Sunday, April5, 2020
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Marine Weather and Tides
Koloa, 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 6:19AMSunset 6:49PM Sunday April 5, 2020 9:49 AM HST (19:49 UTC) Moonrise 4:49PMMoonset 4:56AM Illumination 95% 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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PHZ113 Kauai Channel- 930 Am Hst Sun Apr 5 2020
Rest of today..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Tonight..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Monday..South winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Scattered heavy showers in the morning. Slight chance of Thunderstorms through the day. Heavy showers likely in the afternoon.
Monday night..Southwest winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet. Heavy showers likely and slight chance of Thunderstorms.
Tuesday..West winds 10 knots. Wind waves 3 feet. Northwest swell 6 feet. Heavy showers likely and slight chance of Thunderstorms.
Tuesday night..West winds 10 knots. Wind waves 3 feet. Northwest swell 7 feet. Scattered showers.
Wednesday..West winds 10 knots. Wind waves 3 feet. Northwest swell 5 to 7 feet. Scattered showers.
Thursday..Northwest winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Northwest swell 4 to 5 feet. Isolated showers.
PHZ100 930 Am 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 southeasterly convergent flow setting up over the state will bring unsettled weather Monday and Tuesday.


7 Day Forecast for Marine Location Near Koloa, HI
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location: 21.9, -159.48     debug


Area Discussion for -
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FXHW60 PHFO 051946 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 946 AM 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 morning. Local land breezes were apparent overnight. Satellite loop shows scattered low clouds and mostly clear skies across most sections of the smaller islands. Patchy broken to overcast low clouds are noted across southeast facing shores and slopes of Maui and the Big Island. Additionally, broken high clouds attempt to obscure the view of lower clouds east of Oahu. Radar shows scattered showers moving into east and southeast facing slopes of Maui and the Big Island, with very little shower activity noted elsewhere.

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. There are also showers on the south/southeastern portions of the Big Island and the southeast waters. Expect similar conditions to yesterday where we have light winds and sea breeze development on the islands. Land breezes will develop tonight into Monday.

AIRMET Sierra is still in effect for the north through east sections of the Big Island as well as east sections of Maui, Molokai, and Lanai.

Turbulence models indicate moderate turbulence over the state from 23K to 30Kft and it looks as if this will be the case for at least a good portion of today, possibly into Monday.

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 late today or 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 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
NWWH1 - 1611400 - Nawiliwili, HI 8 mi50 min Calm G 1.9 75°F 79°F1015.2 hPa
51208 27 mi20 min 77°F7 ft
51201 - Waimea Bay, HI (106) 74 mi20 min 77°F5 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi57 minS 610.00 miFair77°F71°F82%1015 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI20 mi54 minSSE 910.00 miFair79°F66°F65%1014.4 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrS9S9S12S12S14S10S11S6S8N5Calm3W4W4W5W5W6W6W6W6W5W7W3S6
1 day agoS10S9S9S8S8S10S13S10S8S7S8S7S8S7S6S6S8S6CalmW3S7S6S5S8
2 days ago4E7SE8SE10----SE10SE10S8S5SE7SE7SE5SE8W7W5W6CalmW3S3CalmS7S9S11

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Sun -- 01:31 AM HST     1.60 feet High Tide
Sun -- 04:56 AM HST     Moonset
Sun -- 06:26 AM HST     Sunrise
Sun -- 08:27 AM HST     -0.17 feet Low Tide
Sun -- 02:07 PM HST     1.04 feet High Tide
Sun -- 04:49 PM HST     Moonrise
Sun -- 06:54 PM HST     Sunset
Sun -- 08:04 PM HST     -0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.61.61.41.10.70.30-0.2-0.100.30.70.9110.80.50.20-0.100.30.6

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Sun -- 01:40 AM HST     1.78 feet High Tide
Sun -- 04:55 AM HST     Moonset
Sun -- 06:25 AM HST     Sunrise
Sun -- 08:24 AM HST     -0.20 feet Low Tide
Sun -- 02:16 PM HST     1.12 feet High Tide
Sun -- 04:48 PM HST     Moonrise
Sun -- 06:53 PM HST     Sunset
Sun -- 08:01 PM HST     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.71.81.61.20.80.3-0-0.2-0.200.40.711.11.10.90.60.30-0.100.30.7

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 (15,3,4,5)
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Ground Weather Radar Station Kauai, HI
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weather_mapweather_map weather_map

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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.