Saturday, October16, 2021
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Marine Weather and Tides
Kahului, 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 6:20AMSunset 6:02PM Friday October 15, 2021 9:55 PM HST (07:55 UTC) Moonrise 3:27PMMoonset 2:03AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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
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PHZ119 Maalaea Bay- 916 Pm Hst Fri Oct 15 2021
.small craft advisory in effect through Saturday afternoon...
Rest of tonight..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds to 25 knots. Wind waves 3 feet.
Saturday night..North winds 20 knots. Wind waves 3 feet in the evening then 2 feet or less. Isolated showers.
Sunday..North winds to 25 knots. Wind waves 3 feet.
Sunday night..North winds to 25 knots. Wind waves 3 feet in the evening then 2 feet or less.
Monday..North winds 20 knots. Wind waves 2 feet or less.
Monday night..North winds 20 knots. Wind waves 2 feet or less.
Tuesday..North winds 15 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds 15 knots. Wind waves 2 feet or less.
PHZ100 916 Pm Hst Fri Oct 15 2021
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend. The trades will ease into the light to moderate range Monday through the middle of next week, as a front approaches from the north.


7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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FXHW60 PHFO 160647 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 847 PM HST Fri Oct 15 2021

SYNOPSIS. Breezy trade winds will persist through the weekend, supported by high pressure to the north. Clouds and passing showers will favor windward and mauka areas, with a few soaking showers possible this weekend. Lighter trade winds are expected for most of next week, as a front slowly approaches the area from the north. The dissipating front may reach Kauai by Thursday, potentially spreading to the other islands next Friday and Saturday, bringing an increase in mainly windward showers.

DISCUSSION. High pressure passing N of the islands will maintain breezy trade winds through the weekend, pushing showery and stable low clouds into windward coasts and slopes, with a few showers spilling leeward on the smaller islands. Water vapor imagery shows a trough aloft to the NW of Kauai, with afternoon soundings indicating modest instability. Infrared satellite images indicate some taller clouds moving along with the trade flow, and these may bring a few soaking showers over the weekend as the trough develops into a cut off low NW of Kauai. As this occurs, mid-level cooling will be maximized near Kauai and Oahu, as 500 mb temps drop a little, from -7C to - 10C.

As the cut-off low moves away to the W early next week, a ridge aloft will build over the islands from the SE. Additionally, a large low will traverse the N Pacific, weakening the ridge to the N and pushing it toward the islands. This will lead to weaker trade winds starting Monday, with winds becoming light and variable by Wednesday as a front assoicated with the passing low presses S toward the islands. This combination should lead to fewer showers.

Latest guidance indicates the front may reach Kauai by Thursday, then sag southward over the other islands Friday and Saturday. High pressure building N of the area will support strengthening trade winds, out of the NE initially, and push most of the assoicated moisture into windward areas. Still questions as to the timing, strength, and how far S the front will extend, as one might expect with a 6-8 day forecast.

AVIATION. High pressure north of the state will support continued breezy trade winds through tonight, though speeds will slowly wane throughout the day on Saturday. For now, AIRMET Tango remains in effect for moderate low-level mechanical turbulence over and immediately south through west of mountains of all islands. This AIRMET will likely remain in effect for Maui County and the Big Island throughout the forecast period, but may be cancelled for western portions of the state by early Saturday as surface winds in these areas gradually decrease.

Satellite and radar imagery this evening shows just a few scattered showers and clouds mostly along windward sections of the islands and adjacent waters. This is especially true for the Big Island, where AIRMET Sierra remains in effect for tempo mountain obscuration from Upolu Point to Cape Kumukahi to Apua Point this evening. Elsewhere, showers and MVFR conditions will remain more isolated in nature and favor north through east sections of the islands throughout the period. Isolated to scattered showers will return to the Kona slopes of the Big Island again Saturday afternoon, though VFR conditions are expected to prevail.

MARINE. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend. A Small Craft Advisory remains in effect for the typically windy waters around Maui and the Big Island through 6 PM Saturday. This SCA will likely need to be extended through the day Sunday with the morning forecast package. The trades are expected to ease into the light to moderate range Sunday night through the middle of next week as a cold front approaches from the north, and this will likely keep winds below SCA thresholds.

Surf will slowly lower through the weekend, but will hold close to normal levels. Surf will continue to lower through the upcoming work week, and will remain well below normal levels during this time.

The current small northwest swell will keep some small surf in place along north and west facing shores through the weekend. A larger north-northwest swell is forecast to build late Tuesday and Tuesday night, then peak on Wednesday, with surf possibly nearing advisory levels. This swell will then gradually lower on Thursday, followed by an even larger north to north-northeast swell next Friday.

Background energy will keep small surf along south facing shores into early next week. The next small, long period south swell is forecast to reach the islands Tuesday and slowly lower through late next week.

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



DISCUSSION . Birchard AVIATION . Vaughn MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi61 min NE 11G12 76°F 78°F1017.9 hPa

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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E17
G22
E16
E8
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G13
N5
G8
NE4
G8
N8
NE6
E9
G13
NE6
G10
NE9
E13
G18
E14
G19
E16
G22
NE11
G17
NE12
G17
NE12
G16
E10
G14
NE11
G15
NE10
G17
NE10
G14
NE12
NE10
E13
G16
1 day
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NE12
G18
NE11
G15
NE12
G15
NE10
G13
NE11
G14
E12
G16
NE12
NE11
G14
NE10
NE11
G15
NE14
G20
E12
G20
NE15
G19
NE18
G22
NE19
G23
NE15
G20
E22
G27
NE19
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G28
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G21
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NE12
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G20
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G21
NE14
G19
NE15
NE15
G19
NE18
G22
NE21
G27
E24
G31
E23
G30
E24
E18
G27
E19
G24
E20
E16
G22
NE12
G20
NE13
G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi61 minNE 1210.00 miMostly Cloudy75°F67°F76%1018.1 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrNE12NE14
G21
NE8NE9NE9NE6NE5NE9NE9NE7NE11NE13
G19
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NE16
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NE18NE18
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NE12NE13NE12
1 day agoNE12NE14NE15NE12NE11NE12NE12NE14NE13NE14NE16
G23
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E17
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NE15NE14
G26
2 days agoNE18
G27
NE23
G30
NE14
G24
NE18
G27
E7NE19
G25
NE21NE16
G23
NE15NE16NE20
G27
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G28
NE16
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G35
NE22
G36
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E25
G32
NE21
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NE25
G34
NE17
G24
NE12NE15
G23
NE14

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sat -- 12:09 AM HST     1.48 feet High Tide
Sat -- 03:00 AM HST     Moonset
Sat -- 05:41 AM HST     0.47 feet Low Tide
Sat -- 06:21 AM HST     Sunrise
Sat -- 12:26 PM HST     2.47 feet High Tide
Sat -- 04:05 PM HST     Moonrise
Sat -- 06:00 PM HST     Sunset
Sat -- 07:02 PM HST     0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.5
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1.4
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0.7
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0.6
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1
9
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1.4
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1.9
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2.2
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2.4
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2.2
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1.8
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1.3
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0.9
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Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sat -- 01:49 AM HST     1.54 feet High Tide
Sat -- 03:00 AM HST     Moonset
Sat -- 06:21 AM HST     Sunrise
Sat -- 06:40 AM HST     0.50 feet Low Tide
Sat -- 01:30 PM HST     2.27 feet High Tide
Sat -- 04:05 PM HST     Moonrise
Sat -- 06:00 PM HST     Sunset
Sat -- 07:57 PM HST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1
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0.5
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0.9


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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