Tuesday, January28, 2020
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Marine Weather and Tides
Hawi, 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 7:02AMSunset 6:15PM Tuesday January 28, 2020 6:55 PM HST (04:55 UTC) Moonrise 9:45AMMoonset 9:44PM Illumination 18% 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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PHZ121 Alenuihaha Channel- 348 Pm Hst Tue Jan 28 2020
Tonight..East winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Scattered showers after midnight.
Wednesday..East winds 20 knots. Wind waves 7 feet. Northwest swell 7 feet. Isolated showers in the morning.
Wednesday night..East winds 15 knots. Wind waves 6 feet. Northwest swell 8 feet. Isolated showers.
Thursday..East winds 15 knots backing northwest in the afternoon. Wind waves 6 feet. Northwest swell 7 feet.
Thursday night..Winds variable less than 10 knots becoming east 10 knots after midnight. Wind waves 5 feet. Northwest swell 7 feet. Isolated showers after midnight.
Friday..Northeast winds 10 knots. Wind waves 5 feet. Northwest swell 8 feet. Isolated showers.
Friday night..East winds 15 knots. Wind waves 6 feet. Northwest swell 9 feet. Isolated showers.
Saturday..East winds 20 knots. Wind waves 6 feet. Northwest swell 7 to 8 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 5 to 6 feet. North swell 5 to 7 feet. Isolated showers.
PHZ100 348 Pm Hst Tue Jan 28 2020
Synopsis for hawaiian coastal waters.. A ridge will sit just north of the state through Wednesday before slowly shifting over the island chain Thursday, ahead of an approaching front. The front will stall and dissipate over the state Friday as a surface high pressure system builds north of the area.


7 Day Forecast for Marine Location Near Hawi, HI
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location: 20.41, -156.09     debug


Area Discussion for -
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FXHW60 PHFO 290203 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 403 PM HST Tue Jan 28 2020

SYNOPSIS. Stable and rather dry conditions will persist through Thursday, featuring light and variable winds across the western half of the state and east to southeast winds with light windward showers on the Big Island. A front will stall near Kauai on Friday, bringing wet and unsettled conditions across the western end of the state into Saturday as trade winds rebuild. Trades will veer southeasterly again early next week.

DISCUSSION. A stable and rather dry conditions persist. With the subtropical ridge sitting within 200 miles north of Kauai, easterly trade winds across the Big Island quickly veer southeasterly, placing the western half of the island chain in the wind shadow of the Big Island and allowing sea breezes to prevail this afternoon. A mid level ridge overhead is maintaining very stable conditions and a strong inversion, while precipitable water around the state remains below January normal. Aside from modest showers along windward Big Island slopes, scant rainfall has been recorded during the past 24 hours, and little is expected through the remainder of the day.

Stable and rather dry conditions will dominate through Thursday. An approaching front will push the subtropical ridge over the islands by late Wednesday, further weakening and veering the background flow and allowing land and sea breezes to dominate. The mid level ridge will remain in place overhead and maintain stable conditions. As a result, expect light windward showers to favor Big Island and east Maui, and the rest of the state will be under a stable land and sea breeze pattern, featuring afternoon clouds and a few light showers followed by clearing at night.

Wet and unsettled weather will likely develop across the western end of the state late Thursday night and Friday and may last through Saturday. A front will drop down from the northwest and stall near Kauai, while surface high pressure passing north of the front ushers in building trade winds. An upper level trough will pass over the islands on Friday and could create enough instability to trigger heavy showers. The GFS and ECMWF had been trending weaker with the upper level trough during the past few runs, but the 12Z ECMWF run showed the feature cutting off into an upper level low on top of the state Friday night and Saturday. Due to continuity, we are placing greater weight in the GFS, which lifts the upper trough out before it cuts off on Saturday. The forecast calls for wetter conditions to favor windward areas of Kauai and Oahu with moderate, mainly windward showers elsewhere. Uncertainty remains somewhat high.

Uncertainty lingers into Sunday, hinging upon the above mentioned upper level low. The GFS shows a building mid level ridge bringing increasingly stable conditions and a drier trade wind flow, and the ECMWF lingers the upper level over the state, leaving open the possibility of unstable conditions. For now, the forecast represents a blend of the models, showing a somewhat wet trade wind pattern.

