Thursday, September23, 2021
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Marine Weather and Tides
Wainaku, HI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:16PM Thursday September 23, 2021 5:12 PM HST (03:12 UTC) Moonrise 8:18PMMoonset 8:29AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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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PHZ122 Big Island Windward Waters- 323 Pm Hst Thu Sep 23 2021
Tonight..East winds 15 knots. Wind waves 4 feet. North swell 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 15 knots. Wind waves 4 feet. Northwest swell 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 15 knots. Wind waves 5 feet. Northwest swell 5 feet. Scattered showers.
Saturday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 5 feet. Scattered showers.
Sunday..East winds 20 knots. Wind waves 6 feet. Northwest swell 4 feet. Scattered showers.
Sunday night..East winds 15 knots. Wind waves 6 feet. Northwest swell 3 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 4 to 5 feet. North swell 3 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. Northwest swell 3 feet. Scattered showers.
PHZ100 323 Pm Hst Thu Sep 23 2021
Synopsis for hawaiian coastal waters.. A ridge far north of the islands will strengthen slightly over the weekend, as a surface trough passes just south of the area.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 240159 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 359 PM HST Thu Sep 23 2021

SYNOPSIS. A trade wind pattern will bring passing clouds and showers to mainly windward and mountain areas through the weekend and into next week. Increased showers are expected across windward Big Island late Saturday and Sunday.

DISCUSSION. A 1025 mb high positioned far northeast of the state and building high pressure aloft is providing for a stable trade wind pattern across the forecast area. Subsidence inversion at 8 to 9 thousand feet is keeping clouds and showers vertically limited and afternoon rainfall generally light in even the typically wettest windward and mountain areas. A few thin high clouds continue streaming northward across the state but these will be trending towards the west with the upper ridge building in from the east.

Expecting a trade wind weather pattern across the area for the next seven days. Ridging aloft will bring stable weather with passing clouds and showers the general rule. We are monitoring a trough far to the southeast of the state along the intertropical convergence zone near 144 west longitude. This feature is expected to swing northwestward over the next few days and skirt the southern portion of the state. The trough will likely bring the northern edge of the associated deeper tropical moisture plume near the Big Island as early as late Saturday and into early Sunday, bumping up the chances of rain along windward and upslope areas of the Big Island. We would also expect to have a slight boost in the trade wind strength this weekend as the trough passes by to our south.

AVIATION. With nearly stationary high pressure remaining far north of the area, trade winds will persist in the moderate to locally breezy range for the next several days. VFR will prevail over most areas, but lower cloudiness and showers moving along with the trades will bring brief MVFR conditions to mainly windward and mauka sections from time to time.

MARINE. Moderate to locally strong trade winds will remain in place for the foreseeable future, supported by a surface ridge to the N. A front passing far N of the islands has weakened the ridge, and surface pressures over the islands are down 1 to 2 mb over the past 24 hours. A new high building far NW of the area will strengthen the ridge over the next day or two, while a surface trough is expected to pass S of the area over the weekend. This should bring at least a subtle boost in trade wind speeds, to the point that a Small Craft Advisory (SCA) will likely be required for waters around Maui and the Big Island, where terrain accelerates the flow.

Long-period (~19 seconds) forerunners of a new NNW swell are arriving at buoy 51101 NW of Kauai, while shorter-period remnants of a declining NW swell are delivering some small surf to N and W facing shores. The new swell will build overnight and Friday, with peak surf heights expected late Friday into Saturday, remaining below advisory levels along exposed N and W facing shores. This swell will slowly diminish later Saturday, then drop more significantly Sunday. A small N swell is possible around the middle of next week. Surf along S facing shores will remain somewhat elevated the next couple of days before trending down next week. Short-period wind waves will support mostly small and choppy surf along E facing shores.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Brenchley AVIATION . TS MARINE . Birchard


Weather Reporting Stations
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On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi54 min ENE 5.1 G 7 81°F 80°F1013.2 hPa
KWHH1 46 mi54 min W 8 G 9.9 80°F 81°F1012.5 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi19 minNE 610.00 miFair82°F67°F60%1014.4 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrNE4NE3W4SW4S3SW5SW5SW5SW5SW5SW5W5SW6CalmSW5W355NE7NE8NE9NE9NE7NE6
1 day agoSW5SW4SW4E4SW4SW4W6W5SW6SW5SW4SE3CalmS4W5W5NW7NW7N5NE7NE74NE9NE4
2 days agoW4W3W4W5SW5SW5SW5SW5S5W7W7SW3SW5SW4E6N4W3NE7NW5SW7NE8N4W5NW4

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Thu -- 04:27 AM HST     2.28 feet High Tide
Thu -- 06:09 AM HST     Sunrise
Thu -- 08:30 AM HST     Moonset
Thu -- 10:45 AM HST     0.65 feet Low Tide
Thu -- 04:13 PM HST     1.90 feet High Tide
Thu -- 06:15 PM HST     Sunset
Thu -- 08:18 PM HST     Moonrise
Thu -- 10:23 PM HST     0.41 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.21.72.12.32.221.71.30.90.70.70.81.11.51.71.91.81.61.30.90.60.40.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 05:29 AM HST     1.92 feet High Tide
Thu -- 06:12 AM HST     Sunrise
Thu -- 08:33 AM HST     Moonset
Thu -- 11:40 AM HST     0.34 feet Low Tide
Thu -- 05:21 PM HST     1.53 feet High Tide
Thu -- 06:18 PM HST     Sunset
Thu -- 08:21 PM HST     Moonrise
Thu -- 11:26 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.40.91.31.71.91.91.71.30.90.60.40.30.50.81.11.41.51.51.310.60.30.1

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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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