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 5:54AMSunset 6:59PM Thursday July 29, 2021 4:05 PM HST (02:05 UTC) Moonrise 11:12PMMoonset 11:05AM Illumination 68% 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- 341 Pm Hst Thu Jul 29 2021
Tonight..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 5 feet. SWell southeast 3 feet. Scattered showers in the morning.
Friday night..East winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers in the morning.
Saturday night..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers through the night.
Sunday..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers in the morning.
Sunday night..East winds 20 knots. Wind waves 6 feet. Isolated showers after midnight.
Monday..East winds 20 knots. Wind waves 6 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 5 feet. SWell southeast 3 feet. Scattered showers.
PHZ100 341 Pm Hst Thu Jul 29 2021
Synopsis for hawaiian coastal waters.. High pressure far north of the state will continue to produce fresh to strong trades with a slight increase expected over the weekend.


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 300128 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 328 PM HST Thu Jul 29 2021

SYNOPSIS.

Breezy trades will focus clouds and showers over windward and mauka areas through the forecast period. A drying trend featuring limited shower coverage and intensity is forecast this weekend into next week.

DISCUSSION.

Precipitable water values generally range from around 1.6 to 1.9 inches across the state, solidly above normal values for the date which check in just shy of 1.40". The shallow trade inversion has nonetheless rendered the bulk of this moisture, which resides in the 6-20kft layer, inaccessible to the boundary layer. Conditions therefore remain relatively dry and clouds rather thin even along windward slopes this afternoon. Leeward Big Island represents the lone exception due to diurnal heating upslope. A couple of heavy showers developed as a result, but this activity will dissipate with the onset of nocturnal stabilization later this evening.

Mid-level heights will steadily rise through the end of the week as the height field rebounds from the departing upper trough. By Sunday, longwave ridge amplification will develop over the central and north-central Pacific at Hawaii's approximate longitude. This ridge will be anchored by a closed mid-level high characterized by 500mb heights as high as 595dm centered over northern portions of the state. As surface high pressure over the eastern Pacific strengthens in response, this will place the Hawaiian Islands firmly downstream of the strongest subsidence. As a result, breezy trades will likely undergo further strengthening while persistent dry advection from the east maintains a strong degree of stability. This is expected to translate to a dry trades pattern characterized by limited showers over windward slopes during the day and a greater coverage of light showers at night and in the early mornings.

AVIATION.

Surface high pressure to the north of the islands will maintain a moderate to locally strong trade wind flow into tomorrow. AIRMET Tango remains in effect for low level mechanical turbulence to the lee of the mountains on all islands. Anticipating this AIRMET to remain in place over the next several days. Expect clouds and showers to remain focused over windward and mountain areas in the trade wind flow. Brief MVFR conditions are possible, but not anticipating any significant mountain obscuration.

MARINE.

High pressure far north of the state will slowly drift eastward and build from Friday into the weekend. Trade winds will begin to gradually strengthen tonight through the weekend. Widespread strong trades are expected over the Hawaiian waters by Sunday. The Small Craft Advisory has been expanded and extended through the weekend. This SCA will likely need to be expanded in coverage sometime over the weekend as the trades increase further.

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 Hawaiian Islands.

Southerly swell activity will remain rather low for this time of the year with just background swells expected from the south and southeast. Nearly flat conditions will continue for north and west facing shores into early next week.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . JVC AVIATION . M Ballard MARINE . Kino


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 ENE 5.1 G 8 80°F 80°F1015.5 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, HI84 mi73 minVar 510.00 miMostly Cloudy84°F70°F63%1016.6 hPa

Link to 5 minute data for PHTO

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Last 24hrNE9NE8NE5E3E5CalmSW4SW4W3SW4CalmSW4CalmSE6S3SW3SW4E9NW4E8E8E856
1 day agoNE10E7NE53CalmW5W4W5W4CalmSW4SW4CalmSE5W6W8W7W3NE8W4N6NE10E9NE9
2 days agoNE10E10E6E12E11W7SW5SW4W4CalmW3SW4SW4CalmCalmW3CalmNE8NE8NW7NE9E7NE7NE9

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Thu -- 01:03 AM HST     0.21 feet Low Tide
Thu -- 05:57 AM HST     Sunrise
Thu -- 07:43 AM HST     1.69 feet High Tide
Thu -- 11:11 AM HST     Moonset
Thu -- 12:35 PM HST     0.76 feet Low Tide
Thu -- 06:43 PM HST     1.94 feet High Tide
Thu -- 07:03 PM HST     Sunset
Thu -- 11:18 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.50.91.21.51.71.71.51.310.80.80.91.11.41.71.91.91.81.51.20.8

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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