Monday, April6, 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 6:08AMSunset 6:36PM Sunday April 5, 2020 6:53 PM HST (04:53 UTC) Moonrise 4:36PMMoonset 4:39AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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- 330 Pm Hst Sun Apr 5 2020
Tonight..West of the big island, south winds 10 knots backing east after midnight. NEar south point, east winds 15 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Northwest swell 3 feet. Scattered heavy showers through the day. Slight chance of Thunderstorms in the afternoon.
Monday night..West of the big island, winds variable less than 10 knots becoming southeast 10 knots after midnight. NEar south point, east winds 15 knots. Wind waves 4 feet. Northwest swell 3 feet. Scattered showers.
Tuesday..South winds 10 knots west of the big island...variable less than 10 knots near kawaihae. Wind waves 4 feet. Northwest swell 3 feet. Scattered heavy showers and slight chance of Thunderstorms.
Tuesday night..South winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Scattered showers.
Wednesday..South winds 10 knots. Wind waves 3 feet. Northwest swell 5 feet. Scattered showers.
Wednesday night..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Scattered showers.
Thursday..Winds variable less than 10 knots becoming southwest 10 knots in the afternoon, then becoming variable less than 10 knots. Wind waves 3 feet. Northwest swell 3 to 4 feet. Scattered showers.
Friday..Winds variable less than 10 knots becoming south 10 knots in the afternoon, then becoming variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
PHZ100 330 Pm Hst Sun Apr 5 2020
Synopsis for hawaiian coastal waters.. A boundary gradually moving towards the area from the northwest will keep the islands in a light to locally moderate wind pattern over the next several days. A broad area of south to southeast convergent flow setting up over the state will bring unsettled weather Monday and Tuesday.


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 060134 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 334 PM HST Sun Apr 5 2020

SYNOPSIS. A low to our northwest and a displaced ridge to our east will keep winds light across the islands through the week. Showers will favor mauka areas during the day and areas near the coast at night. Increased moisture will slide northward tonight through Tuesday, bringing the potential for locally heavy downpours and a few thunderstorms.

DISCUSSION. The pressure gradient between a low far northwest of Kauai and a ridge far northeast of Hilo remains slack, keeping winds quite light across the area this afternoon. Local sea breezes were apparent today given the low cloud distribution. Satellite loop shows patchy broken low clouds across mauka sections of all the islands. Additionally, broken high clouds attempt to obscure the view of lower clouds east of Oahu. Radar shows scattered to numerous showers across southeast facing shores and slopes of Maui and the Big Island, with additional showers forming across windward Oahu.

Models show the low northwest of the islands will gradually lift northeastward away from the state during the next couple of days, while the ridge to our northeast remains nearly stationary. A weakening frontal boundary will move into the western islands Monday night or Tuesday, then gradually dissipate as it drifts eastward across the chain through the remainder of the week. Frontal remnants may linger across the eastern end of the state into next weekend. Background wind flow will remain light, allowing development of local land and sea breezes.

Showers will continue to favor coastal areas at night and mauka areas during the day as an alternating pattern of land and sea breezes continues through the week. Increased moisture will be drawn northward over the islands tonight through Tuesday. Combined with troughing aloft, this increased moisture will broaden shower coverage and boost shower intensity statewide, with some locally heavy rainfall and even a few thunderstorms possible. Models suggest shower coverage will decrease over the western islands Wednesday through late next week as the deepest moisture shifts eastward.

AVIATION. Stalled or quasi-stationary boundary just to the northwest of Kauai will give Kauai and possibly Oahu the chance for clouds and showers, most likely Monday afternoon into the overnight hours. A few showers have popped up on the inner portions of the Big Island this afternoon but they should dissipate after sunset. Land breezes will develop tonight into Monday again.

AIRMET Sierra is still in effect for the north through east sections of the Big Island as well as east sections of Maui. Will add Lanai and Molokai back into that AIRMET.

Turbulence models indicate moderate turbulence over the state from 23K to 30Kft and it looks as if this will be the case until at least this evening.

MARINE. The current light to locally moderate wind regime is expected to persist through early this week. The overall background flow will generally be from the southeast to south as a boundary slowly approaches the area from the northwest. As it approaches, a broad area of convergent southeast to south flow is expected to set up over the state tonight, extending through Tuesday. This will likely result in a period of unsettled weather with locally heavy rainfall, and possibly thunderstorms. With seas and swells expected to stay below Small Craft Advisory thresholds for much of the upcoming week, the main threat to mariners will be associated with any thunderstorm development.

The new north-northwest swell has peaked and is expected to steadily decrease through the rest of the day. As this swell lowers, a new 3- to 4-foot long-period west-northwest swell will slowly begin to fill in tonight. This swell is expected to peak Monday night and will be followed by a moderate northwest swell arriving late Tuesday. This second swell should be slightly larger and is expected to peak Tuesday night or early Wednesday. Surf is expected to remain below the High Surf Advisory criteria along north and west facing shores with these swells.

A series of small south to south-southeast swells are expected during the upcoming week. Surf is expected to reach the summer average by Tuesday, followed by another small pulse later this week. Surf along east facing shores will remain small through the upcoming week due to the lack of trades.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Powell AVIATION . Chevalier MARINE . Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 28 mi54 min W 5.1 G 5.1 76°F 79°F1012.1 hPa (-0.5)
ILOH1 - 1617760 - Hilo, HI 50 mi54 min Calm G 1.9 73°F 77°F1012 hPa (+0.6)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi54 min N 1.9 G 4.1 76°F 78°F1012.5 hPa (-0.0)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi61 minNW 910.00 miMostly Cloudy78°F69°F74%1012.2 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrS8S9SE3SE3SE5CalmSE5SE5CalmE5E4E4NE4N7NW7NW8NW9NW13NW15NW12NW11NW10N8NW9
1 day agoN7N6N6N5NE5CalmNE3NE4SE4E3E3E4E3CalmSW5SW8SW9S11SW11SW10SW10S10SW9S8
2 days agoSE11SE10SE7SE7SE7SE9SE6E4E4E7E5NE7N6N10N13NW11NW10NW10NW10NW8NW11NW10NW10NW7

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 02:29 AM HST     1.93 feet High Tide
Mon -- 05:24 AM HST     Moonset
Mon -- 06:12 AM HST     Sunrise
Mon -- 09:00 AM HST     -0.20 feet Low Tide
Mon -- 03:05 PM HST     1.60 feet High Tide
Mon -- 05:39 PM HST     Moonrise
Mon -- 06:39 PM HST     Sunset
Mon -- 09:04 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.71.91.91.71.20.70.3-0.1-0.2-0.10.20.71.11.51.61.51.20.80.40.1-00.10.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Mon -- 02:55 AM HST     2.23 feet High Tide
Mon -- 05:24 AM HST     Moonset
Mon -- 06:11 AM HST     Sunrise
Mon -- 09:22 AM HST     -0.14 feet Low Tide
Mon -- 03:28 PM HST     1.86 feet High Tide
Mon -- 05:39 PM HST     Moonrise
Mon -- 06:39 PM HST     Sunset
Mon -- 09:25 PM HST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.82.12.22.11.71.10.60.1-0.1-0.10.20.71.21.61.81.81.61.10.70.3000.3

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
Wind Forecast for (0,6,7,8)
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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.