Heading into next week, expect trades to veer southeasterly again with drier conditions.

AVIATION. A surface ridge of high pressure will continue to hold north of the state this afternoon and generate light easterly flow. Sea breezes are expected to dwindle this evening and be replaced by land breezes overnight.

Scattered low clouds and isolated light showers will be mainly limited to windward areas of Maui and the Big Island.

MARINE. A nearly stationary ridge just north of the area will keep winds light and variable across Kauai and Oahu, and moderate to locally fresh out of the east to southeast over Maui County and the Big Island through most of the week. An approaching front from the NW will shift the ridge over the island chain by Thursday, weakening winds around Maui County and Big Island and generating unsettled weather. Northeast fresh to locally strong trades will fill in behind the front by the end of the week.

A dynamic weather pattern across the Pacific will keep surf elevated along north and west facing shores beginning tonight. The next northwest swell has reached Buoy 51001 which came in at 7 feet 16 seconds and is anticipated to reach Kauai by midnight. Thus, a High Surf Advisory has been issued for north and west facing shores of the smaller islands beginning midnight tonight through Wednesday night. A Small Craft Advisory has also been issued for waters exposed to the swell for seas above 10 feet. Surf will remain elevated near advisory level Thursday. Another slightly larger, northwest to north-northwest, swell is expected to fill in Thursday night and peak Friday at solid advisory levels, then slowly decline through the weekend as swell shifts to a more northerly direction.

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. An increase in surf is possible over the weekend as trades build behind the front.

Surf along south facing shores will remain small through the week. However, background south swells should be enough to keep things from going flat.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory from midnight tonight to 6 AM HST Thursday for north and west facing shores of Niihau, Kauai, Oahu, and Molokai and for north facing shores of Maui.

Small Craft Advisory from midnight tonight to 6 AM HST Thursday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Oahu Windward Waters-Maui County Windward Waters-Big Island Windward Waters.



DISCUSSION . Wroe AVIATION . Thomas MARINE . Almanza/TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 29 mi55 min 77°F 78°F1017.2 hPa (+1.2)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 39 mi61 min 78°F 78°F1017.3 hPa
51205 46 mi55 min 77°F8 ft
ILOH1 - 1617760 - Hilo, HI 72 mi55 min 76°F 79°F1017.7 hPa (+0.6)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI38 mi2 hrsE 1210.00 miPartly Cloudy81°F60°F49%1017.5 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrCalmE6S7S9SW6CalmS6S7S7SE7CalmS4S7SE5CalmN4N4NE14NE14NE135
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1 day agoW5E5E64Calm4S4S5SE3CalmS3S5SW3SE6CalmS53NW7NE14
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2 days ago3S7E5E3SE8CalmSE8CalmSE8SE3SE7SE7SW5S73NW43NE16
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Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
Click for Map
Tue -- 05:52 AM HST     1.98 feet High Tide
Tue -- 07:00 AM HST     Sunrise
Tue -- 09:43 AM HST     Moonrise
Tue -- 01:06 PM HST     0.20 feet Low Tide
Tue -- 06:12 PM HST     Sunset
Tue -- 06:31 PM HST     1.02 feet High Tide
Tue -- 09:43 PM HST     Moonset
Tue -- 11:44 PM HST     0.39 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.91.31.71.921.91.61.20.90.50.30.20.30.40.70.9110.90.70.60.4

Tide / Current Tables for Makena, Maui Island, Hawaii
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Makena
Click for Map
Tue -- 05:46 AM HST     1.78 feet High Tide
Tue -- 07:03 AM HST     Sunrise
Tue -- 09:46 AM HST     Moonrise
Tue -- 12:51 PM HST     0.20 feet Low Tide
Tue -- 06:14 PM HST     Sunset
Tue -- 06:25 PM HST     0.82 feet High Tide
Tue -- 09:45 PM HST     Moonset
Tue -- 11:29 PM HST     0.39 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.21.51.71.81.71.41.10.70.40.20.20.30.40.60.70.80.80.70.60.50.4

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 (23,6,7,8)
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Ground Weather Radar Station Kohala, HI
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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.