Friday, April3, 2020
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Marine Weather and Tides
Poipu, 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 6:21AMSunset 6:49PM Friday April 3, 2020 12:46 PM HST (22:46 UTC) Moonrise 2:40PMMoonset 3:20AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 954 Am Hst Fri Apr 3 2020
Rest of today..South winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers late in the morning, then scattered showers in the afternoon.
Tonight..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet after midnight. Scattered showers.
Saturday..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 4 feet. Scattered showers.
Saturday night..Southeast winds 10 knots. Wind waves 4 feet. Northwest swell 6 feet. Scattered showers and slight chance of Thunderstorms.
Sunday..South winds 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered heavy showers and slight chance of Thunderstorms.
Sunday night..South winds 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered heavy showers and slight chance of Thunderstorms.
Monday..West winds 10 knots. Wind waves 3 feet. Northwest swell 4 to 5 feet. Scattered heavy showers and slight chance of Thunderstorms.
Tuesday..Northwest winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 to 4 feet. Northwest swell 5 to 7 feet. Scattered heavy showers and slight chance of Thunderstorms.
PHZ100 954 Am Hst Fri Apr 3 2020
Synopsis for hawaiian coastal waters.. A front will gradually move towards the area from the northwest, resulting in a light southeast to south wind pattern over the islands. A broad area of south to southeasterly convergent flow will set up over the state starting this weekend. This will likely bring unsettled weather from late Saturday into early next week.


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 032158 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 1158 AM HST Fri Apr 3 2020

SYNOPSIS. An area of low pressure northwest of the state and a ridge of high pressure to the east will keep a light wind regime in place across the islands through next week. Showers will favor the interior of the islands during the afternoon and evening hours. Some deeper moisture will get drawn northward Sunday through early next week, bringing the potential for some locally heavy downpours and a few thunderstorms, mainly during the afternoon and evening hours.

DISCUSSION. Currently, the state of Hawaii sits between an area of low pressure located northwest of the state and high pressure located northeast of the state. This has led to a light wind regime for most areas and will lead to onshore sea breezes this afternoon and overnight land breezes. Interior showers will develop once again this afternoon and could cause a brief period of some moderate rainfall. Due to some instability aloft, there is a chance of some heavier showers and possibly an isolated thunderstorm over the Big Island slopes, but they should be decreasing during the evening hours.

For tonight and Saturday, the low pressure northwest of the state will gradually inch closer and will bring increasing showers over Kauai. At this time, the showers look to be more light to moderate in intensity through Saturday morning, with some brief heavy showers in the afternoon. Over rest of the state, a similar weather pattern to today is expected for Saturday, with afternoon showers over interior areas.

There is still quite a bit of uncertainty for what the weather will be like on Sunday, but the overall pattern would be for increasing showers as the low pressure to our northwest approaches. But for the most part, the shower activity will be during the afternoon.

Starting Sunday night and through Monday, guidance is in fairly good agreement with a short-wave trough swinging through the the state. The convergence area of this trough looks to set up over the western half of the state. The added instability from the short-wave will likely lead to heavier showers and possibly a few thunderstorms over the area. Over the eastern half of the state, a land breeze/sea breeze weather pattern will likely persist through Monday morning. But the combination of the sea breeze and the short wave trough will lead to afternoon shower development. Although the greatest rainfall will likely be over Kauai and Oahu, periods of heavy rainfall will be possible for the Big Island and Maui County Monday afternoon into Monday night.


AVIATION. Low pressure approaching from the NW has turned low level winds from the S to SE directions. Expect afternoon sea breezes and nighttime downslope flow over many terminals. Expect cloud buildups this afternoon with some embedded showers and brief MVFR conditions. Partial clearing is expected overnight. Moderate turbulence AIRMET from FL250 to FL410 is in place due to a W to E subtropical jet over the islands.

MARINE. The current light wind regime is expected to continue well into next week. The the overall background flow will generally be from the southeast to south as a front slowly approaches the area from the northwest. The strongest winds will be through across the windward and and southern Big Island waters.

A broad area of convergent southeast to south flow is expected to set up through the state. This will result in a period of unsettled weather with locally heavy rainfall and possibly thunderstorms from late Saturday into early next week.

A new north-northwest swell building Saturday will produce moderate surf along most north and west shores over the weekend. Surf is expected to remain below the High Surf Advisory (HSA) criteria. A reinforcing west-northwest swell will build Sunday night and Monday, followed by another northwest swell late Tuesday. This series of swells should keep moderate surf along the north and west facing shores into the middle of next week.

The current southeast swell will continue to subside over the next few days. Long period background swells from the south should keep small surf along the south facing shores into next week.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Kino AVIATION . Morrison MARINE . EATON


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi47 min SSE 5.1 G 8 78°F 79°F1014.9 hPa
51208 29 mi17 min 77°F4 ft
51201 - Waimea Bay, HI (106) 73 mi17 min 77°F3 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi54 minS 910.00 miPartly Cloudy79°F69°F72%1014.5 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi51 minSSE 1010.00 miFair80°F68°F67%1014.1 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrSE10----SE10SE10S8S5SE7SE7SE5SE8W7W5W6CalmW3S3CalmS7S9S11S10S9S9
1 day agoNE17N9N16N15N12N13N11NE9NE11E16E14E14E13E12E12E11SE8SE6W4W3E54E7SE8
2 days agoNE9NE11NE12NE13E13NE10NE9NE10NE11NE11NE11NE11NE10NE11NE8N4N4NW5NW4N11NE12N15N14NE16

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Fri -- 03:19 AM HST     Moonset
Fri -- 06:28 AM HST     Sunrise
Fri -- 07:30 AM HST     -0.01 feet Low Tide
Fri -- 12:40 PM HST     0.64 feet High Tide
Fri -- 02:40 PM HST     Moonrise
Fri -- 06:02 PM HST     0.06 feet Low Tide
Fri -- 06:54 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.51.310.70.40.1000.10.30.50.60.60.60.40.30.10.10.10.30.611.3

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Fri -- 12:08 AM HST     1.75 feet High Tide
Fri -- 03:18 AM HST     Moonset
Fri -- 06:27 AM HST     Sunrise
Fri -- 07:27 AM HST     -0.01 feet Low Tide
Fri -- 12:49 PM HST     0.65 feet High Tide
Fri -- 02:39 PM HST     Moonrise
Fri -- 05:59 PM HST     0.07 feet Low Tide
Fri -- 06:53 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.71.51.10.80.40.1000.10.30.50.60.60.60.40.30.10.10.10.40.71.11.5

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 (18,4,5,8)
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Ground Weather Radar Station Kauai, 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.