Saturday, July4, 2020
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Marine Weather and Tides
Holualoa, 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 5:45AMSunset 7:04PM Saturday July 4, 2020 2:12 PM HST (00:12 UTC) Moonrise 7:08PMMoonset 5:21AM Illumination 100% Phase: Full Moon; Moon at 14 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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PHZ123 Big Island Leeward Waters- 944 Am Hst Sat Jul 4 2020
Rest of today..Northwest winds 10 knots west of the big island...east 20 knots near south point. Wind waves 4 feet. Isolated showers.
Tonight..West of the big island, northwest winds 15 knots backing south after midnight. NEar south point, east winds 20 knots. Wind waves 4 feet. Isolated showers.
Sunday..North winds 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. SWell south 3 feet. Isolated showers.
Sunday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell south 3 feet. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell south 3 feet. Isolated showers in the morning.
Monday night..West of the big island, north winds 10 knots veering northeast after midnight. NEar south point, east winds 20 knots. Wind waves 7 feet. SWell southeast 3 feet. Isolated showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 6 to 7 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 6 to 7 feet. SWell southeast 3 feet. Isolated showers.
PHZ100 944 Am Hst Sat Jul 4 2020
Synopsis for hawaiian coastal waters.. A surface trough passing near kauai has weakened the pressure gradient over the state and will maintain light to moderate trades through Sunday. After the surface trough departs the region, a surface high will build far north of the state early next week, which will cause the trade winds to gradually strengthen.


7 Day Forecast for Marine Location Near Holualoa, HI
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location: 19.65, -156     debug


Area Discussion for -
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FXHW60 PHFO 041936 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 936 AM HST Sat Jul 4 2020

SYNOPSIS. Light to moderate east-southeasterly trades will continue through the holiday weekend. Showers will favor windward and mauka areas, although scattered showers will also affect leeward and interior areas at times. A more typical trade wind pattern will resume on Monday, with showers favoring windward and mauka areas along with the stray leeward spillover. This trade wind pattern will hold through late next week, with breezy conditions expected Tuesday into next weekend.

DISCUSSION. Currently at the surface, a weak trough of low pressure is located in the vicinity of Kauai, a 1030 mb high is centered around 1600 miles north of Honolulu, and another weak trough is present several hundred miles northeast of the state. The resulting gradient is producing light to moderate east-southeasterly trades across the island chain this morning. Visible satellite imagery shows mostly cloudy skies in most locales, with a few pockets of reduced cloud coverage scattered about the state. Radar imagery shows numerous windward showers, and scattered leeward showers, with coverage the greatest over Kauai and Oahu at the moment. Main short term concerns revolve around rain chances and trade wind trends.

The gradient will remain disrupted from the high far north of the islands during the next couple days by the trough of low pressure northeast of the state which will track westward. This trough should then begin to dampen out on Monday, allowing high pressure to become more dominant, with the high then sliding southward and closer to the islands Tuesday through late next week. Light to moderate east-southeasterly winds should hold in place through the remainder of the holiday weekend, with localizes sea and land breezes developing in the more sheltered leeward areas. Moderate trades will then return through the day on Monday and becoming breezy Tuesday through late next week.

Shower coverage is expected to be highest across the area today, as a plume of high precipitable water (PW) values (1.4 to 1.6 inches) moves overhead. Showers will favor windward areas, although scattered showers will also affect leeward/interior areas. Shower coverage should diminish this evening as daytime heating is lost and a pocket of lower PW values moves over the islands. Scattered windward showers will remain possible through the night and during the morning hours Sunday, with isolated leeward showers remaining possible mainly near the coast in the east-southeasterly boundary layer flow. Scattered showers will remain possible in windward areas Sunday afternoon, with scattered leeward/interior showers also expected to develop as a result of sea breezes and daytime heating influences. Showers should diminish in most leeward/interior areas Sunday evening, with scattered showers continuing in windward locales. As trade winds become more dominant on Monday, we should see a return of more typical trade wind weather, featuring mainly windward/mauka showers and a few leeward spillovers. This pattern appears to hold in place through late next week.

