Tuesday, September22, 2020
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Marine Weather and Tides
Makena, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:13AMSunset 6:23PM Monday September 21, 2020 6:15 PM HST (04:15 UTC) Moonrise 10:47AMMoonset 10:11PM Illumination 24% 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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PHZ119 Maalaea Bay- 325 Pm Hst Mon Sep 21 2020
Tonight..North winds 20 knots. Wind waves 2 feet or less.
Tuesday..North winds 20 knots. Wind waves 2 feet or less.
Tuesday night..North winds 20 knots. Wind waves 2 feet or less.
Wednesday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Wednesday night..North winds to 25 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Thursday..North winds to 25 knots. Wind waves 2 feet or less.
Thursday night..North winds to 25 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less.
Saturday..North winds 20 knots. Wind waves 3 to 5 feet.
PHZ100 325 Pm Hst Mon Sep 21 2020
Synopsis for hawaiian coastal waters.. A surface ridge north of the islands will support moderate trade winds through Tuesday night. The high will build Wednesday strengthening trade wind speeds before sliding east and weakening the winds this weekend. A moderate north swell will fill in on Wednesday and hold through the second half of the week.


7 Day Forecast for Marine Location Near Makena, HI
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location: 20.6, -156.6     debug


Area Discussion for -
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FXHW60 PHFO 220141 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 340 PM HST Mon Sep 21 2020

SYNOPSIS. Moderate trade winds will continue this week, becoming locally breezy at times. The trade winds will deliver just a few brief showers to mainly windward areas for most of the week, but an area of increased moisture may bring a few more showers Wednesday and Thursday. Winds are expected to diminish over the weekend.

DISCUSSION. A typical trade wind cloud and shower pattern is generally expected into the weekend, with an exception, as moderate (at times breezy) trade winds are supported by a surface ridge along 30N. While this means continued mostly dry, a few brief showers will favor windward areas during nights and mornings, and a stray shower may spread leeward on the smaller islands. The noted exception is an area of showery low clouds seen on satellite from 19N to 23N between 140W and 146W (about 550-1000 miles E of the Big Island), marking the remains of former eastern Pacific Tropical Storm Karina. Forecast models indicate this moisture will move over the islands Wednesday and Thursday, holding the promise of increased trade showers, especially for the Big Island. A mid-level ridge will keep the moisture capped, keeping shower intensity moderated.

A trend toward lighter winds is expected late in the weekend into next week as a front presses toward the islands from the N, weakening the ridge and shunting it southward. This overall pattern is not conducive for producing much in the way of rainfall, especially with the front expected to stall N of the islands.

Keen observers of island skies are noting periods of high-level clouds moving N and NE, associated with a low aloft located several hundred miles W of Kauai. While these ice particles aloft will have no impact other than to add color to the sunrise and sunset, guidance suggests this low will shift NW over the next couple of days, with the high clouds generally diminishing.

Autumn will arrive at 3:31 am HST Tuesday morning.

AVIATION. VFR conditions prevail at all TAF sites and these conditions are expected to continue through the evening and on through the overnight hours. Brief MVFR conditions can be expected over windward slopes and summits as moisture embedded in the trades interacts with island terrain.

No AIRMET's are in effect and none are expected to be issued through the overnight hours.

MARINE. Moderate to fresh trade winds will remain across the coastal waters through Tuesday night, with exposed areas near Small Craft Advisory (SCA) winds. High pressure will build north of the state and strengthen the trades Wednesday through Friday before weakening again this weekend as the high tracks away to the east. The SCA will likely be posted for the typical windy areas around Maui County and the Big Island during the Wednesday to Friday period. Surf along east facing shores will peak below advisory levels during this time.

A long period north northwest swell will build late Tuesday night, peak Wednesday night/Thursday at around 6 feet and 15 seconds, followed by gradual lowering through Friday. This will translate to surf just below advisory levels for the north shores.

A small south southwest swell is due in tonight, leading to near summer time average of 3 to 5 feet through midweek. Another small south southwest swell is possible Friday into Saturday.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Birchard AVIATION . Burke MARINE . Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 22 mi57 min NE 18 G 23 79°F 81°F1014.8 hPa
51213 24 mi49 min 82°F3 ft
51205 30 mi49 min 80°F5 ft
51202 - Mokapu Point, HI (098) 80 mi49 min 81°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI22 mi19 minNE 1210.00 miA Few Clouds74°F72°F94%1015.2 hPa
Kahului, Kahului Airport, HI23 mi21 minNE 19 G 2310.00 miPartly Cloudy and Breezy82°F68°F63%1015.4 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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Last 24hrNE10NE8NE10NE12NE11NE5N6E4E3NE5NE8NE6NE8NE14NE54S8CalmCalmNE16
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1 day agoNE12NE10NE9NE11NE9NE5NE9NE6NE14NE9NE11NE7E8CalmNE10W7W5NE6
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2 days ago--------E8N5NW5E5NE6N4E3NE8NE64W6W7W4N10NE8NE15NE15NE16
G22
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Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
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Kuheia Bay
Click for Map
Tue -- 12:50 AM HST     0.23 feet Low Tide
Tue -- 06:15 AM HST     Sunrise
Tue -- 08:30 AM HST     2.28 feet High Tide
Tue -- 11:50 AM HST     Moonrise
Tue -- 04:08 PM HST     0.64 feet Low Tide
Tue -- 06:21 PM HST     Sunset
Tue -- 08:05 PM HST     1.03 feet High Tide
Tue -- 11:03 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.611.41.82.12.32.32.11.81.51.10.90.70.60.70.81110.90.7

Tide / Current Tables for Smuggler Cove, Kahoolawe Island, Hawaii
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Smuggler Cove
Click for Map
Tue -- 01:02 AM HST     0.23 feet Low Tide
Tue -- 06:15 AM HST     Sunrise
Tue -- 08:24 AM HST     2.28 feet High Tide
Tue -- 11:50 AM HST     Moonrise
Tue -- 04:20 PM HST     0.64 feet Low Tide
Tue -- 06:22 PM HST     Sunset
Tue -- 07:59 PM HST     1.03 feet High Tide
Tue -- 11:03 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.50.91.41.82.12.32.32.11.81.51.20.90.70.60.70.81110.90.7

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
Ground Weather Radar Station Kohala, 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.