Thursday, October22, 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 6:23AMSunset 5:57PM Thursday October 22, 2020 4:05 PM HST (02:05 UTC) Moonrise 12:38PMMoonset 11:45PM Illumination 37% Phase: Waxing Crescent; Moon at 6 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- 358 Pm Hst Thu Oct 22 2020
Tonight..East winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers after midnight.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Saturday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Sunday..Winds variable less than 10 knots becoming south 15 knots in the afternoon. Wind waves 2 feet or less. Isolated showers in the afternoon.
Sunday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Numerous showers.
PHZ100 358 Pm Hst Thu Oct 22 2020
Synopsis for hawaiian coastal waters.. A weakening surface front is approaching the northwest coastal waters and is expected to dissipate northwest of kauai by tomorrow. A ridge of high pressure will build back in over the island chain through the weekend and into early next week keeping light to moderate southerly flow over most of the coastal waters.


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 230136 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 336 PM HST Thu Oct 22 2020

SYNOPSIS. A trough to the northwest is bringing light winds and humid weather to the area. Through tomorrow, the trough will bring the chance of locally heavy showers for Kauai and Oahu, with drier and more stable weather over Maui County and the Big Island. Over the weekend, an area of moisture moving over the islands from east will bring wetter weather to the Big Island. A ridge building over the area early next week will bring temporarily drier weather Sunday. A new low deepening northwest of the islands next week may produce rainy weather through the rest of the week.

DISCUSSION. A front about 100 miles northwest of Kauai is moving southeast slowly. A surface ridge extends northeast from just northeast of the island to a high off the Oregon coast. A low aloft lingers about 350 miles north of Kauai. The moist southerly flow and instability from the low aloft will maintain a chance of locally heavy showers through tomorrow for Kauai County and Oahu. The atmosphere is drier and more stable over Maui County and the Big Island of Hawaii. Afternoon clouds over those islands will clear tonight, then afternoon clouds and showers will form again tomorrow.

On Saturday, Kauai and Oahu will dry out while a new area of moisture moves over the Big Island from the east. A ridge building over the area Sunday will temporarily bring drier weather. The models have come into better agreement for next week. The ECMWF and GFS both show a deep trough aloft digging west of the area starting Monday night. Deep, moist southerly flow over the area may keep the islands quite wet through much of next week.

AVIATION. A nearly stationary band of clouds and showers lies near Oahu. The airmass is rather unstable. This combined with daytime heating has allowed for clouds and showers to form over Kauai and Oahu. Showers will likely taper off during the overnight hours. Expect periods of MVFR conditions with local IFR conditions possible in heavy showers over Kauai and Oahu mainly through the evening hours. Maui county and the Big Island will see a few showers this evening with generally dry conditions overnight.

AIRMET Sierra is currently posted over Oahu for tempo mountain obscuration. Expect improving conditions overnight.

MARINE. A surface high far northeast of the area and an approaching weakening front just northwest of the coastal waters is producing light and variable winds in the vicinity of the smaller islands and moderate east to southeast winds over the waters near the Big Island. A vertically stacked low is providing scattered thunderstorm and locally heavy downpours in the offshore waters but thunderstorm activity in the coastal waters is now over. Another front will approach the islands from the northwest next week keeping light to moderate southerly winds over most of the state.

Surf produced by the current small, short period northeast swell will continue to gradually subside through Friday. A new long period northwest swell will arrive late Saturday and may produce High Surf Advisory level surf along north facing shores for some of the smaller islands Sunday. This swell will subside from Monday into the middle of next week.

A small, medium period south swell will maintain small background surf along south facing shores through this weekend. In addition, a small southeast swell will produce small background surf along exposed shorelines, such as the south Big Island, into Saturday. Otherwise, expect surf along the other shorelines to remain small.

HFO WATCHES/WARNINGS/ADVISORIES. None.

DISCUSSION . Donaldson AVIATION . Burke Marine . Foster/Almanza


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 22 mi47 min NNE 6 G 8.9 81°F 82°F1011.9 hPa
51213 24 mi39 min 82°F3 ft
51202 - Mokapu Point, HI (098) 80 mi39 min 82°F3 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI22 mi69 minS 810.00 miMostly Cloudy79°F72°F79%1012 hPa
Kahului, Kahului Airport, HI23 mi71 minN 710.00 miA Few Clouds88°F64°F46%1012.2 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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Last 24hrW5W4N3NE5E4SE3E4E6E5E5E6E4E7E6E7E10SE7SE8S10SE10
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1 day agoW6S3CalmSE3SE4SE4CalmNE4E4E6E4CalmE5E4NE4E6E4NW4S6W6W44W9W7
2 days agoW7NW3N5N3NE3NE4CalmE4E4E4E4E6NE4E4E6E6SE8S10S9S13
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Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Kuheia Bay
Click for Map
Thu -- 12:49 AM HST     0.40 feet Low Tide
Thu -- 06:24 AM HST     Sunrise
Thu -- 09:06 AM HST     2.33 feet High Tide
Thu -- 12:37 PM HST     Moonrise
Thu -- 05:23 PM HST     0.34 feet Low Tide
Thu -- 05:56 PM HST     Sunset
Thu -- 10:33 PM HST     0.89 feet High Tide
Thu -- 11:44 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.60.91.31.722.22.32.32.11.71.310.70.40.40.40.50.60.80.90.9

Tide / Current Tables for Smuggler Cove, Kahoolawe Island, Hawaii
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Smuggler Cove
Click for Map
Thu -- 01:02 AM HST     0.40 feet Low Tide
Thu -- 06:24 AM HST     Sunrise
Thu -- 09:00 AM HST     2.33 feet High Tide
Thu -- 12:37 PM HST     Moonrise
Thu -- 05:35 PM HST     0.34 feet Low Tide
Thu -- 05:57 PM HST     Sunset
Thu -- 10:27 PM HST     0.89 feet High Tide
Thu -- 11:45 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.40.60.91.31.722.22.32.321.71.410.70.50.40.40.50.60.80.90.9

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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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.