Thursday, March4, 2021
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Marine Weather and Tides
Kalihiwai, HI

Version 3.4
NOTICE
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 6:48AMSunset 6:38PM Thursday March 4, 2021 12:13 AM HST (10:13 UTC) Moonrise 12:00AMMoonset 11:03AM Illumination 68% Phase: Waning Gibbous; Moon at 20 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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PHZ111 Kauai Windward Waters- 900 Pm Hst Wed Mar 3 2021
.small craft advisory in effect through early Thursday morning...
Rest of tonight..Northeast winds to 25 knots. Wind waves 7 feet. Northwest swell 7 feet. Scattered showers early in the evening, then isolated showers after midnight.
Thursday..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 7 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Thursday night..Northeast winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet. Scattered showers.
Friday..Northeast winds to 25 knots. Wind waves 7 feet. North swell 8 feet. Showers likely.
Friday night..East winds 20 knots. Wind waves 8 feet. North swell 8 feet. Scattered showers.
Saturday..East winds to 25 knots. Wind waves 8 feet. North swell 7 feet. Scattered showers.
Saturday night..East winds 20 knots. Wind waves 8 feet. North swell 6 feet. Scattered showers.
Sunday..East winds 20 knots. Wind waves 7 to 9 feet. North swell 5 to 6 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 8 to 10 feet. North swell 5 feet. Scattered showers.
PHZ100 900 Pm Hst Wed Mar 3 2021
Synopsis for hawaiian coastal waters.. Robust high pressure far north of the state will produce strong trade winds and large rough seas for most waters. Trade winds will weaken slightly early tomorrow, then restrengthen Friday into early next week.


7 Day Forecast for Marine Location Near Kalihiwai, HI
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location: 22.22, -159.43     debug


Area Discussion for -
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FXHW60 PHFO 040629 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 829 PM HST Wed Mar 3 2021

SYNOPSIS. Fairly typical trade wind weather will persist through Thursday, with showers favoring windward and mauka areas, particularly at night and into the early morning hours. A surface trough will develop in the vicinity of the islands Thursday night and Friday, then slowly shift westward Friday night. This will bring wet trade wind conditions particularly to windward sections of the smaller islands. As the trough shifts westward over the weekend, more typical trade wind weather will return, with the trades rebounding back to breezy levels. The trades will strengthen further Monday through the middle of next week, with windy and wet conditions expected.

DISCUSSION. Currently at the surface, a 1037 mb high is centered around 1400 miles northwest of Honolulu, and is driving moderate to breezy trades across the island chain this evening. Infrared satellite imagery shows a band of low clouds moving through the smaller islands, with mainly partly cloudy conditions over the Big Island. Radar imagery shows scattered to numerous showers moving into windward sections of Kauai and Oahu, with a few showers spreading leeward from time to time.Across the Big Island a few isolated showers are present in both windward and leeward areas. Main short term concern revolves rain chances during the next couple days.

High pressure northwest of the islands will weaken slightly as it settles slowly southeastward during the next couple days. Meanwhile, a weak surface trough will develop along the tail end of an old front near or just north of the islands Thursday night and Friday. This trough will keep the tightest gradient north of the state, and maintain trade winds generally at moderate moderate levels through Friday. As the trough shifts westward Friday night and Saturday, a new strong 1040 mb high will build north of the state. This high will then slowly settle southeastward while maintaining its strength of around 1040 mb through the middle of next week. As a result, we should see breezy conditions over the weekend, with windy conditions (possibly advisory level winds) developing Monday through the middle of next week.

As for the remaining weather details, the band of clouds and showers moving through the smaller islands this evening, will gradually sink southward into the Big Island and increase shower coverage here later tonight. Meanwhile, we should see a decrease in shower coverage from north to south across the smaller islands after midnight. Fairly dry trade wind weather is then expected on Thursday, although windward sections of Kauai will likely see more shower coverage than the remainder of the state. Quite a bit of high cloud cover will be overspreading the islands as well due to an upper level trough digging to the northwest of the island chain.

Moisture will begin to pool along a weak surface trough developing over or just north of the islands Thursday night and Friday, with this trough then sliding slowly westward Friday night. The moisture associated with the surface trough combined with added instability from a trough aloft, will lead to an increase in shower coverage and intensity across the islands during this time, with the potential for some locally heavy rainfall over windward areas. The latest 00Z GFS model cycle suggests that the surface trough and deepest moisture may slide by just to the north of the state, while the 12Z ECMWF suggests a weaker surface trough which keeps the deepest moisture targeting the smaller islands, particularly Kauai and Oahu. Will stick with the current plan for now which resembles the ECMWF solution, but if the new 00Z ECMWF model cycle follows the latest 00Z GFS trend, we may need to adjust rain chances downward slightly. Considerable cloudiness will prevail through the period due to a combination of high and low clouds.

