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Marine Weather and Tides Wainaku, HI Version 3.4

NOTICE 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 6:14AM

Sunset 6:35PM

Sunday March 29, 2020 8:08 AM HST (18:08 UTC)

Moonrise 9:52AM

Moonset 11:20PM

Illumination 31%

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 291445 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 445 AM HST Sun Mar 29 2020

SYNOPSIS. The threat for heavy rainfall and a few thunderstorms will remain in the forecast today due to an upper disturbance in the area. Most of this activity will favor windward and mountain locations with moderate to breezy trades in place. Drier air expected to fill in tonight into Monday will likely allow more of a typical trade wind pattern to briefly return. Rainfall chances will trend back up by midweek as another upper disturbance moves into the area. Trade winds are forecast to become disrupted through this time as a surface trough develops, which should be enough for a land and sea breeze regime to setup Wednesday through Friday. A cold front will approach and move into the area by next weekend.

DISCUSSION. Water vapor imagery showed an upper trough extending west- southwestward over the region from an upper low centered north- northeast of the islands. At the surface, the trough that was positioned near Niihau and Kauai that was a focus for the heavy rainfall Friday night into Saturday has drifted well west of the area this morning. Although more of a trade wind pattern has returned, the threat for heavy windward showers and even a storm or two still exists with the upper trough in place today. Any activity that setups up and focuses over Kauai for any duration will only aggravate the sensitive areas - given the saturated grounds and swollen streams from yesterday's heavy rainfall (8-11 inches in the past 48-hrs). As a result, the Flash Flood Watch has been extended for Kauai County today. The short-term guidance remains in decent agreement and shows the aforementioned surface trough continuing westward and away from the area. The upper low centered near Kauai has opened up and will become absorbed into the broad upper low north-northeast of the islands tonight into Monday. This combined with some drier air filling in will likely allow more of a typical trade wind pattern to briefly return tonight through Monday.

For the extended, a general consensus depicts upper heights lowering once again as another upper trough digs southward into the area. Despite the differences shown between the various model solutions, all show a surface trough emerging over the islands in response to the upper height falls. This will translate to increasing moisture and rainfall coverage across the islands. Although it remains too early to pinpoint the details, the threat for heavy rainfall and thunderstorms will become a possibility where this activity becomes focused for any duration. Trade winds will become disrupted, which should be enough for a land and sea breeze regime to setup Wednesday through Friday. This setup would favor showers setting up over interior areas of the islands through the afternoon hours. Although large timing differences are shown for next weekend, all solutions depict a front approaching and moving into the area. If this front sweeps down the island chain, drier and cooler conditions will become a possibility, especially over the western end of the island chain. If it hangs up to the west of the state, more of a wet pattern will be possible.

AVIATION. A sufficient amount of instability will support heavy showers and a few thunderstorms today, especially this afternoon with daytime heating. Otherwise, mid level ridging will continue to build over the area resulting in a low level inversion at around 8k feet over most islands by this afternoon.

The pocket of heavy showers in the vicinity of Hilo is breaking apart so AIRMET Sierra for mountain obscuration will likely be lowered by 6 am HST. Ditto for the Koolau Mountains on Oahu as the frequency of showers continue to subside. AIRMET Sierra, however, will continue on Kauai as scattered showers continue to roll in with the trades. Perhaps by 18z, these showers will back off enough so to cancel Sierra. Sierra could be needed this afternoon due to the reasoning described above.

Trades have filled in nicely area-wide and will maintain moderate to locally strong through today. The trades are being supplied by a 1030 mb surface high currently located far north of Kauai. Strength of the trades will be trending weaker starting tonight as the high heads toward the southeast. Expect AIRMET Tango for low level turbulence to be lowered sometime after 04z.

Other than for Kauai, VFR condition will be the prevailing flying weather for today. Scattered trade showers riding in with the trades will briefly lower the ceiling and vis, which will be favoring the windward and mountain areas. Afternoon heating will lead to broken to overcast clouds and a few showers over the lee slopes of the Big Island this afternoon as well. AIRMET Sierra is not expected, however. Expect cloud tops between 10 and 15k feet.

Dense high level cirrus will persist over the island skies today. Some thinning may come late this afternoon.

MARINE. High pressure north of the state will keep moderate to strong trade winds in place through Monday. The trades have strengthened slightly overnight, so a Small Craft Advisory (SCA) is now in effect for the typically windy waters around Maui and the Big Island through tonight. The trades will ease into the light to moderate range Tuesday through Wednesday, and become variable across much of the marine area by Thursday. The wind forecast Friday into next weekend remains highly uncertain at this time.

Trade winds over and upstream of the islands will keep advisory level surf going through this afternoon, and a High Surf Advisory remains in effect through 6 PM this evening. East shore surf is expected to drop below advisory levels by tonight, with a very slow and gradual downward trend then expected through the week. A small west- northwest swell is expected to give surf a boost along north and west facing shores Tuesday through Thursday. Small south and southwest swells will continue to keep some surf in place through the week along south facing shores, with a slightly larger south- southeast swell expected boost surf heights a bit Wednesday night through Friday night.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West- Windward Haleakala-South Big Island-Big Island North and East.

Small Craft Advisory until 6 AM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Gibbs AVIATION . H Lau MARINE . Jelsema

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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	69 min	SSW 1.9 G 2.9	67°F	76°F		1015.9 hPa (+1.3)
51206	6 mi	53 min			75°F	8 ft
KWHH1	46 mi	69 min	NE 2.9 G 5.1	73°F	77°F		1015.8 hPa (+1.1)

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

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9 AM

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Last 24hr

E4

N3

NE6

NE6 G9

NE7 G11

NE6 G9

NE6

NE6

E4 G7

E3

SE2

W2

SW1

N6

W4 G7

SW2 G5

SE3

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1 day ago

S1

NE3 G6

S6 G10

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SE3

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N2

NW1

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SW1

W3

SW2

SW2 G8

SW1 G6

SW1 G6

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W4 G8

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S1

2 days ago

W1 G4

N1

E1

W4

NW3

W4

W4

W5

S1

SW1

SW1 G4

SW2 G6

SW2

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SW1

W2 G6

SW2 G5

SW2 G8

SW2 G6

SW2 G6

SW2

SW2

SW2

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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	76 min	SW 4	10.00 mi	Mostly Cloudy	69°F	63°F	81%	1017.4 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)

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E6

Calm

3

E6 G15

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E8

E5

E14

Calm

SW4

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N10

W3

Calm

SE3

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S3

1 day ago

Calm

4

SE10

S6

N5

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Calm

W3

W7

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3

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Calm

2 days ago

W5

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E11 G15

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W4

E5

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3

Calm

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SW7

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Calm

NW3

SW8

SW6

SW7

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SW5

W3

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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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Wind Forecast for (14,3,4,5)

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Ground Weather Radar Station Kohala, HI

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