Sunday, March29, 2020
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Marine Weather and Tides
Hanamaulu, 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 6:25AMSunset 6:47PM Sunday March 29, 2020 1:46 PM HST (23:46 UTC) Moonrise 10:06AMMoonset 11:42PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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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PHZ111 Kauai Windward Waters- 927 Am Hst Sun Mar 29 2020
Rest of today..East winds 20 knots. Wind waves 8 feet. Scattered heavy showers and slight chance of Thunderstorms.
Tonight..East winds 15 knots. Wind waves 7 feet. Slight chance of Thunderstorms in the evening. Scattered showers through the night.
Monday..East winds 15 knots. Wind waves 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..East winds 15 knots. Wind waves 6 feet. Scattered showers.
Tuesday..East winds 10 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..East winds 10 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers.
Wednesday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Scattered showers.
Thursday..East winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 to 4 feet. Northwest swell 3 feet. Scattered showers.
PHZ100 927 Am Hst Sun Mar 29 2020
Synopsis for hawaiian coastal waters.. High pressure north of the islands will weaken as it slides eastward through midweek. This will lead to a gradual easing of the trade winds across the marine area. A trough aloft over the islands will keep a slight chance of Thunderstorms in place through this evening. The trough will redevelop over the state Tuesday and Wednesday.


7 Day Forecast for Marine Location Near Hanamaulu, HI
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location: 22, -159.33     debug


Area Discussion for -
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FXHW60 PHFO 292156 CCA AFDHFO

Area Forecast Discussion . corrected National Weather Service Honolulu HI 1000 AM HST Sun Mar 29 2020

CORRECTED W/W/A SECTION

SYNOPSIS. Light to moderate trade winds will continue for the next couple of days, delivering clouds and showers that will primarily focus over windward areas. The island atmosphere will remain somewhat unstable today, so some of the showers could be briefly heavy, with the potential for a thunderstorm, especially over the Big Island slopes this afternoon. A bit of a drying trend on Monday is expected to be short-lived, with windward showers likely increasing again on Tuesday and Wednesday. An approaching front will bring light winds Thursday and Friday, which will likely allow showers to develop over interior and upslope areas in the afternoons.

DISCUSSION. Currently, moderate to locally breezy trade winds are being supported by a high pressure cell centered far N of the islands. An E-W oriented trough aloft is just N of the islands, and overnight soundings show that the island atmosphere is quite unstable as a result. Latest radar and satellite images show heavy rain cores embedded within the clouds moving toward the islands with the trade wind flow. As these clouds grow in response to the instability, westerly winds above 15 thousand feet can be seen blowing their tops back toward the E. Although the greatest conglomeration of moisture is currently over waters E of Maui and the Big Island, and the chance of a briefly heavy downpour is about the same statewide today, a Flash Flood Watch (FFA) for Kauai county remains posted due to the saturated soils, especially in windward Kauai. Most showers should move steadily W with the trades, thereby reducing the threat of significant flooding, except that the forward motion of some of the deeper convection will slow as it interacts with the westerly flow aloft.

The forecast for today was updated to increase expected rain and thunderstorm chances over the Big Island this afternoon, and to include winter weather over the Big Island summits as deep convection is expected to develop over the slopes. Otherwise, expect some briefly heavy downpours, mainly over windward areas, but if trades succumb to leeward sea breezes this afternoon on the smaller islands, a leeward shower can't be ruled out.

Warming in the mid-levels tonight and Monday will allow the atmosphere to stabilize somewhat, with diminishing chances for heavy showers and thunderstorms. Light to moderate trade winds will deliver brief windward showers as the surface high moves to a position NE of the islands and the corresponding ridge extends N of the islands. Another trough aloft is expected to approach Tuesday, move over the islands Tuesday night and Wednesday, then linger into Thursday, acting to destabilize the atmosphere. A front passing well N of the islands will force the ridge southward over the islands starting Wednesday, with winds becoming light and variable Thursday and Friday. Shower chances will be greatest over windward areas while trades persist, but as winds weaken, the greatest rain chances will likely shift to interior and upslope areas. Some showers could be heavy due to the nearby trough.

Deep-layer low pressure developing N of the islands next weekend complicates the forecast and introduces a large amount of uncertainty as an associated convergence band may be near the islands.

AVIATION. The airmass over the state remains unstable. Expect a slight chance of thunderstorms or heavy showers for all islands beginning this afternoon. Across Leeward and Interior Big Island, afternoon sea breezes will combine with abundant moisture and cold temperatures aloft to create widespread shower activity with possible embedded thunderstorms.

Otherwise, strong surface high pressure far to the north and northeast of the state will continue to promote moderate to locally strong trade winds across the islands. Multiple bands of showers will favor east and northeast facing slopes and coast. Brief spillover showers can be expected across the leeward slopes of the smaller islands, especially in the morning. AIRMET Sierra for mountain obscuration across Windward slopes will likely be lifted around midday in response to daytime heating.

Later today, mid level ridging is expected to build over the state resulting in an inversion aloft around 8kft by late evening. A few locally heavy showers will still be possible over Kauai overnight, but the general trend will be towards increased air mass stability statewide.

MARINE. Moderate to fresh trade winds will continue across the island chain through tonight. A Small Craft Advisory (SCA) is in effect for the typically windy waters around Maui and the Big Island. Trade winds will taper off Monday as the driving high pressure system to the north weakens. A High Surf Advisory for east facing shores remains in effect through today due to local and upstream trade winds, with a gradual trend down in surf heights expected this week as winds weaken.

A small west northwest swell is expected to give surf a boost along north and west facing shores Tuesday through Thursday. Small south and south southwest swells will continue to keep some surf in place through the week along south facing shores, with a slightly larger south southeast swell expected boost surf heights a bit Wednesday night through Friday night.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for East facing shores of Kauai Oahu Molokai Maui and the Big Island.

Small Craft Advisory until 6 AM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

Flash Flood Watch until 6 PM HST this evening Niihau-Kauai.



DISCUSSION . Birchard AVIATION . Bedal MARINE . Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 3 mi46 min ENE 14 G 17 74°F 77°F1017.8 hPa
51208 24 mi16 min 76°F6 ft
51201 - Waimea Bay, HI (106) 68 mi46 min 76°F5 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI2 mi53 minENE 1410.00 miMostly Cloudy80°F70°F71%1017.7 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrE14E16E15NE13E14E16NE16NE15E15E17E15E15NE18E18NE15E15E14E17E17E14E13NE14NE11E14
1 day agoNE11NE14NE10E14
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Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Sun -- 01:52 AM HST     0.44 feet Low Tide
Sun -- 06:15 AM HST     0.59 feet High Tide
Sun -- 06:32 AM HST     Sunrise
Sun -- 10:05 AM HST     Moonrise
Sun -- 12:06 PM HST     0.09 feet Low Tide
Sun -- 06:51 PM HST     Sunset
Sun -- 07:55 PM HST     1.45 feet High Tide
Sun -- 11:41 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Sun -- 01:51 AM HST     0.37 feet Low Tide
Sun -- 05:56 AM HST     0.59 feet High Tide
Sun -- 06:33 AM HST     Sunrise
Sun -- 10:06 AM HST     Moonrise
Sun -- 12:05 PM HST     0.08 feet Low Tide
Sun -- 06:52 PM HST     Sunset
Sun -- 07:36 PM HST     1.32 feet High Tide
Sun -- 11:42 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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 (19,4,5,8)
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Ground Weather Radar Station Kauai, HI
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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.