Thursday, April2, 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 6:17AMSunset 6:42PM Wednesday April 1, 2020 7:02 PM HST (05:02 UTC) Moonrise 12:28PMMoonset 1:19AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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- 335 Pm Hst Wed Apr 1 2020
Tonight..Northeast winds 15 knots. Wind waves 2 feet or less.
Thursday..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers through the day.
Saturday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Sunday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
PHZ100 335 Pm Hst Wed Apr 1 2020
Synopsis for hawaiian coastal waters.. A high far northeast of the area and a weak trough over the eastern offshore waters will maintain gentle to locally fresh wind speeds through the weekend. Winds will veer out of the southeast starting tomorrow as a front approaches from the northwest.


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 020147 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 347 PM HST Wed Apr 1 2020

SYNOPSIS. Deep low pressure developing far northwest of the state on Thursday will cause trade winds to veer out of the southeast, leading to a somewhat unstable land and sea breeze regime that will produce spotty showers, some briefly heavy, over the islands during the afternoon hours. Winds will turn more southerly on Friday and the weekend, likely drawing up deeper moisture over the islands and fueling more shower activity. A front associated with the low is expected to maintain wet conditions over the state on Monday and Tuesday.

DISCUSSION. Weak trades have been overpowered by sea breezes this afternoon, while an upper level trough overhead is maintaining unstable conditions. As a result, heavy showers and isolated thunderstorms have flared over interior sections, mainly on the Big Island and also on Oahu, where a weak surface trough is passing by. Expect heavy shower activity to taper off late this afternoon, with showers lingering on the Big Island a bit longer. The weak trough will move westward, bringing a few showers to windward Kauai.

For tonight, weak trades will hang on with modest showers favoring windward slopes. Deep troughing at the surface and aloft will continue to dominate across the Pacific north of the state, splitting a pair of strong surface highs and suppressing the local trades. leeward shower activity will clear out quickly by evening. With available moisture limited, modest showers will favor windward slopes, even though conditions will remain unstable.

Trade winds will gradually shift out of the southeast on Thursday as an area of deep low pressure develops in the trough far northwest of the state. While showers will favor east and southeast slopes, a land and sea breeze regime will dominate over leeward areas, leading to clouds and spotty afternoon showers, some briefly heavy. Aside from the interior slopes of the Big Island, thunderstorms are unlikely.

As the deep low settles about 850 miles northwest of the state on Friday, shower chances will increase as winds shift more southerly and draw deeper moisture over the islands. The state will be under the outer portion of the upper level trough associated with the low, likely leading to enough instability to trigger isolated heavy showers. Thunderstorms cannot be ruled out but confidence is not high enough to include them at this time. As a front associated with the low edges closer to the state on Sunday, shower chances should increase, especially across the western end of the state. In addition, the southerly flow will push dew points up to around 70, bringing an increase humidity that we have not experienced for a while.

On Monday and Tuesday, the front, or what is left of it, is expected to push across portions of the island chain, stalling perhaps as far east as Maui during the middle of next week. The latest runs of the GFS and ECMWF have come into better agreement on this scenario, but somewhat high uncertainty remains.

AVIATION. Weak flow will persist this afternoon as a trough passes over the islands. Sea breeze formations along the coast have allowed for shower development over the interiors of the islands. Enough instability exists for isolated areas of heavier showers or thunderstorms.

Most activity is expected to dwindle by sun down. Tonight, light winds will ensue state wide with a few showers along the windward coasts and slopes.

No AIRMETS are in effect at this time.

MARINE. A surface high far northeast of the area is maintaining easterly trade winds across Hawaiian waters, but a trough over the eastern offshore waters will keep the winds gentle to locally fresh though Thursday.

A low south of the Aleutians is forecast to move south and approach the area, causing winds to veer out of the southeast beginning Thursday. Winds will weaken over the western part of the coastal and offshore waters but winds may strengthen over eastern waters, especially where the southeast flow accelerates around the Big Island and Maui. A convergence band associated with the low will likely move over the northwest offshore waters Saturday, strengthening south winds over the western waters and bringing another chance of thunderstorms.

The current small northwest swell will slowly subside through Friday night. A new swell building Saturday will produce moderate surf along north and west facing shores over the weekend, but is expected to remain well below the advisory threshold. Swells from the southern hemisphere will maintain elevated surf along south facing shores through tomorrow, but should remain just below advisory levels. Swells from the distant southeast Pacific will be partly blocked by the islands of French Polynesia, but should be enough to produce small surf through the rest of the week. Surf along east facing shores will remain up through midweek due to an upstream fetch, despite the trades relaxing locally, then subside by the end of the week.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Wroe AVIATION . Thomas MARINE . TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi45 min NE 11 G 14 74°F 76°F1013.9 hPa
51205 17 mi33 min 75°F6 ft
51213 19 mi33 min 77°F3 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi78 minNE 10 G 1715.00 miA Few Clouds77°F62°F61%1013.2 hPa
Kahului, Kahului Airport, HI13 mi69 minNE 1510.00 miPartly Cloudy76°F66°F72%1013.8 hPa
Lanai City, Lanai Airport, HI16 mi67 minW 910.00 miMostly Cloudy72°F68°F87%1013.2 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr------------------------E84N10N10N12--W10NW8NW10N14NE10
G17
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1 day ago------------------------N15N13N15NE11
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2 days ago------------------------NE12--N12N12NE12NE14
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 02:13 AM HST     Moonset
Thu -- 06:18 AM HST     Sunrise
Thu -- 06:42 AM HST     0.20 feet Low Tide
Thu -- 11:50 AM HST     0.76 feet High Tide
Thu -- 01:27 PM HST     Moonrise
Thu -- 04:31 PM HST     0.26 feet Low Tide
Thu -- 06:41 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.71.410.70.40.20.20.30.50.60.70.80.70.60.40.30.30.40.611.41.72

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 02:12 AM HST     Moonset
Thu -- 06:17 AM HST     Sunrise
Thu -- 07:33 AM HST     0.72 feet Low Tide
Thu -- 09:44 AM HST     0.75 feet High Tide
Thu -- 01:27 PM HST     Moonrise
Thu -- 03:51 PM HST     0.22 feet Low Tide
Thu -- 06:40 PM HST     Sunset
Thu -- 11:49 PM HST     2.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.81.61.31.10.90.80.70.70.70.70.70.60.50.40.30.20.30.50.81.21.61.92.1

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.