Tuesday, February18, 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 6:53AMSunset 6:26PM Monday February 17, 2020 8:18 PM HST (06:18 UTC) Moonrise 2:21AMMoonset 1:35PM Illumination 30% 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- 332 Pm Hst Mon Feb 17 2020
.small craft advisory in effect through Wednesday afternoon...
Tonight..North winds to 25 knots. Wind waves 3 feet.
Tuesday..North winds to 25 knots. Wind waves 3 feet.
Tuesday night..North winds to 25 knots. Wind waves 3 feet. Isolated showers.
Wednesday..North winds to 30 knots. Wind waves 4 feet.
Wednesday night..North winds to 30 knots. Wind waves 4 feet.
Thursday..North winds to 30 knots. Wind waves 4 feet.
Thursday night..North winds to 25 knots. Wind waves 4 feet.
Friday..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds 20 knots. Wind waves 3 feet.
PHZ100 332 Pm Hst Mon Feb 17 2020
Synopsis for hawaiian coastal waters.. High pressure far northwest of the area will move east and strengthen through midweek, then gradually weaken on Friday.


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 180150 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 350 PM HST Mon Feb 17 2020

SYNOPSIS. A ridge of high pressure north of the state will bring breezy to locally windy trade wind weather through the week. Clouds and passing showers will favor windward and mountain areas, with isolated showers over leeward locations. Stronger trade winds with increasing shower trends are expected Tuesday through Thursday. Trade winds are expected to gradually decrease and veer to the southeast over the weekend as a weak front nears the state.

DISCUSSION. A ridge of high pressure will remain in place north of the Hawaiian Islands through the work week, keeping breezy to locally windy trade winds in the forecast. Latest radar and satellite imagery continues to show scattered showers upstream of the islands, which will lead to passing showers especially for the windward and mountain areas for tonight. for tonight For the most part, windward and mountain areas will see scattered shower activity over the next few days. Meanwhile on the leeward areas, isolated showers will be possible especially during the morning or overnight hours.

Weather conditions will slightly change Tuesday through Thursday as a strong ridge builds north of the islands. Trade wind speeds will increase and could reach wind advisory thresholds by Wednesday morning. Latest guidance is indicating advisory levels winds Wednesday and Wednesday night and possibly Thursday for some of the windier areas around Maui County and the Big Island and possibly Oahu. Additionally a few weak upper level troughs passing over the islands during the second half of the week will bring an increase in shower activity across the state. Showers will be likely over windward and mountain areas especially during the overnight and morning hours and isolated showers are expected over leeward sections of each island from through Thursday.

For Friday into the weekend, a series of cold fronts passing north of the state will begin to weaken the ridge and will cause the winds to gradually decrease starting Friday. Breezy trades are expected to hold through Saturday and become light and veer to the southeast on Sunday as a weakening front approaches. At this time, the front is expected to dissipate before reaching the islands, but the remnant moisture from the front will likely bring increasing showers sometime during the first half of next week.

AVIATION. A stable and breezy trade wind flow will persist through the next several days. AIRMET Tango remains posted, and will remain in effect for the next few days, for tempo moderate low level turbulence over and downwind of terrain. VFR conditions will dominate over leeward areas, while windward areas experience brief periods of MVFR ceilings and reduced visibility in passing showers.

MARINE. High pressure is currently centered far NW of the state resulting in fresh to locally strong trade winds across the area. Winds will gradually increase over the next couple of days as the high drifts slowly eastward, thus a Small Craft Advisory is currently posted for all Hawaiian Coastal Waters. Gale force winds are possible for some waters mainly around Maui County and the Big Island by midweek mainly where winds are accelerated by island terrain. The high will move off to a position NE of the area by the end of the week with trade wind speeds gradually diminishing.

The current small northwest swell will continue to lower tonight and Tuesday. A new small northwest swell is expected to arrive on Wednesday, peak Wednesday night, then lower gradually Thursday through Friday. A slightly larger northwest swell is expected to arrive late Friday and Friday night, peak on Saturday, then lower gradually Sunday and Monday.

The trade winds will keep surf elevated along east facing shores through the week. With the anticipated stronger trade winds beginning around midweek, surf heights may reach High Surf Advisory levels Wednesday through Thursday. With the expected drop off in wind speeds toward the weekend, surf heights will then diminish. A series of small, out of season south swells can also be expected through the week and on into next weekend.


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



DISCUSSION . Kino AVIATION . Wroe MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi55 min ENE 13 G 19 74°F 76°F1017.1 hPa
51205 18 mi49 min 76°F8 ft
51202 - Mokapu Point, HI (098) 66 mi49 min 76°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 mi2.5 hrsNNE 1210.00 miShowers in Vicinity73°F66°F78%1015.9 hPa
Kahului, Kahului Airport, HI14 mi25 minENE 1210.00 miPartly Cloudy73°F63°F71%1017.7 hPa
Lanai City, Lanai Airport, HI15 mi23 minNE 1610.00 miFair67°F64°F93%1016.4 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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1 day ago------------------------NE12NE11NE12
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2 days ago------------------------E14
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Tue -- 12:40 AM HST     2.19 feet High Tide
Tue -- 03:18 AM HST     Moonrise
Tue -- 06:55 AM HST     Sunrise
Tue -- 08:13 AM HST     0.39 feet Low Tide
Tue -- 12:31 PM HST     0.78 feet High Tide
Tue -- 02:26 PM HST     Moonset
Tue -- 05:40 PM HST     0.14 feet Low Tide
Tue -- 06:26 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.221.81.410.70.50.40.40.50.70.80.80.70.50.30.20.20.30.50.91.31.8

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 12:33 AM HST     2.20 feet High Tide
Tue -- 03:17 AM HST     Moonrise
Tue -- 06:54 AM HST     Sunrise
Tue -- 08:12 AM HST     0.90 feet Low Tide
Tue -- 10:35 AM HST     0.95 feet High Tide
Tue -- 02:25 PM HST     Moonset
Tue -- 05:17 PM HST     0.01 feet Low Tide
Tue -- 06:25 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.22.11.81.61.31.10.90.90.90.90.90.90.70.50.30.100.10.20.611.51.9

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 (1,6,7,8)
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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.