Saturday, July4, 2020
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Marine Weather and Tides
Ualapu'e, 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 5:48AMSunset 7:12PM Saturday July 4, 2020 12:50 AM HST (10:50 UTC) Moonrise 7:14PMMoonset 5:22AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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PHZ120 Pailolo Channel- 917 Pm Hst Fri Jul 3 2020
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Scattered showers through the night.
Saturday..East winds 10 knots. Wind waves 4 feet. Scattered showers.
Saturday night..East winds 15 knots. Wind waves 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Sunday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Sunday night..East winds 20 knots. Wind waves 4 feet. Isolated showers.
Monday..East winds to 25 knots. Wind waves 4 feet. Isolated showers.
Monday night..East winds 20 knots. Wind waves 4 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 4 to 5 feet. Isolated showers.
Wednesday..East winds to 25 knots. Wind waves 5 feet. Isolated showers.
PHZ100 917 Pm Hst Fri Jul 3 2020
Synopsis for hawaiian coastal waters.. A surface high pressure system is far north-northeast of the islands, but a weak surface trough near maui county is keeping the trade winds in the light to moderate range this weekend. The surface trough will depart the area as surface high pressure builds far north of the state early next week, which will cause the trade winds to gradually strengthen.


7 Day Forecast for Marine Location Near Ualapu'e, HI
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location: 21.05, -156.88     debug


Area Discussion for -
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FXHW60 PHFO 040620 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 820 PM HST Fri Jul 3 2020

SYNOPSIS. Light to moderate east-southeast winds will continue through the holiday as a weak trough moves through. A modest increase in moisture associated with this trough combined with a weak upper disturbance will be enough to support the showery conditions continuing. Although most of the shower coverage will focus over windward and mountain locations, some leeward showers will be possible, especially where afternoon sea breezes develop. A return of breezy trade winds and drier conditions is anticipated Sunday into next week.

DISCUSSION. Latest observations and satellite data show a weak trough moving through the islands from east to west - somewhere in the vicinity of Maui County and Oahu this evening. The low-level flow has responded and shifted out of the east-southeast over the eastern end of the state and out of the east-northeast over the western end. Trade wind convergence into this trough combined with a weak mid- to upper- level trough and a sufficient amount of low-level moisture support the showery conditions in place for portions of the islands (mostly windward areas). Satellite-estimated precipitable water (PW) imagery reflects this and depicts a decent sized area of higher than normal moisture in the area with values ranging from 1.5 to 1.6 inches. The latest rainfall summary showed peak 6-Hr (through 6 PM HST) accumulations ranging from half of an inch to an inch (peak observed was at Lanai City with 1.15 inches).

Guidance remains in decent agreement and shows this weak surface trough continuing westward Saturday over the western end of the state, then west of the islands Sunday. As a result, the moist and showery conditions will hold through the first half of the weekend. Although most of the shower coverage will focus over windward and mountain locations, some leeward showers will remain possible, especially where afternoon sea breezes develop Saturday. Some showers may be briefly heavy in some locations.

A return of breezy trade winds and drier conditions is anticipated Sunday into early next week as high pressure builds north-northeast of the state.

AVIATION. A light to moderate easterly wind flow lies over the main Hawaiian Islands. A weak low level north to south oriented trough, currently in Maui County, will be moving westward, passing Oahu later tonight, and Kauai Saturday morning. Lagging a few miles behind the trough axis is an area of instability, high humidity, and scattered showers. The current tops of the showers, between 8 to 10k feet, will be rising to as high as 15k feet by Saturday afternoon.

Satellite infrared imagery shows broken to overcast coverage over the leeward waters extending from the Kona coast to the Kauai Channel. There is a bit less coverage across the windward waters except for the Big Island east facing shores from Cape Kumukahi to South Point, where there is an area of overcast clouds banked up against the shoreline. This area will be monitored closely for it may flare up in the coming hours as it moves onshore leading to a AIRMET Sierra for mountain obscuration. The Kona coast will also observe a shower or two along the coastline the rest of tonight. Elsewhere, scattered showers will be favoring the windward and mountain areas, causing brief periods of MVFR ceilings and vis.

MARINE. A surface high pressure system is evident far north-northeast of the main Hawaiian Islands. However, a weak surface trough, which appears to be near Maui County early this evening, continues to disrupt the pressure gradient over the islands as it moves slowly westward. This will likely maintain light to moderate trades over the state this weekend. After the surface trough departs the region, the forecast guidance indicates surface high pressure will build far north of the islands early next week. This will cause the the trade winds to gradually strengthen, and Small Craft Advisory (SCA) conditions will likely develop across most of the typically windier waters adjacent to the islands of Maui County and the Big Island starting Monday or Tuesday.

Surf is expected to remain below the High Surf Advisory criteria along all shorelines through early next week. The current small south swell will gradually decline this weekend. Otherwise, expect a mix of small background swells from the south-southeast and south-southwest through next Tuesday. A new longer period south-southwest swell arriving next Wednesday is expected to gradually build through Thursday. This may cause a slight increase in surf along most south facing shores by the middle of next week.

The weak trade wind regime will keep surf small along east facing shores into early next week. As the trade winds strengthen, expect choppy surf to increase along east facing shores from late Tuesday through the end of next week. Surf along most north facing shores will remain nearly flat for the foreseeable future. However, small background easterly trade wind wrap and small northwest swell energy may possibly produce periods of tiny surf along some north facing beaches and reefs.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Gibbs AVIATION . H Lau MARINE . Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 22 mi55 min 80°F4 ft
51205 24 mi85 min 79°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 24 mi51 min NNW 8 G 9.9 77°F 81°F1015.1 hPa (+0.4)
51202 - Mokapu Point, HI (098) 49 mi55 min 80°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaunakakai, Molokai Airport, HI14 mi57 minN 310.00 miOvercast75°F68°F79%1016.1 hPa
Lanai City, Lanai Airport, HI19 mi55 minN 610.00 miMostly Cloudy70°F0°F%1015.5 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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2 days ago------------------------NE11E14E14
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--E15E12

Tide / Current Tables for Kamalo Harbor, Molokai Island, Hawaii
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Kamalo Harbor
Click for Map
Sat -- 02:29 AM HST     0.70 feet High Tide
Sat -- 05:21 AM HST     Moonset
Sat -- 05:50 AM HST     Sunrise
Sat -- 08:16 AM HST     -0.24 feet Low Tide
Sat -- 03:34 PM HST     2.56 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:13 PM HST     Sunset
Sat -- 07:14 PM HST     Moonrise
Sat -- 11:22 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.70.70.60.40.1-0.1-0.2-0.20.10.51.11.72.22.52.52.321.510.60.30.2

Tide / Current Tables for Kaunakakai, Molokai (Hawaii) (2)
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Kaunakakai
Click for Map
Sat -- 03:01 AM HST     0.70 feet High Tide
Sat -- 05:22 AM HST     Moonset
Sat -- 05:51 AM HST     Sunrise
Sat -- 08:24 AM HST     -0.24 feet Low Tide
Sat -- 04:06 PM HST     2.56 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:13 PM HST     Sunset
Sat -- 07:14 PM HST     Moonrise
Sat -- 11:30 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.60.70.60.40.2-0.1-0.2-0.200.40.91.522.42.62.52.11.71.10.70.30.2

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 (6,6,7,8)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.