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Marine Weather and Tides Captain Cook, 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.

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Sunrise 5:53AM

Sunset 7:00PM

Monday July 26, 2021 7:23 PM HST (05:23 UTC)

Moonrise 9:34PM

Moonset 8:34AM

Illumination 92%

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 270146 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 346 PM HST Mon Jul 26 2021

SYNOPSIS. Breezy trade winds will trend lighter for Tuesday and Wednesday as a ridge to our north weakens. The trades will pick back up and become locally windy late in the week and into the weekend. Abundant moisture near the Big Island will keep the weather there a bit more cloudy and showery than usual for the next day or so with localized brief downpours possible. Some of this moisture may spread up the chain through midweek, but drier air is expected to return by the weekend.

DISCUSSION. A ridge of high pressure about 700 miles N of PHNL will maintain breezy trade winds for the next few days. There may be a slight tendency for trades to weaken Tuesday and Wednesday as the ridge weakens. Then trades should trend back up a bit (breezy to locally windy) as a new stronger high consolidates and becomes nearly stationary over the eastern Pacific far to the NE of the islands after that.

While the 00z sounding from PHLI was relatively dry and stable with PW of only 1.3 inches and an inversion near 5000 ft, the PHTO sounding was quite a bit more moist and less stable with a PW near 2 inches and no significant inversion to speak of. This moisture is part of a larger area of moisture which is moving across the Big Island this afternoon and has led to some showers and local downpours over mainly the interior and slopes of Mauna Loa this afternoon. Some of this activity will spread toward the Kona shoreline this evening as it dissipates, but some lingering showers will probably redevelop near the Kona shoreline sometime after dark similar to what we saw last night, and have increased PoPs a bit in this area to reflect this possibility.

Models show the moisture near the Big Island spreading up the chain over the next 24 to 48 hours, but there's actually a fair amount of disagreement among the GFS and ECMWF about how much moisture will do so. For now have maintained continuity-which doesn't show as much of an increase in showers Tuesday night into Wednesday as the GFS suggests-but this is not out of the realm of possibility, especially with very weak mid-level troughing over the western main islands. Otherwise, fairly typical trade wind weather is expected for the next several days. Moisture is expected to decrease after the work week, which should lead to drier weather and more sunshine for the remainder of the forecast period.

AVIATION. Moderate to occasionally breezy east northeasterly trades will help concentrate showers along the windward coasts and slopes through the forecast period, especially along northeast portions of the Big Island. Periods of MVFR ceilings and visibility will likely accompany this activity. Isolated showers are expected elsewhere.

AIRMET TANGO remains in effect for areas below 9000 feet over and immediately south thru west of mountains for tempo moderate turbulence.

AIRMET SIERRA remains in effect for north thru east sections of the Big Island above 2000 feet for mountain obscuration from clouds and showers and is likely to continue through tonight.

MARINE. A Small Craft Advisory will remain in effect for the typically windier waters near Maui County and the Big Island through tonight as surface high pressure located far north of the state maintains locally strong trade winds. The high is expected to weaken slightly Tuesday, resulting in slightly easing trade winds. The high will rebuild north of the area and a surface trough passing by well south of the state will produce locally strong trades Wednesday through the weekend.

Moderate, choppy surf along east facing shores will slowly trend lower tonight through mid-week due to weakening trades near and upstream of the islands. Moderate and choppy surf will return later in the week as trades strengthen.

A mix of small south swells will keep surf small along exposed south shores into the weekend.

Small west-northwest swells, from tropical cyclone activity in the NW Pacific, may arrive along some exposed west and north facing shores starting Thursday or Friday to provide some small surf along exposed shores. However, confidence about the timing and the size of these swells remains low at this time.

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



DISCUSSION . R Ballard AVIATION . TS MARINE . Almanza

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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 Temp	Water Temp	Waves	Pressure	DewPt
KWHH1	40 mi	114 min	SW 11 G 13	82°F	85°F		1014.2 hPa
ILOH1 - 1617760 - Hilo, HI	51 mi	114 min	ENE 7 G 11	77°F	80°F		1015.5 hPa

Wind History for Kawaihae, HI

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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	31 min	Var 6	10.00 mi	Overcast	83°F	71°F	67%	1014.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)

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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: 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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