Sun -- 02:27 AM HST     Moonrise
Sun -- 07:04 AM HST     Sunrise
Sun -- 07:29 AM HST     0.61 feet Low Tide
Sun -- 11:34 AM HST     1.11 feet High Tide
Sun -- 02:00 PM HST     Moonset
Sun -- 05:29 PM HST     -0.09 feet Low Tide
Sun -- 06:08 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.221.71.410.80.60.60.811.11.110.70.40.1-0.1-0.10.10.40.81.31.8

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 (7,2,3,4)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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Disclaimer:
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.