Tuesday, March31, 2020
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Marine Weather and Tides
Urban Honolulu, 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 6:23AMSunset 6:47PM Tuesday March 31, 2020 10:10 AM HST (20:10 UTC) Moonrise 11:37AMMoonset 12:29AM Illumination 53% Phase: First Quarter Moon; Moon at 8 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- 932 Am Hst Tue Mar 31 2020
Rest of today..Northeast winds 15 knots. Wind waves 3 feet. SWell east 4 feet. Isolated showers through the day.
Tonight..East winds 15 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of Thunderstorms and isolated showers.
Wednesday..East winds 15 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of Thunderstorms and isolated showers.
Wednesday night..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of Thunderstorms in the evening. Isolated showers through the night.
Thursday..East winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers.
Thursday night..Winds variable less than 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers.
Friday..Winds variable less than 10 knots becoming southwest 10 knots after midnight. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Scattered showers.
Saturday..Southwest winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Mixed swell northwest 4 to 6 feet and east 4 feet. Scattered showers.
PHZ100 932 Am Hst Tue Mar 31 2020
Synopsis for hawaiian coastal waters.. A broad surface trough will shift westward over the islands through midweek, then lift northward and weaken ahead of an approaching front Thursday through Friday. The front will stall west of the area this weekend.


7 Day Forecast for Marine Location Near Urban Honolulu, HI
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location: 21.29, -157.88     debug


Area Discussion for -
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FXHW60 PHFO 311332 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 332 AM HST Tue Mar 31 2020

SYNOPSIS. Moderate trade winds will decrease by Wednesday. Showers will increase today and Wednesday, mainly over windward areas, switching focus to interior and upslope areas in the afternoons by the end of the week.

DISCUSSION. Moderate trades due to a high northeast of the main Hawaiian Islands will give way to lighter winds through the week. A front to the northwest of the islands will move to the east, disrupting trade wind flow by Wednesday. The surface ridge ahead of this front will likely be pushed across the islands by the end of the week.

Through Wednesday, winds will be mostly out of the east, keeping showers focused over windward areas. An increase in low level moisture at this time will fuel additional shower activity. A weak upper trough approaching from the northwest will increase instability across the region, and a slight chance of thunderstorms exists tonight through Wednesday. Kauai received a lot of rain recently, and additional rain there could lead to minor flooding. A Flash Flood Watch may be needed for that island and this could be issued later today if conditions warrant.

Winds will decrease for the second half of the week, which will allow development of land and sea breezes. Clouds and showers would then focus over interior and upslope areas during the afternoon hours. Another low and associated upper trough approaching from the northwest this weekend could bring another round of moisture to the islands, but it is too early to determine details.

AVIATION. An upper low drifting in from the west will keep unsettled weather in the forecast for the next 24 hours with periods of showers and brief MVFR conditions. Lighter winds over the next few days will result in land and sea breezes developing along more sheltered west slopes of each island. An upper level jet stream will keep cirrus clouds over the state along with tempo moderate turbulence aloft.

AIRMET SIERRA in effect for tempo mountain obscuration over north through east sections of Kauai and Oahu this morning. This AIRMET will decrease in coverage later this morning.

AIRMET TANGO remains in effect for moderate turbulence aloft between FL250 and FL350 due to an upper level jet over the islands. This AIRMET will continue through the morning hours.

MARINE. Moderate to fresh easterly trades associated with high pressure northeast of the state will trend down today through midweek. Light and variable winds will result Wednesday through the second half of the week as a broad trough and an upper disturbance move over the islands. This pattern will bring another round of heavy showers and a few thunderstorms over portions of the area by Wednesday. The trough will lift northward and away from the area as a cold front approaches and stalls to the west over the upcoming weekend. Prevailing background winds will become southeasterly by Thursday, then continue into the weekend.

Surf along north and west facing shores will trend up today through Wednesday as a small, medium-period northwest swell builds down the island chain. Guidance shows low pressure forming south of the Aleutians, near the Date Line, tonight, then dropping southward Wednesday through Thursday to an area around 1000 nautical miles northwest of the state. North-northwest winds focused at the islands within the 320-340 directional bands will near, if not reach gale-force levels. Seas are forecast to climb into the 20-25 ft range within this area. Although most of this energy may end up missing the islands to the west, a moderate, medium-period north-northwest swell will remain a possibility Friday night through Saturday. A gradual downward trend is expected Sunday through Monday.

Surf along south facing shores may trend up by Wednesday as a small, long-period south-southeast swell builds. Otherwise, background southerly swells should be enough to keep the surf from going flat later in the week through the upcoming weekend.

Surf along east facing shores will remain up through midweek, despite the trades relaxing locally. Heights should trend down by the end of the week and upcoming weekend as the upstream fetch relaxes.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Powell AVIATION . Bohlin MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi70 min E 2.9 G 6 75°F 76°F1017.3 hPa (+1.3)
51211 4 mi70 min 76°F3 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi94 min ENE 4.1 G 8.9 75°F 75°F1017.4 hPa
51210 14 mi40 min 75°F6 ft
51212 14 mi40 min 76°F3 ft
51207 15 mi40 min 75°F5 ft
51201 - Waimea Bay, HI (106) 29 mi40 min 75°F4 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi17 minENE 710.00 miOvercast75°F64°F69%1016.9 hPa
Oahu, Kalaeloa Airport, HI10 mi77 minVar 310.00 miFair76°F64°F69%1018.3 hPa
Kaneohe, Marine Corps Air Station, HI12 mi73 minE 710.00 miMostly Cloudy79°F64°F62%1016.4 hPa
Wheeler Air Force Base / Oahu, HI15 mi74 minN 010.00 miA Few Clouds71°F65°F82%1016.4 hPa

Link to 5 minute data for PHNL

Wind History from HNL (wind in knots)
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Last 24hrNE12E13E13NE13E15NE11NE13E13E10E12E8NE9E9NE7NE7E11E8N4E13E9CalmE9E4E7
1 day agoNE14
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E13E15E11E12E9NE9E10NE12NE9E7E10E8E9E9E10NE9E12E13
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2 days agoE7E16NE13
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NE15E11E13E13E10E8E6E8E7E9NE4E5E8N4NE54E9NE9

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
Tue -- 12:28 AM HST     Moonset
Tue -- 05:04 AM HST     0.35 feet Low Tide
Tue -- 06:24 AM HST     Sunrise
Tue -- 08:07 AM HST     0.43 feet High Tide
Tue -- 11:36 AM HST     Moonrise
Tue -- 01:26 PM HST     0.19 feet Low Tide
Tue -- 06:45 PM HST     Sunset
Tue -- 09:37 PM HST     1.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.60.50.40.40.40.40.40.40.40.30.20.20.20.30.50.711.31.51.61.61.5

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 (16,3,4,5)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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 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.