Friday, February21, 2020
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Marine Weather and Tides
Haena, 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 6:33PM Friday February 21, 2020 2:42 PM HST (00:42 UTC) Moonrise 6:05AMMoonset 5:18PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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PHZ110 Kauai Northwest Waters- 908 Am Hst Fri Feb 21 2020
Rest of today..East winds to 25 knots. Wind waves 8 feet. Northwest swell 4 feet. Isolated showers through the day.
Tonight..East winds 20 knots. Wind waves 8 feet. Northwest swell 5 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 7 feet. Northwest swell 6 feet. Isolated showers.
Saturday night..Southeast winds 10 knots. Wind waves 6 feet. Northwest swell 5 feet. Isolated showers through the night.
Sunday..Southwest winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Isolated showers in the morning.
Sunday night..Winds variable less than 10 knots becoming northeast 10 knots after midnight. Wind waves 5 feet. Northwest swell 4 feet. Scattered showers after midnight.
Monday..Northeast winds 10 knots becoming east 20 knots. Wind waves 6 to 7 feet. Northwest swell 7 to 9 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 7 feet. Northwest swell 11 to 13 feet. Scattered showers.
PHZ100 908 Am Hst Fri Feb 21 2020
Synopsis for hawaiian coastal waters.. A strong high northeast of the area will move southeast at 10 knots. A trough will form over the area ahead of a front approaching from the northwest. The front will dissipate north of the area on Monday. A new high moving east behind the front will be north of the area Tuesday.


7 Day Forecast for Marine Location Near Haena, HI
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location: 22.2, -159.68     debug


Area Discussion for -
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FXHW60 PHFO 212011 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1011 AM HST Fri Feb 21 2020

SYNOPSIS. High pressure far northeast of the state will track further away from the islands, resulting in weakening trade winds and less passing showers this weekend. A front will approach from the northwest and stall before reaching Kauai on Monday. Trades will gradually strengthen during the first half of next week.

DISCUSSION. A 1030 mb surface high is centered about 1200 miles northeast of Hawaii slowly tracking eastward. This high brought strong winds over the past few days, and winds are expected to weaken through Saturday as the high drifts further away from the islands. Visible satellite and radar show scattered clouds and a few showers moving in with the trade wind flow anchoring more of the cloud cover and showers across windward slopes. Downstream wave clouds are observed on satellite across leeward Oahu and Kauai due to the breezy trade winds. The subtropical jet setting up southeast of the area is producing some cirrus clouds over the Big Island this morning. 12Z soundings shows below average precipitable water (PW) values around 1 inch with strong inversions in place.

For the rest of today and tonight, expect mostly dry weather with breezy trade winds trending weaker. A few passing light showers may impact windward areas at times. Winds will be noticeably weaker by Saturday and veering out of the east southeast as a cold front approaches from the northwest. Winds will become light and variable by Saturday night continuing into Sunday, allowing sea breezes and interior clouds to set up Sunday afternoon.

The front will weaken and stall just northwest of Kauai on Monday with little direct impact to the state. High pressure behind the front will usher in trades that will overrun the front and will reach the islands Monday into Monday night. Trades will strengthen during the first half of next week and will bring additional clouds and showers to windward locations, with a few passing showers reaching leeward sides of the smaller islands.

AVIATION. AIRMET Tango remains in effect for tempo moderate low-level turbulence over and downwind of the terrain due to breezy trades. The surface high northeast of the state causing these winds will continue to move east over the next day or so, as a front approaches the islands from the northwest. As this happens, winds will switch to a more southeasterly direction and weaken beginning Saturday evening. In the mean time, stratocumulus with scattered showers will push into windward areas bringing occasional MVFR ceilings, while leeward areas see partly cloudy skies and only isolated showers.

