Wednesday, April8, 2020
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Marine Weather and Tides
Manele, 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 6:16AMSunset 6:49PM Wednesday April 8, 2020 8:37 AM HST (18:37 UTC) Moonrise 7:54PMMoonset 7:00AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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PHZ118 Maui County Leeward Waters- 315 Am Hst Wed Apr 8 2020
Today..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Tonight..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
Thursday..Winds variable less than 10 knots becoming west 10 knots in the afternoon. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Scattered showers.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 5 feet. Scattered showers.
Friday night..Winds variable less than 10 knots becoming southwest 10 knots after midnight. Wind waves 2 feet or less. North swell 5 feet. Scattered showers.
Saturday..West winds 10 knots becoming variable less than 10 knots. Wind waves 2 feet or less. North swell 3 to 5 feet. Scattered showers.
Sunday..Northeast winds 10 knots. Wind waves 3 feet. North swell 3 to 4 feet. Isolated showers.
PHZ100 315 Am Hst Wed Apr 8 2020
Synopsis for hawaiian coastal waters.. A dissipating front will moving down the western end of the island chain will diminish by Thursday. Another weak front is expected to reach the islands Saturday night and Sunday. High pressure will build north of the area Sunday into next week following the front.


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 081333 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 333 AM HST Wed Apr 8 2020

SYNOPSIS. Light and variable winds will persist through the week. A trough stalled over the islands will provide partly cloudy skies and scattered showers into the weekend. Trade winds may return by the end of the weekend and next week.

DISCUSSION. A weak surface trough over the eastern third of the state is focusing showers over southeast portions of the Big Island and adjacent waters this morning. Satellite loop shows scattered to patchy broken low clouds across the smaller islands, while broken to overcast low clouds cover much of the Big Island. Outside of the Big Island, radar shows little shower activity. The surface trough and weak background flow will allow development of afternoon sea breezes and nighttime land breezes through the week. Expect afternoon convective clouds with embedded showers to pop up mainly over interior areas.

A weak frontal boundary moving in from the northwest today will join with the trough and add increased low level moisture to the mix. This will increase shower coverage a notch with a focus over the central islands. However, warming is expected aloft into Thursday, so heavy rainfall is not expected during this time frame. Temperatures aloft are expected to cool again Friday as a short wave upper trough moves through, bringing the potential of more vigorous showers into Saturday.

Models depict a weak cold front reaching Kauai Saturday and stalling over the central islands Sunday, bringing increased clouds and showers. High pressure behind the front will swing winds around to light northwesterlies Saturday and moderate northeast trade winds on Sunday that may continue into next week.

AVIATION. A dissipating cold front approaching the state from the northwest will stall out over maui or oahu later today. Isolated to scattered showers this morning will increase in both coverage and intensity this afternoon. Locally heavy downpours possible over island interiors this afternoon, especially Interior Big Island.

Weak south to southeast flow ahead of the front is steering multiple bands of showers towards south and southeast facing slopes and coasts of the Big Island this morning. Conditions are expected to improve as winds shift southwestward. AIRMET Sierra for mountain obscuration will likely be cancelled later this morning.

MARINE. Low pressure centered far north of the state will maintain mainly light to gentle winds over the coastal waters into Saturday. For the western end of the state, the background flow will remain out of the west through Thursday, then shift out of the west- southwest Friday and Friday night as another front approaches. For the eastern end of the state, the background flow will remain out of the south through Friday, then shift out of the southwest Friday night into Saturday. The front will move down the island chain late Saturday into Sunday with moderate northerly winds filling in following its passage. A return of a more typical trade wind pattern is expected Sunday night into early next week as high pressure builds north of the area.

Surf along north and west facing shores will remain up each day into early next week due to pulses of energy moving through periodically from a nearly stationary area of low pressure centered around 1000 NM north-northwest of the islands. The longer-period, northwest swell mixed in will steadily fade through the day today. The next northerly pulse is expected Thursday night through Friday (6 ft at 12 seconds) before easing over the weekend. Guidance shows the area low pressure beginning to slowly lift north-northeastward over the weekend and weakening. As it does, one last northerly pulse is shown arriving late Monday through Tuesday.

For the extended, guidance shows a gale- to storm-force low evolving over the far northwest Pacific this weekend as it tracks northeastward from Japan toward the Aleutians. Decent agreement between the various model solutions is shown, which depicts a decent sized area of gales associated with this feature focused at the local area within the 300 to 320 degree bands with seas climbing into the 20-30 ft range. If this scenario materializes, a long-period, west-northwest swell will build down the island chain Tuesday night through Wednesday.

Surf along south and east facing shores will remain rather small through the Friday. Mainly background south to south-southeast swells will affect south facing shores. A slight upward trend is possible through the upcoming weekend as a small south swell fills in. Although a small southwest pulse from Tropical Cyclone Harold that just passed south of Fiji will be possible over the upcoming weekend, its fast southeast track will be a limiting factor - lowering forecast confidence. For the long-term, guidance depicts a solid area of gales setting up in the Tasman Sea over the upcoming weekend driving seas into the 20-30 ft range. If this materializes, a south-southwest swell will become a possibility the following weekend locally (April 17th- 19th).

With trades disrupted locally and the trade wind fetch east of the islands suppressed, surf along east facing shores will be well below the April normal. East shore surf is expected to build early next week with trades forecast to return.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Powell AVIATION . Bedal MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 32 mi38 min 77°F3 ft
OOUH1 - 1612340 - Honolulu, HI 46 mi56 min N 2.9 G 5.1 73°F 78°F1015.7 hPa
51211 47 mi68 min 77°F2 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI35 mi42 minE 310.00 miOvercast70°F0°F%1015.7 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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W8W8NW7NW7NW4W3NE4N4NW4NE6E3CalmCalmE3NE3CalmE4E3
1 day agoS9S9S11SW11S12SW12SW11S14SW12SW13S4S8SW7S5SW7SW7W4CalmE5E4E4SE3E4S5
2 days agoE9SE6SE7S8S6S9S7S6S6SW6S4S4E4E4E5E6E6E7E6E5E5E7S6Calm

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Wed -- 04:11 AM HST     1.61 feet High Tide
Wed -- 06:14 AM HST     Sunrise
Wed -- 06:57 AM HST     Moonset
Wed -- 10:21 AM HST     -0.34 feet Low Tide
Wed -- 04:58 PM HST     2.04 feet High Tide
Wed -- 06:44 PM HST     Sunset
Wed -- 07:52 PM HST     Moonrise
Wed -- 11:22 PM HST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.61.11.41.61.51.20.80.3-0.1-0.3-0.300.511.61.921.91.61.10.60.20

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Wed -- 04:14 AM HST     1.41 feet High Tide
Wed -- 06:14 AM HST     Sunrise
Wed -- 06:58 AM HST     Moonset
Wed -- 10:19 AM HST     -0.34 feet Low Tide
Wed -- 05:01 PM HST     1.84 feet High Tide
Wed -- 06:45 PM HST     Sunset
Wed -- 07:53 PM HST     Moonrise
Wed -- 11:20 PM HST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.60.91.21.41.31.10.70.2-0.1-0.3-0.3-00.40.91.41.71.81.71.410.50.20

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 (14,3,4,5)
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Ground Weather Radar Station Molokai, 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.