Tuesday, January21, 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 6:56AMSunset 6:06PM Monday January 20, 2020 7:43 PM HST (05:43 UTC) Moonrise 3:19AMMoonset 2:43PM Illumination 16% Phase: Waning Crescent; Moon at 26 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- 331 Pm Hst Mon Jan 20 2020
.small craft advisory in effect through early Tuesday morning...
Tonight..East winds 20 knots. Wind waves 7 feet. North swell 7 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 6 feet. North swell 6 feet. Isolated showers in the morning.
Tuesday night..Southeast winds 15 knots. Wind waves 5 feet. North swell 5 feet.
Wednesday..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 5 feet increasing to 7 feet in the afternoon.
Wednesday night..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 12 feet. Isolated showers.
Thursday..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 13 feet.
Thursday night..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 12 feet decreasing to 10 feet after midnight. Isolated showers.
Friday..East winds 10 knots. Wind waves 4 feet. Northwest swell 7 to 9 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Northwest swell 10 to 12 feet. Scattered showers.
PHZ100 331 Pm Hst Mon Jan 20 2020
Synopsis for hawaiian coastal waters.. High pressure north of the area will move east southeast over the next couple of days resulting in lighter trade winds. A front will approach the area from the northwest during the middle of the week with winds becoming lighter and favoring a southerly direction.


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 210115 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 315 PM HST Mon Jan 20 2020

SYNOPSIS. Moderate to locally breezy trade winds will diminish tonight, with daytime sea breezes and overnight land breezes then prevailing Tuesday through Friday. Typical trade wind showers will prevail through early Tuesday, with a mostly dry pattern expected through the remainder of the work week, with only a few clouds and showers developing over interior and mountain areas each afternoon. A front is expected to stall and weaken near Kauai Friday night, with trades then returning over the weekend.

DISCUSSION. Currently at the surface, a 1022 mb high centered around 475 miles northeast of Honolulu is driving moderate to locally breezy trade winds across the island chain. Meanwhile, the first in a series of fronts that will approach the islands this week, is located around 1150 miles west-northwest of Kauai, and has just pushed east of Midway Atoll. Visible satellite imagery shows partly to mostly cloudy skies across the state, with cloud cover most prevalent in windward areas and leeward sections of the Big Island. Radar imagery shows a few light showers moving into windward areas, with perhaps some sprinkles or mist reaching some leeward locales. Main short term concern revolves around the diminishing trade winds.

High pressure northeast of the state will shift eastward over the next couple of days as a front approaches from the northwest and passes by several hundred miles north of the island chain. Moderate to locally breezy trade winds early this evening, will diminish overnight into early Tuesday, with land and sea breezes then expected to prevail Tuesday afternoon through Friday. A new front will be approaching the islands from the northwest late in the work week, and is expected to stall near Kauai Friday night. High pressure will build in behind the front to the north of the islands over the weekend, allowing the trade winds to return. The next front approaching the area from the northwest Sunday night into early next week, could disrupt the trade winds once again.

Trade wind showers will continue tonight into Tuesday morning, but the shower coverage should be much less than what occurred last night and this morning. A land/sea breeze pattern is then expected to take hold Tuesday afternoon through Friday. This will bring a rather dry period of weather to the state, with a few showers popping up each afternoon over the interior and mountain areas, with mainly rain free weather at night. An increase in showers will be possible Friday night and Saturday as a front stalls out near Kauai and the trade winds begin to return. Shower coverage will likely be the highest across Kauai, particularly windward areas, although some increase in windward showers will be possible across windward sections of the other islands as well. Fairly typical trade wind weather should then continue through the remainder of the weekend, with a land/sea breeze pattern potentially setting up again early next week.

AVIATION. Clouds and showers have been slower to clear out than expected across the area today. Radar imagery has been showing a decrease in shower activity over the past few hours, but some brief MVFR conditions are still possible, primarily for windward areas. Additionally, a few windward sites have been reporting MVFR ceilings, but do not think cloud cover is widespread enough or will last long enough to justify the issuance of AIRMET Sierra for tempo mountain obscuration.

As winds become lighter over the next several hours as the high that has been driving our breezy trades moves away, expect AIRMET Tango for tempo moderate low level turbulence below 7,000 feet will be cancelled.

MARINE. High pressure is currently centered several hundred miles northeast of the state resulting is breezy trade winds across the area. A Small Craft Advisory (SCA) is currently posted for most waters around Maui County and the Big Island due to a combination of breezy trade winds and rough seas. The high will move off to a position far to the east-northeast of the area over the next couple of days with trade winds becoming lighter. By midweek, a front will be approaching the area from the northwest. Winds will become south to southeast and remain on the lighter side as the front stalls northwest of the area. However, large northwest swells will likely cause seas to reach SCA levels over exposed waters at times. A new high is forecast to build in north of the area late Friday and Saturday with trade winds returning.

The current north-northwest swell will continue to lower tonight and Tuesday. A rather active period for high surf is expected this week as strong low pressure systems pass across the North Pacific over the next several days. These low pressure systems will be rather robust swell producers. A large and very long period northwest swell is expected to begin arriving Tuesday night. This swell is expected to build on Wednesday, peak Wednesday night, then lower gradually Thursday through Friday. Latest guidance indicates that surf heights will likely reach High Surf Warning levels along most north and west facing shores during the peak of this swell. Another large northwest swell is expected to build late Friday and Friday night, peak on Saturday, then lower gradually Saturday night through Sunday. Warning level surf is once again expected during the peak of this swell.

Only small background south swells are expected through the week and on into the weekend. With the expected drop off in trade winds over the next few days, short period choppy surf will diminish along east facing shorelines. However some south and east facing shores may see some localized higher surf this week from the large northwest swells refracting around islands and reefs.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Tuesday for Maui County Windward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel- Big Island Windward Waters-Big Island Leeward Waters-Big Island Southeast Waters.



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 mi62 min 72°F 79°F1018.8 hPa
51206 7 mi58 min 77°F10 ft
KWHH1 45 mi56 min 79°F 78°F1016.7 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 mi51 minSW 510.00 miPartly Cloudy71°F63°F76%1020.3 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW4SW4SW4SW5CalmSW7SW6CalmSW7SW4SW7SW5SW6SW4NE4SE7S3E8E9E9E9SE83SW5
1 day agoNW10NE9N10NE5NW10NW9NW7NW10NE5NE10NW6W5W4E3SW5N7N10N12N9N10N10N8N4W6
2 days agoN9N10N7N10N8NW11N10NW9N12
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NW6N6NW9NW5NW7N8N11N9N12N12N10N9N10N9N10
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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
Tue -- 02:11 AM HST     2.41 feet High Tide
Tue -- 04:21 AM HST     Moonrise
Tue -- 07:00 AM HST     Sunrise
Tue -- 09:28 AM HST     0.35 feet Low Tide
Tue -- 01:51 PM HST     0.81 feet High Tide
Tue -- 03:36 PM HST     Moonset
Tue -- 06:08 PM HST     Sunset
Tue -- 07:22 PM HST     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.92.32.42.32.11.71.20.80.50.40.40.50.60.80.80.70.50.30.1-0.1-00.20.61.1

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 (0,6,7,8)
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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.