Friday, April10, 2020
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Marine Weather and Tides
Makena, 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 6:09AMSunset 6:44PM Friday April 10, 2020 8:29 AM HST (18:29 UTC) Moonrise 9:59PMMoonset 8:29AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 328 Am Hst Fri Apr 10 2020
Today..Winds variable less than 10 knots. Wind waves 2 feet or less. Chance of showers in the afternoon.
Tonight..Winds variable less than 10 knots. Wind waves 2 feet or less. Chance of showers.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Chance of showers in the morning, then slight chance of showers in the afternoon.
Saturday night..Winds variable less than 10 knots becoming northeast 10 knots after midnight. Wind waves 2 feet or less. Chance of showers in the evening.
Sunday..Northeast winds 10 knots. Wind waves 2 feet or less. Slight chance of showers in the afternoon.
Sunday night..Northeast winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Chance of showers.
PHZ100 328 Am Hst Fri Apr 10 2020
Synopsis for hawaiian coastal waters.. A remnant frontal boundary lies just east of the big island. A front will approach the area Saturday and pass across the area Saturday night and Sunday. High pressure will build in north of the area behind the front. Another front will approach Tuesday.


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 101335 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 335 AM HST Fri Apr 10 2020

SYNOPSIS. An approaching front will bring light to moderate west to southwest winds to most areas into Saturday, bringing a few showers. The front will bring a wind shift to the north, and some increase in rainfall as it stalls over the islands from Saturday afternoon into Sunday. A brief period of trade winds Sunday night and Monday will focus moisture over windward areas. Lighter winds are expected Monday night and Tuesday, with the stalled front continuing to fuel showers. Moderate trade winds are not expected to return until the middle of next week.

DISCUSSION. Large scale pattern near the islands features a surface ridge SE of the Big Island extending from a high to the distant NE, and another ridge extending eastward toward the islands from a high centered W of the Date Line. Several lows are passing well NW and N of the islands, with a dissipating frontal boundary near and NE of the Big Island, and a fast-approaching front about 700 miles NW of Kauai. The prevailing flow is light and from the SW to W, which has allowed land breezes to develop over most areas. Satellite indicates a weakly convergent low-level flow supporting scattered to broken low clouds, with radar detecting a few showers around Oahu and Maui county that are primarily remaining offshore. A short wave trough aloft NW of the islands near 28N 168W is moving rapidly ESE, with an area of increased high clouds E of the trough axis.

This morning's light and variable wind flow will remain in place over the Big Island through at least Saturday, with land and sea breezes driving a diurnal cloud and shower pattern. Elsewhere, the approaching front will support light to moderate SW to W winds. A few showers will develop within this flow into Saturday, with the passing short wave trough aloft expected to briefly and modestly destabilize the island atmosphere as it passes just N of the area today. On the Big Island, afternoon sea breezes may lead to localized vigorous convection today, with a slight chance of thunderstorms.

The weakening front is expected over Kauai Saturday afternoon, stalling over the central portion of the island chain Saturday night and Sunday as high pressure passes quickly from W to E well N of the islands. A few showers will accompany the stalling front, but significant rainfall is not expected as minimal support aloft is expected. The high will bring light to moderate N winds that will quickly shift to a more typical trade wind direction, leading to an increase in trade wind showers Sunday night into Monday.

This passing high is only expected to bring a brief period of trades as a trough develops near the islands along the stalled front, and another approaching front kills the wind again late Monday through Tuesday night. Shower coverage and intensity may increase at this time as some shortwave energy moves overhead. High pressure building N of the area should bring a more robust trade wind flow by Wednesday, with brief showers favoring windward areas.

AVIATION. Light winds will continue through much of the day with overnight land breezes giving way to sea breezes. Skies have cleared in most locations overnight, with VFR conditions prevailing.

A front approaching from the northwest will shift winds to a southerly and westerly direction tonight, with an uptick in winds. Winds will remain light enough in many areas tonight for some more land breezes, but expect an uptick in moisture. Winds will remain lighter over Maui County and the Big Island into tomorrow.

