Sunday, August9, 2020
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Marine Weather and Tides
Kilauea, HI

Version 3.4
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:07AMSunset 7:07PM Sunday August 9, 2020 9:51 AM HST (19:51 UTC) Moonrise 10:33PMMoonset 10:58AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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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7 Day Forecast for Marine Location Near Kilauea, HI
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location: 36.66, -151.22     debug

Area Discussion for -
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Area Forecast Discussion National Weather Service Honolulu HI 343 AM HST Sun Aug 9 2020

SYNOPSIS. A high pressure ridge north of the islands will keep moderate to breezy trade winds in the forecast for the next few days. Wind speeds slowly decrease through the first half of next week. Expect passing showers of the windward and mountain flavor through the week with the highest coverage forecast from the overnight to early morning hours.


Satellite imagery this morning continues to show bands of clouds moving into the islands from the east. These cloud bands will likely support passing early morning showers mainly along windward and mountain slopes of each island with some of the stronger showers drifting into leeward areas.

Elsewhere, a strong high pressure system far north of the Hawaiian Islands will keep moderate to breezy trade winds in the forecast through Monday. Wind speeds will slowly decrease through the first half of next week as the high pressure ridge north of the state weakens and local area pressure gradients decrease. Moderate trade winds will continue through next week Friday. The latest forecast continues to show passing showers each day through the seven day forecast period. Precipitable Water levels range form 1.0 to 1.5 inches and model cross sections support these brief periods of showers. Rainfall coverage will trend higher over windward and areas of each island, especially in the overnight and early morning hours.

Minor adjustments were made to the wind grids this morning with increasing wind speeds over the coastal waters. We expanded the Small Craft Advisory coverage to include coastal waters and channels around Oahu and Kauai. Otherwise global models remain in good agreement with the current weather forecast.

AVIATION. Fresh to locally strong trades will support scattered showers with periods of low ceilings particularly over windward coasts and slopes. Mountain obscuration spread to most of the smaller islands overnight as a band of showery low clouds moved through, prompting an expansion of AIRMET SIERRA to include north through east sections of all the major islands except Lanai. Slightly drier trades are forecast to work into the area later today.

AIRMET TANGO remains in effect below 8000 feet over and immediately south thru west of mountains for tempo moderate turbulence.

AIRMET SIERRA is now in effect above 2500 for the Big Island, Kauai, Oahu, Molokai and Maui.

MARINE. Fresh to strong trade winds will continue into Monday, then trend down Tuesday through midweek as high pressure weakens to the north. Seas will remain at or near the 10 ft advisory level into Monday across the Alenuihaha Channel and over the waters south of the Big Island, then subside Tuesday into midweek. The Small Craft Advisory has been expanded to include most Hawaiian waters through late this afternoon. An extension into tonight for these areas can't be ruled out.

Surf along east facing shores will remain rough into the start of the week due to the gusty trades. Although the surf will lower by midweek as the trades relax locally, an upward trend is possible through the second half of the week. Guidance depicts a decent sized area of strong winds focused at the islands within the 040-050 degree band off the California coast later today through Tuesday, which should correspond to a medium period groundswell out of the northeast arriving around Thursday.

Surf along south facing shores will remain small through the week with mainly a mix of small, short-period southeast and background south-southwest energy moving through.

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

Small Craft Advisory until 6 PM HST this evening for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters- Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters.


Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (15,3,4,5)
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Ground Weather Radar Station Kauai, HI
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