Saturday, March28, 2020
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Marine Weather and Tides
Wailuku, 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 6:20AMSunset 6:40PM Saturday March 28, 2020 9:51 AM HST (19:51 UTC) Moonrise 9:15AMMoonset 10:33PM Illumination 22% 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- 908 Am Hst Sat Mar 28 2020
.small craft advisory in effect through late this afternoon...
Rest of today..North winds to 25 knots. Wind waves 2 feet or less. Slight chance of Thunderstorms and isolated heavy showers.
Tonight..North winds to 25 knots. Wind waves 2 feet or less. Slight chance of Thunderstorms and isolated heavy showers.
Sunday..North winds 20 knots. Wind waves 2 feet or less. Slight chance of Thunderstorms and isolated heavy showers.
Sunday night..North winds 20 knots. Wind waves 2 feet or less. Scattered showers in the evening.
Monday..North winds 20 knots. Wind waves 2 feet or less.
Monday night..North winds 15 knots. Wind waves 2 feet or less.
Tuesday..North winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Wednesday..North winds 15 knots. Wind waves 2 feet or less. Isolated showers.
PHZ100 908 Am Hst Sat Mar 28 2020
Synopsis for hawaiian coastal waters.. A surface trough west of kauai will bring locally heavy showers and a few Thunderstorms before dissipating by Monday. Otherwise, high pressure far north of the islands will move southeast through Wednesday.


7 Day Forecast for Marine Location Near Wailuku, HI
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location: 20.9, -156.49     debug


Area Discussion for -
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FXHW60 PHFO 281946 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 946 AM HST Sat Mar 28 2020

SYNOPSIS. An approaching upper low will trigger heavy rainfall across portions of the main Hawaiian Islands through the weekend. Trade winds will focus showers over windward and mauka areas, with heavy showers and thunderstorms possible leeward mainly during the afternoon and evening hours. A brief return to a trade wind pattern is expected early next week, followed by a land and sea breeze pattern Wednesday and Thursday. Another switch to trade wind weather is then possible by the end of the week.

DISCUSSION. A surface trough is located just west of Kauai, while a high is centered far north of the islands. Water vapor imagery shows an upper low west-northwest of Kauai. Scattered to patchy broken low clouds are noted across most of the state, but deep convection over and just east of eastern Kauai continues. Radar shows heavy rainfall over windward sections of Kauai and Oahu, with isolated to scattered windward showers across Maui County and the Big Island.

The trough near Kauai will shift westward through Sunday, while the high to our north slides eastward. This should keep moderate to fresh trade winds blowing across most of the state, although the flow may veer east-southeast enough across the western islands to allow for localized sea breeze development today. The high will weaken as it moves, allowing trades to diminish to light to moderate levels. Trades may become light enough for land and sea breeze development in more sheltered areas Wednesday and Thursday. Trades will strengthen late next week as as another high develops far northwest of the islands.

Instability associated with the upper low will increase heavy rainfall and thunderstorm potential over the next couple of days. The greatest threat will remain over Kauai and Oahu today and tonight, but locally heavy showers and isolated thunderstorms will remain possible across Maui County and the Big Island as well. A Flash Flood Watch remains in effect for Niihau, Kauai and Oahu through 6 AM Sunday, where the flash flood threat is the greatest. At this time, the greatest threat for flash flooding across Maui County and the Big Island is expected to hold off until Sunday, and the Flash Flood Watch may eventually need to be expanded to include these areas at some point later today or tonight.

By Sunday night, the strongest upper forcing appears to be east of the islands. This should bring a return of more typical trade wind weather featuring mainly windward and mauka showers, with the occasional leeward spillover, through Tuesday. Lighter winds Wednesday and Thursday may result in a land/sea breeze pattern across much of the state, with showers favoring windward coasts at night and interior/mauka areas during the afternoon and early evening. Models suggest a return to trade flow again by Friday.

