Monday, November30, 2020
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Marine Weather and Tides
Naalehu, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:37AMSunset 5:41PM Monday November 30, 2020 7:48 AM HST (17:48 UTC) Moonrise 6:16PMMoonset 6:57AM Illumination 100% Phase: Full Moon; Moon at 15 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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PHZ124 Big Island Southeast Waters- 342 Am Hst Mon Nov 30 2020
Today..Northeast winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet and northeast 3 feet. Isolated showers and Thunderstorms in the morning.
Tonight..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Slight chance of showers in the evening.
Tuesday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet.
Tuesday night..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet increasing to 8 feet after midnight. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 10 feet. Isolated showers through the day.
Wednesday night..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 10 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..East winds 15 knots. Wind waves 5 feet. Northwest swell 6 to 8 feet. Scattered showers.
Friday..Northeast winds 20 knots. Wind waves 7 to 8 feet. Northwest swell 4 to 5 feet. Isolated showers.
PHZ100 342 Am Hst Mon Nov 30 2020
Synopsis for hawaiian coastal waters.. Ridge to the north will weaken through the first half of the week as a series of cold fronts pass by north of the area. A new high will build in north of the area on Friday. A large northwest swell will build across the hawaiian waters Tuesday, then peak Tuesday night through Wednesday, then slowly subside Thursday and Friday.


7 Day Forecast for Marine Location Near Naalehu, HI
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location: 19.08, -155.55     debug


Area Discussion for -
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FXHW60 PHFO 301330 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 330 AM HST Mon Nov 30 2020

SYNOPSIS. A weakening high pressure ridge north of the islands will keep light and variable winds with local scale land and sea breezes in the forecast through much of the work week. An upper level disturbance passing through the eastern half of the state will keep enhanced showers during the early morning hours today. Cooler and drier trends will spread from west to east starting today. Isolated to scattered showers are possible each afternoon over island interior sections, with clearing at night through Thursday. Moderate to breezy trade winds return by Friday.

DISCUSSION. This mornings water vapor satellite imagery shows an upper level low passing through the eastern half of the state. This low will produce enough instability for a few thunderstorms over the Big Island and the eastern half of Maui County today. Local radar imagery shows scattered to numerous showers drifting into the windward slopes of each island on the waning trade winds. Drier conditions will spread from west to east across the state later today. Unstable conditions will linger over the Big Island this afternoon, as the upper low drifts southeastward, for scattered showers and possible thunderstorms.

Meanwhile, the high pressure ridge north of the islands will continue to weaken as a cold front moves across the Central Pacific basin. Trade winds will diminish into the light and variable range for most areas through Thursday. Local scale land and sea breezes will develop over each island as the large scale winds diminish. Onshore sea breezes will build clouds and a few showers over island interior sections each afternoon. Land breezes, caused by overnight cooling over the land, will clear out clouds and showers during the overnight to early morning hours.

By Friday morning, a high pressure system builds in north of the islands causing a return in the trade wind flow. Expect moderate to breezy trades from Friday afternoon into Saturday with more typical windward and mountain shower activity.

By Sunday another cold front approaching the Hawaiian Islands from the northwest will weaken the high pressure ridge yet again, keeping the islands in a fairly dry east to southeast wind regime.

Global weather models are in good agreement in the short term forecast with the upper trough moving east of the state later today allowing drier and more stable air to move in across the region. Medium range model solutions are in fair agreement at this point with several days of light winds along with cooler temperatures and lower rainfall trends through Thursday.

AVIATION. High pressure north of the state will weaken today, allowing the trades to diminish, with sea breezes developing in many areas this afternoon. Showers will favor windward and mauka areas through the early morning hours, with a few daytime heating showers possible over the island interiors this afternoon.

AIRMET Sierra remains in effect for mountain obscuration over windward sections of Kauai and Oahu. Conditions should improve in the next few hours.

