Thursday, April9, 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 6:10AMSunset 6:44PM Thursday April 9, 2020 5:31 PM HST (03:31 UTC) Moonrise 8:55PMMoonset 7:42AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 352 Pm Hst Thu Apr 9 2020
Tonight..West winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Scattered showers in the evening, then isolated showers after midnight.
Friday..Southwest winds 10 knots. Wind waves 2 feet or less. Northwest swell 5 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Friday night..Southwest winds 15 knots. Wind waves 2 feet or less then 3 feet after midnight. Northwest swell 5 feet. Scattered showers.
Saturday..Southwest winds 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Chance of showers in the morning, then slight chance of showers in the afternoon.
Saturday night..West winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Chance of showers.
Sunday..Winds variable less than 10 knots becoming northeast 15 knots in the afternoon. Wind waves 2 feet or less. Northwest swell 4 feet. Chance of showers in the morning, then slight chance of showers in the afternoon.
Sunday night..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Slight chance of showers in the evening, then chance of showers after midnight.
Monday..East winds 10 knots. Wind waves 3 to 4 feet. Northwest swell 3 to 4 feet. Isolated showers.
Tuesday..East winds 10 knots. Wind waves 4 to 5 feet. Northwest swell 4 feet. Isolated showers.
PHZ100 352 Pm Hst Thu Apr 9 2020
Synopsis for hawaiian coastal waters.. A remnant frontal boundary lies near maui county while a surface ridge lies just se of the big island. A front will approach the area on Saturday and pass across the area Saturday night and Sunday. High pressure will build in north of the area behind the front.


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 100128 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 328 PM HST Thu Apr 9 2020

SYNOPSIS. Light and variable winds will persist through Friday, with clouds and showers over the islands most likely in the afternoon and evening. An increase in west to southwest winds is expected Friday into Saturday as a front approaches from the northwest. The front will bring a wind shift to the north, and a few showers, as it moves down the island chain Saturday night and Sunday. Light to moderate trade winds will begin to return late Sunday and continue through much of next week.

DISCUSSION. Currently at the surface, high pressure systems are located far to the west and northeast of the islands, with an area of low pressure well to the north of the state. Closer to home, the remnant moisture associated with a dissipated frontal boundary resides over the eastern islands. The resulting pressure gradient remains quite weak, with sea breezes in place state wide. Visible satellite imagery shows partly to mostly cloudy conditions, with cloud cover most prevalent over windward areas. Radar imagery shows scattered showers over windward areas, with mainly rain free conditions over leeward locales at the moment. Main short term concern revolves around rain chances the next few days.

A light wind regime is expected to remain in place tonight, with daytime sea breezes giving way to overnight land breezes. A cold front will approach from the northwest Friday through Saturday, bringing an increase in west to southwest winds. The front will slide southeastward across the island chain late Saturday through Sunday, with moderate north winds filling in behind the front Saturday night and shifting around to northeasterly trades on Sunday. High pressure will slide by to the north of the islands Sunday night and Monday, with light to moderate trades prevailing. The trades are expected to ease again Monday night through Tuesday night as surface troughing develops over the islands. Moderate trades are then expected to return Wednesday and continue through late next week.

As for weather details, a sea/land breeze pattern is expected to continue through Friday, with showers favoring interior mauka areas during the afternoon/evening hours and locations near the coast at night and during the morning hours. An approaching shortwave trough may de-stabilize things enough for a thunderstorm to pop over the Big Island Friday afternoon, so will mention a slight chance of thunderstorms here. Shower coverage should increase a bit Friday night and Saturday in the low level convergent flow ahead of the approaching front, with assistance from shortwave energy moving overhead. Showers will favor south and southwest facing slopes at night and during the morning hours and interior/mauka locations during the afternoon. A few showers will accompany the front as it slides southeastward through the islands Saturday night and Sunday, but no significant rainfall is expected. We should begin to see an increase in trade wind showers Sunday night and Monday, favoring the typical windward areas. Shower coverage and intensity may then increase Monday night through Tuesday night as surface troughing develops over the islands and some shortwave energy moves overhead. A more typical trade wind pattern should then return by the middle and latter part of next week.