AVIATION. The threat for heavy showers and thunderstorms will continue through the weekend as an upper low drifts southward into the area and a surface trough remains near the western end of the state. Although much of the shower coverage will focus over windward and mountain areas with the breezy trades still in place, more widespread coverage will persist for Kauai and Oahu where better instability exists. IFR to MVFR CIG/SHRA are expected in and around the heavy showers and storms that develop.

AIRMET SIERRA remains effect for the entire island of Kauai and windward areas of Oahu, Maui and the Big Island for mountain obscuration above 1000 feet for Kauai and 2000 feet elsewhere. Expect this pattern to continue through tonight.

AIRMET Tango continues for moderate turbulence between FL250 and FL400 over Maui County and the Big Island, but is likely able to be cancelled later today as the turb area moves off to the east. However, some upper level turbulence may develop near and just west of Kauai later this afternoon or this evening as the upper low nears.

MARINE. A low aloft NW of the islands has induced a surface trough just W of Kauai, with these features triggering heavy showers and thunderstorms over waters from Oahu westward. Meanwhile, high pressure to the distant N continues to support moderate to locally strong trade winds near and upstream of the islands. The low aloft is expected to gradually weaken through Sunday, with the potential for heavy showers gradually easing.

A Small Craft Advisory remains in effect today for many zones due to a combination of winds and seas, and an extension in time is likely for at least some areas as winds and seas will only gradually diminish through the weekend. A High Surf Advisory for east facing shores posted through today will also likely be extended through the weekend. No other significant swells are expected, with a small WNW swell expected Tuesday through Thursday, and small S to SE swells through the period.

HFO WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch through late tonight for Niihau-Kauai-Oahu.

High Surf Advisory until 6 PM HST this evening for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West- Windward Haleakala-South Big Island-Big Island North and East.

Small Craft Advisory until 6 PM HST this evening for Kauai Windward Waters-Kauai Channel-Oahu Windward Waters-Kaiwi Channel- Maui County Windward Waters-Maalaea Bay-Pailolo Channel- Alenuihaha Channel-Big Island Windward Waters-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Powell AVIATION . TS MARINE . Birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 1 mi52 min NE 18 G 21 74°F 74°F1017.2 hPa (+1.2)
51205 9 mi52 min 75°F8 ft
51213 29 mi52 min 76°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI3 mi58 minS 610.00 miA Few Clouds77°F62°F60%1017.6 hPa
Lahaina - West Maui, HI11 mi67 minN 710.00 miPartly Cloudy77°F62°F61%1017.3 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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NE11E8SE6E7CalmN3E5CalmSE7CalmSE4CalmS7S6NE13
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SE6E4--SW5S3CalmE12
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Tide / Current Tables for Kahului, Kahului Harbor, Hawaii (2)
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Kahului
Click for Map
Sat -- 04:06 AM HST     1.26 feet High Tide
Sat -- 06:21 AM HST     Sunrise
Sat -- 09:14 AM HST     Moonrise
Sat -- 10:16 AM HST     0.25 feet Low Tide
Sat -- 05:20 PM HST     1.94 feet High Tide
Sat -- 06:39 PM HST     Sunset
Sat -- 10:33 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.811.21.31.21.10.80.60.40.30.30.50.81.21.51.81.91.91.81.51.20.90.8

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sat -- 12:37 AM HST     0.36 feet Low Tide
Sat -- 05:58 AM HST     1.16 feet High Tide
Sat -- 06:22 AM HST     Sunrise
Sat -- 09:14 AM HST     Moonrise
Sat -- 11:35 AM HST     0.05 feet Low Tide
Sat -- 06:39 PM HST     Sunset
Sat -- 07:12 PM HST     1.84 feet High Tide
Sat -- 10:33 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.70.91.11.21.10.90.60.30.10.10.20.40.81.21.51.71.81.81.61.30.9

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
Wind Forecast for (15,3,4,5)
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Ground Weather Radar Station Molokai, 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.