Monday, July13, 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 5:51AMSunset 7:11PM Monday July 13, 2020 11:33 AM HST (21:33 UTC) Moonrise 12:36AMMoonset 1:19PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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- 929 Am Hst Mon Jul 13 2020
.small craft advisory in effect through late this afternoon...
Rest of today..East winds to 25 knots. Wind waves 5 feet. Scattered showers. Isolated showers in the afternoon.
Tonight..East winds 15 knots. Wind waves 5 feet. Isolated showers in the evening. Scattered showers after midnight.
Tuesday..East winds 15 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..East winds 20 knots. Wind waves 5 feet. Scattered showers through the night.
Wednesday..East winds 20 knots. Wind waves 5 feet. Isolated showers through the day.
Wednesday night..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Thursday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Friday..East winds 20 knots. Wind waves 4 to 5 feet. Isolated showers.
PHZ100 929 Am Hst Mon Jul 13 2020
Synopsis for hawaiian coastal waters.. High pressure north-northeast of the area will keep fresh to strong trade winds in place today. A couple troughs moving by north of the islands will ease the trades slightly tonight through Friday.


7 Day Forecast for Marine Location Near Kapalua CDP, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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FXHW60 PHFO 131946 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 946 AM HST Mon Jul 13 2020

SYNOPSIS. Trade winds will weaken tonight and Tuesday, then remain on the lighter side for the next several days before strengthening over the weekend. The trade winds will deliver passing showers that will primarily favor windward areas during nights and mornings, but the lighter winds will allow some afternoon clouds and showers to develop over leeward areas.

DISCUSSION. Trade winds will diminish tonight and Tuesday, then remain on the lighter end of the spectrum for the next several days, with wind speeds increasing next weekend.

The local winds are expected to diminish and veer slightly toward the ESE over the next day or so, even though a surface high pressure cell far NE of the islands moves/changes very little. Instead, the decrease in winds will, in part, be due to weak low-level features passing between the islands and the high, acting to loosen the low- level pressure gradient.

One such feature is a weak low-level trough currently fueling increased trade showers over and near Kauai and Oahu, while Maui county and the Big Island have fewer showers arriving in the short term. An update to the short term forecast was issued to account for latest satellite/radar trends. Another weak low-level trough to the N of the islands (associated with a low aloft) will move W and sharpen to the NW of the islands from Tuesday into Thursday, while a trough marking the remnant of TS Cristina moves between the islands and the high later in the week. Additionally, a front will dig toward the islands from the NW toward the end of the week. All these features will act to keep the flow over the islands veered and diminished.

The lighter winds will allow afternoon leeward sea breezes to drive cloud and shower formation that will diminish after sunset. Warming mid-level temperatures are expected in the short term as the low aloft to the N moves W the next couple of days. A stabilizing mid- level ridge will then prevail into the weekend, and shower coverage and intensity will be limited, especially since most of the moisture slug associated with the remnants of Cristina will pass well N of the islands. As the low aloft moves to a position NW of Kauai, it will continue to deliver some periods of high clouds. Latest guidance has the bulk of the high clouds over Kauai and Oahu, potentially becming thick at times from Tuesday into Thursday.

AVIATION. A high pressure system far to the north northeast will drive moderate to fresh trade winds across the state through at least tonight. Low clouds and showers will impact mainly windward portions Kauai and Oahu into this afternoon, with drier conditions expected across the rest of the state. Mountain obscurations, occasional MVFR ceilings and visibility are expected around these showers. AIRMET SIERRA is posted for tempo mountain obscurations above 2500 feet along north through east sections of Oahu.

The clouds and showers should pass west of Kauai this evening. The next area of moisture is expected to arrive from the east tonight potentially impacting most windward areas.

AIRMET TANGO remains in effect below 8000 feet for south through west of mountains on all islands due to tempo moderate turbulence.

MARINE. High pressure far north-northeast of the islands will keep fresh to strong trades in place through this afternoon. As a result, a Small Craft Advisory (SCA) remains posted for the typically windy waters around Maui County and the Big Island. A couple troughs of low pressure will pass by to the north of the state Tuesday through Friday, easing the trades into the moderate range in most areas, with fresh trades periodically affecting the typically windier channel waters. Trades should then ramp back up to locally strong levels next weekend as high pressure strengthens far to the north of the island chain.

There will be a series of small southerly swells over the next several days that will keep south shore surf near of just above background levels. A slightly larger long period south swell may fill in over the weekend. East facing shores will continue to experience short period surf produced by the trade winds locally and upstream of the state. A small but slightly longer period east swell produced from former tropical cyclone Cristina, may provide a slight uptick in surf heights during the late Tuesday through Thursday time frame. No other significant swells are expected.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST this evening for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Birchard AVIATION . Foster MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi68 min 79°F6 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi64 min 80°F
51213 27 mi38 min 82°F3 ft
51202 - Mokapu Point, HI (098) 61 mi38 min 80°F6 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 mi49 minNE 10 G 2015.00 miA Few Clouds86°F62°F46%1015.9 hPa
Kahului, Kahului Airport, HI14 mi40 minENE 16 G 2910.00 miPartly Cloudy88°F63°F43%1015.6 hPa
Lanai City, Lanai Airport, HI23 mi38 minVar 310.00 miOvercast75°F69°F82%1015.7 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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------------------------NE8NE12--E8NE10
G20
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Mon -- 12:36 AM HST     Moonrise
Mon -- 03:53 AM HST     0.26 feet Low Tide
Mon -- 05:53 AM HST     Sunrise
Mon -- 11:23 AM HST     1.59 feet High Tide
Mon -- 01:18 PM HST     Moonset
Mon -- 05:22 PM HST     0.93 feet Low Tide
Mon -- 07:11 PM HST     Sunset
Mon -- 09:39 PM HST     1.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.70.50.30.30.30.50.811.31.51.61.61.51.31.110.90.911.11.21.21.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 12:35 AM HST     Moonrise
Mon -- 03:10 AM HST     0.51 feet Low Tide
Mon -- 05:52 AM HST     Sunrise
Mon -- 10:56 AM HST     1.48 feet High Tide
Mon -- 01:18 PM HST     Moonset
Mon -- 02:59 PM HST     1.35 feet Low Tide
Mon -- 07:10 PM HST     Sunset
Mon -- 07:54 PM HST     1.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.70.60.50.50.70.811.21.41.51.51.51.41.41.31.41.41.51.51.61.51.41.2

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 (17,4,5,8)
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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.