Once the surface trough shifts west of the state, we should see a return of more typical trade wind weather over the weekend. Showers will favor windward and mauka areas, particularly at night and during the early morning hours, with a few showers spreading into leeward communities from time to time. Models suggest that deeper moisture may arrive Monday through the middle of next week, resulting in wet trade wind conditions across the island chain. Additionally, moisture may extend high enough to allow for a thunderstorm or two to develop over the Big Island each afternoon Saturday through next Wednesday.

AVIATION. At the surface, and area of high pressure remains rooted northwest of the state allowing for breezy northeast trade winds to continue to flow over the main Hawaiian Islands. However, speeds are expected to weaken a bit over the next day or two before increasing once again heading into the weekend. Aloft, a strong 250mb jet remains in place across the southern half of the state this evening but is forecast to exit to the east overnight tonight. Model data suggests that moderate turbulence will continue to be a possibility throughout the overnight hours but should wane early Thursday morning. For now, AIRMET Tango remains in effect for tempo moderate turbulence between FL220 and FL300 across the state, as well as for tempo moderate low level turbulence on the leeward side of mountains.

Latest satellite and radar imagery this evening show a band of showers currently moving across the smaller islands. Periodic showers and brief MVFR conditions will continue for the next couple of hours until this band of moisture diminishes as it moves southwest. For the rest of the night and throughout the day on Thursday, showers will continue to ride in on the trade wind flow and impact mainly north through east sections of the islands, though most showers should remain light with only brief periods of MVFR ceilings/visibility.

MARINE. A Small Craft Advisory (SCA) remains in effect for all zones except Big Island Windward and Maui County Leeward waters through tonight. Winds and seas will slowly diminish as the high to our north weakens, and the SCA may be scaled back tomorrow as strong trade winds and elevated seas persist only over northwest waters. SCA conditions may return for most waters Friday due to building seas, and extend over the weekend as the high is reinforced and strong trades become more widespread.

Surf heights remains below High Surf Advisory (HSA) threshold across all shores this evening. Surf along east facing shores will continue to subside through tomorrow. A bump in east shoreline surf will occur late Friday night into the weekend as trade wind swell increases and an arriving north swell wrap fills in. A northwest swell will continue to fill tonight, peaking at or just below HSA threshold along north and west-facing shores late tomorrow into Friday. A secondary, reinforcing north swell will arrive Friday night and, in addition to the returning trade wind swell wrap, may boost north facing shore surf heights to, or slightly above, HSA heights Friday into Saturday and slowly diminish Sunday. A small, long- period southwest swell will fill in tomorrow, providing a small bump in south shore surf, and slowly decline through the weekend.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Thursday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel- Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Jelsema AVIATION . Vaughan MARINE . Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 19 mi56 min NE 12 G 15 72°F 80°F1020.8 hPa
51WH0 - WHOTS - Woods Hole Ocean Time-series 77 mi104 min 74°F1020.1 hPa

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI17 mi21 minNE 1610.00 miOvercast71°F60°F68%1020.6 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi78 minE 410.00 miFair66°F57°F73%1020 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Thu -- 01:14 AM HST     0.53 feet Low Tide
Thu -- 06:02 AM HST     0.87 feet High Tide
Thu -- 06:56 AM HST     Sunrise
Thu -- 11:02 AM HST     Moonset
Thu -- 12:06 PM HST     -0.04 feet Low Tide
Thu -- 06:43 PM HST     Sunset
Thu -- 08:12 PM HST     1.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.60.60.70.80.90.80.70.50.20-000.20.50.81.11.41.61.71.71.51.3

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Thu -- 02:40 AM HST     0.53 feet Low Tide
Thu -- 06:55 AM HST     Sunrise
Thu -- 07:13 AM HST     0.77 feet High Tide
Thu -- 11:02 AM HST     Moonset
Thu -- 01:32 PM HST     -0.04 feet Low Tide
Thu -- 06:42 PM HST     Sunset
Thu -- 09:23 PM HST     1.62 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.70.60.50.60.70.70.80.70.60.50.30.1-0-00.10.30.611.31.51.61.61.5

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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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