Tuesday, July27, 2021
Privacy Policy
L-36.com

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.

Sunrise 5:53AMSunset 7:00PM Monday July 26, 2021 7:23 PM HST (05:23 UTC) Moonrise 9:34PMMoonset 8:34AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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
    EDIT      (on/off)   Help
PHZ123 Big Island Leeward Waters- 343 Pm Hst Mon Jul 26 2021
.small craft advisory in effect through early Tuesday morning...
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Scattered showers.
Tuesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Isolated showers in the morning.
Tuesday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Isolated showers in the morning.
Wednesday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Southeast swell 3 feet. Isolated showers in the morning.
Thursday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Southeast swell 3 feet in the evening. Isolated showers.
Friday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Southeast swell 3 feet. Isolated showers.
Saturday..West of the big island, south winds 10 knots in the morning veering northwest, then veering southeast in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Southeast swell 3 feet. Isolated showers.
PHZ100 343 Pm Hst Mon Jul 26 2021
Synopsis for hawaiian coastal waters.. High pressure north of the islands will weaken slightly Tuesday and restrengthen Wednesday through the rest of the forecast period.


7 Day Forecast for Marine Location Near Captain Cook, HI
   Hourly   EDIT   Help
location: 19.46, -155.96     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
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


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
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 TempWater Temp WavesPressureDewPt
KWHH1 40 mi114 min SW 11 G 13 82°F 85°F1014.2 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi114 min ENE 7 G 11 77°F 80°F1015.5 hPa

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
Last
24hr
SW2
G5
W2
G6
SW2
SW2
G5
SW4
G9
W4
G7
W1
W1
--
NE1
W2
G5
--
NW5
W3
NW3
W3
W3
G6
--
SW5
SE1
NE1
SW5
G8
SW1
G5
NE1
G4
1 day
ago
W4
SW1
NW1
NW4
NE3
NW4
G7
N4
G7
NE4
NE4
G7
N3
G6
NE4
N6
G9
NW5
NW4
W6
W6
G9
W2
SW1
G4
W2
G5
SW3
G7
SW4
G8
SW2
G5
SW2
G7
SW3
G8
2 days
ago
N1
N2
--
W2
NW6
W7
W1
G4
SW2
G5
W1
G4
SW2
G5
SW5
SW4
SW5
--
W1

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi31 minVar 610.00 miOvercast83°F71°F67%1014.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
Last 24hrE6NE12NE10NE21
G27
N13N11CalmE4E3SE4SE8E5Calm3W7SW7SW8SW10SW8SW8S10S9S96
1 day agoS5SE5S3S4CalmSE3CalmE4SE5E5E3SE5SE5SW7S9SW9SW8S8SW8SW7SW8S75S7
2 days agoSE8SE5SE5S6SE7----SE6SE8SE6SE3NE3CalmSW7SW9SW9SW11SW9SW9W8W8W6S6S4

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Napoopoo
Click for Map
Tue -- 01:07 AM HST     0.16 feet Low Tide
Tue -- 05:58 AM HST     Sunrise
Tue -- 06:32 AM HST     1.07 feet High Tide
Tue -- 09:28 AM HST     Moonset
Tue -- 11:38 AM HST     0.36 feet Low Tide
Tue -- 06:29 PM HST     2.05 feet High Tide
Tue -- 07:01 PM HST     Sunset
Tue -- 10:10 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.30.20.20.40.70.911.10.90.70.50.40.40.50.81.11.51.8221.81.51.10.7

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
   EDIT      (on/off)   Help   One Week of Data
Kailua Kona
Click for Map
Tue -- 12:55 AM HST     0.18 feet Low Tide
Tue -- 05:58 AM HST     Sunrise
Tue -- 06:17 AM HST     1.02 feet High Tide
Tue -- 09:29 AM HST     Moonset
Tue -- 11:28 AM HST     0.34 feet Low Tide
Tue -- 06:20 PM HST     2.04 feet High Tide
Tue -- 07:02 PM HST     Sunset
Tue -- 10:10 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.30.20.30.50.70.9110.90.70.50.40.40.50.81.21.61.9221.81.51.10.7

Weather Map
       (on/off)   Help Weather Map
wmap_P
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.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.