Sunday, July12, 2020
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Marine Weather and Tides
Olowalu, 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 Sunday July 12, 2020 12:24 PM HST (22:24 UTC) Moonrise 12:03AMMoonset 12:29PM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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- 1015 Am Hst Sun Jul 12 2020
.small craft advisory in effect through early Monday morning...
Rest of today..North winds to 25 knots. Wind waves 3 feet.
Tonight..North winds to 25 knots. Wind waves 3 feet.
Monday..North winds to 25 knots. Wind waves 2 feet or less.
Monday night..North winds 20 knots. Wind waves 2 feet or less.
Tuesday..North winds 20 knots. Wind waves 2 feet or less. Scattered showers in the afternoon.
Tuesday night..North winds 20 knots. Wind waves 2 feet or less. Scattered showers in the evening.
Wednesday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Thursday..North winds 15 knots. Wind waves 2 feet or less.
PHZ100 1015 Am Hst Sun Jul 12 2020
Synopsis for hawaiian coastal waters.. High pressure north-northeast of the area is providing for breezy trade winds. The high is forecast to drift eastward over the next couple of days with a gradual decrease in trade wind speeds expected by Tuesday. These lighter trades will continue on into Thursday.


7 Day Forecast for Marine Location Near Olowalu, HI
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location: 20.75, -156.64     debug


Area Discussion for -
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FXHW60 PHFO 121958 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 958 AM HST Sun Jul 12 2020

SYNOPSIS. Moderate to locally breezy trades will continue through Monday, with an increase in trade showers expected beginning tonight as an upper level low nears the state. A more active shower pattern will hold through the middle of the week as the trade winds ease into the light to moderate range. A more typical trade wind shower regime will return for the end of the week, with lighter trades holding through Friday, then becoming breezy next weekend.

DISCUSSION. Our typical breezy trade wind weather will hold through today with some scattered showers over windward and mauka areas. Leeward areas with the exception of the Kona area will remain mostly dry and sunny for the rest of the day today.

An upper level low currently located about 550 miles north of Big Island will begin to inch closer and will likely bring some periods of enhanced moisture during the first half of the week. Beginning tonight, a slight increase of showers are expected across windward and mauka areas as a weak disturbance passes north of the islands. This weak disturbance is expected to pass north of Oahu Monday morning and move near Kauai by mid day. So overall, some light to moderate rain showers will be on the increase for Maui County and the Big Island tonight, Monday morning for Oahu and in the afternoon for Kauai. Trade winds will remain fairly breezy through the day Monday, but some fluctuations are expected particularly for Oahu and Kauai as this weak disturbances passes nearby.

Starting Tuesday, the high currently located far north-northeast of the state will begin to drift further east and away from the state. This will allow the trades to weaken to light to moderate speeds and will remain through much of the upcoming work week. Another round of some enhanced moisture is possible Monday night into Tuesday.

By the middle of the week, the upper level low will begin to drift further west and a drier air mass will begin to move in from the east. This should bring back our fair trade wind weather to the eastern half of the state on Wednesday, while some clouds and showers continue to linger over the western half of the state. Long story short, very little weather impacts are expected through the first half of the week, but an increase of clouds and showers are expected.

AVIATION. High pressure to the north will maintain a moderate to locally breezy trade wind pattern over the region through tomorrow. An upper level low to the northeast could enhance some of the trade wind shower activity that will be focused over windward and mountain areas. VFR conditions are expected to prevail, with some periods of MVFR in clouds and showers. Greater chance for MVFR conditions tonight and tomorrow as upper level low moves closer to the region.

AIRMET Tango remains in effect for mechanical turbulence to the lee of the islands. Expecting this AIRMET to remain in place for another day or so with the locally breezy trades in place.

No other AIRMETs expected today, however as alluded to above, an AIRMET for mountain obscuration is possible tonight or tomorrow with clouds and showers moving in.

MARINE. High pressure far to our north-northeast is providing for breezy trade winds across the area. A Small Craft Advisory (SCA) is currently posted for the typically windy waters around Maui County and the Big Island. The high is forecast to drift eastward over the next couple of days with a gradual decrease in trade wind speeds expected by Tuesday. The SCA will likely be discontinued by then. These lighter trade winds will continue through Thursday. Seas will remain well below the 10 foot SCA threshold throughout the forecast period.

Surf heights are expected to remain on the small side through the weekend and on through most of next week. There will be a series of small southerly swells that will keep surf near of just above background levels. A slightly larger long period south swell may fill in around Friday. East facing shores will continue to experience short period choppy surf produced by the trade winds. A small but slightly longer period east swell produced from Tropical Cyclone Cristina far in the eastern Pacific, may provide a slight uptick in surf heights during the late Tuesday through Friday time period. No other significant swells are expected.

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



DISCUSSION . Kino AVIATION . M Ballard MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 14 mi55 min NE 18 G 21 78°F 79°F1017 hPa
51213 19 mi59 min 81°F3 ft
51205 22 mi59 min 79°F6 ft
51202 - Mokapu Point, HI (098) 72 mi29 min 80°F6 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI15 mi31 minNE 2210.00 miPartly Cloudy and Breezy88°F66°F48%1016.8 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sun -- 12:03 AM HST     Moonrise
Sun -- 03:19 AM HST     0.27 feet Low Tide
Sun -- 05:53 AM HST     Sunrise
Sun -- 10:28 AM HST     1.38 feet High Tide
Sun -- 12:30 PM HST     Moonset
Sun -- 01:31 PM HST     Last Quarter
Sun -- 03:28 PM HST     0.94 feet Low Tide
Sun -- 07:11 PM HST     Sunset
Sun -- 08:48 PM HST     1.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.60.40.30.30.40.60.91.11.31.41.41.31.110.90.911.11.31.41.41.31.2

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sun -- 12:02 AM HST     Moonrise
Sun -- 03:37 AM HST     0.17 feet Low Tide
Sun -- 05:52 AM HST     Sunrise
Sun -- 11:02 AM HST     1.48 feet High Tide
Sun -- 12:29 PM HST     Moonset
Sun -- 01:31 PM HST     Last Quarter
Sun -- 03:46 PM HST     0.84 feet Low Tide
Sun -- 07:10 PM HST     Sunset
Sun -- 09:22 PM HST     1.51 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.70.40.20.20.30.50.81.11.31.41.51.41.210.90.80.91.11.21.41.51.51.4

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 (18,4,5,8)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.