Monday, April19, 2021
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Marine Weather and Tides
Poipu, HI

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:08AMSunset 6:54PM Monday April 19, 2021 11:34 AM HST (21:34 UTC) Moonrise 11:57AMMoonset 12:58AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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- 930 Am Hst Mon Apr 19 2021
Rest of today..Southeast winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. North swell 3 feet. Isolated showers through the day.
Tonight..East winds 10 knots. Wind waves 2 feet or less. North swell 3 feet in the evening. Scattered heavy showers through the night. Slight chance of Thunderstorms after midnight.
Tuesday..East winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. Scattered heavy showers and slight chance of Thunderstorms.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Wednesday..Northeast winds 10 knots. Wind waves 2 feet or less then 3 feet in the afternoon. Northwest swell 3 feet in the afternoon. Isolated showers.
Wednesday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 4 feet. Isolated showers.
Thursday..East winds 15 knots. Wind waves 4 feet. Northwest swell 4 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 5 feet. North swell 3 to 4 feet. Isolated showers.
PHZ100 930 Am Hst Mon Apr 19 2021
Synopsis for hawaiian coastal waters.. A ridge north of the islands will remain weak through the first half of the week as a front and upper trough approach from the northwest. The ridge will then strengthen toward the end of the work 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 192000 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1000 AM HST Mon Apr 19 2021

SYNOPSIS. Light and variable winds will prevail the next couple of days, with trade winds gradually strengthening Wednesday and Thursday before becoming breezy next weekend. The light winds will allow low clouds and showers to focus over interior locations during the day, with limited showers at night. Shower activity will remain limited today, but an increase in showers expected tonight and Tuesday over Kauai and Oahu as an upper-level disturbance moves through. The upper- level disturbance will bring a thickening layer of mid and high clouds on Tuesday that will gradually diminish on Wednesday. The returning trade winds will bring just a few windward showers.

DISCUSSION. A surface ridge extending SW from a high centered about 1650 miles to the NE is just N of the islands this morning, and is expected to move over the islands on Tuesday as a weak front approaches from the NW. The low-level flow has already veered to the SE and S over the islands, and a few showers moved ashore along S facing shores of Kauai and Oahu early this morning, but they have since cleared. Abundant sunshine is noted nearly statewide, except for scattered to broken low clouds over the Big Island's Puna and South Hilo districts.

The expectation is that afternoon sea breezes will drive cloud formation over the islands today, sparking a few showers over the interior portions of the islands, with these showers tending to drift NW to N. While the light winds will likely allow land breezes to clear showers from the islands overnight tonight, a sharp upper- level trough is expected to pass over the islands on Tuesday, with latest GFS guidance indicating it will bring a period of strong upper-level divergence. This is expected to bring a relatively thick swath of mid- and high-level clouds Tuesday. With the trough moving E of the islands on Wednesday, these layered clouds will diminish.

As the front stalls and dissipates NW of Kauai Tuesday and Tuesday night, the trough aloft will bring instability, with the two combining to bring the threat of heavy showers, and possibly a thunderstorm, with the potential greatest over Kauai. Some heavy showers may also affect Oahu (and maybe Big Island leeward slopes) on Tuesday, especially with afternoon sea breeze convergence. A limiting factor will be the high clouds, which will limit daytime heating, and could limit the vigor of the sea breeze convection.

As the trough aloft moves E of the islands on Wednesday, a weak surface trough (marking the remnants of the front) will linger N of the islands, keeping the trade wind speeds on the lighter side. This trough will dissipate by week's end, and high pressure to the N will supply a strengthening trade wind flow that will become breezy by the weekend. The returning trade winds will be on the drier side as a mid-level ridge brings stability, although there may be a weak low aloft bringing more trade showers over the weekend.

AVIATION. Expect widespread sea breezes over leeward locations today as a front approaching from the NW turns the general flow from the SE. Those daytime sea breezes will turn downslope overnight. The SE slow will bring isolated shower coverage with an increase over interior areas in the afternoon. An increase in clouds and showers is expected overnight from the NW as the front nears.

MARINE. A front approaching from the northwest has been shifting winds over the coastal waters toward the east and southeast in the light to moderate range, with winds becoming more southerly toward the western end of the island chain. Also, a few heavy showers and even a thunderstorm or two will be possible tonight through Tuesday night over Kauai and Oahu waters as the front nears the state. A return of moderate to breezy easterly trades is likely for all waters through the second half of the week.

Surf along north facing shores will hold steady due to a persistent short-to-medium period mix of north-northwest to north-northeast energy moving through. As this energy eases into Tuesday, a medium- period, moderate northwest swell should arrive and begin to build down the island chain Tuesday night through Wednesday. This will be a long-lived event that should hold into the weekend as it shifts out of a more north-northwest direction.

Surf along south facing shores will remain elevated, then trend down Tuesday through midweek as the south-southwest swell eases. A similar south-southwest swell will be possible later this week. And surf along east facing shores will remain small through the week.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Birchard AVIATION . Morrison MARINE . Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi47 min E 2.9 G 4.1 76°F 81°F
51201 - Waimea Bay, HI (106) 73 mi38 min 76°F4 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi42 minESE 610.00 miFair78°F68°F71%1019.1 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi44 minSE 11 G 1710.00 miFair82°F61°F49%1018.4 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE10NE11NE12NE12NE12NE11NE10NE10NE8NE9E9E9E8E10E8W5W6SW4W5W4W4SE5E4E6
1 day agoN12NE13N12NE11NE12N10N10N9NE10N8NE7N6NW5W5NW5NW5NW5NW6N4NE7NE8NE12NE11E11
2 days agoNE11NE8N12N8W3N8N6N6NW5NW6NW4NW4N8NW6NW5NW5NW7N7N12N9N7N9N12N10

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Mon -- 12:59 AM HST     Moonset
Mon -- 05:46 AM HST     0.15 feet Low Tide
Mon -- 06:15 AM HST     Sunrise
Mon -- 10:09 AM HST     0.31 feet High Tide
Mon -- 11:57 AM HST     Moonrise
Mon -- 01:53 PM HST     0.23 feet Low Tide
Mon -- 07:00 PM HST     Sunset
Mon -- 09:00 PM HST     First Quarter
Mon -- 10:03 PM HST     1.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.60.40.20.20.20.20.20.30.30.30.30.20.20.30.40.50.711.21.31.41.3

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Mon -- 12:58 AM HST     Moonset
Mon -- 05:44 AM HST     0.18 feet Low Tide
Mon -- 06:14 AM HST     Sunrise
Mon -- 10:18 AM HST     0.26 feet High Tide
Mon -- 11:56 AM HST     Moonrise
Mon -- 01:50 PM HST     0.28 feet Low Tide
Mon -- 06:59 PM HST     Sunset
Mon -- 09:00 PM HST     First Quarter
Mon -- 10:12 PM HST     1.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.90.60.40.30.20.20.20.20.20.30.30.30.30.30.30.40.60.811.31.41.51.5

Weather Map
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GEOS Local Image of Hawaii    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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