Friday, February28, 2020
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Marine Weather and Tides
Haleiwa, 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 6:52AMSunset 6:37PM Friday February 28, 2020 10:13 AM HST (20:13 UTC) Moonrise 10:07AMMoonset 11:02PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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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PHZ114 Oahu Windward Waters- 934 Am Hst Fri Feb 28 2020
.small craft advisory in effect through Sunday afternoon...
Rest of today..East winds to 25 knots. Wind waves 9 feet. Northwest swell 8 feet. Scattered showers.
Tonight..East winds to 25 knots. Wind waves 10 feet. Northwest swell 8 feet. Scattered showers through the night. Slight chance of Thunderstorms after midnight.
Saturday..East winds to 25 knots. Wind waves 10 feet. Northwest swell 7 feet. Scattered showers and slight chance of Thunderstorms.
Saturday night..East winds to 25 knots. Wind waves 10 feet. Northwest swell 6 feet. Showers likely and slight chance of Thunderstorms.
Sunday..East winds to 25 knots. Wind waves 11 feet. Northwest swell 5 feet decreasing to 3 feet in the afternoon. Showers likely in the morning. Slight chance of Thunderstorms through the day. Scattered showers in the afternoon.
Sunday night..East winds to 25 knots. Wind waves 12 feet. Northwest swell 3 feet. Slight chance of Thunderstorms in the evening. Scattered showers through the night.
Monday..East winds 20 knots. Wind waves 11 to 12 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 8 to 10 feet. Scattered showers.
PHZ100 934 Am Hst Fri Feb 28 2020
Synopsis for hawaiian coastal waters.. High pressure northeast of the area will result in strong to near gale force winds through this weekend. An upper level low could bring period of locally heavy showers and a slight chance of Thunderstorms through the weekend.


7 Day Forecast for Marine Location Near Haleiwa, HI
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location: 21.6, -158.12     debug


Area Discussion for -
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FXHW60 PHFO 281949 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 949 AM HST Fri Feb 28 2020

SYNOPSIS. Strong trade winds will focus showers along windward slopes today with some brief heavy downpours. High pressure will strengthen north of the state, boosting trades further through the weekend. An upper low will bring an increase in showers through the weekend with a slight chance of thunderstorms. Wet and unsettled conditions may persist into early next week.

DISCUSSION. A strong high pressure located far northeast of the state is expected to strengthen further over the next few days, boosting our already strong trade winds to near advisory levels. However, an upper level low now east of Hawaii will edge over the eastern portion of the state today and drift overhead this weekend, bringing increasing instability. This feature will likely weaken the local surface pressure gradient and keep the strongest trade winds to the northeast of the islands. Nonetheless, island winds are expected to be near advisory levels through the weekend before abating early next week as the high weakens.

The aforementioned upper low will cool temperatures aloft and remove our normal stabilizing temperature inversion. Models have been consistently forecasting 500 mb temperatures near -16 C which is about as cold as it gets over Hawaii. These cold temperatures and associated instability will bring the chance for thunderstorms and locally heavy downpours. The strong winds near the surface will keep most of the heavy rain moving along at a fast pace, but windward areas will have a steady diet of moderate to heavy showers and isolated thunderstorms. The chances of flood advisories are likely, and a flash flood warning is not out of the question for windward areas, even with the strong trades. Highest rainfall totals are expected over the eastern half of the state as the coldest temperatures aloft remain to the east. For leeward areas of the smaller islands, expect strong, gusty trade winds with quick hitting heavy showers.

Winter weather at the higher elevations of the Big Island and Haleakala are a possibility as well. The upper low will drop freezing levels to 9000 feet or lower, so any moisture falling at the summits will be in the form of snow or freezing rain. The highest probability for winter weather on the summits appears to be on Saturday night into Sunday but may occur as early as tonight with upper level temperatures dropping rapidly.

AVIATION. A strong surface high located far northeast of the main Hawaiian Islands will maintain gusty northeast to east trade winds through Saturday. As a result, AIRMET TANGO remains in effect for moderate low-level turbulence below 090 immediately south through west of the mountains on all islands.

