Saturday, June12, 2021
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Marine Weather and Tides
Honaunau-Napoopoo, 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 3:36 AM HST (13:36 UTC) Moonrise 7:37AMMoonset 9:20PM Illumination 6% 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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PHZ123 Big Island Leeward Waters- 325 Am Hst Sat Jun 12 2021
.small craft advisory in effect through late this afternoon...
Today..West of the big island, southwest winds 15 knots veering northwest in the afternoon. NEar south point, east winds to 25 knots. Wind waves 8 feet. Isolated showers in the morning.
Tonight..Southwest winds 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Isolated showers.
Sunday..West of the big island, winds variable less than 10 knots becoming south 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 6 feet. Isolated showers in the morning.
Sunday night..North winds 10 knots west of the big island... East 20 knots near south point. Wind waves 5 feet. Isolated showers.
Monday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 5 feet. Isolated showers in the morning.
Monday night..West of the big island, northwest winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 5 feet. SWell north 3 feet.
Tuesday..West of the big island, winds variable less than 10 knots in the morning becoming southwest 10 knots, then veering northwest in the evening becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 6 feet. SWell north 3 feet.
Wednesday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves 6 to 7 feet. SWell north 3 feet. Isolated 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 Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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FXHW60 PHFO 120655 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 855 PM HST Fri Jun 11 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 and terrain acceleration, 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, and a mid-level ridge over the area will preclude heavy showers through early next week. Longer range 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 just upstream of the islands. This will likely move through the islands overnight, leading to periods of showers over windward areas, likely clearing most islands by mid-morning Saturday. 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. A northwest-to-southeast oriented band of showers embedded in the breezy trade wind flow will bring increasing showers and an elevated probability of MVFR mainly to windward areas late tonight through the predawn hours on Saturday. AIRMET Sierra for mountain obscuration may eventually be needed for some or all of the islands.

AIRMET Tango for lee turbulence remains in effect.

MARINE. Cor. A surface high will be meandering north far north of the islands through early next week, thus maintaining trade winds across the islands. The strength of the trades will continue to ease from the current locally strong to moderate by Saturday night. Moderate trades will hold to about Monday, then rebound to locally strong where it continues through Wednesday. For tonight and Saturday, a Small Craft Advisory (SCA) is in effect for the selected waters of Maui County and waters south of the Big Island.

Surf will be on the small side all quadrants through next week Friday except for a small to moderate north swell slated to arrive Monday, peak Monday night, followed by a gradual decline through Tuesday night. This swell is from a surface low currently off the Pacific Northwest. A series of small pulses from the south and southwest will keep surf from being flat along the south facing shores into next week. The weakening trade winds mean surf along east facing shores will be a foot less, in the small range, through the weekend. The surf along the east facing shores is likely to rebound Monday when the locally stronger trades return.

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
KWHH1 37 mi49 min E 8 G 15 77°F 79°F1018 hPa
ILOH1 - 1617760 - Hilo, HI 40 mi49 min SSW 2.9 G 4.1 70°F 79°F1018.2 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi44 minW 1010.00 miA Few Clouds77°F69°F77%1017.6 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi4.6 hrsE 710.00 miFair49°F25°F39%1018.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrE5E3NE3NE5CalmSW5SW8S10S11SW12SW10SW9SW9SW75S10SE9SE7E6CalmS4SW5SW5W10
1 day agoE5SE4SE6SE5SE5S7S6W8SW9SW9W10W9SW9SW7S8S8SW5SW3S6S6E5NE3E4E5
2 days agoNE3E3SE5E5SE4SW5W7SW11SW10SW12SW10SW10SW9SW7SW7SW6CalmSW3NE44E4E7E5E5

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Sat -- 12:46 AM HST     0.17 feet Low Tide
Sat -- 04:43 AM HST     0.54 feet High Tide
Sat -- 05:44 AM HST     Sunrise
Sat -- 07:37 AM HST     Moonrise
Sat -- 09:54 AM HST     -0.08 feet Low Tide
Sat -- 05:40 PM HST     2.20 feet High Tide
Sat -- 07:02 PM HST     Sunset
Sat -- 09:21 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.30.40.50.50.50.30.1-0-0.100.20.61.11.51.92.22.221.71.30.90.5

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 12:32 AM HST     0.21 feet Low Tide
Sat -- 04:43 AM HST     0.57 feet High Tide
Sat -- 05:44 AM HST     Sunrise
Sat -- 07:36 AM HST     Moonrise
Sat -- 09:48 AM HST     0.00 feet Low Tide
Sat -- 05:33 PM HST     2.26 feet High Tide
Sat -- 07:02 PM HST     Sunset
Sat -- 09:22 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.30.40.50.60.50.30.2000.10.40.71.21.722.22.22.11.71.30.90.5

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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