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Marine Weather and Tides Captain Cook, 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 6:56AM

Sunset 6:08PM

Friday January 22, 2021 5:33 AM HST (15:33 UTC)

Moonrise 1:26PM

Moonset 1:51AM

Illumination 68%

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 Captain Cook, HI

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Area Discussion for -

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FXHW60 PHFO 221340 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 340 AM HST Fri Jan 22 2021

SYNOPSIS. Strong and gusty trade winds will become especially strong over the weekend, delivering passing clouds and showers, some briefly heavy, mainly dampening windward areas. More widespread rainfall may develop early next week as winds remain strong and shift to the southeast.

DISCUSSION. Windy and locally wet trade wind weather will continue through the weekend, although shower frequency may be somewhat reduced today. The strong winds will shift slightly to the SE early next week, with increasing moisture potentially leading to more widespread clouds and showers from Sunday night into Wednesday.

A broad mid- and upper-level low is nearly stationary to the S of the area, with some of the associated layered clouds over the Big Island and parts of Maui. Cooler than normal mid-level temperatures associated with the low are supporting a somewhat unstable island atmosphere, with radar VWPs indicating the low-level moisture riding in on the trade flow extends as high as 10 thousand feet. With fresh to locally strong trade winds being supported by a 1035 mb high to the distant NE, orographic forcing is helping to generate showers over and immediately downstream of the terrain. Meanwhile, many leeward communities remain mostly dry.

While some drying of the upstream flow may lead to some reduction in windward shower frequency today, it is not expected to last long, and somewhat showery trade wind weather is anticipated over the weekend. Mid-level temperatures will remain cooler than normal, and strong trade winds will strengthen as the high to the distant NE moves closer to the islands. The high will be reinforced Saturday and Sunday, reaching a central pressure over 1040 mb, while a deep- layer low develops to the distant W and NW of the islands. A Wind Advisory may be required for parts of the state over the next couple of days, potentially as early as tonight.

The development of the low to the distant NW of the islands is expected to cause the winds to veer to the SE, while a moisture convergence band extending SE from the low creeps towards the islands from the S. Latest guidance indicates this band will move over portions of the islands from Monday into Wednesday - bringing PWAT close to 2", layered cloudiness, and widespread rainfall. Deep moisture and modest instability are expected, so the chance of thunderstorms appears too low to mention thus far. A drying trend is loosely expected thereafter as the band shifts W of the area. High pressure to the distant NE will continue to support locally strong trade winds.

AVIATION. Breezy to locally strong trades will persist through the forecast period. This will facilitate frequent windward showers and occasional leeward drift, particularly overnight. VFR is forecast to prevail at all forecast points with nothing more than brief MVFR within any heavier showers.

AIRMET Tango is in effect for mechanical lee turbulence below 9kft as well as for mod turbulence between FL250 and FL300.

MARINE. Surface high pressure is centered far to the north-northeast of the area, resulting in moderate to locally strong trade winds. The high will get a reenforcement beginning Saturday, causing trade winds to increase across the entire area through the first part of next week. This, combined with higher seas from both a large northwest swell and the trade wind seas, has prompted expansion of the current Small Craft Advisory to include all coastal waters.

A small northwest swell will linger today. Long-period forerunners from a larger west-northwest (310 degrees) swell will fill in late today and tonight. This swell is expected to peak Saturday with an 18 second period and high-end advisory or low-end warning level surf for most north and west facing shores of the smaller islands. The more westerly direction of this swell will allow west facing shores of the Big Island to experience advisory level surf, likely later in the day Saturday. Swell and surf will lower gradually Sunday and Monday, then become rather small for this time of year on Tuesday and Wednesday.

As the trades strengthen this weekend, rough and short-period surf will gradually rise and a High Surf Advisory is likely along east facing shores for several days, beginning Saturday afternoon.

Small, mainly background, southerly swells are expected over the next several days. A slightly larger, south-southwest swell from the Tasman sea is expected to gradually fill in Monday, peak Monday night and Tuesday, then lower Wednesday through Thursday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters.



DISCUSSION . Birchard AVIATION . JVC MARINE . TS

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
KWHH1	40 mi	45 min	E 14 G 20	75°F	78°F		1014 hPa
ILOH1 - 1617760 - Hilo, HI	51 mi	45 min	SSW 2.9 G 4.1	67°F	78°F		1015.4 hPa

Wind History for Kawaihae, HI

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

6 AM

7 AM

8 AM

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11 AM

12 PM

1 PM

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4 PM

5 PM

6 PM

7 PM

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1 AM

2 AM

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Last 24hr

NE4

NE3

NE3

SW4

E11 G16

E13 G19

E7 G24

E11 G24

NW15 G19

W9

W8 G11

W7 G10

SW4 G7

NE8 G21

E20 G31

E18 G27

E16 G24

E17 G24

E17 G25

SE17 G28

E19 G24

NE17 G25

E8 G16

E13 G22

1 day ago

N2 G5

E3 G8

E3 G6

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NW3

W6

W7 G10

S2

W9 G12

SW6

W10

W8

SW4

NE3

NE1

N3

W8

E3

NE2

NE3

NE4

NE1

NE5

N3

2 days ago

SE3

SE2

NW5

N7 G10

SE1

W10

W9

W7

NW7 G10

W7

SW3

S4 G7

SW3

SE3

E3

NE1

NE2

NE3

W1

E1

E2

NE2

N2

E2

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Kailua / Kona, Keahole Airport, HI	13 mi	40 min	NE 5	10.00 mi	A Few Clouds	70°F	65°F	84%	1014 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)

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Last 24hr

SE9

NE7

E7

E3

SE7

S6

S6

SW8

SW7

SE6

SE10

SE7

SE5

NE3

SE3

SE3

E5

E6

E7

W3

N3

SE5

SE6

NE5

1 day ago

N6

E3

SE3

Calm

S7

SE9

S12

S11

S8

S11

SW11

SW15

Calm

SE4

SE6

Calm

E5

NE6

NE7

NE7

NE5

Calm

NE4

E3

2 days ago

E4

Calm

SE9

SE7

SE7

SW8

SW6

W9

NW11

NW13

W12

W9

SW7

S5

SE10

SE11 G20

S8

SE7

SE6

W5

NW5

N8

N12

N8

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Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii

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Tide / Current Tables for Kailua Kona, 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

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