Sunday, September20, 2020
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Marine Weather and Tides
Poipu, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:19AMSunset 6:31PM Sunday September 20, 2020 12:33 AM HST (10:33 UTC) Moonrise 9:57AMMoonset 9:33PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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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PHZ113 Kauai Channel- 917 Pm Hst Sat Sep 19 2020
Rest of tonight..Northeast winds 20 knots. Wind waves 5 feet. Mixed swell south 3 feet and north 3 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 5 feet. Mixed swell southwest 3 feet and north 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..East winds 15 knots. Wind waves 5 feet. Southwest swell 3 feet in the evening. SWell north 3 feet. Isolated showers through the night.
Monday..Northeast winds 20 knots. Wind waves 4 feet. SWell north 3 feet. Isolated showers in the morning.
Monday night..East winds 20 knots. Wind waves 4 feet. Isolated showers after midnight.
Tuesday..Northeast winds 20 knots. Wind waves 4 feet. Isolated showers in the morning.
Tuesday night..East winds 15 knots. Wind waves 4 feet. SWell north 3 feet. Isolated showers after midnight.
Wednesday..East winds 20 knots. Wind waves 4 to 5 feet. SWell north 3 to 5 feet. Isolated showers.
Thursday..Northeast winds 20 knots. Wind waves 4 to 5 feet. SWell north 5 to 6 feet. Isolated showers.
PHZ100 917 Pm Hst Sat Sep 19 2020
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will keep generally moderate to fresh trades in place through late next week. Locally strong winds are expected over the typically windy waters around maui and the big island through the weekend.


7 Day Forecast for Marine Location Near Poipu, HI
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location: 21.88, -159.46     debug


Area Discussion for -
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FXHW60 PHFO 200640 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 840 PM HST Sat Sep 19 2020

SYNOPSIS. A modest increase in moisture moving into the islands from the east will support better windward shower coverage into Sunday, with some light showers potentially reaching our parched leeward areas of the smaller islands. The best chance for this enhanced activity will be through the overnight and early morning hours. A return of drier air is anticipated Sunday night through the first half of the week, which will limit windward shower coverage. Moderate to locally breezy trade winds will relax slightly by midweek as high pressure weakens to the north.

DISCUSSION. Latest surface analysis and satellite imagery showed the subtropical ridge anchored north of the islands and a band of low- level clouds moving into the area. Satellite-derived precipitable water (PW) imagery and the Kauai upper-air sounding reflected this band of shallow moisture in the area with values ranging from 1.5 to 1.75 inches. After a very dry period over the past several days, this increase in moisture will support better trade wind shower coverage overnight into Sunday, especially for the western end of the state. A few of these showers, mostly light, may spill over into leeward areas periodically through this time. Accumulations, however, should remain on the light side. The latest rainfall summary across the state showed peak 24-hr totals just above three quarters of an inch from a few gauges on Kauai. Elsewhere, accumulations have remained under a quarter of an inch through this time.

Guidance has initialized well with the current pattern and shows this band of higher moisture remaining in the area as late as Sunday night. Although accumulations will remain light due to the stable conditions in place, better trade wind shower coverage is expected through Sunday, especially for the western end of the state. A return of dry and stable conditions are expected Monday through midweek as this area of moisture shifts west of the area. Locally breezy trade winds are expected to ease slightly Monday through midweek as high pressure weakens to the north.

AVIATION. A high pressure ridge north of the islands will keep moderate to locally breezy trade winds in the forecast for one more day. A band of unstable clouds will drift through the islands tonight through tomorrow morning bringing periods of scattered showers mainly to windward and mountain areas. The stronger showers will produce passing MVFR conditions through the early morning hours. Tempo Mountain Obscurations may be expanded to other islands as these unstable shower bands roll in.

AIRMET for Tempo Mountain Obscuration in effect for the north and east sections of Kauai. This AIRMET may be expanded to other islands later this morning.

MARINE. A ridge of high pressure north of the state will keep a general moderate to fresh trade wind flow in place through late next week, with only minor fluctuations in strength. Locally strong winds are expected in the typically windy areas around Maui and the Big Island through Sunday night, and as a result, a Small Craft Advisory (SCA) remains in effect for these areas.

A series of long-period south-southwest swells will keep south shore surf pumping through late next week, with surf expected to remain above the summertime average during this time. The current northwest swell will keep some small surf moving into north and west facing shores through the weekend, before declining early next week. A moderate size long-period north-northwest swell, the most significant of the early fall season, is expected to build Tuesday night and Wednesday, bringing a noticeable increase in surf to north facing shores. This swell will peak Wednesday night and Thursday, with a gradual decline through late next week. East shore surf will remain below the summertime average through the next week.

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



DISCUSSION . Gibbs AVIATION . Bohlin MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi46 min NNW 4.1 G 8 76°F 86°F1018.5 hPa

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi41 minNE 168.00 miLight Rain77°F73°F88%1018.1 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi38 minENE 310.00 miPartly Cloudy77°F69°F77%1017.7 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE14NE11E10NE11E12E10E9NE10NE10NE11NE11NE10NE11NE13NE13NE11NE13NE14NE7NE13NE15NE12NE11NE16
1 day agoE10E11E11E12E14E11E12E14E12E14E10E9E11E9NE10E11NE10NE10------NE11NE12NE11
2 days agoE9NE7NE8NE11NE8NE10NE11NE10E10NE10E11NE10NE10NE11NE11NE12NE11NE13NE13NE12NE13E13E14E12

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Sun -- 05:53 AM HST     1.72 feet High Tide
Sun -- 06:26 AM HST     Sunrise
Sun -- 09:57 AM HST     Moonrise
Sun -- 12:34 PM HST     0.44 feet Low Tide
Sun -- 05:37 PM HST     1.12 feet High Tide
Sun -- 06:35 PM HST     Sunset
Sun -- 09:32 PM HST     Moonset
Sun -- 11:56 PM HST     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.30.711.41.61.71.61.41.10.80.60.50.50.60.811.11.110.80.60.40.2

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Sun -- 06:02 AM HST     1.92 feet High Tide
Sun -- 06:25 AM HST     Sunrise
Sun -- 09:56 AM HST     Moonrise
Sun -- 12:31 PM HST     0.52 feet Low Tide
Sun -- 05:46 PM HST     1.22 feet High Tide
Sun -- 06:34 PM HST     Sunset
Sun -- 09:31 PM HST     Moonset
Sun -- 11:53 PM HST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.40.71.11.51.81.91.81.61.310.70.50.50.70.811.21.21.10.90.70.40.2

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
Ground Weather Radar Station Kauai, 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.