Monday, October18, 2021
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Marine Weather and Tides
Halaula, 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 6:15AMSunset 5:55PM Monday October 18, 2021 9:13 AM HST (19:13 UTC) Moonrise 5:12PMMoonset 4:45AM Illumination 94% Phase: Waxing Gibbous; Moon at 13 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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PHZ121 Alenuihaha Channel- 323 Am Hst Mon Oct 18 2021
.small craft advisory in effect through late this afternoon...
Today..East winds to 25 knots. Wind waves 10 feet. North swell 3 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 9 feet. North swell 3 feet. Isolated showers.
Tuesday..Northeast winds 20 knots. Wind waves 8 feet. North swell 3 feet.
Tuesday night..Northeast winds 15 knots. Wind waves 6 feet. North swell 3 feet.
Wednesday..Northeast winds 20 knots. Wind waves 7 feet. North swell 4 feet.
Wednesday night..East winds 20 knots. Wind waves 7 feet. North swell 6 feet. Isolated showers after midnight.
Thursday..East winds 20 knots. Wind waves 8 to 9 feet. North swell 6 to 8 feet. Isolated showers.
Friday..East winds to 25 knots. Wind waves 10 feet. North swell 7 to 8 feet. Isolated showers.
PHZ100 323 Am Hst Mon Oct 18 2021
Synopsis for hawaiian coastal waters.. Locally strong trades will be trending down through Tuesday as the ridge north of the islands weaken. A couple of fronts will dissipate over th windward waters Wednesday and Thursday. High pressure settles into the area north of the islands Thursday, resulting in trade winds reaching locally strong on Friday.


7 Day Forecast for Marine Location Near Halaula, HI
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location: 20.24, -155.77     debug


Area Discussion for -
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FXHW60 PHFO 181414 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 414 AM HST Mon Oct 18 2021

SYNOPSIS. The locally breezy trade winds will continue to transport low clouds and brief showers across windward and mauka areas today. The high clouds will gradually decrease in coverage near Kauai as upper-level low pressure west of the state moves away. Weakening trade winds and a drier weather pattern are expected from later today and tonight into mid-week. The trade winds are forecast to strengthen again starting late Thursday or Friday. Windward showers may also increase over some islands later this week.

DISCUSSION. A nearly east to west oriented subtropical ridge is evident about 600 miles due north of Honolulu. A surface trough in the deep tropics appears to be about 550 miles south-southeast of South Point on the Big Island. The islands remain sandwiched between these two features, which is maintaining the relatively tight pressure gradient across the region. As a result, gusty trade winds persist over most of the island chain, especially around the Big Island.

Aloft, mid- and upper-level low pressure systems are centered nearly 550 miles west-northwest of Lihue. As these stacked areas of low pressure continue moving westward, the atmosphere is gradually stabilizing this morning. The low-level trade wind inversion is beginning to become established again based on the early morning sounding profiles from Lihue and Hilo. Loops of infrared satellite imagery indicate the coverage of cirrus clouds along the southeastern flank of the low pressure aloft has also decreased overnight. Some cirrus will likely persist over portions of the island chain (especially Kauai) into this afternoon. Radar reflectivities show isolated to locally scattered showers moving into the windward sections of some of the islands.

The high resolution forecast guidance indicates the breezy trade winds will likely persist into this afternoon. As the upper trough continues moving west of the state, expect increasing stability to develop across the area. At the same time, the surface ridge north of the state will likely weaken as it moves southward from tonight through Wednesday. The background flow is forecast to also be from a northeast direction from tonight into mid-week. Expect less low clouds and fewer trade showers, as well as decrease in the coverage of the high clouds tonight.

The background flow is forecast to be weak enough Tuesday and Wednesday to allow an alternating pattern of local afternoon sea breeze and nighttime land breeze circulations to develop. This may allow clouds and isolated showers to form over some interior and leeward sections of the island chain each afternoon. At night, most of the clouds and showers will likely dissipate as the land breezes develop, In addition, brief light showers may move into the northeast sections of some of the islands, especially late at night.

