Friday, January22, 2021
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Marine Weather and Tides
Captain Cook, 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 6:56AMSunset 6:08PM Friday January 22, 2021 5:33 AM HST (15:33 UTC) Moonrise 1:26PMMoonset 1:51AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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- 338 Am Hst Fri Jan 22 2021
.small craft advisory in effect through Sunday afternoon...
Today..West winds 10 knots west of the big island...east to 30 knots near south point. Wind waves 9 feet. Northwest swell 3 feet. Haze. Scattered showers.
Tonight..North winds 10 knots west of the big island...east to 30 knots near south point. Wind waves 8 feet. Northwest swell 3 feet. Haze. Isolated showers.
Saturday..West of the big island, southeast winds 10 knots backing northwest in the afternoon. NEar south point, east winds to 30 knots. Wind waves 8 feet. Northwest swell 6 feet. Isolated showers in the morning.
Saturday night..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 8 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon. NEar south point, east winds to 30 knots. Wind waves 10 feet. Northwest swell 6 feet. Haze. Showers likely.
Sunday night..Northwest winds 10 knots west of the big island... East to 30 knots near south point. Wind waves 11 feet. Northwest swell 5 feet. Haze. Scattered showers.
Monday..West of the big island, southwest winds 10 knots veering west in the afternoon, then backing southeast in the evening backing north after midnight. NEar south point, east winds to 30 knots. Wind waves 11 to 12 feet. Northwest swell 3 to 5 feet. Haze. Scattered showers.
Tuesday..West of the big island, southwest winds 10 knots in the morning becoming variable less than 10 knots, then becoming south 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 10 feet. Haze. Scattered showers.
PHZ100 338 Am Hst Fri Jan 22 2021
Synopsis for hawaiian coastal waters.. High pressure far northeast of the area will support moderate to locally strong trade winds today. The high will strengthen over the weekend into early next week with trade winds becoming stronger statewide.


7 Day Forecast for Marine Location Near Captain Cook, HI
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location: 19.46, -155.96     debug


Area Discussion for -
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FXHW60 PHFO 221340 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 340 AM HST Fri Jan 22 2021

SYNOPSIS. Strong and gusty trade winds will become especially strong over the weekend, delivering passing clouds and showers, some briefly heavy, mainly dampening windward areas. More widespread rainfall may develop early next week as winds remain strong and shift to the southeast.

DISCUSSION. Windy and locally wet trade wind weather will continue through the weekend, although shower frequency may be somewhat reduced today. The strong winds will shift slightly to the SE early next week, with increasing moisture potentially leading to more widespread clouds and showers from Sunday night into Wednesday.

A broad mid- and upper-level low is nearly stationary to the S of the area, with some of the associated layered clouds over the Big Island and parts of Maui. Cooler than normal mid-level temperatures associated with the low are supporting a somewhat unstable island atmosphere, with radar VWPs indicating the low-level moisture riding in on the trade flow extends as high as 10 thousand feet. With fresh to locally strong trade winds being supported by a 1035 mb high to the distant NE, orographic forcing is helping to generate showers over and immediately downstream of the terrain. Meanwhile, many leeward communities remain mostly dry.

While some drying of the upstream flow may lead to some reduction in windward shower frequency today, it is not expected to last long, and somewhat showery trade wind weather is anticipated over the weekend. Mid-level temperatures will remain cooler than normal, and strong trade winds will strengthen as the high to the distant NE moves closer to the islands. The high will be reinforced Saturday and Sunday, reaching a central pressure over 1040 mb, while a deep- layer low develops to the distant W and NW of the islands. A Wind Advisory may be required for parts of the state over the next couple of days, potentially as early as tonight.

The development of the low to the distant NW of the islands is expected to cause the winds to veer to the SE, while a moisture convergence band extending SE from the low creeps towards the islands from the S. Latest guidance indicates this band will move over portions of the islands from Monday into Wednesday - bringing PWAT close to 2", layered cloudiness, and widespread rainfall. Deep moisture and modest instability are expected, so the chance of thunderstorms appears too low to mention thus far. A drying trend is loosely expected thereafter as the band shifts W of the area. High pressure to the distant NE will continue to support locally strong trade winds.

AVIATION. Breezy to locally strong trades will persist through the forecast period. This will facilitate frequent windward showers and occasional leeward drift, particularly overnight. VFR is forecast to prevail at all forecast points with nothing more than brief MVFR within any heavier showers.

AIRMET Tango is in effect for mechanical lee turbulence below 9kft as well as for mod turbulence between FL250 and FL300.

MARINE. Surface high pressure is centered far to the north-northeast of the area, resulting in moderate to locally strong trade winds. The high will get a reenforcement beginning Saturday, causing trade winds to increase across the entire area through the first part of next week. This, combined with higher seas from both a large northwest swell and the trade wind seas, has prompted expansion of the current Small Craft Advisory to include all coastal waters.

A small northwest swell will linger today. Long-period forerunners from a larger west-northwest (310 degrees) swell will fill in late today and tonight. This swell is expected to peak Saturday with an 18 second period and high-end advisory or low-end warning level surf for most north and west facing shores of the smaller islands. The more westerly direction of this swell will allow west facing shores of the Big Island to experience advisory level surf, likely later in the day Saturday. Swell and surf will lower gradually Sunday and Monday, then become rather small for this time of year on Tuesday and Wednesday.

As the trades strengthen this weekend, rough and short-period surf will gradually rise and a High Surf Advisory is likely along east facing shores for several days, beginning Saturday afternoon.

Small, mainly background, southerly swells are expected over the next several days. A slightly larger, south-southwest swell from the Tasman sea is expected to gradually fill in Monday, peak Monday night and Tuesday, then lower Wednesday through Thursday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters.



DISCUSSION . Birchard AVIATION . JVC MARINE . TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi45 min E 14 G 20 75°F 78°F1014 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi45 min SSW 2.9 G 4.1 67°F 78°F1015.4 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi40 minNE 510.00 miA Few Clouds70°F65°F84%1014 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSE9NE7E7E3SE7S6S6SW8SW7SE6SE10SE7SE5NE3SE3SE3E5E6E7W3N3SE5SE6NE5
1 day agoN6E3SE3CalmS7SE9S12S11S8S11SW11SW15CalmSE4SE6CalmE5NE6NE7NE7NE5CalmNE4E3
2 days agoE4CalmSE9SE7SE7SW8SW6W9NW11NW13W12W9SW7S5SE10SE11
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Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Fri -- 12:17 AM HST     1.70 feet High Tide
Fri -- 01:51 AM HST     Moonset
Fri -- 07:00 AM HST     Sunrise
Fri -- 07:42 AM HST     0.70 feet Low Tide
Fri -- 10:35 AM HST     0.87 feet High Tide
Fri -- 01:24 PM HST     Moonrise
Fri -- 05:08 PM HST     0.13 feet Low Tide
Fri -- 06:10 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.71.51.41.10.90.80.70.70.80.80.90.80.70.50.30.20.10.20.30.611.31.6

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Fri -- 12:00 AM HST     1.65 feet High Tide
Fri -- 01:51 AM HST     Moonset
Fri -- 07:00 AM HST     0.67 feet Low Tide
Fri -- 07:00 AM HST     Sunrise
Fri -- 10:34 AM HST     0.83 feet High Tide
Fri -- 01:25 PM HST     Moonrise
Fri -- 05:04 PM HST     0.05 feet Low Tide
Fri -- 06:10 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.61.41.210.80.70.70.70.80.80.80.80.60.40.30.10.10.10.30.611.31.6

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




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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.