Thursday, February20, 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 6:57AMSunset 6:32PM Thursday February 20, 2020 8:35 AM HST (18:35 UTC) Moonrise 5:09AMMoonset 4:18PM Illumination 9% Phase: Waning Crescent; Moon at 27 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- 315 Am Hst Thu Feb 20 2020
.small craft advisory in effect through early Friday morning...
Today..East winds to 25 knots. Wind waves 13 feet. North swell 5 feet. Isolated showers.
Tonight..East winds to 25 knots. Wind waves 11 feet. North swell 5 feet. Isolated showers through the night.
Friday..East winds to 25 knots. Wind waves 9 feet. North swell 4 feet. Isolated showers.
Friday night..East winds 20 knots. Wind waves 8 feet. North swell 4 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..Southeast winds 15 knots. Wind waves 6 feet. Northwest swell 6 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..South winds 10 knots backing north. Wind waves 5 feet. Northwest swell 4 to 5 feet. Isolated showers.
Monday..Northeast winds 15 knots rising to to 25 knots after midnight. Wind waves 5 feet. North swell 5 to 7 feet. Isolated showers.
PHZ100 315 Am Hst Thu Feb 20 2020
Synopsis for hawaiian coastal waters.. A strong surface high far north of the islands will move slowly east over the next few days. The high will produce strong easterly trade winds, with gales in areas where the wind accelerates around the islands. By this weekend, the winds will gradually weaken, and shift out of the southeast as a front approaches from the northwest.


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 201303 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 303 AM HST Thu Feb 20 2020

SYNOPSIS. Gusty trade winds will continue today, then gradually decrease tonight through Saturday as a front approaches from the northwest. Although rainfall will focus over windward and mauka locations, strong winds will push showers into leeward areas at times as well. Winds will become light and variable by Sunday as the front nears the islands, with sea and land breezes expected statewide. Showers will favor interior and mountain areas during the day and locations near the coast at night. Trade winds are expected to return early next week, with rather wet conditions possible over the western islands as the front stalls out in this vicinity.

DISCUSSION. Currently at the surface, a 1033 mb high centered around 900 miles north-northeast of Honolulu is driving strong and gusty trade winds across the island chain early this morning. Infrared satellite imagery shows the back edge of a swath of low clouds approaching the islands from the east, with mostly cloudy skies present across much of the state at the moment. Radar imagery shows numerous showers pushing into windward areas from Maui to Kauai, with coverage beginning to diminish over windward Big Island. Considerable leeward spillover continues into leeward sections of the smaller islands, while leeward Big Island is mainly dry. Main short term concerns revolve around trade wind trends and rain chances through the remainder of the work week and into the weekend.

Strong high pressure will slide eastward and weaken slightly over the next few days as a cold front approaches from the northwest. Strong and gusty trades will continue across the island chain today, and as a result, the Wind Advisory is now in effect for most areas of the state through 6 PM this evening. The trades are expected to trend lower tonight and Friday, then shift around to the east-southeast on Saturday as the front moves closer. Light and variable winds will likely develop by late Saturday across the western islands while moderate trades hold on across the eastern end of the state. The gradient will slacken further Saturday night, allowing a land breeze pattern to develop statewide, with this sea/land breeze pattern holding in place through at least Sunday night. Model solutions are in fairly good agreement showing the front or its remnant band of moisture pushing into the western islands Monday, then stalling out in this area through the first half of next week before dissipating. As the front stalls, a new high will slide by well to the north of the island chain. Trade winds look to return Monday, with moderate to breezy trades taking hold Monday night and continuing through the middle of next week.

As for weather details, the back edge of the showery low clouds is expected to push westward through the islands over the next few hours, with a much drier airmass overspreading the island chain around or shortly after daybreak. This should bring a more typical trade wind shower pattern to the local area through Friday night, with showers favoring windward and mauka areas. A few showers will continue to spread leeward, although there will likely be a reduction in leeward shower coverage given precipitable water values dropping to around 0.75 inches.

Over the weekend, a transition over to a sea breeze/land breeze pattern will keep showers favoring areas near the coast in an east-southeast to southeast boundary layer flow at night, and interior and mauka areas during the afternoon/early evening. A transition over to a trade wind pattern will bring a return of more windward/mauka showers and the occasional leeward spillover early next week. Rather wet conditions could develop over the western islands during the first half of next week however, as the front or its remnants stall out in this vicinity.