AVIATION. An area of moist air associated with a low level trough is moving slowly west across the main Hawaiian Islands. A trough aloft is making the atmosphere a bit unstable. This combination has been producing extensive MVFR ceilings and visibilities and isolated IFR ceilings over the islands. The low level flow is south of east, so more showers have been moving ashore in the Kau district of the Big Island than is typical. The east southeast flow also means that cloud lines that usually extend over water west southwest of the islands are extending west northwest and moving over islands farther downstream. These factors will likely mean a continuation of the extensive MVFR conditions through this evening. AIRMET Sierra for mountain obscuration is currently in effect for Kauai and Oahu and may need to be expanded.

Drier air will be spreading west across the area tonight and will bring higher cloud ceilings and fewer showers.

MARINE. A surface trough passing near Kauai has weakened the pressure gradient over the state and will maintain light to moderate trades through Sunday. After the surface trough departs the region, the forecast guidance indicates surface high pressure will build far north of the islands early next week. This will cause the trade winds to gradually strengthen. Therefore, Small Craft Advisory (SCA) conditions will likely develop across the typically windier waters adjacent to the islands of Maui County and the Big Island as early as Monday night, and continue through mid-week.

Surf is expected to remain below the High Surf Advisory criteria along all shorelines through early next week. Expect a mix of small background swells from the south-southeast and south- southwest through Tuesday. A new longer period south-southwest swell arriving Wednesday is expected to gradually build through Thursday. This may cause a slight increase in surf along most south facing shores by the middle of next week.

The weak trade wind regime will keep small surf along east facing shores into early next week. As the trade winds strengthen, expect choppy surf to increase along east facing shores from late Tuesday through the end of next week. Surf along most north facing shores will remain nearly flat for the foreseeable future. However, small background easterly trade wind wrap and small northwest swell energy may produce periods of tiny surf along some north facing beaches and reefs.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Jelsema AVIATION . Donaldson MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 28 mi54 min WSW 5.1 G 6 79°F 80°F1014.5 hPa
ILOH1 - 1617760 - Hilo, HI 50 mi54 min E 8.9 G 12 83°F 80°F1013.5 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi54 min ENE 15 G 22 80°F 81°F1014.8 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi19 minSW 1010.00 miPartly Cloudy84°F70°F63%1014.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrS10SW8SW7SW7S7SW6E7E6N6NE8NE6N8NE7NE7N7N11NE8NE6NW6W6SW7SW9SW9SW10
1 day agoSW11S11S11SW9S7S7S5SW10SW7CalmN9N4N4SW5SE8CalmN5SW3S6S8SW9SW10SW11SW12
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CalmSE5SE5SE5SE6SE10S7S8W7SW8SW10S11S11

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
Click for Map
Sat -- 02:40 AM HST     0.70 feet High Tide
Sat -- 05:20 AM HST     Moonset
Sat -- 05:50 AM HST     Sunrise
Sat -- 08:10 AM HST     -0.24 feet Low Tide
Sat -- 03:45 PM HST     2.56 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:06 PM HST     Sunset
Sat -- 07:07 PM HST     Moonrise
Sat -- 11:16 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.70.70.60.40.1-0.1-0.2-0.20.10.51.11.72.22.52.52.421.510.60.30.2

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Sat -- 02:50 AM HST     0.70 feet High Tide
Sat -- 05:20 AM HST     Moonset
Sat -- 05:50 AM HST     Sunrise
Sat -- 08:20 AM HST     -0.24 feet Low Tide
Sat -- 03:55 PM HST     2.56 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:06 PM HST     Sunset
Sat -- 07:06 PM HST     Moonrise
Sat -- 11:26 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.60.70.60.40.2-0.1-0.2-0.200.511.62.12.42.62.42.11.61.10.60.30.2

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 (20,4,5,8)
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Ground Weather Radar Station Kohala, HI
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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.