Tuesday, July27, 2021
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Marine Weather and Tides
Launiupoko, 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 5:56AMSunset 7:08PM Monday July 26, 2021 7:07 PM HST (05:07 UTC) Moonrise 9:38PMMoonset 8:35AM 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
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PHZ119 Maalaea Bay- 343 Pm Hst Mon Jul 26 2021
.small craft advisory in effect through early Tuesday morning...
Tonight..North winds to 25 knots. Wind waves 2 feet or less.
Tuesday..North winds 20 knots. Wind waves 2 feet or less.
Tuesday night..North winds 20 knots. Wind waves 2 feet or less.
Wednesday..North winds 20 knots. Wind waves 2 feet or less.
Wednesday night..North winds to 25 knots. Wind waves 2 feet or less.
Thursday..North winds to 25 knots. Wind waves 2 feet or less.
Thursday night..North winds to 25 knots. Wind waves 2 feet or less.
Friday..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds to 25 knots. Wind waves 6 feet.
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 Launiupoko, HI
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location: 20.85, -156.68     debug


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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi98 min ENE 13 G 20 77°F 80°F1016.1 hPa
51205 18 mi42 min 78°F6 ft
51213 18 mi42 min 82°F3 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi4.4 hrsNE 10 G 2315.00 miLight Drizzle81°F70°F70%1016.9 hPa
Kahului, Kahului Airport, HI14 mi74 minENE 18 G 3310.00 miPartly Cloudy and Breezy79°F69°F72%1015.9 hPa
Lanai City, Lanai Airport, HI15 mi72 minNE 15 G 2010.00 miOvercast75°F73°F94%1015.4 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr----------------------------------NE14
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1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Tue -- 12:39 AM HST     0.26 feet Low Tide
Tue -- 05:59 AM HST     Sunrise
Tue -- 06:13 AM HST     1.17 feet High Tide
Tue -- 09:31 AM HST     Moonset
Tue -- 11:10 AM HST     0.46 feet Low Tide
Tue -- 06:10 PM HST     2.15 feet High Tide
Tue -- 07:07 PM HST     Sunset
Tue -- 10:13 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.40.60.91.11.21.110.80.60.50.50.711.41.822.12.11.81.51.10.7

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Tue -- 12:57 AM HST     0.16 feet Low Tide
Tue -- 05:58 AM HST     Sunrise
Tue -- 06:47 AM HST     1.27 feet High Tide
Tue -- 09:30 AM HST     Moonset
Tue -- 11:28 AM HST     0.36 feet Low Tide
Tue -- 06:44 PM HST     2.25 feet High Tide
Tue -- 07:06 PM HST     Sunset
Tue -- 10:12 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.50.811.21.31.10.90.60.40.40.50.81.21.622.22.22.11.71.20.8

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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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