Saturday, December14, 2019
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Marine Weather and Tides
Manele, HI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:59AMSunset 5:52PM Saturday December 14, 2019 6:37 PM HST (04:37 UTC) Moonrise 8:39PMMoonset 9:23AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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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PHZ180 Hawaiian Offshore Waters- 523 Pm Hst Sat Dec 14 2019
Tonight..NW half, E winds 10 to 20 kt. SE half, E winds 15 to 25 kt. Seas 8 to 10 ft.
Sunday..NW half, ne to E winds 10 to 15 kt. SE half, E winds 10 to 20 kt. Seas 7 to 9 ft.
Sunday night..E of 154w, ne winds 10 to 15 kt. W of 154w, ne winds 15 to 20 kt. Seas 8 ot 11 ft.
Monday..E winds 15 to 25 kt. Seas 8 to 12 ft.
Monday night and Tuesday..E winds 15 to 30 kt, strongest S of 20n. Seas 9 to 12 ft.
Wednesday..N of 22n, E winds 15 to 20 kt. S of 22n, E winds 20 to 25 kt. Seas 8 to 11 ft.
Thursday..E to ne winds 15 to 25 kt. Seas 8 to 11 ft.
PHZ100 316 Pm Hst Sat Dec 14 2019
Synopsis for hawaiian coastal waters.. High pressure will keep locally strong trade winds across the coastal waters tonight. A slight decline in trades is expected Sunday, before a new high builds north of the area and trades return to locally strong speeds by early next week. A large northwest swell will arrive at the beginning of next week.


7 Day Forecast for Marine Location Near Manele, HI
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location: 20.67, -157.6     debug


Area Discussion for -
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FXHW60 PHFO 150150 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 350 PM HST Sat Dec 14 2019

SYNOPSIS. Trade winds will diminish somewhat tonight and Sunday, but will increase Monday and Tuesday before easing Wednesday. The trade winds will continue through the week, delivering low clouds and showers to windward areas through the week, but their coverage and intensity is expected to be limited Monday and Tuesday as the island atmosphere becomes very stable.

DISCUSSION. Trade winds (at times strong) dominate the forecast through the upcoming week, supported by a trio of high pressure cells moving rapidly eastward across the N Pacific. The first high is centered far NE of the islands and moving steadily E, with some easing of today's breezy trade winds expected tonight and Sunday as a weakness in the ridge passes N of the islands. Supporting this notion is the fact that surface pressures across the islands are down ~2 mb over the past 24 hours. A second high will build N of the islands Sunday night/Monday, leading to increased trade winds until another weakness in the ridge passes to the N around Wednesday. A third high is expected to pass N of the islands Thursday/Friday, likely bringing another period of locally strong trade winds heading into next weekend.

A low aloft centered several hundred miles W of the islands is embedded within a NE-SW oriented trough, with the trough axis located several hundred miles N of Kauai. SW flow aloft is bringing diminishing high clouds over the islands, although they have been especially thick over Oahu today. As the low weakens and the trough moves S over the next 12 to 24 hours, high clouds will diminish further, lingering over the Big Island Sunday before finally moving E of all islands as a strong ridge aloft builds in from the W.

Although the low and trough aloft do not appear to be significantly destabilizing the island atmosphere (with afternoon soundings depicting a subsidence inversion based near 8000 feet), visible satellite images show an abundance of open-celled showery low clouds approaching from the E in the trade wind flow. It looks as though most windward areas should expect some rainfall overnight, with a few showers spreading leeward on the smaller islands. Forecast models indicate showery low clouds will continue to move over the islands with the trade flow through the forecast period, but they are expected to diminish in coverage and intensity as the ridge aloft builds over the area Monday and Tuesday. Current forecast grids feature reduced PoPs / light showers for this time period due to the increased stability, reverting back to a climo forecast thereafter as the strong ridge aloft weakens somewhat. A rather wet solution for next weekend is noted with the 12Z/18Z GFS as a shortwave trough aloft passes overhead, but 12Z ECMWF guidance keeps the trough W of the islands. Both models portend a front approaching from the NW at some point next weekend however.

AVIATION. A 1028 mb surface high far northeast of the state will allow moderate to occasionally breezy trades to persist through through tonight. This could lead to moderate turbulence on the lee side of the local mountains. Thus, isolated to scattered showers will affect mainly windward areas. This activity has the potential to bring periodic MVFR conditions and mountain obscurations to the windward side of the islands.

AIRMET TANGO remains in effect over and immediately south thru west of mountains on all islands below 9000 feet due to tempo moderate turbulence.

MARINE. Current northwest and northeast swells will lower through tonight. A long period northwest swell is expected to build late Sunday, peaking Monday and Monday night bringing surf around warning levels along exposed north and west facing shores. This swell should slowly decline Tuesday night into Wednesday. Another northwest swell will build Wednesday night into Thursday, then decline Friday into the weekend.

High pressure north of the state will keep strong trade winds over the area tonight with a gradual taper off expected into Sunday. A Small Craft Advisory is posted for all coastal waters through tonight and may need to be extended for some areas into Sunday. Trades will boost back to strong breezes by Monday through at least midweek. Seas will also increase early next week due to the combination of swell and winds.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Sunday for all Hawaiian waters.

DISCUSSION . Birchard AVIATION . Thomas MARINE . Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 32 mi67 min 81°F4 ft
OOUH1 - 1612340 - Honolulu, HI 46 mi55 min ENE 6 G 9.9 77°F 80°F1014.1 hPa
51211 47 mi67 min 80°F3 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI35 mi41 minNNE 710.00 miOvercast74°F70°F88%1013.9 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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Last 24hrE4E3N6NE8N9E8NE6E3NE9NE7NE10N10N4Calm6CalmW4W8SW10W8W64W6N7
1 day agoE5NE11E9E7NE7NE4NE3E4E6--NE7NE4NE6NE7NE8NE9W6W7W6W6W10CalmW6S4
2 days agoW5CalmNE6NE6NE5E5E4E5--E5--N4N3N6N64W7SW7SE86SW7NW7N3NE8

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Sat -- 05:49 AM HST     2.62 feet High Tide
Sat -- 06:55 AM HST     Sunrise
Sat -- 09:20 AM HST     Moonset
Sat -- 01:22 PM HST     0.22 feet Low Tide
Sat -- 05:49 PM HST     Sunset
Sat -- 05:50 PM HST     0.86 feet High Tide
Sat -- 08:36 PM HST     Moonrise
Sat -- 10:55 PM HST     0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.71.21.82.22.52.62.52.11.61.10.70.40.20.30.40.60.80.90.80.60.30.10.1

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Sat -- 05:52 AM HST     2.42 feet High Tide
Sat -- 06:57 AM HST     Sunrise
Sat -- 09:21 AM HST     Moonset
Sat -- 01:20 PM HST     0.22 feet Low Tide
Sat -- 05:49 PM HST     Sunset
Sat -- 05:53 PM HST     0.66 feet High Tide
Sat -- 08:36 PM HST     Moonrise
Sat -- 10:53 PM HST     0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.61.11.62.12.32.42.321.510.60.40.20.20.40.50.60.70.60.40.30.10.1

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 Molokai, 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 numerious 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.