Monday, January20, 2020
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Marine Weather and Tides
Heeia, 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 7:10AMSunset 6:14PM Monday January 20, 2020 1:03 PM HST (23:03 UTC) Moonrise 3:34AMMoonset 2:51PM Illumination 19% Phase: Waning Crescent; Moon at 25 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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PHZ116 Kaiwi Channel- 1001 Am Hst Mon Jan 20 2020
.small craft advisory in effect through late this afternoon...
Rest of today..East winds to 25 knots. Wind waves 8 feet. North swell 6 feet. Scattered showers late in the morning. Isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 6 feet. Northwest swell 5 feet. Isolated showers.
Tuesday..Southeast winds 20 knots veering southwest in the afternoon. Wind waves 6 feet. Northwest swell 4 feet. Isolated showers in the morning.
Tuesday night..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 4 feet.
Wednesday..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 6 feet increasing to 9 feet in the afternoon.
Wednesday night..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 13 feet.
Thursday..Winds variable less than 10 knots. Wind waves 3 feet. Northwest swell 10 to 12 feet.
Friday..Winds variable less than 10 knots becoming northeast 15 knots. Wind waves 3 to 4 feet. Northwest swell 9 to 11 feet.
PHZ100 1001 Am Hst Mon Jan 20 2020
Synopsis for hawaiian coastal waters.. High pressure north of the area will move east southeast over the next few days resulting in lighter trade winds. A front will approach the area from the northwest with winds becoming lighter and favoring a southerly direction.


7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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FXHW60 PHFO 201919 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 919 AM HST Mon Jan 20 2020

SYNOPSIS. Moderate to locally breezy trade winds will continue today, then diminish Tuesday through Friday as the low level winds shift around to the southeast. Typical trade wind showers will prevail today and tonight, with a mostly dry land and sea breeze pattern then expected through the remainder of the work week, with only a few clouds and showers developing over interior and mountain areas each afternoon. A front is expected to stall and weaken near Kauai Friday night, with trades then returning over the weekend.

DISCUSSION. Currently at the surface, a 1024 mb high centered around 450 miles northeast of Honolulu is driving moderate to locally breezy trade winds across the island chain this morning. Meanwhile, the first in a series of fronts is located around 1300 miles west-northwest of Kauai, or just to the west of Midway Atoll. Infrared satellite imagery shows partly to mostly cloudy skies, with cloud cover most prevalent in windward areas. Radar imagery shows scattered showers moving into windward areas, with a few of these showers making the trip over into leeward locales. Main short term concern revolves around the diminishing trade winds.

High pressure northeast of the state will shift eastward over the next couple of days as a front approaches from the northwest and passes by several hundred miles north of the island chain. Moderate to locally breezy trade winds will hold today, then begin to diminish tonight and early Tuesday, with land and sea breezes then expected to prevail Tuesday afternoon through Friday. A new front will be approaching the islands from the northwest late in the work week, and is expected to stall near Kauai Friday night. High pressure will build in behind the front to the north of the islands over the weekend, allowing the trade winds to return. The next front approaching the area from the northwest Sunday night into early next week, could disrupt the trade winds once again.

Typical trade wind showers, favoring windward and mauka areas along with the occasional leeward spillover, will continue through the morning hours. We should see shower coverage diminish considerably by late morning/early afternoon as a drier airmass builds in. Trade showers will continue tonight into Tuesday morning, but the shower coverage should be much less than what occurred earlier this morning. A land/sea breeze pattern is then expected to take hold Tuesday afternoon through Friday. This will bring a rather dry period of weather to the state, with a few showers popping up each afternoon over the interior and mountain areas, with mainly rain free weather at night. An increase in showers will be possible Friday night and Saturday as a front stalls out near Kauai and the trade winds begin to return. Shower coverage will likely be the highest across Kauai, particularly windward areas, although some increase in windward showers will be possible across windward sections of the other islands as well. Fairly typical trade wind showers should then continue through the remainder of the weekend, with a land/sea breeze pattern potentially setting up again early next week.