As clouds and showers increase with the approaching front Friday night and Saturday, there could be some areas of MVFR.

No AIRMETs are in effect this morning, and not expected through the day today.

MARINE. A remnant frontal boundary lies east of the Big Island with a ridge just south of the smaller islands. The wind flow around the islands is light and variable this morning with land breezes over near shore waters. Sea breezes near the islands will pick up by late morning.

A weak front approaching from the NW will turn winds from the west near Kauai later today and from the south to southwest elsewhere. Low level winds will become westerly Saturday as the front nears the state. The front is expected to move across the area Saturday night and Sunday with north to northeast winds filling in behind it. An area of high pressure passing north of the area Sunday night through Monday night will bring light to moderate trade winds. Another front approaching from the NW Tuesday may bring a return of light and variable winds over the smaller island coastal waters.

A moderate, short period northwest swell has arrived slightly larger than expected, increasing surf heights to advisory levels for north facing shores of the smaller islands. This swell will peak today, then lower Saturday and Sunday. A series of small, short period north swells will move through the area Saturday through Tuesday. A larger northwest swell is expected to arrive Tuesday night and peak Wednesday. Surf heights may reach advisory levels during this swell. A series of small south swells will continue through the weekend and into next week. Peak surf heights along south facing shores are likely Saturday when the largest of these swells arrive. Due to the lack of trade winds, surf will remain small along east facing shores into early next week. With the expected uptick in trades around Tuesday and Wednesday, surf heights will increase.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory for North and West facing shores of Kauai and for North facing shores of Oahu Molokai Maui and Niihau.



DISCUSSION . Birchard AVIATION . M Ballard MARINE . Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 22 mi60 min SSE 1 G 1.9 72°F 78°F1015.5 hPa
51213 24 mi90 min 77°F3 ft
51205 30 mi60 min 76°F9 ft
51202 - Mokapu Point, HI (098) 80 mi60 min 77°F6 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI22 mi34 minESE 510.00 miFair69°F69°F100%1015.7 hPa
Kahului, Kahului Airport, HI23 mi36 minN 010.00 miFair74°F64°F74%1016.3 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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Last 24hrW5W6W7NW8NW5NW9
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W8NW6W7NW7NW4NW6N6N4NE3NE4CalmE3NE4CalmCalmE4E6E5
1 day agoW443W5W9W7NW10NW7W7W6W11NW5CalmE3E6SE6E6E5S4NE5NE3W6CalmNW3
2 days agoSW6W7W8W4W6W8
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Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
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Kuheia Bay
Click for Map
Fri -- 12:15 AM HST     0.09 feet Low Tide
Fri -- 05:23 AM HST     1.10 feet High Tide
Fri -- 06:11 AM HST     Sunrise
Fri -- 08:29 AM HST     Moonset
Fri -- 11:14 AM HST     -0.25 feet Low Tide
Fri -- 06:26 PM HST     2.14 feet High Tide
Fri -- 06:43 PM HST     Sunset
Fri -- 09:58 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.40.70.91.11.10.90.60.2-0.1-0.2-0.20.10.511.51.92.12.11.91.51.10.7

Tide / Current Tables for Smuggler Cove, Kahoolawe Island, Hawaii
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Smuggler Cove
Click for Map
Fri -- 12:27 AM HST     0.09 feet Low Tide
Fri -- 05:17 AM HST     1.10 feet High Tide
Fri -- 06:11 AM HST     Sunrise
Fri -- 08:30 AM HST     Moonset
Fri -- 11:26 AM HST     -0.25 feet Low Tide
Fri -- 06:20 PM HST     2.14 feet High Tide
Fri -- 06:44 PM HST     Sunset
Fri -- 09:59 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.30.60.91.11.10.90.60.2-0.1-0.2-0.200.511.51.92.12.11.91.51.10.7

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
Wind Forecast for (14,3,4,5)
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Ground Weather Radar Station Kohala, HI
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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.