Sunday, January17, 2021
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Marine Weather and Tides
Laupahoehoe, 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 6:56AMSunset 6:04PM Saturday January 16, 2021 7:38 PM HST (05:38 UTC) Moonrise 9:51AMMoonset 9:38PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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- 349 Pm Hst Sat Jan 16 2021
.small craft advisory in effect through Sunday afternoon...
Tonight..Southeast winds 20 knots. Wind waves 6 feet. Northwest swell 18 feet decreasing to 16 feet after midnight. Scattered showers.
Sunday..Southeast winds 15 knots. Wind waves 5 feet. Northwest swell 13 feet decreasing to 11 feet in the afternoon. Scattered showers.
Sunday night..South winds 10 knots. Wind waves 4 feet. Northwest swell 10 feet decreasing to 8 feet after midnight. Scattered showers.
Monday..North winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet increasing to 11 feet in the afternoon. Heavy showers likely and slight chance of Thunderstorms.
Monday night..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 13 feet. Heavy showers likely and slight chance of Thunderstorms.
Tuesday..Northeast winds 15 knots. Wind waves 7 feet. Northwest swell 12 feet. Showers likely.
Tuesday night..East winds 15 knots. Wind waves 4 feet. Northwest swell 10 feet. Showers likely.
Wednesday..East winds 15 knots. Wind waves 5 feet. North swell 7 to 9 feet. Showers likely.
Thursday..East winds 15 knots. Wind waves 5 to 6 feet. Northwest swell 4 to 6 feet. Scattered showers.
PHZ100 349 Pm Hst Sat Jan 16 2021
Synopsis for hawaiian coastal waters.. A ridge will linger near the islands through tonight. A giant northwest will continue to move down the island chain tonight, then gradually decline on Sunday. A strong front is expected to move through the islands Sunday and Monday. The front will likely stall over the eastern half of the state initially, with associated moisture drifting west later in the week as the front dissipates.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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FXHW60 PHFO 170224 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 424 PM HST Sat Jan 16 2021

SYNOPSIS. Wet weather is on the way as a strong cold front approaches the state Sunday into Monday. This front will quickly advance down the island chain Sunday night, then stall around the Big Island Monday through Tuesday. Heavy showers and isolated thunderstorms will be possible along and ahead of this front. Cool and strong northerly winds are expected following the frontal passage over the western end of the state early next week. Trade winds may return late next week.

DISCUSSION. As a strong cold front approaches the state Sunday, we will see the winds shift toward the south and southwest on Sunday. By Sunday afternoon, the front is expected just northwest of Kauai and will begin to bring the threat of heavy rain and isolated thunderstorms. The cold front is expected to continue to move down the island chain Sunday night through Monday with the threat of heavy rain and isolated thunderstorms along and ahead of the front.

Right behind the front, we will see gusty northerly winds (potentially reaching advisory levels beginning Sunday night) and cool conditions will follow with dewpoints dipping into the 50s for Kauai and Oahu.

There remains subtle differences in the global models on how far east the front will progress before stalling. But the GFS and ECMWF remains in fairly good agreement with he front stalling near Maui or the Big Island. Either way, the Big Island and Maui will remain rather wet on into Wednesday, which could result in localized flooding concerns.

Winter weather conditions are also expected over the Big Island summits as early as Monday, but more likely by Monday night into midweek due to a combination of the deep moisture axis associated with the front hanging up or stalling and cold temperatures aloft arriving with the shortwave trough. A Winter Storm Watch could be possible for the summits if the boundary looks to set up over the Big Island.

As we head on into Thursday, high pressure will build in northeast of the area resulting in strengthening trade winds. Moisture associated with the frontal boundary is then forecast to move back westward likely providing for a wet trade wind pattern to set up across the state. With the differences in the long range models continuing, changes to the forecast our possible next week.

AVIATION. Light to moderate easterly trades will persist through this afternoon, then shift to southeasterly tonight ahead of an approaching frontal system. Expect shower activity to increase slightly tonight, as moisture deepens, with brief periods of MVFR ceilings and visibility possible.

By late in the day on Sunday, the aforementioned front will begin to push across Kauai and bring scattered to numerous showers and a slight chance of thunderstorms.

No AIRMETs are currently in effect.