AVIATION. Showers continue to impact both windward and leeward areas of the island chain this morning. These showers will allow for some brief periods of MVFR conditions, but VFR will prevail overall. Expecting clouds and showers to become more scattered and confined to the windward slopes and coasts as the day goes on.

Trades will be on the decline later today as they shift around to a more east-southeasterly direction for Tuesday. This decrease will allow AIRMET Tango for tempo moderate low level turbulence below 7,000 feet to be cancelled by tonight.

MARINE. High pressure is currently centered several hundred miles north- northeast of the state resulting is breezy trade winds across the area. A Small Craft Advisory (SCA) is currently posted for all Hawaiian Coastal Waters due to a combination of strong trade winds and rough seas. The high will move off to a position far to the east-northeast of the area over the next couple of days with trade winds becoming lighter. By midweek, a front will be approaching the area from the northwest. Winds will become south to southeast and remain on the lighter side as the front stalls northwest of the area. However, large northwest swells will likely cause seas to reach SCA levels over exposed waters at times.

A High Surf Advisory is currently posted for waters exposed to a moderate size north-northwest swell. Data from the nearshore buoys indicate the swell has likely peaked and will lower gradually tonight through Tuesday night.

A rather active period for high surf is expected this week as strong low pressure systems pass across the North Pacific over the next several days. These low pressure systems will be rather robust swell producers. A large and very long period northwest swell is expected to begin arriving Tuesday night. This swell is expected to build on Wednesday, peak Wednesday night, then lower gradually Thursday through Friday. Latest guidance indicates that surf heights will likely reach High Surf Warning levels along most north and west facing shores during the peak of this swell. Another large northwest swell is expected to build late Friday and Friday night, peak on Saturday, then lower gradually Saturday night through Sunday. Warning level surf is once again expected during the peak of this swell.

Only small background south swells are expected through the week and on into the weekend. With the expected drop off in trade winds over the next few days, short period choppy surf will diminish along east facing shorelines. However some south and east facing shores may see some localized higher surf this week from the large northwest swells refracting around islands and reefs.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for Niihau-Kauai Windward-Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Olomana-Molokai-Maui Windward West-Maui Central Valley- Windward Haleakala.

Small Craft Advisory until 6 PM HST this evening for all Hawaiian waters-



DISCUSSION . Jelsema AVIATION . Dye MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi87 min E 8 G 15 73°F 74°F1021.1 hPa
51207 4 mi33 min 77°F9 ft
51210 4 mi33 min 76°F8 ft
51202 - Mokapu Point, HI (098) 7 mi33 min 77°F9 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi51 min E 4.1 G 12 77°F 77°F1020.3 hPa
51211 13 mi33 min 78°F3 ft
51212 20 mi33 min 78°F5 ft
51201 - Waimea Bay, HI (106) 23 mi27 min 73°F9 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi91 minE 7 G 176.00 miMostly Cloudy with Haze77°F68°F74%1020 hPa
Daniel K Inouye International Airport, HI9 mi70 minNE 1110.00 miPartly Cloudy79°F64°F62%1020.5 hPa
Wheeler Air Force Base / Oahu, HI12 mi2.1 hrsE 610.00 miMostly Cloudy71°F69°F95%1020.9 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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1 day agoNE14--NE14NE17NE16NE17NE18
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2 days agoNE20N16NE19NE17NE18NE15NE15NE12
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Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu 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 Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Mon -- 12:37 AM HST     2.08 feet High Tide
Mon -- 03:32 AM HST     Moonrise
Mon -- 07:10 AM HST     Sunrise
Mon -- 08:12 AM HST     0.45 feet Low Tide
Mon -- 11:47 AM HST     0.69 feet High Tide
Mon -- 02:51 PM HST     Moonset
Mon -- 05:50 PM HST     -0.10 feet Low Tide
Mon -- 06:13 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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22.11.91.71.310.70.50.50.50.60.70.70.60.50.30.1-0.1-0.100.30.71.21.7

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 (18,4,5,8)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.