Friday, December4, 2020
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Marine Weather and Tides
Kahaluu-Keauhou, 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 6:39AMSunset 5:42PM Friday December 4, 2020 1:51 PM HST (23:51 UTC) Moonrise 9:49PMMoonset 10:30AM Illumination 76% Phase: Waning Gibbous; Moon at 20 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- 932 Am Hst Fri Dec 4 2020
.small craft advisory in effect through early Saturday morning...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Northwest swell 5 feet. Isolated showers.
Tonight..West of the big island, northwest winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 8 feet. Northwest swell 4 feet. Isolated showers.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Northwest swell 4 feet. Isolated showers.
Saturday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Northwest swell 5 feet. Isolated showers.
Sunday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 15 knots. Wind waves 6 feet. Northwest swell 5 feet. Isolated showers.
Sunday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. Northwest swell 7 feet. Scattered showers in the evening, then isolated showers after midnight.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 to 7 feet. Northwest swell 6 to 7 feet. Isolated showers.
Tuesday..West of the big island, winds variable less than 10 knots becoming north 10 knots in the evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Isolated showers.
PHZ100 932 Am Hst Fri Dec 4 2020
Synopsis for hawaiian coastal waters.. Ridge to the north will weaken over the weekend as another cold front passes to the north, then strengthen early next week.


7 Day Forecast for Marine Location Near Kahaluu-Keauhou, HI
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location: 19.61, -155.97     debug


Area Discussion for -
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FXHW60 PHFO 042002 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1002 AM HST Fri Dec 4 2020

SYNOPSIS. A passing surface high north of the islands will cause the trade winds to become rather breezy and gusty by this afternoon. Trades will then trend down tonight and Saturday, becoming light and variable over the western islands by Saturday afternoon. Light and variable winds will persist into Sunday, then give way to strengthening trades Monday into Tuesday as high pressure by to our north. Trade winds will become lighter later in the week as high pressure moves off to the northeast of the area. Passing light showers will persist when the trades a blowing with some interior showers possible during the lighter wind days.

DISCUSSION. A 1023 mb high is centered a few hundred miles north of the state. This is providing for moderate to locally breezy trade winds across the state. Pockets of moisture embedded withing the trades is providing for some brief passing showers over windward and mauka areas while most leeward locations are generally dry. These conditions are expected to persist through the day today.

The tail end of of a dissipating frontal band may sag south enough to cause a slight uptick in showers for windward and mauka areas over the west end of the state tonight and Saturday morning.

The high will have moved off to a position far northeast of the area by Saturday with trade winds becoming lighter and veering toward a more southeastly direction over the west end of the island chain.

Winds will remain light through the weekend as a front approaches the areas from the northwest. The front is forecast to stall and dissipate north of the area Monday and Tuesday. Meanwhile, a new high will be passing by north of the area with an uptick in trade winds expected.

By Wednesday, the high will be far northeast of the area while another front approaches from the northwest. Winds will once again become lighter favoring southeasterlies over the west end of the island chain. Models indicate some increase in moisture out ahead of this front so there may be some increase in shower activity across some areas.

AVIATION. Bands of low clouds and showers are moving into the eastern islands this morning, now affecting mostly Maui and Molokai, but beginning to diminish overall. AIRMET SIERRA for temporary mountain obscurations is in effect for Molokai, Maui, and the Big Island, but can likely be dropped by later this morning for Big Island and Maui. These showers could spread to Oahu later today and provide an uptick in trade showers to Kauai tonight.

High pressure far north of the Hawaiian Islands, will produce increasing trade winds into the moderate to breezy range across the region today as it moves eastward. Passing showers will focus mainly over mountains and along north and east facing slopes of each island today. Trades will shift out of a more easterly direction and begin to ease tonight as the remnants of a front approaches from the northwest and stalls west of Kauai.

MARINE. A high moving west to east, north of the state will generate strong trades through tonight. A Small Craft Advisory (SCA) is in effect for most Hawaiian coastal waters. Trades will drop off over the weekend, especially over the western end of the state. However, SCA may need to be extended through the weekend for building seas.

The large northwest swell that peaked Wednesday will continue to fade today. Wave Watch III is showing another northwest swell moving down the island chain quickly Saturday that may bring High Surf Advisory level surf to exposed shores. Long- period forerunners from another northwest swell is anticipated to fill in early Sunday which may drive surf heights along exposed north and west facing shores well above warning levels (XL category) and seas above the SCA criteria. This northwest swell should drop below the advisory levels by midweek.

This long stretch of advisory- to warning-level surf discussed above will only exacerbate the ongoing coastal erosion issues - especially with water levels running higher than predicted each day. The best chance for water to reach vulnerable coastal properties and roadways will be around and after daybreak Monday when the peak daily high tide could coincide with the peak of this next large swell.

Surf along east facing shores will remain small over the weekend, then trend up slowly next week as the trades fill in locally and upstream of the islands.

Surf along south facing shores will remain small with mainly a mix of small, short-period southeast and background south- southwest energy moving through.

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



DISCUSSION . Burke AVIATION . TS MARINE . Almanza


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi52 min WSW 13 G 15 79°F 80°F
ILOH1 - 1617760 - Hilo, HI 49 mi52 min N 4.1 G 5.1 78°F 81°F
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi52 min NE 17 G 23 79°F 79°F

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi59 minS 1210.00 miA Few Clouds85°F70°F61%1015.2 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSW8W7NW6W6NW5W3CalmSE5NE3NE5E5E5SE4E5E7SE6E8E6SE4S8SW6SW9S11S12
1 day agoW6NW8NW6NW4NW4NW4N5CalmS3SE7SE6SE8SE7SE9SE8E9E8E6NE4CalmW6W6SW7S9
2 days agoNW9W7W7W7SW5S4E6E4E4NE4E6E6E6E5E5E5E4E5NE5NE3N7W7W8NW7

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
Click for Map
Fri -- 06:26 AM HST     2.29 feet High Tide
Fri -- 06:44 AM HST     Sunrise
Fri -- 10:31 AM HST     Moonset
Fri -- 02:29 PM HST     0.29 feet Low Tide
Fri -- 05:44 PM HST     Sunset
Fri -- 06:53 PM HST     0.68 feet High Tide
Fri -- 09:48 PM HST     Moonrise
Fri -- 11:18 PM HST     0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.41.82.12.32.32.11.81.410.60.40.30.30.40.50.60.70.60.50.40.3

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Fri -- 06:36 AM HST     2.29 feet High Tide
Fri -- 06:43 AM HST     Sunrise
Fri -- 10:30 AM HST     Moonset
Fri -- 02:39 PM HST     0.29 feet Low Tide
Fri -- 05:44 PM HST     Sunset
Fri -- 07:03 PM HST     0.68 feet High Tide
Fri -- 09:48 PM HST     Moonrise
Fri -- 11:28 PM HST     0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.91.31.72.12.32.32.11.81.410.70.40.30.30.40.50.60.70.60.50.40.3

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 Kohala, 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.