Sunday, January19, 2020
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Marine Weather and Tides
Paia, 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 7:03AMSunset 6:09PM Sunday January 19, 2020 4:07 AM HST (14:07 UTC) Moonrise 2:27AMMoonset 1:59PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 302 Am Hst Sun Jan 19 2020
.small craft advisory in effect through early Monday morning...
Today..North winds to 30 knots. Wind waves 4 feet.
Tonight..North winds to 25 knots. Wind waves 4 feet.
Monday..North winds to 25 knots. Wind waves 3 feet.
Monday night..Northeast winds 20 knots. Wind waves 3 feet.
Tuesday..Winds variable less than 10 knots. Wind waves 3 feet in the morning then 2 feet or less.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less.
Thursday..Winds variable less than 10 knots. Wind waves 2 feet or less.
PHZ100 302 Am Hst Sun Jan 19 2020
Synopsis for hawaiian coastal waters.. A high northwest of the area will move east through the week. A ridge trailing southwest from the high will shift south over the area Wednesday and persist through Thursday.


7 Day Forecast for Marine Location Near Paia, HI
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location: 20.9, -156.36     debug


Area Discussion for -
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FXHW60 PHFO 191329 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 329 AM HST Sun Jan 19 2020

SYNOPSIS. Locally breezy trade winds will continue through the holiday weekend as surface high pressure passes north of the state. Stable conditions will produce only light showers across windward areas of Kauai and Oahu, while modest showers will persist on windward Big Island and Maui. Trades will diminish and shift southeasterly on Tuesday, followed by a stable land and sea breeze pattern Wednesday through Friday as a front stalls near Kauai. Trade winds will rebuild Saturday.

DISCUSSION. A stable and breezy northeasterly trade wind flow continues. The trades are being driven by a 1025 mb surface high centered about 650 miles northwest of the state, and a mid level ridge building in from the west is maintaining very stable conditions with an inversion ranging from about 4,000 to 6,000 ft. Stable stratocumulus clouds are piled up along windward slopes and waters from Kauai to Molokai, where mostly dry conditions will hold today. A small pocket of moisture moving onto windward slopes of east Maui and the Big Island, will produce light to moderate showers through mid morning, then diminish. Aside from spotty afternoon showers over South Kona and Kau slopes, leeward areas will be dry today.

A stable, rather dry, and breezy trade wind flow will dominate over most areas through the remainder of the holiday weekend. Surface high pressure will passing north of the state will produce locally breezy trades, and mid level ridging will maintain stable conditions with a strong low level inversion. Showers will remain slightly active through the Martin Luther King Jr holiday across windward slopes of the Big Island and Maui, with a few afternoon showers on Kona slopes. Otherwise, at times extensive cloud cover over windward areas will only produce light showers, while leeward weather will remain dry. With dew points hovering in the upper 50s to lower 60s in the breezy trades, it will feel cool, even though temperatures will be close to January normal.

Trades will gradually decline on Monday night and shift southeasterly on Tuesday as the surface high moves off to the east. Stable trade wind weather will persist, with light showers confined to windward slopes and afternoon sea breezes possible.

Trades will likely be disrupted Wednesday through Friday as an approaching front pushes the surface ridge over the islands. A stable land and sea breeze pattern is expected over most of the state, featuring afternoon clouds and isolated showers over island interior sections followed by clearing overnight. The GFS and ECMWF are showing slight differences in the progression of the weak and shallow front. The GFS has the feature reaching Kauai on Friday and stalling near Oahu on Saturday, while the ECMWF stalls the front on Kauai's doorstep Saturday. The current extended forecast is a blend of these models, keeping higher shower chances near Kauai on Friday into Saturday and rebuilding trade winds state-wide on Saturday.

AVIATION. The area of clouds and showers affecting windward sections of the Big Island, Maui, and Molokai, is dissipating. Satellite imagery now shows stable stratocumulus clouds affecting all islands. Some light showers and or drizzle are expected with these clouds. Surface observations indicate a high based stratocu deck around 4k feet. The inversion ranged from 5 to 6k feet from Kauai to Molokai, to 7k feet over Maui, to 8k feet over the Big Island. We are expecting a predominant VFR situation today with even less showers than yesterday.

AIRMET Tango for low level turb below 7k feet, will continue through at least 04z, as a 1025 mb surface high passes north of the islands tonight and Monday. The NE low level wind flow will veer a little more east on Monday.

MARINE. A high northwest of the area will move east through the week. This high continues to produce strong to near-gale force trade winds over the Hawaii coastal waters. A Small Craft Advisory (SCA) is in effect for all Hawaiian waters through Sunday tonight due to a combination of the strong winds and elevated seas. As the high moves farther east, winds will shift out the east and weaken below SCA speeds by Tuesday. On Wednesday a ridge will shift south over the coastal waters. Winds speeds will become gentle to moderate and wind directions variable.

The strong trade winds are producing moderate rough surf along north and east facing shores. This surf will subside later in the week as the trades weaken.

A new swell building today may boost surf to High Surf Advisory levels along north and west facing shores this afternoon into Monday. This swell will gradually lower from late Monday through Tuesday.

A very large northwest swell building on Wednesday may produce surf reaching the High Surf Warning threshold. As that swell subsides, an even larger northwest swell may arrive next weekend.

Surf will remain small along south facing shores.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Monday for all Hawaiian waters.



DISCUSSION . Wroe AVIATION . H Lau MARINE . Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 6 mi56 min ENE 12 G 17 73°F 75°F1018.4 hPa
51205 9 mi38 min 77°F9 ft
51202 - Mokapu Point, HI (098) 78 mi38 min 77°F8 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI4 mi14 minNE 1210.00 miMostly Cloudy71°F57°F61%1018.6 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrNE15NE13NE12NE10N15NE13N14N16NE17NE19N17NE22NE17E10NE13NE7NE10
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1 day agoW4CalmN7N8--E5NE10N10NE10NE12NE16NE16N18NE21NE19NE14
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2 days agoS5CalmS3SE6SE4CalmNW7NE13NE11
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N10NW8NW8N6N5CalmS4SE3CalmS4CalmCalmS4SE3Calm

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sun -- 02:28 AM HST     Moonrise
Sun -- 06:07 AM HST     1.29 feet Low Tide
Sun -- 07:05 AM HST     Sunrise
Sun -- 09:09 AM HST     1.38 feet High Tide
Sun -- 01:59 PM HST     Moonset
Sun -- 04:43 PM HST     -0.02 feet Low Tide
Sun -- 06:08 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.91.81.61.41.31.31.31.41.41.41.210.80.50.20-00.10.40.81.31.72

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii (2)
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Kahului
Click for Map
Sun -- 02:28 AM HST     Moonrise
Sun -- 06:09 AM HST     0.81 feet Low Tide
Sun -- 07:05 AM HST     Sunrise
Sun -- 09:42 AM HST     1.21 feet High Tide
Sun -- 01:59 PM HST     Moonset
Sun -- 04:10 PM HST     0.11 feet Low Tide
Sun -- 06:08 PM HST     Sunset
Sun -- 11:43 PM HST     2.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.21.91.61.31.10.90.80.911.21.21.110.70.40.20.10.20.40.81.31.82.22.4

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 (9,2,3,4)
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Ground Weather Radar Station Molokai, 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.