Thursday, April9, 2020
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Marine Weather and Tides
Hilo, 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 6:05AMSunset 6:38PM Thursday April 9, 2020 1:42 PM HST (23:42 UTC) Moonrise 8:47PMMoonset 7:37AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 950 Am Hst Thu Apr 9 2020
Rest of today..South winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Tonight..South winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Friday..South winds 15 knots. Wind waves 3 feet. North swell 6 feet. Scattered showers.
Friday night..South winds 10 knots. Wind waves 3 feet. North swell 5 feet. Scattered showers through the night.
Saturday..South winds 10 knots. Wind waves 3 feet. North swell 4 feet. Chance of showers in the morning, then slight chance of showers in the afternoon.
Saturday night..South winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 3 feet. North swell 4 feet. Chance of showers.
Sunday..Winds variable less than 10 knots becoming northeast 10 knots. Wind waves 3 feet. Northwest swell 4 to 5 feet. Chance of showers.
Monday..East winds 10 knots. Wind waves 4 feet. North swell 4 feet. Scattered showers.
PHZ100 950 Am Hst Thu Apr 9 2020
Synopsis for hawaiian coastal waters.. A weakening frontal boundary lies near maui county while a surface ridge lies just se of the big island. A front will approach the area on Saturday and pass across the area Saturday night and Sunday. High pressure will build in north of the area behind the front.


7 Day Forecast for Marine Location Near Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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FXHW60 PHFO 091933 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 933 AM HST Thu Apr 9 2020

SYNOPSIS. Light and variable winds will persist through Friday, with clouds and showers over the islands most likely in the afternoon and evening. An increase in west winds is expected Friday into Saturday as a front approaches from the northwest. The front will bring a wind shift to the north, and a few showers, as it moves down the island chain Saturday night and Sunday. Light to moderate trade winds will begin to return late Sunday and continue through much of next week.

DISCUSSION. Currently at the surface, high pressure systems are located far to the west and northeast of the islands, with an area of low pressure well to the north of the state. Closer to home, a weakening frontal boundary remains over the central islands. The resulting pressure gradient remains quite weak, with land breezes beginning the transition over to sea breezes. Visible satellite imagery shows partly cloudy conditions in most areas, although there area a few areas where cloud cover is more prevalent. Radar imagery shows a few light showers across the state, with most areas rain free at the moment. Main short term concern revolves around rain chances the next few days.

The weak frontal boundary will slide slowly eastward today and tonight, then dissipate by Friday. This will keep a light wind regime in place, featuring daytime sea breezes and overnight land breezes. A new cold front will approach from the northwest Friday through Saturday, bringing an increase in west to southwest winds. The front will slide southeastward across the island chain Saturday night and Sunday, with moderate north winds filling in behind the front Saturday night and shifting around to northeasterly trades on Sunday. High pressure will slide by to the north of the islands Sunday night and Monday, with light to moderate trades prevailing. The trades are expected to ease again Monday night through Tuesday night as surface troughing develops over the islands. Moderate trades are then expected to return Wednesday and continue through late in the week.

As for weather details, a sea/land breeze pattern is expected to continue through Friday, with showers favoring interior mauka areas during the afternoon/evening and locations near the coast at night and during the morning hours. An approaching shortwave trough may de-stabilize things enough for a thunderstorm over the Big Island Friday afternoon, so will mention a slight chance of thunderstorms here. Shower coverage should increase a bit Friday night and Saturday in the low level convergent flow ahead of the approaching front, with assistance from shortwave energy moving overhead. Showers will favor south and southwest facing slopes at night and during the morning hours and interior/mauka locations during the afternoon. A few showers will accompany the front as it slides southeastward through the islands Saturday night and Sunday, but no significant rainfall is expected. We should begin to see an increase in trade wind showers Sunday night and Monday, favoring the typical windward areas. Shower coverage and intensity may then increase Monday night through Tuesday night as surface troughing develops over the islands and some shortwave energy moves overhead. A more typical trade wind pattern should then return by the middle and latter part of next week.

AVIATION. Cloud cover over Maui County continues to thin out and showers that had been impacting portions of the Big Island early this morning have fizzled out. Currently, an area of heavier showers sits about 100 miles east of the Big Island, but things are quiet elsewhere. However, we will see an uptick in afternoon clouds and showers for interior areas thanks to the afternoon sea breezes. Tempo MVFR conditions are possible with any heavier showers that do develop, but expect VFR to prevail.

Land breezes will take over again tonight and clouds and showers will dissipate. No AIRMETs are currently in effect and none are anticipated.

MARINE. An eastward moving and dissipating frontal boundary lies near Maui while the west end of a ridge of high pressure lies just southeast of the Big Island. The overall wind flow is light west- northwest west of the boundary with slightly stronger south and southwest winds out ahead of the boundary, mainly over the waters around the Big Island. Expect generally light winds west of the boundary today with slightly stronger winds east of the boundary. Sea breezes will develop nearshore across most areas today with land breezes developing nearshore tonight.

Winds will remain light Friday and Friday night, favoring a south to southwest direction, as another weak front approaches the area from the northwest. Low level winds will become more westerly on Saturday as the front nears the state. Guidance indicates a weak frontal boundary will pass the area Saturday night and Sunday with north to northeast winds filling in behind it. An area of high pressure will be passing by north of the area Sunday night through Monday night with moderate trade winds returning.

A small, short period northwest swell will continue to fill in today, peak on Friday, then lower gradually Saturday and Sunday. A series of very small, short period north swells will move through the area Saturday through Tuesday. A larger northwest swell is expected to arrive Tuesday night, peak Wednesday and Wednesday night, then lower gradually on Thursday. Surf heights may approach low end advisory levels during the peak of this swell. A series of small south swells will be moving through the area through the weekend and on through the middle of next week. Peak surf heights will likely be on Saturday when the largest of these swells arrive. Due to the lack of trade winds, surf will remain small along east facing shores on into early next week. With the expected uptick in trades around Tuesday and Wednesday, surf heights are expected to gradually pick up at that time.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Jelsema AVIATION . Dye MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi132 min NNE 4.1 G 7 77°F 77°F1014 hPa
51206 7 mi116 min 77°F5 ft
KWHH1 45 mi132 min WNW 6 G 7 76°F 79°F1015.9 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, HI1 mi49 minNNE 710.00 miOvercast81°F69°F67%1014.6 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrE744E7E6S3S3S3S3S5CalmS4S4CalmCalmCalmSW5SW6CalmN7N6NE8NE9N7
1 day agoSE11S8S8SE7S8SE7E5CalmE8CalmCalmS4SW3E6SW4E3S5CalmCalmS4CalmE3E4NE5
2 days agoE14E16SE7SE5SE6S5S3SE3S6CalmS4CalmS3SW4SW5SW5SW4SW6CalmSE44SE10SE8SE10

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
Thu -- 04:55 AM HST     1.62 feet High Tide
Thu -- 06:09 AM HST     Sunrise
Thu -- 07:39 AM HST     Moonset
Thu -- 10:55 AM HST     -0.20 feet Low Tide
Thu -- 05:40 PM HST     2.40 feet High Tide
Thu -- 06:40 PM HST     Sunset
Thu -- 08:51 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.40.81.21.51.61.51.10.70.2-0.1-0.2-00.40.91.522.32.42.21.71.20.70.4

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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Ground Weather Radar Station Kohala, 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.