Wednesday, November25, 2020
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Marine Weather and Tides
Halaula, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:34AMSunset 5:41PM Wednesday November 25, 2020 12:11 AM HST (10:11 UTC) Moonrise 3:08PMMoonset 2:50AM Illumination 76% 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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PHZ121 Alenuihaha Channel- 910 Pm Hst Tue Nov 24 2020
.small craft advisory in effect through Wednesday afternoon...
Rest of tonight..East winds to 25 knots. Wind waves 8 feet. Slight chance of Thunderstorms and isolated showers.
Wednesday..East winds to 25 knots. Wind waves 7 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Wednesday night..East winds 20 knots. Wind waves 6 feet. Scattered showers through the night.
Thursday..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. Isolated showers through the day.
Thursday night..Northeast winds to 25 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the evening. Scattered showers after midnight.
Friday..Northeast winds to 25 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers.
Friday night..Northeast winds 20 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers.
Saturday..Northeast winds 20 knots. Wind waves 4 to 5 feet. Northwest swell 4 to 5 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 4 to 5 feet. Northwest swell 5 feet. Isolated showers.
PHZ100 910 Pm Hst Tue Nov 24 2020
Synopsis for hawaiian coastal waters.. Northeastern high pressure will weaken slightly and this will gradually lower trades through mid week. Trades will restrengthen and back a little more northeast in response to a weakening front passage.


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 250659 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 859 PM HST Tue Nov 24 2020

SYNOPSIS. A moist and unstable airmass will bring the potential for a few lingering downpours across the state through Wednesday, with a thunderstorm or two possible over the Big Island Wednesday afternoon. A more stable trade wind weather pattern will return Wednesday night and hold through the Thanksgiving Day weekend. Showers will favor windward and mauka areas during the long weekend, with a stray shower reaching leeward areas from time to time.

DISCUSSION. Currently at the surface, a trough of low pressure is located around 150 miles west of Kauai and is moving westward at around 15 mph. Meanwhile further from the islands, a 1034 mb high is centered around 1600 miles northeast of Honolulu, while a cold front is located around 1150 northwest of Kauai. The resulting gradient is producing moderate trades across the island chain this evening. Infrared satellite imagery shows a mix of high and low clouds across the state producing partly to mostly cloudy conditions. Radar imagery shows scattered showers moving into windward areas, with a few of the more substantial showers making it into leeward locales from time to time. The greatest instability has shifted south and west of the islands where the only thunderstorm activity is seen at the moment. Main short term concerns focus on the potential for heavy rainfall and thunderstorms overnight, as well as the Flash Flood headline.

High pressure northeast of the state will slide eastward and weaken over the next couple days, as a cold front approaches from the northwest. This will allow the trades to ease slightly, but they should hold at moderate levels through Thursday. The cold front will fizzle out north of the islands Thursday night and Friday, as a new high builds north of the state, and this should strengthen the trades back up to locally breezy levels. Trades should then hold at locally breezy levels through the weekend, before easing into the light to moderate range as a new front approaches from the northwest.

As for the remaining weather details, the greatest instability and deepest moisture has exited to the west of the islands, and this should lead to a decrease in the potential for heavy rainfall and thunderstorms. A few brief downpours will be possible over the next 24 hours or so, but the threat for widespread heavy rainfall and flooding has diminished considerably. Therefore the Flash Flood Watch for Maui and the Big Island has been cancelled with the evening package. The threat for thunder has diminished as well, with linger thunder chances expected to remain confined to the waters south and west of the state. The one exception is over the Big Island Wednesday afternoon, where daytime heating and terrain effects may lead to a thunderstorm or two. Elsewhere, we should see a return to a more typical trade wind shower regime.

Fairly typical trade wind weather should then prevail Wednesday night through the Thanksgiving Day weekend and into early next week. Showers will favor windward and mauka areas with a stray shower reaching leeward areas from time to time. There is the potential for some old frontal remnants and some cooler weather to move into the islands over the weekend, but details differ considerably between the GFS and ECWMF at the moment. Given the uncertainty will follow a blended forecast approach until detail become more clear.

AVIATION. Although most of the heavy showers and thunderstorms should remain out over the adjacent coastal waters overnight into Wednesday with the upper trough over the region, a few moving ashore and impacting the islands will remain possible. MVFR CIGS and VSBYS will be expected in and around any showers that develop and move through. Although most of this activity will favor windward and mountain locations, breezy trades will carry some showers into interior and leeward locations periodically.

AIRMET Sierra remains in effect for north through east sections of all islands.

AIRMET Tango for low-level mechanical turbulence remains in effect over and downwind of terrain for the entire area.

MARINE. A slight weakening of northeasterly high pressure will allow for the subtle lowering of trades through mid week. The Small Craft Advisory (SCA) has been scaled back to the typical windier waters and channels surrounding Maui County and those waters south of the Big Island through Wednesday afternoon. After a brief lull in winds late Wednesday through early Thursday, trades are expected to restrengthen and back a bit northeast from Thanksgiving into the holiday weekend in response to the passage of a late week decaying front.

Northwest swells will continue to subside through Wednesday. Low, moderate period northwest swells will arrive Wednesday and Thursday. Slightly larger northwest swells will build Friday and peak out late Saturday into Sunday. As these weekend swells subside early next week, longer period northwesterly swells emanating from a strong weekend North Pacific gale will begin arriving late Sunday. North and west-facing shore surf will again lift to double digit heights by early next week but is forecast to remain below advisory levels.

Weakening easterly trades will have eastern-facing shore surf declining and then leveling out the next few days. Other than a small bit of wrap from the declining east wind wave swell, surf along south-facing shores will remain small through the Holiday weekend.

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



DISCUSSION . Jelsema AVIATION . Gibbs MARINE . Blood


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi53 min ESE 2.9 G 4.1
ILOH1 - 1617760 - Hilo, HI 52 mi53 min SE 2.9 G 5.1 71°F 80°F1017.5 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi53 min ENE 13 G 17

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI34 mi73 minE 610.00 miFair52°F18°F27%1017.1 hPa

Link to 5 minute data for PHSF

Wind History from HSF (wind in knots)
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Last 24hrCalmE5E5NE3E5CalmE6E8SE14
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SE5E7CalmE5E3E7E6E7
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Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
Click for Map
Wed -- 01:17 AM HST     1.63 feet High Tide
Wed -- 02:50 AM HST     Moonset
Wed -- 06:39 AM HST     Sunrise
Wed -- 07:13 AM HST     0.69 feet Low Tide
Wed -- 12:22 PM HST     1.44 feet High Tide
Wed -- 03:08 PM HST     Moonrise
Wed -- 05:42 PM HST     Sunset
Wed -- 06:59 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.61.61.41.210.80.70.70.91.11.31.41.41.310.70.40.20.10.20.40.81.2

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Wed -- 01:35 AM HST     1.63 feet High Tide
Wed -- 02:50 AM HST     Moonset
Wed -- 06:38 AM HST     Sunrise
Wed -- 07:25 AM HST     0.66 feet Low Tide
Wed -- 12:51 PM HST     1.47 feet High Tide
Wed -- 03:08 PM HST     Moonrise
Wed -- 05:42 PM HST     Sunset
Wed -- 07:17 PM HST     0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.61.61.51.310.80.70.70.811.31.41.51.41.10.80.50.20.10.10.30.71.1

Weather Map
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wmap_P
GEOS Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Kohala, HI
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