Saturday, June12, 2021
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Marine Weather and Tides
Leilani Estates, 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 5:39AMSunset 7:00PM Saturday June 12, 2021 4:52 AM HST (14:52 UTC) Moonrise 7:33AMMoonset 9:17PM Illumination 7% Phase: Waxing Crescent; Moon at 2 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- 325 Am Hst Sat Jun 12 2021
Today..East winds 15 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..East winds 15 knots. Wind waves 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 15 knots. Wind waves 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..East winds 15 knots. Wind waves 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Monday..East winds 15 knots. Wind waves 4 feet. SWell north 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..East winds 15 knots. Wind waves 4 feet. SWell north 4 feet. Isolated showers after midnight.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. SWell north 3 to 4 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 4 feet. SWell north 3 feet. Scattered showers.
PHZ100 325 Am Hst Sat Jun 12 2021
Synopsis for hawaiian coastal waters.. A surface high pressure system will remain north of the islands through early next week. The high will weaken today resulting in slightly weaker trade winds that will last through the weekend.


7 Day Forecast for Marine Location Near Leilani Estates, HI
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location: 19.4, -154.93     debug


Area Discussion for -
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FXHW60 PHFO 121335 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 335 AM HST Sat Jun 12 2021

SYNOPSIS. High pressure north of the islands will keep moderate to occasionally breezy trade winds blowing into next week. Low clouds and showers will focus over windward areas, with showers most active during nights and mornings, when they will be more likely to spread leeward on the smaller islands. Daytime heating will produce clouds and a few showers over the leeward slopes of the Big Island during the afternoons and evenings.

DISCUSSION. Moderate to locally breezy trade winds are likely to persist through the weekend and into next week, initially supported by a high pressure cell centered far NNW of the islands. Although the E flank of the high will be impacted by a front and complex low in the NE Pacific this weekend, the associated low-level pressure gradient over the islands looks to remain tight enough to keep moderate trade winds in place. With daytime heating abetting vertical mixing, afternoons will still feature some locally breezy conditions. On the flip side, sheltered leeward areas will likely see fairly light overnight winds. As the NE Pacific low dissipates late this weekend, the high will move E and settle into a more typical position far NE of the islands during the early to middle part of next week, maintaining moderate trade winds.

With trade winds blowing, showery low cloud clusters will focus over windward portions of the islands, occasionally spreading into communities immediately leeward of the mountains. Showers will be most active during the nights and mornings, but a mid-level ridge over the area will preclude heavy showers through early next week. Guidance depicts a slow-moving destabilizing mid-level low developing near the islands by Tuesday, which could lead to an increase in shower coverage and intensity, especially as moisture associated with the aforementioned front nears Kauai and Oahu.

In the meantime, latest satellite images show a loosely organized NW-SE oriented band of showery and stable low clouds over and just upstream of the islands. This will likely clear most islands by mid-morning, with shower coverage diminishing in the afternoon. Model guidance indicates little in the way of organized moisture sources until the front arrives from the N early next week, and subsidence ahead of this feature may lead to reduced shower coverage on Monday before arriving on Kauai, and potentially Oahu, on Tuesday.

AVIATION. Breezy trades will continue to focus clouds, showers, and occasional MVFR conditions over the windward coasts and slopes of all the islands for the next several hours. Aviation conditions will improve during mid to late morning as the resident band of moisture shifts west of the area. Prevailing VFR can then be expected at all locations for the remainder of the day.

AIRMET Sierra for mountain obscuration remains in effect for all windward sections.

AIRMET Tango for lee turbulence remains in effect.

MARINE. A surface high is forecast to stay far north and northeast of the islands into the first half of next week, resulting in continuing trade winds through this stretch. The high is in the process of weakening that will cause a slight drop in the strength of the trades from locally strong to moderate by tonight. It will hold at moderate strength to about Monday night before bumping up a notch Tuesday into Wednesday. A Small Craft Advisory is in effect today for the selected waters of Maui County and waters south of the Big Island. Small Craft Advisory level winds will return by Tuesday.

A north to northeast pulse is slated to arrive Monday, bumping the surf along north facing shores and some east facing shores with a northern exposure into the small to moderate range. The weaker trade winds slightly lower surf in the small range for the east facing shores over the weekend and into early next week. Surf may increase a foot or so around the middle of next week when the trade winds are expected to return to locally strong. A series of small but long period south and southwest swells will maintain small surf along the south facing shores into next week.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM Saturday for Maalaea Bay, the Pailolo and Alenuihaha Channels and waters south of the Big Island.



DISCUSSION . Birchard AVIATION . JVC MARINE . Lau


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 24 mi52 min SSW 2.9 G 5.1 70°F 79°F1018 hPa (-1.1)

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, HI23 mi59 minSSW 610.00 miLight Rain69°F66°F90%1019.1 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW6SW6SW3E3NE7NE8NE5NE9E7--NE8NE8N6NE5E3SE3SW5SW6SW5E7SW6SW5SW6SW6
1 day agoCalmW3CalmNW7CalmNE5NE9E8E3E10E9NE9NE7E6E6E4CalmCalmSW5SW5SW4SW5SW5SW7
2 days agoW7E13N5W8SE83E9NE7E10SE11E11N6NW4NW3E14
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Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Sat -- 03:55 AM HST     0.94 feet High Tide
Sat -- 05:40 AM HST     Sunrise
Sat -- 07:32 AM HST     Moonrise
Sat -- 09:07 AM HST     0.02 feet Low Tide
Sat -- 04:52 PM HST     2.60 feet High Tide
Sat -- 06:59 PM HST     Sunset
Sat -- 09:18 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.60.90.90.90.70.40.100.10.30.71.21.82.22.52.62.52.11.71.20.80.5

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Sat -- 03:28 AM HST     1.12 feet High Tide
Sat -- 05:40 AM HST     Sunrise
Sat -- 07:32 AM HST     Moonrise
Sat -- 09:36 AM HST     -0.28 feet Low Tide
Sat -- 05:09 PM HST     2.68 feet High Tide
Sat -- 06:59 PM HST     Sunset
Sat -- 09:18 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.811.11.10.90.70.3-0-0.2-0.3-0.10.40.91.62.12.52.72.62.31.91.410.8

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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