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Marine Weather and Tides Wainaku, HI Version 3.4

NOTICE 8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 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.

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Sunrise 6:15AM

Sunset 5:54PM

Tuesday October 20, 2020 4:38 AM HST (14:38 UTC)

Moonrise 10:31AM

Moonset 9:44PM

Illumination 15%

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.

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7 Day Forecast for Marine Location Near Wainaku, HI

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Area Discussion for -

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FXHW60 PHFO 201358 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 358 AM HST Tue Oct 20 2020

SYNOPSIS. A stationary front near Kauai will continue to weaken over the next few days keeping light and variable winds in the forecast across Hawaii Nei. Enhanced clouds and periods of showers will continue to affect Kauai County and Oahu through at least the Wednesday. More stable conditions with less shower activity is forecast over Maui and Hawaii Counties under a weak ridge aloft. On-shore sea breezes will develop a few hours after sunrise with off-shore land breezes taking over around sunset. These light and variable winds will continue through the weekend under a large scale troughing pattern north of the state.

DISCUSSION. This mornings satellite imagery shows a stationary front located near Kauai this morning with convergent bands of clouds and showers moving up from the south over Kauai, Niihau and Oahu. Local scale radar imagery shows numerous showers moving into the southern slopes of Kauai and scattered showers moving over Oahu. Periods of rainfall will continue today and tonight across the western islands. Enough instability and deeper moisture will persist along and east of the front for isolated thunderstorms over Kauai and Niihau including coastal waters through Wednesday afternoon.

The latest forecast guidance shows the stationary cold front weakening near Kauai over the next few days. However, weak southerly flow will continue to pull up unstable shower bands moving from south to north over the islands of Kauai, Niihau and Oahu through at least Wednesday. More stable air spreads westward to Oahu on Thursday and Friday, with continued unstable air bringing periods of showers into the Garden Isle of Kauai.

Saturday through Tuesday . Another passing front far to the north of the state will pull the remnants of this low pressure system northward away from the islands. This change in the pressure pattern will allow a more stable southeasterly flow to return to much of the state with less rainfall activity in a weak southeasterly flow pattern. This next low pressure system will continue to weaken the subtropical ridge northeast of the state, keeping the Hawaiian Islands in a light wind pattern with land and sea breezes continuing into the first half of next week. On-shore sea breezes will converge over mountains and island interior sections producing isolated to scattered rainfall coverage, mainly in the afternoon to early evening hours.

AVIATION. Moisture convergence E of a stationary front near Kauai is fueling showers within a somewhat unstable southerly flow from Niihau to Oahu. Some of the showers are locally heavy, and isolated thunderstorms are possible, with periods of MVFR VIS/CIG and isolated areas of IFR VIS/CIG. The shower coverage is sufficiently great to warrant AIRMET SIERRA for the S thru W facing slopes of Kauai and Oahu, with showers generally moving from S to N. Meanwhile, a surface ridge near Maui County and the Big Island is supporting a drier and more stable E-SE flow over those islands. A subsidence inversion based around 6000 feet will keep a cap on clouds, and limit shower potential. Little overall change to this pattern is expected through tonight.

MARINE. A stalled boundary will lay across the western offshore waters the next few days. Generally light to gentle southwesterly to variable breezes along and west of this boundary . moderate southerlies east of the boundary where there will be more of an easterly component to the wind east of Maui, more specifically around the Big Island. There is a possibility that there will be periods of stronger, more fresh breezes within the channels and local bays surrounding Maui County. As the parent weak low about 600 miles northwest of Kauai lifts north as an open wave trough at mid week and northeastern high pressure backs further away from the state, this boundary will dissipate through mid to late week. Due to the lack of any appreciable Central Pacific pressure gradient with the high being far off to the northeast, a weak southeasterly flow will be in place by late Thursday. These late week anemic winds will introduce a higher probability of coastal land and sea breezes.

A combination of peak monthly tides and higher-than-predicted water levels by near a foot above MHHW has produced nuisance coastal flooding. Impacts are anticipated around daybreak during peak daily tides. See the latest Special Weather Statement for more details regarding the specific impacts. This should be a short- lived event as daily tidal ranges will lower throughout the second half of the week.

Surf along north and west facing shores will continue to lower through mid week as the higher weekend northwest swell dampens out. Outside of a small east to northeast swell that will impact exposed north-facing shores in the next day or so, very little new swell regions are expected to arrive the next few days. A developing gale over the far northwestern Pacific near the western Aleutians tonight into Wednesday will track east northeast into the Bering Sea through the later half of the week. A large area of strong or gale force winds along the backside of this system will likely be focused along the northwest great circle bands and clip a good portion of the chain. If 25 to 30 foot generated seas south of the Aleutians do materialize, then long period northwest swells will be arriving late Saturday into Sunday. This swell would produce surf heights similar to what was experienced this past weekend along north and west facing shores.

Surf along east-facing shores have trended and will stay up through Thursday as an east-northeast swell arrives from a mid week northerly fetch region forming off the Northern California coast. This will be focused at the islands and be timed to arrive this weekend. Otherwise, weak east to southeasterly winds will continue to produce low surf.

Surf along south-facing shores will remain small through the week as a result of both south and south-southeast background swell energy.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Bohlin AVIATION . Birchard MARINE . Blood

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
ILOH1 - 1617760 - Hilo, HI	0 mi	51 min	SSW 1.9 G 4.1	71°F	81°F		1010.8 hPa
51206	6 mi	56 min			80°F	5 ft
KWHH1	46 mi	51 min	ENE 5.1 G 7	78°F	82°F		1010.9 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI

(wind in knots)    EDIT      (on/off)   Help

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Hilo, Hilo International Airport, HI	1 mi	46 min	WSW 4	10.00 mi	Fair	69°F	61°F	76%	1012 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)

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Tide / Current Tables for Hilo, Hawaii Island, Hawaii

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Tide / Current Tables for Kawaihae, Big Island, Hawaii

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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Ground Weather Radar Station Kohala, HI

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