Saturday, August8, 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 6:01AMSunset 7:00PM Saturday August 8, 2020 1:45 AM HST (11:45 UTC) Moonrise 10:32PMMoonset 10:20AM Illumination 80% Phase: Waning Gibbous; Moon at 19 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- 949 Pm Hst Fri Aug 7 2020
.small craft advisory in effect through Saturday afternoon...
Rest of tonight..East winds to 25 knots. Wind waves 8 feet. Isolated showers.
Saturday..East winds to 30 knots. Wind waves 9 feet. Isolated showers.
Saturday night..East winds to 25 knots. Wind waves 9 feet. Isolated showers.
Sunday..East winds to 25 knots. Wind waves 8 feet. Isolated showers.
Sunday night..East winds to 25 knots. Wind waves 9 feet. Isolated showers.
Monday..East winds to 25 knots. Wind waves 8 feet. Isolated showers.
Monday night..East winds to 25 knots. Wind waves 8 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 6 to 7 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 6 to 7 feet. Isolated showers.
PHZ100 949 Pm Hst Fri Aug 7 2020
Synopsis for hawaiian coastal waters.. High pressure will remain far north-northeast of the islands through the forecast period. Winds will trend up slightly this weekend.


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 080615 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 815 PM HST Fri Aug 7 2020

SYNOPSIS. Breezy trade winds will prevail through the weekend, then trend down Tuesday through midweek as high pressure to the northeast weakens. Clouds and showers will favor windward and mountain areas each day, especially through the overnight and early morning periods as pockets of moisture move through. Windward shower coverage may decrease later in the weekend and into early next week some drier air moves into the area.

DISCUSSION. Latest surface analysis and satellite imagery showed the subtropical ridge anchored north of the islands and patchy low- level clouds approaching and moving through from east to west. Some of these clouds are generating brief/mostly light showers as they move through - especially over the western end of the island chain where a band of higher than average moisture (PWs up to 2 inches) has setup. Rain gages around the islands reflected this and showed peak accumulations up to near an inch on Kauai in the past 12-Hrs (through 7 pm HST). Elsewhere, accumulations ranged from a few hundredths to a quarter of an inch through this period. Expect the showery and breezy pattern to hold into the weekend in response to this area of higher moisture lingering in the area.

Guidance has initialized well with the current pattern and shows upper heights gradually rising through the weekend as the the upper trough that moved over the past couple of days through continues westward and away from the area. This combined with PWs trending back down toward normal will translate to a slightly drier and more stable trade wind pattern returning by or around Sunday. Trades will become brisk through this time as high pressure strengthens to the north, but should trend down through the first half of next week. Another area of lower heights moving in aloft early next week could enhance shower coverage once again through midweek, mostly for windward and mountain locations.

AVIATION. Moderate trades predominantly out of the east have been relatively dry today suggesting AIRMET SIERRA will not be required in the near term. Improved moisture spreading back into the area during the latter half of the period will bring an increased likelihood of periodic showers and MVFR/mountain obscuration for windward areas.

AIRMET TANGO remains in effect over and immediately south thru west of mountains below 9000 feet for tempo moderate turbulence.

MARINE. High pressure to the north-northeast is expected to strengthen this weekend, which will boost trade winds across the coastal waters. The Small Craft Advisory (SCA) for the typical windier areas near Maui County and the Big Island expands to include Maui Windward Waters, the Kaiwi Channel and Oahu Leeward Waters Saturday morning, through Sunday afternoon. Wind are expected to trend down early next week, which should once again bring the SCA level winds to the typical areas near Maui County and the Big Island.

Surf along south facing shores is expected to return to background levels by Saturday, and remain below summer average into next week. Small short period southeast swell will continue, with the Big Island blocking some of that energy from reaching the smaller islands. Surf along east facing shores will build through the weekend as trade winds strengthen, but is expected to remain below the advisory levels. A small north-northwest swell will provide a bit of energy to the north facing shores, keeping surf just above flat through Saturday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

Small Craft Advisory from 6 AM Saturday to 6 PM HST Sunday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters.



DISCUSSION . Gibbs AVIATION . Thomas MARINE . M Ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 29 mi46 min SSW 1.9 G 6 82°F 83°F1015.1 hPa (-0.9)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 39 mi46 min ENE 17 G 23 77°F 81°F1016.9 hPa (-0.8)
51205 46 mi50 min 80°F7 ft
ILOH1 - 1617760 - Hilo, HI 72 mi46 min Calm G 1.9 77°F 80°F1016.6 hPa (-0.7)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI38 mi52 minENE 14 G 2510.00 miFair79°F69°F72%1017.3 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrNE13NE9NE10NE12NE7NE11NE15NE17
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1 day agoCalmNE5NE10NE5NE4NE9NE13NE14
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Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
Click for Map
Sat -- 01:14 AM HST     0.32 feet Low Tide
Sat -- 06:01 AM HST     Sunrise
Sat -- 07:10 AM HST     1.29 feet High Tide
Sat -- 10:19 AM HST     Moonset
Sat -- 12:33 PM HST     0.66 feet Low Tide
Sat -- 06:41 PM HST     1.65 feet High Tide
Sat -- 06:56 PM HST     Sunset
Sat -- 10:31 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.30.40.50.811.21.31.31.10.90.80.70.70.811.21.51.61.61.51.31.10.8

Tide / Current Tables for Makena, Maui Island, Hawaii
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Makena
Click for Map
Sat -- 12:59 AM HST     0.32 feet Low Tide
Sat -- 06:03 AM HST     Sunrise
Sat -- 07:04 AM HST     1.09 feet High Tide
Sat -- 10:21 AM HST     Moonset
Sat -- 12:18 PM HST     0.66 feet Low Tide
Sat -- 06:35 PM HST     1.45 feet High Tide
Sat -- 06:59 PM HST     Sunset
Sat -- 10:33 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.30.40.50.70.911.11.110.80.70.70.70.811.11.31.41.41.31.20.90.7

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 (7,2,3,4)
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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.