The strong trades will also continue to transport low clouds with embedded showers into northeast facing sections of the islands today, producing brief periods of MVFR conditions due to lower ceilings and reduced visibilities. Otherwise, expect VFR conditions to prevail across most of the state. Low cloud and shower coverage may increase later tonight through early Saturday morning due to the proximity of an upper level low. This could result in more widespread MVFR conditions over the higher terrain and northeast facing slopes and the need for AIRMET SIERRA for mountain obscuration over some islands.

Strong winds on the west side of the aforementioned low could also result in an area of moderate upper-level turbulence tonight through Saturday. Will monitor the situation for possible issuance of AIRMET TANGO later tonight.

MARINE. Strong high pressure northeast of the area is resulting in strong to near gale force winds across the coastal waters. A Small Craft Advisory (SCA) is in effect for all coastal waters through the weekend. At this time, it does not look like winds will reach gale force. An upper level low is expected to move over the state from the northeast tonight, introducing periods of locally heavy showers and a slight chance or thunderstorms through the weekend.

The current northwest swell, although slow to start, should peak near the islands in the next few hours with surf building to advisory levels. Current observations from the PacIOOS Hanalei Bay and Waimea Bay buoys are 6 ft/14-15 sec and 4-5 ft/15 sec, respectively. A High Surf Advisory is posted for the exposed north and west facing shores of the smaller islands through this afternoon. This may need to be extended through tonight, based on the late arrival of the swell. This swell will then subside into the weekend, with no significant northwest swells expected into next week.

Surf will also slowly build along east facing shores as the trade winds strengthen. A High Surf Advisory for east facing shores will likely be needed this weekend, and it is possible the surf could reach warning levels Sunday into the beginning of next week.

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 Sunday for all Hawaiian waters-



DISCUSSION . Morrison AVIATION . TS MARINE . EATON


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51201 - Waimea Bay, HI (106) 5 mi43 min 75°F8 ft
51212 19 mi43 min 76°F4 ft
51207 21 mi43 min 75°F8 ft
51210 21 mi43 min 75°F8 ft
MOKH1 - 1612480 - Mokuoloe, HI 21 mi97 min ENE 18 G 21 73°F 74°F1020.7 hPa
51211 23 mi73 min 76°F2 ft
OOUH1 - 1612340 - Honolulu, HI 25 mi61 min NNE 6 G 11 1020.9 hPa
51202 - Mokapu Point, HI (098) 27 mi43 min 75°F9 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for PHHI

Wind History from HHI (wind in knots)
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Last 24hrN5NE6CalmSW3E4E7E5NE9E14
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NE6NE10NE8NE8NE8NE6NE8NE6NE7NE11
1 day agoNE7NE3NE8E7--E7E11E10E7NE10E8E8
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2 days ago------CalmE6E10E16
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Tide / Current Tables for Haleiwa, Waialua Bay, Oahu Island, Hawaii
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Haleiwa
Click for Map
Fri -- 05:32 AM HST     0.95 feet High Tide
Fri -- 06:54 AM HST     Sunrise
Fri -- 10:06 AM HST     Moonrise
Fri -- 10:59 AM HST     0.13 feet Low Tide
Fri -- 06:36 PM HST     Sunset
Fri -- 06:53 PM HST     1.05 feet High Tide
Fri -- 11:02 PM HST     Moonset
Fri -- 11:56 PM HST     0.48 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.60.80.90.90.90.80.60.40.20.10.20.30.40.60.80.91110.80.70.5

Tide / Current Tables for Laie Bay, Oahu Island, Hawaii
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Laie Bay
Click for Map
Fri -- 04:49 AM HST     1.29 feet High Tide
Fri -- 06:53 AM HST     Sunrise
Fri -- 10:05 AM HST     Moonrise
Fri -- 11:18 AM HST     0.26 feet Low Tide
Fri -- 06:10 PM HST     1.41 feet High Tide
Fri -- 06:35 PM HST     Sunset
Fri -- 11:01 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.80.91.11.31.31.210.80.60.40.30.30.40.70.91.21.31.41.41.21.10.90.8

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 (15,3,4,5)
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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.