AVIATION. Gusty easterly trades and showery conditions due to a band of moisture/clouds moving through will continue through the early morning hours today. Although most of the shower coverage has been focusing over windward sections of the islands, the strong winds are managing to carry some showers over into leeward areas as well. Satellite imagery did show much drier air trailing this band of moisture, which has already begun to push into windward areas of the Big Island. This should result in a gradual drying trend through the morning hours from east to west. Until then, MVFR ceiling and visibilities will continue for windward areas, especially in and around passing showers. The strong trades should begin to trend down later this evening and into the overnight hours tonight.

AIRMET Sierra for tempo mountain obscuration is in effect for windward sides of Kauai, Oahu, Molokai, Maui and the Big Island. This may be cancelled by mid morning as conditions gradually improve and the aforementioned drier air fills in.

AIRMET Tango remains in effect for tempo moderate low level turbulence over and downwind of the terrain.

MARINE. A strong surface high pressure system is moving steadily east far north of the state. The very tight pressure gradient south of this feature is producing strong to near-gale force easterly trade winds over Hawaiian waters, with winds reaching gale force in areas where the wind accelerates around the islands. A Gale Warning remains in effect through this afternoon for the typically windier waters adjacent to the islands of Maui County and the Big Island. A Small Craft Advisory (SCA) also remains in effect through early Friday morning for all other Hawaiian Waters. The SCA will likely be scaled back to include fewer areas as winds and seas slowly diminish from Friday through Friday night.

By this weekend, the surface high will move farther away to the east, as a front approaches the state from the northwest. This will allow the trade winds to weaken, and start to shift out of the east-southeast over most areas by Saturday. The front is expected to move into the far northwest Hawaiian offshore waters Sunday, with increasing northeasterly trade winds returning behind the front.

The strong trade winds will maintain rough, elevated surf along east facing shores through Friday. As a result, a High Surf Advisory remains in effect through Friday afternoon for east facing shores of the islands. This surf will subside over the weekend as the trade winds weaken.

The current small northwest swell will continue through this evening, then gradually lower from later tonight through Friday. A slightly larger, long-period northwest swell arriving late Friday will likely peak on Saturday, then gradually lower from Sunday through Monday. A new large northwest swell is possible early next week. Elsewhere, a series of small south and south- southwest swells will maintain small background surf along south facing shores through this weekend.

HFO WATCHES/WARNINGS/ADVISORIES. Wind Advisory until 6 PM HST this evening for Kauai-Oahu-Molokai- Lanai-Kahoolawe-Maui Windward West-Maui Leeward West-Maui Central Valley-Windward Haleakala-Leeward Haleakala-South Big Island-Big Island North and East-Kohala.

High Surf Advisory until 6 PM HST Friday for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West-Windward Haleakala-South Big Island-Big Island North and East.

Gale Warning until 6 PM HST this evening for Maalaea Bay-Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

Small Craft Advisory until 6 AM HST Friday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel- Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maui County Leeward Waters-Big Island Windward Waters.



DISCUSSION . Jelsema AVIATION . Gibbs MARINE . Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi54 min E 6 G 17 74°F 76°F1022.9 hPa
51211 4 mi66 min 76°F4 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi60 min E 16 G 21 74°F 73°F1023.5 hPa
51202 - Mokapu Point, HI (098) 14 mi36 min 75°F10 ft
51210 14 mi36 min 75°F10 ft
51212 14 mi36 min 77°F4 ft
51207 15 mi36 min 75°F10 ft
51201 - Waimea Bay, HI (106) 29 mi36 min 75°F7 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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NE6
G15
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G8

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi43 minENE 17 G 2110.00 miA Few Clouds74°F55°F54%1022.9 hPa
Oahu, Kalaeloa Airport, HI10 mi43 minE 710.00 miFair74°F57°F57%1023.8 hPa
Wheeler Air Force Base / Oahu, HI15 mi1.7 hrsENE 1410.00 miA Few Clouds67°F58°F73%1022.1 hPa

Link to 5 minute data for PHNL

Wind History from HNL (wind in knots)
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1 day agoNE12NE13
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2 days agoE13
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NE11NE10NE11
G15
NE8NE14--NE11E15
G19
E16

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
Thu -- 01:41 AM HST     2.11 feet High Tide
Thu -- 05:08 AM HST     Moonrise
Thu -- 06:58 AM HST     Sunrise
Thu -- 09:09 AM HST     0.16 feet Low Tide
Thu -- 01:44 PM HST     0.72 feet High Tide
Thu -- 04:18 PM HST     Moonset
Thu -- 06:31 PM HST     Sunset
Thu -- 07:12 PM HST     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.12.121.61.30.80.50.30.20.20.40.50.70.70.60.50.30.1-000.30.71.1

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 (13,3,4,5)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.