Looking ahead to Thursday, the forecast models continue to depict surface high pressure building far north of the state. This will likely push a diffuse band of low clouds and showers associated with a remnant frontal boundary down towards the state. The recent runs of the forecast models appear to be in some agreement that some of the clouds and showers in the band may reach Kauai. However, the ECMWF continues to keep the bulk of the moisture just north of the islands east of Kauai. For the moment, the latest forecast continues to indicate low clouds and showers will increase over most windward sections of the smaller islands from Thursday into Friday. The models also remain in general agreement that the trade winds will eventually strengthen starting late Thursday, with locally breezy trades potentially returning on Friday.

AVIATION. High pressure north of the islands will keep moderate trade winds in place today, with the trades expected to trend lower tonight. Low clouds and showers will bring brief MVFR cigs and vsbys to windward and mauka areas, mainly during the overnight and early morning hours. A stray shower may also spill over into leeward communities, but most leeward areas will remain dry. Overall, predominantly VFR conditions should prevail at the TAF sites during the next 24 hours.

AIRMET Tango remains in effect for moderate low level turbulence over and downwind of the terrain of all islands. This AIRMET will likely be lowered at some point later today.

MARINE. The moderate to locally strong trade winds will be trending down to moderate speeds by this evening. The overnight ASCAT pass revealed the locally strong trades hanging tough, thus the Small Craft Advisory (SCA) has been extended until 6 pm HST today. The cause of the lighter trades is the ridge north of the islands being weakened by a series of fronts from storm systems over the far northeast Pacific. A front or two will make its way into the northern offshore waters this Wednesday and Thursday, where both fronts are expected to fall apart before reaching the Hawaiian Islands. High pressure reestablishes north of the islands Thursday through Friday, resulting in a boost in the trades to locally strong levels for select waters around Maui County and the Big Island, as well as the issuance of a SCA.

As the trade winds ease, the surf along the east facing shores will be lowering a little each day as well. Today's surf will be similar to Sunday, but will be on a decline each day for the next couple of days. The boost in the trades on Friday will lead to increasing surf along the east facing shores over the upcoming weekend.

We are expecting a series of north-northwest to north swells this week, with the first of three due in today. This small pulse will be reinforced by a slightly larger north-northwest swell Tuesday night through Wednesday. A larger north swell follows in on Thursday night and Friday, where surf is likely to reach advisory levels for the north facing shores. Also, Kahului Harbor and other north facing harbors will be susceptible to moderate harbor surges from this north swell. A Marine Weather Statement addressing this will likely be issued prior to the event. A gradual lowering of this swell will occur over the weekend.

A series of small to moderate northwest to north-northwest swells will take up the first half of next week. Surf along the south facing shores will be small into next week. There is a long 14 to 15 second period south swell due in tonight, lasting through Wednesday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST this evening for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Houston AVIATION . Jelsema MARINE . H Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi74 min S 1G1.9 79°F 79°F1017.9 hPa (+1.6)
ILOH1 - 1617760 - Hilo, HI 52 mi74 min W 5.1G8 73°F 80°F1018.1 hPa (+1.3)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi74 min NE 8.9G9.9 75°F 77°F1019.2 hPa (+1.6)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI34 mi76 minSE 510.00 miFair59°F47°F66%1028.1 hPa

Link to 5 minute data for PHSF

Wind History from HSF (wind in knots)
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W9W8SE3------------------------SE5SW4
1 day agoSE9S4SW9SW4SE6S3S7NW3SE6E7E50E6E6E7E8E10E10E10E6E5E9SE8SW4
2 days ago------------------------------------------------

Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
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Mon -- 02:30 AM HST     1.73 feet High Tide
Mon -- 04:45 AM HST     Moonset
Mon -- 06:19 AM HST     Sunrise
Mon -- 08:29 AM HST     0.45 feet Low Tide
Mon -- 02:14 PM HST     1.79 feet High Tide
Mon -- 05:12 PM HST     Moonrise
Mon -- 05:57 PM HST     Sunset
Mon -- 08:43 PM HST     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Mon -- 02:54 AM HST     1.71 feet High Tide
Mon -- 04:45 AM HST     Moonset
Mon -- 06:19 AM HST     Sunrise
Mon -- 08:45 AM HST     0.26 feet Low Tide
Mon -- 02:47 PM HST     1.84 feet High Tide
Mon -- 05:12 PM HST     Moonrise
Mon -- 05:57 PM HST     Sunset
Mon -- 09:04 PM HST     -0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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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