AVIATION. Sea breezes did not disappoint and have delivered an uptick in cloud cover and showers over the Aloha State this afternoon. The Big Island is seeing the majority of the shower activity, with tops between 10,000-15,000 feet. MVFR conditions are likely with any of this shower activity statewide through the evening, though VFR will prevail.

Land breezes will take hold after sunset, allowing for clearing over interior sections of the islands. Friday looks to be similar to today with the sea and land breeze pattern continuing, although an approaching upper level trough may fuel some heavier showers by Friday night.

No AIRMETs are in effect or anticipated at this time.

MARINE. A remnant frontal boundary lies near Maui while the west end of a ridge of high pressure lies just southeast of the Big Island. The overall wind flow is light with slightly stronger south and southwest winds east of the boundary, mainly over the waters around the Big Island. Sea breezes nearshore will transition to land breezes overnight.

Winds will remain light Friday and Friday night, favoring a south to southwest direction, as another weak front approaches the area from the northwest. Low level winds will become more westerly on Saturday as the front nears the state. Guidance indicates a weak frontal boundary will move across the area Saturday night and Sunday with north to northeast winds filling in behind it. An area of high pressure will be passing by north of the area Sunday night through Monday night with moderate trade winds returning.

A small, short period northwest swell will continue to fill in tonight, peak on Friday, then lower gradually Saturday and Sunday. A series of very small, short period north swells will move through the area Saturday through Tuesday. A larger northwest swell is expected to arrive Tuesday night, peak Wednesday and Wednesday night, then lower gradually on Thursday. Surf heights may reach advisory levels during the peak of this swell. A series of small south swells will be moving through the area through the weekend and on through the middle of next week. Peak surf heights will likely be on Saturday when the largest of these swells arrive. Due to the lack of trade winds, surf will remain small along east facing shores on into early next week. With the expected uptick in trades around Tuesday and Wednesday, surf heights are expected to gradually pick up at that time.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Jelsema AVIATION . Dye MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi31 min 77°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi43 min NNE 8.9 G 9.9 76°F 78°F1013.5 hPa
51213 27 mi31 min 78°F3 ft
51202 - Mokapu Point, HI (098) 61 mi31 min 78°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI1 mi46 minW 815.00 miA Few Clouds81°F64°F58%1013.9 hPa
Kahului, Kahului Airport, HI14 mi37 minN 1010.00 miPartly Cloudy80°F68°F67%1014 hPa
Lanai City, Lanai Airport, HI23 mi35 minWNW 710.00 miFair74°F64°F71%1013.8 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr4--------------------------4--SW8SW4SW3W4W5--SW5W8
1 day ago5------------------------SE854464W856W105
2 days ago4------------------------6--S10S11SW10SW8W8SW8--SW84

Tide / Current Tables for Pukoo Harbor, Molokai Island, Hawaii
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Pukoo Harbor
Click for Map
Thu -- 03:47 AM HST     1.25 feet High Tide
Thu -- 06:12 AM HST     Sunrise
Thu -- 07:42 AM HST     Moonset
Thu -- 10:01 AM HST     -0.32 feet Low Tide
Thu -- 04:41 PM HST     2.03 feet High Tide
Thu -- 06:44 PM HST     Sunset
Thu -- 08:56 PM HST     Moonrise
Thu -- 11:36 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.60.91.21.31.10.80.50.1-0.2-0.3-0.20.10.61.21.7221.81.51.10.60.30.1

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 04:15 AM HST     1.35 feet High Tide
Thu -- 06:12 AM HST     Sunrise
Thu -- 07:41 AM HST     Moonset
Thu -- 10:09 AM HST     -0.22 feet Low Tide
Thu -- 05:09 PM HST     2.13 feet High Tide
Thu -- 06:44 PM HST     Sunset
Thu -- 08:55 PM HST     Moonrise
Thu -- 11:44 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.21.31.31.10.70.3-0.1-0.2-0.10.10.61.11.622.121.71.30.90.50.2

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 (23,6,7,8)
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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.