Thursday, April22, 2021
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Marine Weather and Tides
Kaumakani, 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 6:05AMSunset 6:55PM Thursday April 22, 2021 5:06 AM HST (15:06 UTC) Moonrise 2:53PMMoonset 3:18AM Illumination 81% 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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PHZ112 Kauai Leeward Waters- 334 Am Hst Thu Apr 22 2021
Today..East winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet. Isolated showers through the day.
Tonight..East winds 15 knots. Wind waves 4 feet. Northwest swell 4 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 5 feet. Northwest swell 4 feet. Isolated showers in the morning.
Friday night..East winds 20 knots. Wind waves 6 feet. North swell 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 20 knots. Wind waves 6 feet. North swell 4 feet. Scattered showers in the morning.
Saturday night..East winds 20 knots. Wind waves 6 feet. North swell 3 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 4 to 5 feet. North swell 3 feet. Isolated showers.
Monday..East winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Isolated showers.
PHZ100 334 Am Hst Thu Apr 22 2021
Synopsis for hawaiian coastal waters.. A surface trough north of kauai will gradually dissipate through tonight. A surface high passing north of the islands today through Friday will boost trades to locally strong speeds over the eastern half of the island chain. The trade will start trending down Monday while trending southeast over the smaller islands.


7 Day Forecast for Marine Location Near Kaumakani, HI
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location: 21.91, -159.63     debug


Area Discussion for -
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FXHW60 PHFO 221331 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 331 AM HST Thu Apr 22 2021

SYNOPSIS. Moderate to breezy easterly trade winds will return today and persist through the weekend, with clouds and showers favoring windward and mountain locations. Windward shower coverage could increase late Friday through Saturday night as an upper disturbance moves through from north to south. Warm and humid conditions may return early next week as the trade winds diminish in response to a cold front passing far to the north.

DISCUSSION. The surface trough analyzed near Kauai that disrupted the trade winds through the first half of the week will begin to retreat westward and away from the area through Friday. A pattern transition will result locally with easterly trade winds returning from east to west as high pressure builds to the north. This combined with rising upper heights and plenty of mid-level dry air will translate to more of a stable trade wind regime through tonight. Showers will favor the typical windward and mountain locations - with the best coverage likely through the overnight and early morning periods.

Windward shower coverage may increase late Friday through Saturday night as an upper low drops southward into the area. Some showers could spill over into leeward locations as the inversion lifts/weakens and the trades become breezy. In addition to the increasing shower coverage, a thunderstorm or two can't be ruled out over the Big Island slopes through the afternoon hours Friday and Saturday.

Guidance remains in decent agreement early next week and shows the previously discussed upper low briefly drifting south of the state Sunday through Sunday night, then lifting back through the area and phasing with a shortwave trough passing far to the north Monday through Tuesday. Subtropical ridge will weaken once again as the attendant cold front passes to the north. If this scenario evolves, a land and sea breeze regime with warm and humid conditions will return and continue through the first half of next week. Clouds and showers will shift back over interior and leeward locations through the afternoon hours.

AVIATION. Light trade winds appear to be returning near Maui and the Big Island early this morning. The background flow remains light and variable in the vicinity of the smaller islands west of Maui. Local land breezes are dominating the low-level flow over most of the individual islands. The land breezes have kept low clouds to a minimum over most areas. However, scattered to broken low clouds and isolated showers are moving into the windward side of the Big Island. This may cause brief MVFR conditions along the Big Island windward slopes this morning. Otherwise, VFR conditions are expected to prevail over most areas this morning.

Light to moderate trade winds are forecast to return across the entire state later today. The low-level trade wind flow may bring some low clouds and brief showers to the windward sections on some of the islands later today and tonight.

No AIRMETS are currently in effect, and none are anticipated through this afternoon.

MARINE. A surface high passing north of the islands today through Friday then stalling north-northeast over the weekend will result in a boost in the trade winds with speeds reaching locally strong for waters around Maui County and south of the Big Island between today and Sunday. The trades are then expected to trend down while becoming southeast Monday, then hold through Wednesday as the high weakens.

The arrival of the northwest has resulted in a small to moderate bump along the north and west facing shores. This swell is slated to peak today followed by slow decline through Friday. Expect a small to moderate, long- period west- northwest swell to arrive next Monday night and peak Tuesday, followed by a slow decline. A small short period west- northwest to northwest pulse is expected reach our north and west facing shores next week Wednesday night.

A continuous stream of small, but long-period swell from the south and southwest will maintain small surf along south facing shores through next week Wednesday. Surf along the east facing shores will be on the rise Friday and Saturday when the trades turn breezy. Expect surf to build to small to moderate heights, then start diminishing Monday as the trade winds weaken.

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



DISCUSSION . Gibbs AVIATION . Houston MARINE . H Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 15 mi73 min W 4.1 G 4.1 68°F 81°F
51201 - Waimea Bay, HI (106) 82 mi70 min 77°F5 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kekaha, Pacific Missile Test Facility Barking Sands, HI14 mi76 minE 510.00 miFair69°F64°F84%1016.4 hPa
Lihue, Lihue Airport, HI16 mi74 minWNW 510.00 miPartly Cloudy69°F67°F93%1016.7 hPa

Link to 5 minute data for PHBK

Wind History from HBK (wind in knots)
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Last 24hrE4NE4N7N7N10N11N11N13N11N11N12N11N8N5SE5S5E4E6E4SE3E4E5E5E5
1 day agoSE7SE8S7SE8SE7S10S8S8S8SE8SE8E6E6SE5SE5SE4E3CalmE3NE4E4E3E4E4
2 days agoE4SE4E9E12SE12
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Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
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Thu -- 03:17 AM HST     Moonset
Thu -- 06:12 AM HST     Sunrise
Thu -- 07:09 AM HST     -0.08 feet Low Tide
Thu -- 12:49 PM HST     0.78 feet High Tide
Thu -- 02:52 PM HST     Moonrise
Thu -- 06:18 PM HST     0.15 feet Low Tide
Thu -- 07:01 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.31.10.80.50.20-0.1-00.10.40.60.70.80.70.60.40.20.20.20.30.60.91.2

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Thu -- 03:16 AM HST     Moonset
Thu -- 06:11 AM HST     Sunrise
Thu -- 07:06 AM HST     -0.09 feet Low Tide
Thu -- 12:58 PM HST     0.82 feet High Tide
Thu -- 02:51 PM HST     Moonrise
Thu -- 06:15 PM HST     0.18 feet Low Tide
Thu -- 07:00 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.51.30.90.60.20-0.1-00.10.40.60.80.80.80.60.40.30.20.20.40.711.3

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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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