Thursday, April22, 2021
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Marine Weather and Tides
Kahului, 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 5:59AMSunset 6:48PM Thursday April 22, 2021 3:13 AM HST (13:13 UTC) Moonrise 2:41PMMoonset 3:03AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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- 932 Pm Hst Wed Apr 21 2021
Rest of tonight..Winds variable less than 10 knots. Wind waves 2 feet or less.
Thursday..Northeast winds 10 knots. Wind waves 2 feet or less.
Thursday night..North winds to 25 knots. Wind waves 2 feet or less then 3 feet after midnight.
Friday..Northeast winds to 25 knots. Wind waves 2 feet or less then 3 feet in the afternoon.
Friday night..Northeast winds to 25 knots. Wind waves 3 feet.
Saturday..Northeast winds to 25 knots. Wind waves 3 feet.
Saturday night..North winds to 25 knots. Wind waves 3 feet.
Sunday..Northeast winds 20 knots. Wind waves 3 feet.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less.
PHZ100 932 Pm Hst Wed Apr 21 2021
Synopsis for hawaiian coastal waters.. A surface trough northwest of kauai will gradually dissipate through Friday. A surface high passing north of the islands Thursday through Friday will boost trades to locally strong speeds over the eastern half of the island chain.


7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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FXHW60 PHFO 220629 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 829 PM HST Wed Apr 21 2021

SYNOPSIS. Moderate to breezy easterly trade winds will return Thursday through the weekend, with clouds and showers favoring windward and mountain locations. Windward shower coverage could increase Friday night 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 just west of Kauai that has disrupted the trade winds over the islands through the first half of the week will begin to retreat westward and away from the area Thursday through Friday. A pattern transition will result locally with easterly trade winds gradually 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 Thursday into Friday. Showers will favor the typical windward and mountain locations - with the best coverage likely through the overnight and early morning periods as bands of moisture move through. Expect this pattern to persist through the weekend, with shower coverage potentially increasing Friday night through Saturday night as weak 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 through this time.

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. The background flow remains light and variable in the vicinity of the western islands early this evening. This is allowing land breezes to begin to set up from Kauai to Oahu and Molokai. Light trade winds appear to be returning near Maui and the Big Island, but land breezes will also likely become established there. The land breezes will cause most of the low cloud cover to decrease overnight. Some low clouds and showers may return to the windward side of the Big Island later tonight. Otherwise, VFR conditions are expected to prevail over most areas through early Thursday morning.

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

AIRMET Sierra for mountain obscuration on Kauai and the Big Island were allowed to expire at 8 PM HST, since conditions improved after sunset this evening. No additional AIRMETS are expected through Thursday morning.

MARINE. A trough northwest of Kauai will gradually dissipate through Friday, allowing light trades to spread westward. A surface high is forecast to pass north of the islands Thursday and Thursday nigh and stall far north-northeast of the islands Friday and the weekend. This 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 through Sunday. The trades are then expected to turn east to southeasterly area-wide Monday through Tuesday, meaning the surf along the east facing shores will subside a little. A Small Craft Advisory for those nearshore waters will be issued later tonight or early Wednesday morning.

The northwest swell has arrived, resulting in a small to moderate bump along the north and west facing shores this afternoon. The swell is slated to peak Thursday 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 swells 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 returning trades turn breezy. Expect surf to build to small to moderate heights, then diminish Monday as the trade winds weaken.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Gibbs AVIATION . Houston MARINE . H Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi61 min NNW 8.9 G 12 73°F 79°F1016.8 hPa
51205 9 mi47 min 76°F6 ft
51213 30 mi47 min 78°F3 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi79 minN 010.00 miFair70°F69°F97%1017.4 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrS6SE6S3S3CalmCalm4NE14NE17NE18NE19NE20NE13
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1 day agoS3SW3S4S4S34N9N9N8N10N10N7N5N7N53S5S4E4NE3SW5W5SE4S3
2 days agoCalmSE6SE6NW6N535S9N9S5N9N7NE9N6NW5NW5NW6SW8W6S5E5S4SE5SE5

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 03:03 AM HST     Moonset
Thu -- 06:01 AM HST     Sunrise
Thu -- 06:34 AM HST     0.44 feet Low Tide
Thu -- 11:47 AM HST     1.16 feet High Tide
Thu -- 02:40 PM HST     Moonrise
Thu -- 05:15 PM HST     0.30 feet Low Tide
Thu -- 06:47 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.121.71.30.90.60.50.50.60.811.11.21.10.90.60.40.30.30.60.91.31.82.1

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Thu -- 12:24 AM HST     1.96 feet High Tide
Thu -- 03:02 AM HST     Moonset
Thu -- 06:01 AM HST     Sunrise
Thu -- 07:09 AM HST     -0.09 feet Low Tide
Thu -- 01:24 PM HST     1.22 feet High Tide
Thu -- 02:41 PM HST     Moonrise
Thu -- 06:18 PM HST     0.18 feet Low Tide
Thu -- 06:47 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.91.71.30.80.40-0.1-00.20.50.81.11.21.210.70.40.20.20.40.71.11.5

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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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