Monday, August3, 2020
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Marine Weather and Tides
Kekaha, 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 6:05AMSunset 7:11PM Monday August 3, 2020 8:01 AM HST (18:01 UTC) Moonrise 7:20PMMoonset 5:38AM Illumination 100% Phase: Full Moon; Moon at 14 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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7 Day Forecast for Marine Location Near Kekaha, HI
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location: 23.78, -166.22     debug


Area Discussion for -
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FXHW60 PHFO 031354 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 354 AM HST Mon Aug 3 2020

SYNOPSIS. Surface high pressure far north of the state will produce moderate to locally breezy trade winds through next weekend. A fairly dry trade wind weather pattern is expected early this week. An upper-level disturbance passing near the islands combined with increasing moisture around mid-week may cause an uptick in showers over most windward sections from Wednesday through Friday. Expect a more typical dry trade wind weather to return by next weekend.

DISCUSSION. An east to west oriented surface ridge is almost 1100 miles north of Honolulu. In addition, there is an east-northeast to west- southwest oriented surface tough about 500 miles south of South Point on the Big Island. Since the islands are sandwiched between these two features, the pressure gradient remains relatively tight across the region. This is maintaining moderate to locally breezy trade winds across the main Hawaiian Islands early this morning.

Loops of water vapor imagery depict an upper-level trough northwest of the islands. Southerly flow aloft along the eastern flank of this feature is transporting a band of cirrus clouds, which consist of small ice crystals, above the western end of the island chain this morning. Satellite imagery and radar reflectivities also show scattered to broken low clouds with embedded showers being transported by the low-level trade wind flow toward the windward sides of most of the islands.

The early morning balloon soundings from Lihue and Hilo indicated stable atmospheric conditions persist with a strong trade wind inversion of 6 to 7 thousand feet. In addition, the precipitable water (PW) values were 1.1 to 1.2 inches. This is below the typical August PW values of around 1.35 inches, so the atmosphere remains somewhat drier than normal in the vicinity of the state.

The forecast models indicate surface high pressure will remain far north of the state for the next several days. This will likely produce moderate to locally breezy trade winds through next weekend. The models also suggest the current relatively dry trade wind weather pattern will persist for the next couple of days. However, pockets of slightly greater moisture being carried by the trades will continue to produce some low clouds and brief showers over windward sections through Tuesday, especially at night and during the early morning hours.

By mid-week, the forecast guidance continues to depict a weak mid-level trough passing from east to west in the vicinity of the islands. This might cause a slight destabilization of the atmosphere. In addition, areas of slightly enhanced moisture may move in from the east, which would likely increase the PW values, as well as the dew point temperatures. The result may be a noticeable uptick in showers, especially over windward facing slopes from Wednesday into Friday. Upslope sections of the leeward Big Island could also see some rainfall each afternoon. Finally, the higher dew point temperatures may make the air feel warmer than normal, even with the locally breezy trades. By next weekend, the forecast models show a return to a more typical dry trade wind pattern with mainly brief windward showers next Saturday and Sunday.

AVIATION. A stable, moderate to breezy trade wind flow will persist as high pressure remains anchored far north of the state. Brief MVFR conditions will develop along windward slopes as pockets of moisture ride along the trades. VFR conditions will dominate over leeward areas, though the Kona slopes of the Big Island will experience MVFR ceilings and reduced visibility in SHRA each afternoon.

AIRMET TANGO for turbulence remains in effect below 8,000 feet over and immediately south through west of mountains.

MARINE. A surface ridge will remain far N of the islands throughout the forecast period, supporting locally strong trade winds. A Small Craft Advisory is currently posted for the typically windy waters around Maui County and the Big Island through Tuesday, and will likely need to be extended.

There will be small long-period S swells arriving through the week, with surf heights remaining below advisory levels. There will also be a short-period SE swell that will linger through the week, keeping surf slightly elevated along exposed shorelines. Easterly trade winds will continue to produce short-period choppy surf along E facing shores. A small NNE swell will linger today before diminishing, with an even smaller NNW swell possible around Thursday/Friday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Tuesday for Maalaea Bay, the Pailolo and Alenuihaha Channels, and the waters south of the Big Island.



DISCUSSION . Houston AVIATION . TS MARINE . Birchard


Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for East Island, French Frigate Shoals
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East Island
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Mon -- 03:52 AM HST     0.61 feet High Tide
Mon -- 05:59 AM HST     Full Moon
Mon -- 06:35 AM HST     Sunrise
Mon -- 06:37 AM HST     Moonset
Mon -- 09:14 AM HST     0.02 feet Low Tide
Mon -- 04:30 PM HST     1.73 feet High Tide
Mon -- 07:46 PM HST     Sunset
Mon -- 08:19 PM HST     Moonrise
Mon -- 11:44 PM HST     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.50.60.60.60.40.30.100.10.20.50.91.31.51.71.71.61.310.60.40.2

Tide / Current Tables for
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Weather Map
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (14,3,4,5)
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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.