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Marine Weather and Tides Launiupoko, HI Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 6:05AM

Sunset 6:54PM

Monday August 19, 2019 3:55 AM HST (13:55 UTC)

Moonrise 9:50PM

Moonset 9:33AM

Illumination 84%

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 191341 afdhfo area forecast discussion national weather service honolulu hi 341 am hst Mon aug 19 2019 Synopsis A ridge of high pressure north of the state will keep trade winds blowing through the weekend. The trades will strengthen a bit during the middle of the work week, and again next weekend, otherwise light to moderate trades will prevail. Showers will favor windward and mauka areas, particularly during the overnight and early morning hours. A bit of an increase in shower activity is expected tonight through Tuesday night, particularly across windward sections of maui county and the big island. A bit more showery weather is also expected Thursday night through Friday night, as a front approaches from the north. Otherwise fairly dry trade wind weather will prevail. Discussion Currently at the surface, a east to west oriented ridge of high pressure is located around 325 miles north of kauai. The resulting gradient is producing light to moderate trade winds across the island chain early this morning. Infrared satellite imagery shows clear to partly cloudy skies in place in most areas, with some more extensive cloud cover lingering over leeward sections of the big island. Radar imagery shows a few light showers moving into windward areas, with mainly rain free conditions in leeward sections. Main short term concerns revolve around rain chances and trade wind trends over the next few days. A ridge of high pressure will remain north of the state through the forecast period, keeping trade winds blowing across the island chain. Light to moderate trades will continue through Tuesday night, although we should see a slight increase in trade wind speeds Monday night through Tuesday night as a weak trough of low pressure slides by to the south of the islands. Generally dry, stable trade wind weather will prevail today, with light showers mainly affecting windward and mauka areas. With the trough sliding by south of the state, we should see an increase in trade wind showers tonight through Tuesday night, particularly across windward sections of maui county and the big island. Drier more stable conditions along with moderate to locally breezy trade winds are expected to return Wednesday through Thursday, with windward and mauka areas remaining the main shower targets. A digging upper level trough north of the state in the vicinity of 30n, will drive a frontal boundary southward toward the islands Thursday night through Friday night, easing the trade winds back into the moderate range. Although the front isn't expected to make it southward into the state, elevated inversion heights and an increase in boundary layer moisture should bring more trade wind showers to the islands for the tail end of the work week as well. High pressure will then build northeast of the state next weekend, with deep layer ridging stabilizing the airmass over the islands as the upper level trough retrogrades westward. As a result, we should see a return of fairly dry trade wind weather and moderate to locally breezy conditions. Aviation Light to moderate trades winds will continue through the period.

Clouds and showers will favor windward and mountain locations, mainly through the overnight and early morning hours. Mostly dry conditions will prevail over leeward areas, with the exception being over the big island where clouds and showers form (best coverage through the afternoon and evening hours). Brief periods with MVFR CIGS and vsbys will be possible in and around showers. No airmets are currently in effect. Marine A nearly east to west oriented surface ridge located about 300 nm north of lihue is forecast to weaken and shift southward later today. This will result in light to moderate northeast trade winds across the hawaiian coastal waters. As a new surface high pressure system builds north of state from tonight through mid- week, east-northeast trade winds will gradually strengthen. Based on the latest forecast, trade winds are expected to reach the small craft advisory (sca) threshold starting Tuesday night across the typically windier waters adjacent to the islands of maui county and the big island. These SCA conditions may persist over these waters through Wednesday night. A weak surface front approaching the area from the north later this week is expected to cause a slight disruption in the pressure gradient over the region. Therefore, the trade winds are forecast to weaken slightly from Thursday through Friday. Surf along south facing shores will remain small early today, with mainly background swell energy from the southwest and southeast. An upward trend in surf is anticipated beginning later today as a new large, long-period south swell begins to spread across the hawaiian waters. Surface analysis charts showed a compact 956 mb storm-force low southeast of new zealand early last week, which produced a captured fetch aimed toward hawaii's swell window. Data from scatterometer passes confirmed an area of storm-force winds aimed northward during this time period. In addition, altimeter passes within this area showed seas ranging from 35 to 42 feet. This swell has already moved through the nearshore pacioos buoy at pago pago, which showed seas and energy levels that were slightly higher than our recent mid-july 2019 warning-level event along south facing shores. The possible limiting factor for this swell event in hawaii was that the storm was slightly more compact compared with other high surf events. Expect a high surf advisory (hsa) to be issued for south facing shores starting tonight. We will be monitoring observations in case a high surf warning might be required during the peak of this event on Tuesday or Tuesday night. The surf may not drop below the hsa criteria along south facing shores until Thursday based on the latest guidance. The small west swell associated with recent tropical cyclones in the northwest pacific will steadily trend down today. Surf along north and west facing shores of the smaller islands may increase from late Wednesday through Friday as small northwest swells spread down the island chain. Small, choppy surf may trend up slightly along east facing shores later this week as the trades strengthen. Hfo watches warnings advisories None. Discussion... Jelsema aviation... Gibbs marine... Houston

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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	62 min	N 6 G 6	78°F			1014.7 hPa
51213	18 mi	116 min			84°F	4 ft
51202 - Mokapu Point, HI (098)	66 mi	56 min			82°F	4 ft

Wind History for Kahului, Kahului Harbor, HI

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N6 G11

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Kahului, Kahului Airport, HI	14 mi	62 min	N 5	10.00 mi	Fair	76°F	69°F	79%	1015.1 hPa
Lanai City, Lanai Airport, HI	15 mi	60 min	NE 13	10.00 mi	Fair	71°F	71°F	100%	1014.1 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)

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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 and Satellite Images

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GOES 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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Wind Forecast for (9,2,3,4)

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Ground Weather Radar Station Molokai, HI

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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 numerious 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.