Sunday, March29, 2020
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Marine Weather and Tides
Wainaku, 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 6:14AMSunset 6:35PM Sunday March 29, 2020 5:42 PM HST (03:42 UTC) Moonrise 9:52AMMoonset 11:20PM Illumination 35% 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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PHZ122 Big Island Windward Waters- 333 Pm Hst Sun Mar 29 2020
Tonight..East winds 20 knots. Wind waves 6 feet. Chance of Thunderstorms in the evening. Scattered showers through the night. Slight chance of Thunderstorms after midnight.
Monday..East winds 15 knots. Wind waves 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..East winds 10 knots. Wind waves 5 feet. Scattered showers.
Tuesday..East winds 10 knots. Wind waves 5 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 5 feet. Northwest swell 3 feet. Scattered showers.
Wednesday night..East winds 15 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers.
Thursday..Southeast winds 10 knots. Wind waves 5 feet. Northwest swell 3 feet. Showers likely.
Friday..Southeast winds 10 knots becoming variable less than 10 knots. Wind waves 4 feet. Northwest swell 3 to 4 feet. Showers likely.
PHZ100 333 Pm Hst Sun Mar 29 2020
Synopsis for hawaiian coastal waters.. High pressure northeast 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 Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 300208 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 408 PM HST Sun Mar 29 2020

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. A bit of a drying trend tonight and 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 surface high pressure cell centered far N of the islands. Water vapor imagery highlights an E-W oriented trough aloft just N of the islands along 24N, with a low aloft centered about 600 miles NE of the islands near 27N 150W. Model analyses indicate that a jet maximum on the S side of the low is just NE of the islands, with the associated divergence aloft responsible for fueling heavy showers and thunderstorms over waters E of Maui and the Big Island today. In fact, particularly strong thunderstorms have periodically displayed supercell characteristics just E of the Big Island windward coastal waters through the day today. The jet max also helped to fuel some locally heavy showers over the islands, but is departing the area to the E, taking the threat of heavy showers and thunderstorms (for most areas save the Big Island and adjacent windward waters this evening) with it. Therefore, the Flash Flood Watch for Kauai county was cancelled a little while ago.

With the jet max departing, and subtle warming in the mid-levels tonight and Monday, the atmosphere will stabilize slightly. While the potential for thunderstorms and widespread heavy rainfall will diminish, some briefly heavy showers might still occur. Light to moderate trade winds are expected to deliver otherwise brief windward showers as the surface high moves to a position NE of the islands and the corresponding ridge extends N of the islands. Leeward areas will continue mostly dry.

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 once again. A front passing well N of the islands will force the ridge southward toward the islands starting Wednesday, leading to a weakening trade wind flow. Winds are expected to become light and variable Thursday and Friday as the ridge moves over the islands. 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 trough aloft, with the potential for thunderstorms also increasing. Confidence is not overwhelmingly high, but these elements have been added to the forecast for Wednesday.

Deep-layer low pressure developing N of the islands Friday into next weekend introduces a significant amount of uncertainty to the forecast as an associated convergence band may be near the islands.

AVIATION. The airmass over the state remains unstable, but mid-level ridging is expected to result in an inversion aloft by late evening. Isolated heavy showers and thunderstorms should end towards evening but will linger over the Big Island for several hours longer. Partial clearing expected across Leeward Coasts after midnight.

Meanwhile, moderate to locally breezy trade wind flow will carry bands of moisture towards the islands. Overnight, clouds and showers will favor north and east facing slopes and coasts. AIRMET Sierra for mountain obscuration across Windward Big Island will likely remain necessary through the remainder of today and possibly overnight.

AIRMET Tango for low level turbulence has been cancelled due to insufficient winds and the lack of an inversion at summit level, but favorable conditions could redevelop Monday afternoon.

MARINE. Moderate to locally 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, but winds are expected to taper off Monday through midweek as the driving high pressure system to the northeast moves away from the area. The High Surf Advisory that was in effect for east facing shores today has been cancelled as local wind waves have lowered.

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



DISCUSSION . Birchard AVIATION . Bedal MARINE . Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi54 min W 1.9 G 4.1 69°F 76°F1014.8 hPa
51206 6 mi56 min 75°F8 ft
KWHH1 46 mi54 min W 5.1 G 7 77°F 79°F1013.8 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi49 minSW 56.00 miLight Rain Fog/Mist71°F66°F87%1016.5 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrE14CalmSW4W4N10W3CalmSE3W4SW4W4W5W4S3W5CalmS7NW6SE3NE12E5NE5S8SW5
1 day agoW3W7SW6SW5SW73W6SW7W6NW5NW5SW5SW3CalmE6Calm3E6
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2 days agoSW5W5SW4SW7W4CalmNW3SW8SW6SW7SW6SW7SW5W3Calm4SE10S6N5SE4CalmCalmCalmCalm

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sun -- 01:54 AM HST     0.56 feet Low Tide
Sun -- 06:18 AM HST     Sunrise
Sun -- 06:36 AM HST     1.01 feet High Tide
Sun -- 09:54 AM HST     Moonrise
Sun -- 12:29 PM HST     0.18 feet Low Tide
Sun -- 06:37 PM HST     Sunset
Sun -- 07:57 PM HST     1.95 feet High Tide
Sun -- 11:23 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.60.60.60.80.9110.90.70.50.30.20.20.30.611.31.71.91.91.91.71.4

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 (23,6,7,8)
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Ground Weather Radar Station Kohala, 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.