AIRMET Tango remains in effect for moderate upper level turbulence between FL200 and FL300. Conditions should improve by daybreak.

MARINE. Moderate to fresh northeast trade winds will gradually shift out of the east and relax through the day as a cold front passes to north. This will result in a land and sea breeze regime statewide later today through midweek as the progressive pattern featuring a series of fronts passing to the north continues. Fresh trades could briefly return late in the week (Friday/Saturday) as a ridge noses eastward behind one of the fronts. Despite the light winds, the largest swell of the season is expected to build down the island chain Tuesday and peak Tuesday night through midweek - driving seas well above the 10 ft Small Craft Advisory threshold for waters exposed to northwest swells.

Surf along north facing shores will build later today due to a mix of lingering north-northeast swell and a new north-northwest swell arriving. This new swell should peak by tonight, then gradually ease into Tuesday.

The largest swell of the season is expected to build down the island chain through the day Tuesday with up to 25 second forerunners. Guidance has trended up with this event over the past few days and now depicts a peak Tuesday night into Wednesday with surf likely reaching the giant (40 ft faces or greater) category along exposed shores. Latest satellite data reflect this potential and showed a decent sized area of hurricane force winds (up to 65 kt) focused at the islands within the 310 to 320 degree directional band Saturday. Recent SOFAR drifter buoys near the fetch are recording wave heights (40-45 ft) overnight that are mostly in line with predicted levels.

Impacts will include significant beach erosion with water potentially sweeping across areas of the beaches that typically remain dry Tuesday night through the day Wednesday. The best chance for water making it onto the vulnerable coastal roadways and property will be after midnight through daybreak Wednesday as the peak of the swell and daily peak tide coincide.

Looking ahead into next weekend, another significant event appears possible based on the latest model cycles - that are depicting a more compact, hurricane-force low developing and lifting northeastward across the central Pacific Friday through Saturday driving seas to 50 ft. WAVEWATCH III and ensemble wave data reflect this and depict another significant swell arriving in the islands Sunday night into early next week. Forecast confidence this far out remains low and changes are likely in the coming days as conditions evolve.

Surf along east facing shores will drop through the first half of the week as the trades diminish.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Bohlin AVIATION . Jelsema MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 52 mi49 min SW 1.9 G 5.1 65°F 80°F1014.5 hPa (+1.0)

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI46 mi56 minE 510.00 miA Few Clouds73°F62°F69%1014.5 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrE43SW6S7S8SW6SW8S11S11S11S10E7E9E5NE8N5NE6CalmSE11SE6SE6E7E5E5
1 day agoCalmCalmS5S11SW7SW10W8SW8SE11SE13SE11E6E4CalmNE4NE5NE7NE6CalmE7NE5E4NE5E5
2 days ago3SE7S6SW8SW8N106N18N23
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Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Mon -- 03:48 AM HST     2.73 feet High Tide
Mon -- 06:38 AM HST     Sunrise
Mon -- 06:57 AM HST     Moonset
Mon -- 11:09 AM HST     0.51 feet Low Tide
Mon -- 03:18 PM HST     1.31 feet High Tide
Mon -- 05:43 PM HST     Sunset
Mon -- 06:15 PM HST     Moonrise
Mon -- 09:01 PM HST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.82.32.62.72.62.21.81.30.90.60.50.60.91.11.31.31.10.80.50.20.10.20.5

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Mon -- 03:58 AM HST     2.33 feet High Tide
Mon -- 06:41 AM HST     Sunrise
Mon -- 06:59 AM HST     Moonset
Mon -- 11:13 AM HST     0.41 feet Low Tide
Mon -- 03:28 PM HST     0.91 feet High Tide
Mon -- 05:43 PM HST     Sunset
Mon -- 06:16 PM HST     Moonrise
Mon -- 09:05 PM HST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.51.92.22.32.21.91.51.10.80.50.40.50.60.80.90.90.80.60.30.100.10.3

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
Ground Weather Radar Station South Shore, HI
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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.