MARINE. The 8 AM surface analysis shows a 1032 surface high about 920 nm northeast of the Hawaii Coastal Waters near 35N 148W. A ridge trails southwest from the high to 550 nm north of the area. The pressure gradient south of the ridge is producing fresh to near gale force easterly trade winds over the coastal waters. A Small Craft Advisory (SCA) remains in effect through today for the coastal waters except for the Kauai waters.

The high will move southeast at 10 knots over the next couple of days. Winds over Hawaiian waters will subside as the high moves farther away. Meanwhile a front will approach from the northwest with a trough forming ahead of the front over the northeast coastal waters. The front will enter the northwest offshore waters Sunday night, then dissipated. A new high moving east behind the front will bring a return of trade winds across Hawaiian waters by Monday night.

A High Surf Advisory remains in effect through this afternoon for east facing shores of the islands due to strong trade winds maintaining elevated surf. This surf will subside over the weekend as the trades weaken.

The current small northwest swell will gradually lower through today. A slightly larger, northwest swell arriving late today will likely peak on Saturday, then gradually lower Sunday through Monday. Surf from these swells will remain well below the advisory threshold. A large northwest swell is expected to arrive Monday night. Surf from this swell will peak well above the advisory level on Tuesday and the surf could reach warning levels.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for east facing shores of Kauai, Oahu, Molokai, Maui and Big Island.

Small Craft Advisory until 6 AM HST Saturday for Maui County Windward Waters- Maui County Leeward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel-Big Island Windward Waters-Big Island Leeward Waters-Big Island Southeast Waters.

Small Craft Advisory until 6 PM HST this evening for Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel.



DISCUSSION . Foster AVIATION . TS MARINE . Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 8 mi42 min 76°F8 ft
NWWH1 - 1611400 - Nawiliwili, HI 24 mi60 min ENE 12 G 16 79°F1020.9 hPa
51201 - Waimea Bay, HI (106) 91 mi42 min 75°F5 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kekaha, Pacific Missile Test Facility Barking Sands, HI10 mi46 minWNW 910.00 miMostly Cloudy0°F0°F%1020 hPa
Lihue, Lihue Airport, HI23 mi49 minENE 1210.00 miA Few Clouds79°F66°F65%1020.6 hPa

Link to 5 minute data for PHBK

Wind History from HBK (wind in knots)
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Last 24hrNW9NW7NW8CalmCalmCalmNE3NE4NE4NE4E5E4E4E3E4NE4NE4E4CalmW4W6NW5NW9W9
1 day agoW7NW7NW4NE3E6NE83NE4CalmNE3NE3SE3CalmN5E4SE3CalmCalmE4W8W7W9W8W11
2 days agoN18
G22
3W94S7W8W8W5CalmCalmE3N4E5NE3E5E6CalmE4N5W8N106NW12NW6

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Fri -- 01:46 AM HST     2.11 feet High Tide
Fri -- 06:03 AM HST     Moonrise
Fri -- 07:05 AM HST     Sunrise
Fri -- 08:32 AM HST     0.13 feet Low Tide
Fri -- 01:50 PM HST     0.81 feet High Tide
Fri -- 05:17 PM HST     Moonset
Fri -- 06:38 PM HST     Sunset
Fri -- 06:52 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.12.11.91.61.10.70.30.20.10.30.40.60.80.80.70.50.20-00.10.30.71.2

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Fri -- 02:57 AM HST     2.01 feet High Tide
Fri -- 06:02 AM HST     Moonrise
Fri -- 07:04 AM HST     Sunrise
Fri -- 09:58 AM HST     0.13 feet Low Tide
Fri -- 03:01 PM HST     0.71 feet High Tide
Fri -- 05:17 PM HST     Moonset
Fri -- 06:37 PM HST     Sunset
Fri -- 08:18 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.71.921.91.61.20.80.40.20.10.20.30.50.70.70.70.50.30.1-000.20.6

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 (19,4,5,8)
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Ground Weather Radar Station Kauai, 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.