Saturday, January25, 2020
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Marine Weather and Tides
Wainaku, 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 6:55AMSunset 6:09PM Saturday January 25, 2020 3:37 PM HST (01:37 UTC) Moonrise 7:44AMMoonset 7:10PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PHZ122 Big Island Windward Waters- 930 Am Hst Sat Jan 25 2020
.small craft advisory in effect through Sunday afternoon...
Rest of today..East winds 20 knots. Wind waves 5 feet. Northwest swell 10 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 5 feet. Northwest swell 12 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 5 feet. Northwest swell 11 feet. Isolated showers.
Sunday night..East winds 15 knots. Wind waves 5 feet. Northwest swell 10 feet. Isolated showers.
Monday..East winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet. Isolated showers.
Monday night..Southeast winds 20 knots. Wind waves 6 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 15 knots. Wind waves 6 feet. Northwest swell 7 feet. Isolated showers.
Wednesday..Southeast winds 20 knots. Wind waves 6 feet. Northwest swell 7 to 8 feet. Isolated showers.
PHZ100 930 Am Hst Sat Jan 25 2020
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will keep trade winds in place through early next week. A large northwest swell will build from northwest to southeast down the island chain, peak late this afternoon through tonight, then gradually lower through early next week.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 252000 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1000 AM HST Sat Jan 25 2020

SYNOPSIS. Trade winds will continue through the weekend as a stationary front dissipates over the western end of the state. Winds will shift southeasterly by Monday as a front passes by to the north with land and sea breezes prevailing Tuesday into Thursday. Another front may bring wet weather to the state next weekend.

DISCUSSION. Visible satellite and radar show a low cloud band with light to moderate showers associated with a dissipating front located over and upstream of Oahu this morning. A weak high pressure system behind the front is driving moderate trade winds across the state. The trade winds are focusing the clouds and showers mainly over windward sections of Kauai and Oahu, while most leeward areas remain sunny. Expect some cloud cover and showers to linger through the day, but overall looking at a drying trend over the next 24 hours. Zonal flow aloft is keeping the atmosphere stable with 12Z soundings from Hilo and Lihue showing a strong inversion over the state.

Winds will begin veering east southeasterly on Monday as a weak front passes north of the island chain, however, this feature is not expected to impact the islands directly. Wind speeds will remain at moderate breezes, but will see more blocking (by the Big Island) across smaller islands as the direction becomes parallel to the island chain. Localized land and sea breezes may set up in areas beginning Monday afternoon. Land and sea breezes will become more widespread Tuesday through Thursday as a stronger front approaches and forces the subtropical ridge over Hawaii. Expect afternoon cloud build ups and a few showers over interior sections followed by clearing at night under this weather pattern. Continued stability in the atmosphere will keep showers light and to a minimum.

Both the GFS and ECMWF come into a little bit better alignment with the front reaching Kauai on Friday accompanied by a passing upper trough just north of the area. Both models weaken the front across the central part of the state Saturday night and model solutions begin to diverge from each other beginning Sunday as the upper level feature moves east of the state. For today, will trend the forecast wetter for the western and central portions of the state Friday into Saturday, and will wait for better model agreement after that time.

AVIATION. A weak stationary front is bringing low clouds and showers to windward Kauai and Oahu and the adjacent windward waters. A ridge stretching east to west in the area north of the islands will provide light/moderate trade winds through tonight. Expect isolated to scattered showers along windward coasts and slopes with ISOL MVFR.

A mountain obscuration is in effect for the windward slopes of Oahu this morning. This AIRMET will likely be canceled by noon as partial clearing is expected.

MARINE. A ridge of high pressure north of the area will sustain moderate to locally breezy trade winds across most coastal waters through Monday. Beyond that time frame, a couple of fronts approaching the area from the northwest through next week will weaken the winds and turn them toward the east and southeast. Seas are rising to SCA levels across most of the marine area as a new large northwest swell arrives. Trade winds will also strengthen to SCA levels across some of the windier channel waters and waters south of the Big Island late today through Sunday. An SCA is now in effect for all Hawaiian waters except Maalaea Bay through Sunday due to a combination of winds and seas. Some marine zones will likely hold on to SCA level seas into early next week.

Surf will keep pumping along north and west facing shores as a progressive weather pattern across the northern Pacific keeps a series of large northwest swells moving through the islands, at least through the middle to latter part of next week.

Surf along exposed east facing shores will remain rather small through the period due to the lack of persistent trades locally and upstream across the eastern Pacific.

Surf along south facing shores will remain small through next week. A couple background south swells expected over the weekend and again on Tuesday should be enough to keep things from going flat.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 PM HST Sunday for Niihau-Kauai Windward-Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Molokai-Maui Windward West-Maui Central Valley-Windward Haleakala.

High Surf Advisory from noon today to 6 AM HST Monday for Kona- Kohala.

Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters except Maalaea Bay-



DISCUSSION . Foster AVIATION . Kinel MARINE . Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi50 min NNE 2.9 G 5.1 75°F 79°F1016.8 hPa
51206 6 mi52 min 78°F7 ft
KWHH1 46 mi50 min W 6 G 6 78°F 78°F1016.4 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi45 minNE 410.00 miOvercast80°F64°F58%1018.3 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSE8S4CalmCalmCalmSW3SW3SW3SW3S3SW5SW4SW4CalmN4SW5W4W3CalmE11E6NE8NE6NE4
1 day agoNE8NE5N4CalmNE5SW3SW4CalmSW4SW3SW3CalmSW4SW5SW5SW4CalmSW3CalmE10E7E6E9E8
2 days agoE11SE8S3SW3SW3SW3W5SW5SW5SW4SW4SW6SW7SW7SW7SW7SW6SW5SW5E5E84E56

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 04:42 AM HST     2.51 feet High Tide
Sat -- 07:00 AM HST     Sunrise
Sat -- 07:47 AM HST     Moonrise
Sat -- 11:43 AM HST     0.12 feet Low Tide
Sat -- 04:47 PM HST     0.98 feet High Tide
Sat -- 06:10 PM HST     Sunset
Sat -- 07:12 PM HST     Moonset
Sat -- 10:10 PM HST     -0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.11.72.12.42.52.31.91.40.80.40.20.10.30.50.80.910.90.60.30.1-00

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 (20,4,5,8)
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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.