Thursday, July29, 2021
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Marine Weather and Tides
Laupahoehoe, 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 5:53AMSunset 6:59PM Wednesday July 28, 2021 10:48 PM HST (08:48 UTC) Moonrise 10:38PMMoonset 10:14AM Illumination 75% Phase: Waning Gibbous; Moon at 20 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- 957 Pm Hst Wed Jul 28 2021
Rest of tonight..East winds 20 knots. Wind waves 5 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..East winds 20 knots. Wind waves 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 20 knots. Wind waves 6 feet. Scattered showers in the morning.
Friday night..East winds 20 knots. Wind waves 6 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 6 feet. Isolated showers in the morning.
Saturday night..East winds 20 knots. Wind waves 6 feet. Isolated showers through the night.
Sunday..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Monday..East winds 20 knots. Wind waves 5 feet. Scattered showers.
PHZ100 957 Pm Hst Wed Jul 28 2021
Synopsis for hawaiian coastal waters.. High pressure far north of the state will continue to produce fresh to locally strong trade winds throughout the forecast period.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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FXHW60 PHFO 290758 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 958 PM HST Wed Jul 28 2021

UPDATE. Tsunami Watch for the State of Hawaii has been cancelled.

SYNOPSIS. Moderate to breezy easterly trade winds will strengthen late Thursday through the weekend. Clouds and showers will favor windward and mauka locations, with the best chances through the overnight and early morning periods. A return of drier trade wind conditions is anticipated Friday through the weekend.

DISCUSSION. The upper trough that led to cloudy conditions over the western end of the state today is lifting northward and away from the area. Plenty of middle- to upper-level dry air following it has cleared some of the high clouds out this evening over Kauai and Oahu. Expect this trend to continue into the second half of the week with stable trade wind conditions returning. There is a large area of moisture moving into the eastern end of the state this evening that will support decent windward and mauka shower coverage overnight through the morning hours Thursday. In its wake, satellite data reflects dry air farther upstream of the Big Island. Guidance has initialized well with this and has the dry air moving through from east to west late Thursday through Friday. This dry air combined with rising upper heights will lead to more of a suppressed and stable environment this weekend, which will limit cloud/shower windward coverage. Similar conditions will carry into next week.

AVIATION. VFR conditions are expected to prevail across the main hawaiian islands overnight. The upper level disturbance that brought in some mid and high clouds and isolated thunderstorms to the waters around Kauai this morning is now history. The remnants of a disturbance that was expected to affect eastern Big Island tonight, will miss the island. So all we have is the widely dispersed low clouds embedded in the moderate to locally strong trade wind flow that is expected to continue through Thursday. So for AIRMET Tango for low level turb is likely to continue despite the lack of evidence on the radar derived winds. Low clouds embedded in this trade wind flow will bring some brief passing MVFR conditions as they impact the windward and mountain areas. A shower or two is possible along the Kona coast as well overnight. Tops of these showers will be around 8k feet. No other AIRMETS are anticipated overnight.

MARINE. A 1025 mb high is centered far north of the state. This places the area in a fresh to locally strong trade wind environment. A Small Craft Advisory (SCA) is currently posted for the typically windy waters around Maui County and the Big Island. The high is forecast to gradually strengthen later in the week and over the weekend with an uptick in trade winds expected. The SCA may need to be expanded in coverage when this occurs.

Surf along east facing shores will remain small through Friday, then trend up over the weekend in response to strengthening trades locally and upstream of the state over the eastern Pacific.

Southerly swell activity will remain rather low for this time of the year with just background swells expected from the south and southeast. There is also a slight chance for a small westerly pulse from tropical cyclone activity in the far west Pacific which could provide for some small surf along exposed shorelines.

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



DISCUSSION . Gibbs AVIATION . H Lau MARINE . Houston


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 83 mi48 min Calm G 1 75°F 80°F1018 hPa (+1.6)

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, HI84 mi55 minN 08.00 miOvercast75°F71°F88%1018.9 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrW4W5W4CalmSW4SW4CalmSE5W6W8W7W3NE8W4N6NE10E9NE9NE9NE8NE5E3E5Calm
1 day agoSW5SW4W4CalmW3SW4SW4CalmCalmW3CalmNE8NE8NW7NE9E7NE7NE9NE10E7NE53CalmW5
2 days agoCalmCalmSW3CalmSW4CalmW3W5SW7W4W4NW6E9NE10NE11NE6NE10E9NE10E10E6E12E11W7

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Thu -- 01:27 AM HST     0.31 feet Low Tide
Thu -- 05:55 AM HST     Sunrise
Thu -- 07:52 AM HST     1.69 feet High Tide
Thu -- 11:07 AM HST     Moonset
Thu -- 12:59 PM HST     0.86 feet Low Tide
Thu -- 06:52 PM HST     1.94 feet High Tide
Thu -- 06:57 PM HST     Sunset
Thu -- 11:14 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.30.30.50.81.21.51.61.71.61.41.10.90.90.91.11.41.71.91.91.81.61.31

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Thu -- 01:15 AM HST     0.42 feet Low Tide
Thu -- 05:55 AM HST     Sunrise
Thu -- 07:16 AM HST     1.56 feet High Tide
Thu -- 11:07 AM HST     Moonset
Thu -- 12:32 PM HST     0.83 feet Low Tide
Thu -- 06:53 PM HST     2.06 feet High Tide
Thu -- 06:57 PM HST     Sunset
Thu -- 11:14 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.40.50.70.91.21.41.61.51.41.210.80.811.21.51.822.121.71.41

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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