MARINE. In summary, expect giant surf to continue through the island chain tonight and decline tomorrow. A potent cold front will move down the island chain late tomorrow night into Monday. Another large NW swell will fill in Monday.

High Surf Warning is in effect as the largest NW swell of the winter season rapidly moves down the island chain, with peak surf heights of 40 to 50 feet (with locally higher waves) along exposed shores tonight and into tomorrow. PacIOOS Waimea buoy swell heights and period have been on the rise all day and currently at 16 feet 18 seconds. Offshore NDBC 51001/51101 buoys have started to show a slow decline in swell height which are now running in the 18 feet 17 second range. The swell may have peak already for Kauai. The swell is still anticipated to peak late this afternoon to early evening for Oahu, and in the evening for Maui. A High Surf Advisory remains in effect for exposed N and W facing shores of the Big Island as the swell is expected to peak locally overnight. The swell will gradually diminish from NW to SE tonight through Sunday night, but a new NW swell arriving Monday will likely push surf to warning levels once again, with peak surf heights lower than today's swell.

The Small Craft Advisory is still in effect for most waters except Maalaea Bay, as E/SE winds have eased below SCA criteria, but seas continue to build around the islands due to the giant NW swell moving through the island chain. A Marine Weather Statement is in effect due to the potential for surges and significant wave action in and near exposed harbors. Due to the period and size of the NW swell, some (much reduced) swell may wrap into select S and E facing shores.

A vigorous cold front will rapidly approach the islands from the NW, tomorrow and tomorrow night, providing a brief period of light to moderate S to SW winds. The front will initially bring the potential for locally heavy showers and slight chance of thunderstorms as it moves relatively quickly through Kauai and Oahu Sunday night, and then slows to a stall and dissipates over Maui County and the Big Island Monday. A Gale Watch is in effect for all coastal waters around the smaller islands as a strong high to the NW of the islands will continue to support strong to gale force NE winds behind the front. The moisture from the dissipated frontal boundary may retrograde back west Tuesday as an upper level trough moves over the islands from the NW. This setup may increase the potential for heavy showers trade showers and thunderstorms along the remnant boundary through mid-week.


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-Olomana-Molokai-Maui Windward West-Maui Central Valley- Windward Haleakala.

High Surf Advisory until 6 PM HST Sunday for Kona-Big Island North and East-Kohala.

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

Gale Watch from Sunday evening through late Monday night for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters- Kaiwi Channel-Maui County Windward Waters-Maui County Leeward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel.



DISCUSSION . Kino AVIATION . Thomas MARINE . Almanza


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi50 min SSW 2.9 G 5.1 73°F 79°F1015.2 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI84 mi45 minSSW 310.00 miFair73°F65°F76%1016.4 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW3SW3CalmCalmSW4SW6SW6SW8SW7SW7SW7SW4CalmCalm3E4E11E10S9E10SE11SE9SE7S3
1 day agoS5SW4SW6SW4SW5SW6SW4SW5SW4SW6SW5SW6SW6SW35CalmE7SE10E10E12SE11SE9SE3SW3
2 days agoW3SW3S4SW4SW3SW6SW6SW6SW5SW7SW6SW6SW6SW4SE5SE7S7E8SE9
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Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Sun -- 05:56 AM HST     2.37 feet High Tide
Sun -- 06:57 AM HST     Sunrise
Sun -- 10:28 AM HST     Moonrise
Sun -- 01:19 PM HST     0.25 feet Low Tide
Sun -- 06:03 PM HST     Sunset
Sun -- 07:07 PM HST     1.42 feet High Tide
Sun -- 10:32 PM HST     Moonset
Sun -- 11:52 PM HST     0.65 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.81.21.622.32.42.321.61.10.70.40.30.30.50.81.11.31.41.41.20.90.7

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Sun -- 06:09 AM HST     2.50 feet High Tide
Sun -- 06:57 AM HST     Sunrise
Sun -- 10:28 AM HST     Moonrise
Sun -- 12:58 PM HST     0.49 feet Low Tide
Sun -- 06:03 PM HST     Sunset
Sun -- 06:23 PM HST     1.41 feet High Tide
Sun -- 10:32 PM HST     Moonset
Sun -- 11:50 PM HST     0.51 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.611.522.32.52.42.11.71.20.80.60.50.60.811.31.41.41.210.80.6

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




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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.