Saturday, July4, 2020
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Marine Weather and Tides
Keokea, 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 7:13 AM HST (17:13 UTC) Moonrise 7:11PMMoonset 5:20AM 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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PHZ119 Maalaea Bay- 314 Am Hst Sat Jul 4 2020
Today..North winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Tonight..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Sunday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Sunday night..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Monday..North winds 20 knots. Wind waves 2 feet or less.
Monday night..North winds 20 knots. Wind waves 2 feet or less.
Tuesday..North winds to 25 knots. Wind waves 3 feet.
Wednesday..North winds to 25 knots. Wind waves 3 feet.
PHZ100 314 Am Hst Sat Jul 4 2020
Synopsis for hawaiian coastal waters.. A surface high pressure system is far north-northeast of the islands, but a weak surface trough in the vicinity of the kauai channel 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 Keokea, HI
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location: 20.67, -156.34     debug


Area Discussion for -
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FXHW60 PHFO 041328 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 328 AM HST Sat Jul 4 2020

SYNOPSIS. Light to moderate east-southeast winds will continue into tonight as a weak trough moves through. A sufficient amount of moisture associated with this trough combined with a weak upper disturbance will continue to support the showery conditions today. 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 through next week.

DISCUSSION. Latest observations and satellite data show a weak trough moving through over the western end of state from east to west early this morning. The low-level flow has responded and shifted out of the east-southeast in its wake from Oahu to the Big Island and out of the east-northeast over Kauai. Trade wind convergence into this trough combined with a weak middle- 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 1.4 to 1.7 inches. The latest rainfall summary showed peak 6-Hr (through 2 AM HST) accumulations ranging from half of an inch to an inch.

Guidance remains in decent agreement and shows this weak surface trough continuing westward today over the western end of the state, then west of the islands Sunday. As a result, the moist and showery conditions will hold through tonight. 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. 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 weak surface trough in the Kauai Channel will continue westward, passing Kauai later this morning. East of this trough is a moist, light to moderate easterly wind flow with a slight south component. Expect this airmass to harass the islands today. Scattered showers have been prevalent all night long area-wide, but more so the entire length of the leeward waters from the Big Island to waters south of Kauai. As the day progresses, expect showers to pick up across the lee and interior areas of the smaller islands. AIRMET Sierra for mountain obscuration is possible for particularly Oahu and Kauai later today.

The area of clouds with embedded showers that was sitting off the Kau and Puna coast of the Big Island earlier in the evening, is having a hard time making landfall along the Kau coast, thanks to a land breeze there. The Puna district, on the otherhand, has seen a few showers moving onshore. Tops of the showers area- wide, are between 10k and 12k feet, with higher tops to 15k feet. Leeward Big Island will see increasing clouds with scattered showers this afternoon, lasting through this evening. A drier, more stable airmass will be spreading across the area from east to west beginning tonight through Sunday.

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 in the vicinity of the Kauai Channel early this morning, 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. Therefore, Small Craft Advisory (SCA) conditions will likely develop across the typically windier waters adjacent to the islands of Maui County and the Big Island starting Tuesday, and continuing through mid-week.

Surf is expected to remain below the High Surf Advisory criteria along all shorelines through early next week. Expect a mix of small background swells from the south-southeast and south- southwest through Tuesday. A new longer period south-southwest swell arriving 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 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
KLIH1 - 1615680 - Kahului Bay, Maui, HI 17 mi55 min N 8 G 12 75°F 80°F1014.6 hPa
51205 24 mi47 min 79°F4 ft
51213 36 mi47 min 80°F3 ft
51202 - Mokapu Point, HI (098) 88 mi47 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI17 mi19 minS 310.00 miPartly Cloudy75°F66°F76%1015.6 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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E10E9NE7E6E6SE4SE6SE4SE5SE5SE6SE3S3
1 day agoN5N14NE19NE20NE21NE22NE19
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NE23----------NE12NE6NE6----N7NE4E5NE6NE6N6
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NE14NE12------------N6NE7NE7NE9E14
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Tide / Current Tables for Makena, Maui Island, Hawaii
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Makena
Click for Map
Sat -- 02:34 AM HST     0.50 feet High Tide
Sat -- 05:20 AM HST     Moonset
Sat -- 05:50 AM HST     Sunrise
Sat -- 08:00 AM HST     -0.24 feet Low Tide
Sat -- 03:39 PM HST     2.36 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:10 PM HST     Sunset
Sat -- 07:11 PM HST     Moonrise
Sat -- 11:06 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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0.30.40.50.50.40.20-0.2-0.2-0.20.10.61.11.622.32.32.21.81.30.90.50.20.1

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Sat -- 03:15 AM HST     0.91 feet High Tide
Sat -- 05:20 AM HST     Moonset
Sat -- 05:49 AM HST     Sunrise
Sat -- 08:28 AM HST     -0.21 feet Low Tide
Sat -- 04:04 PM HST     2.78 feet High Tide
Sat -- 06:44 PM HST     Full Moon
Sat -- 07:11 PM HST     Sunset
Sat -- 07:11 PM HST     Moonrise
Sat -- 11:11 PM HST     0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.60.80.90.90.70.30-0.2-0.20.10.51.11.72.22.62.82.72.31.71.10.70.40.2

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 (13,3,4,5)
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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.