Tuesday, September29, 2020
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Marine Weather and Tides
Hana, 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 6:15AMSunset 6:16PM Tuesday September 29, 2020 5:03 PM HST (03:03 UTC) Moonrise 5:26PMMoonset 4:30AM Illumination 95% 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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PHZ119 Maalaea Bay- 338 Pm Hst Tue Sep 29 2020
Tonight..Northeast winds 15 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Wednesday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Thursday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers through the night.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Saturday..North winds 20 knots. Wind waves 2 feet or less.
Sunday..North winds 20 knots. Wind waves 2 feet or less.
PHZ100 338 Pm Hst Tue Sep 29 2020
Synopsis for hawaiian coastal waters.. Weak ridge north of area will move south slowly as a trough moves over the islands from the east. Another ridge will build over the islands towards the end of the weekend.


7 Day Forecast for Marine Location Near Hana, HI
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location: 20.77, -155.98     debug


Area Discussion for -
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FXHW60 PHFO 300136 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 336 PM HST Tue Sep 29 2020

SYNOPSIS. A weakened ridge just north of the islands will keep winds light and variable into Saturday. Sea breezes will develop each afternoon, increasing cloud cover across mauka areas and producing light rainfall mainly in the late afternoon to early evening hours. Overnight land breezes will clear out any cloud cover and push lingering shower activity offshore. Increased moisture moving into the area from the east may slightly increase shower activity by Wednesday night.

DISCUSSION. There is little forecast philosophy change from this morning. A stalled front north of Kauai has weakened the subtropical ridge, keeping winds light and variable across local waters. Afternoon soundings and satellite loop show that increased moisture and showery low clouds have arrived across portions of the Big Island, where a PW value near 1.3 inches was noted in the Hilo sounding. In contrast, the Lihue sounding showed less than 0.9 inches of PW. Cloud cover has increased noticeably across the Big Island, where broken to overcast low clouds cover most leeward and interior areas. Windward Big Island shores and slopes south of Laupahoehoe have scattered low clouds at this hour. The smaller islands have scattered to patchy broken low clouds across mauka areas. Additional moisture slowly drifting into the islands from the east may reach us Wednesday, possibly increasing shower activity Wednesday night into Thursday morning.

Models show the current pattern will remain in place through the rest of this week, with the subtropical ridge weakened and pushed south near the islands by a stalled front farther to the north. Winds will stay light, allowing local land and sea breezes to develop. Expect increased cloud cover across mauka areas each afternoon and evening, with possible light rainfall. Cloud cover will decrease each night with the development of land breezes.

By Sunday, the front is forecast to weaken and lift out, allowing the subtropical ridge to drift back northward. The pressure gradient will then steepen enough across the state to drive moderate to locally breezy trade winds briefly on Sunday. Light to moderate trades are then expected from Monday onward.

AVIATION. Lack of clouds over inland portions of Kauai through Molokai are a testament to the dry airmass currently in place. Expect very little additional development today even with locally enhanced convergence along sea breezes. As upstream moisture continues to work into the area, clouds and showers presently ongoing over northern portions of the Big Island will expand in coverage to encompass a greater segment of the Windward Big Island coast as well as Maui though VFR is still expected to prevail. Inland cloud development tomorrow may be more efficient than today due to increasing low-level moisture. Land breezes redevelop again tonight.

No AIRMETs are in effect.

MARINE. Light to moderate north easterly trades will allow for a land and sea breeze pattern to continue through the rest of the week. The background flow will shift out of the east Friday into the weekend. A return of fresh easterly trade winds will be possible by then end of the weekend.

Surf along south facing shores will gradually lower through the rest of the week. A late season south swell may arrive locally early next week. More details will follow later in the week once the swell moves through the nearshore PacIOOS spectral buoy in American Samoa.

Surf along north will trend up tonight through the weekend as back- to-back north- northwest swells arrive. The first one is from a storm- force low centered around 1600 nm north of Kauai this afternoon. This source will arrive tonight and gradually become more northerly Wednesday through Thursday as it peaks near the advisory level (15 ft faces). The second swell is forecast to arrive Thursday night, which should keep the surf near the advisory level through the day Friday. This swell combined with a smaller, medium period northwest arriving Friday night into Saturday will keep the surf up through the weekend.

Small east swell from former tropical cyclone Lowell in the eastern Pacific will gradually subside tonight. East swell will continue to subside through the rest of the week due to decreasing tradewinds. Small east tradewind swell will return later over the weekend due to the return of easterly tradewinds. A longer period swell may impact exposed east facing shores due to tropical cyclone Maria in the eastern Pacific.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Powell AVIATION . JVC MARINE . Almanza/Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi45 min N 9.9 G 12 80°F 81°F1011.4 hPa
51205 29 mi37 min 82°F5 ft
ILOH1 - 1617760 - Hilo, HI 87 mi45 min N 9.9 G 13 78°F 83°F1009.6 hPa

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi69 minNNE 1210.00 miA Few Clouds87°F68°F53%1011.7 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrNE13NE10NE9NE8NE8N10N8SW3CalmCalmCalmN4CalmCalmNE4NE11N11NE13N13N14N12NE13NE12N11
1 day agoNE15E10NE10NE11NE15NE11NE4CalmSE4S4SE6CalmSE6CalmNE5NE12NE15NE17NE20NE20N17N16N16NE16
2 days agoNE19NE13NE13NE11NE10NE12E8
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Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Tue -- 01:37 AM HST     1.85 feet High Tide
Tue -- 04:30 AM HST     Moonset
Tue -- 06:14 AM HST     Sunrise
Tue -- 06:59 AM HST     0.39 feet Low Tide
Tue -- 01:38 PM HST     2.46 feet High Tide
Tue -- 05:25 PM HST     Moonrise
Tue -- 06:12 PM HST     Sunset
Tue -- 08:01 PM HST     0.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.81.81.61.30.80.50.40.50.81.21.72.22.42.42.21.81.30.80.40.30.40.71.1

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Tue -- 02:35 AM HST     1.62 feet High Tide
Tue -- 04:32 AM HST     Moonset
Tue -- 06:16 AM HST     Sunrise
Tue -- 08:00 AM HST     0.36 feet Low Tide
Tue -- 02:45 PM HST     2.27 feet High Tide
Tue -- 05:27 PM HST     Moonrise
Tue -- 06:14 PM HST     Sunset
Tue -- 09:03 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.41.61.61.41.10.70.50.40.50.71.11.51.92.22.32.11.71.20.70.40.30.40.6

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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weather_mapweather_map weather_map


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