Tuesday, September29, 2020
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Marine Weather and Tides
Kahaluu, 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 6:21AMSunset 6:21PM Tuesday September 29, 2020 2:38 AM HST (12:38 UTC) Moonrise 5:34PMMoonset 4:37AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 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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PHZ116 Kaiwi Channel- 924 Pm Hst Mon Sep 28 2020
Rest of tonight..Northeast winds 10 knots. Wind waves 4 feet. Isolated showers.
Tuesday..Northeast winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the morning.
Tuesday night..Northeast winds 10 knots. Wind waves 4 feet. North swell 3 feet. Isolated showers.
Wednesday..Northeast winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 feet in the morning then 2 feet or less. North swell 5 feet. Isolated showers in the morning.
Wednesday night..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 7 feet. Isolated showers through the night.
Thursday..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 7 feet. Isolated showers.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 6 feet. Isolated showers through the night.
Friday..East winds 10 knots. Wind waves 2 feet or less. North swell 7 to 8 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 3 to 5 feet. North swell 6 to 7 feet. Isolated showers.
PHZ100 924 Pm Hst Mon Sep 28 2020
Synopsis for hawaiian coastal waters.. Ridge will remain weak as a series of fronts pass to the north.


7 Day Forecast for Marine Location Near Kahaluu, HI
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location: 21.46, -157.8     debug


Area Discussion for -
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FXHW60 PHFO 290640 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 840 PM HST Mon Sep 28 2020

SYNOPSIS. A stalled cold front north of the islands will keep light and variable winds in the forecast into Saturday. Afternoon sea breezes will develop building clouds over island mountain and interior sections with isolated to scattered showers mainly in the afternoon to early evening hours. Off-shore land breezes will develop after sunset, clearing out any cloud cover. A weak disturbance moving into the area from the east may bring a slight increase in shower activity by Wednesday night.

DISCUSSION. The satellite picture this evening shows a cold front stalling roughly 400 miles north of Kauai. This front will remain well north of the island chain, weakening the subtropical ridge, and keeping light large scale winds in the forecast. A weak disturbance, associated with the remnants of former TC Lowell, is located roughly 450 miles east of Hilo. Higher moisture levels and cloud bands associated with this disturbance will slowly drift into the islands possibly producing a slight increase in shower activity from Wednesday night to Thursday morning. Clouds over the Hawaiian Coastal waters look fairly stable with less overnight shower activity built into the forecast. Land breezes will also pick up over all islands later tonight adding stability to the atmosphere.

The subtropical ridge that typically provides moderate trade winds over the islands will remain in a weakened state through the week due to the stalled cold front. In the absence of large scale winds, local scale afternoon heating and overnight cooling of each island will drive land and sea breeze circulations. Convergent sea breezes will develop each day building clouds over island mountain and interior sections. These convergent cloud bands will produce isolated to scattered showers, especially in the late afternoon to early evening hours as solar heating decreases, and the clouds begin to collapse. Any rainfall activity will be brief and result in light precipitation amounts. Divergent land breezes developing after sunset will stabilize the weather pattern over each island and clear out most of the cloud cover. Expect this land and sea breeze weather pattern to continue into Saturday.

Warm temperatures and slightly higher humidity levels are forecast during the daytime hours. Cooler temperature trends will develop each night due to enhanced radiational cooling under mostly clear skies.

The long range forecast shows little change as global models remain in good agreement with the sea breeze pattern lasting into Saturday morning. A band of tropical moisture may move in from the southeast by the end of the week, increasing humidity levels, and possibly producing higher showers along the southeast slopes of the Big Island. Southeasterly flow aloft typically creates a rain shadow affect for islands in the lee or west of the Big Island. Lowering the potential for showers over the smaller islands. There are early signs of a return to trade winds by Saturday afternoon and breezy trade winds from Sunday into the first half of next week. Stay tuned.

AVIATION. Weak easterly flow will lead to land breeze development across the islands later tonight. Isolated showers will continue over the smaller islands with scattered showers poised to affect windward Big Island. Brief MVFR ceilings and visibility may occur with this activity, but not expecting anything widespread.

No AIRMETs are currently in effect.

MARINE. Light to moderate easterly trades will relax enough for a land and sea breeze pattern to setup tonight that will continue through the rest of the week. The background flow will shift out of the north-northeast Tuesday through Thursday, then potentially shift back out of the east Friday into the weekend. A return of moderate to fresh easterly trade winds will be possible by then end of the weekend.

Surf along south facing shores will remain up into Tuesday - gradually lowering as the south swell that filled in over the weekend eases. Buoy numbers were impressive today and remained up slightly above predicted. The evening offshore buoy observations, however, do reflect a downward trend, which will be observed through the day Tuesday given the travel time. A mix of southeast trade wind swell and background small, southerly energy should be enough to keep the surf from going flat Wednesday into next weekend.

For the long range, the active trend continues down south around New Zealand within Hawaii's swell window. The latest surface analysis and satellite data reflect this and depict a storm-force low near southern New Zealand with a broad area of gale- to storm- force winds over our swell window from the Tasman Sea to south- southeast of New Zealand. Altimeter passes showed seas up above 30 ft in this area earlier today, which is in line with drifting SOFAR buoys in the general area. This will translate to a late season south swell that should arrive locally early next week (Oct. 5th time frame). More details will follow later in the week once the swell moves through the nearshore PacIOOS spectral buoy in American Samoa.

Surf along north facing shores will remain small through Tuesday, then trend up once again Tuesday night through the weekend as back-to-back north-northwest swells arrive. The first one is from a compact storm-force low centered around 1200 nm north of the islands this evening. This source will arrive Tuesday night and gradually become more northerly by 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.

Surf along east facing shores will pick up as a small, easterly swell from former tropical cyclone Lowell in the eastern Pacific builds across the islands from east to west. This swell is showing at the Hilo PacIOOS buoy and should fill in across the western end of the island chain Tuesday. A downward trend is expected through the second half of the week due to the lack of trades locally and upstream of the islands.

The large daily tide cycles will gradually trend down toward the monthly minimum each day through the first week October.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Bohlin AVIATION . JT MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 2 mi63 min NE 4.1 G 6 79°F 1013.7 hPa
51207 3 mi43 min 81°F4 ft
51210 3 mi43 min 81°F4 ft
51202 - Mokapu Point, HI (098) 7 mi43 min 81°F4 ft
OOUH1 - 1612340 - Honolulu, HI 11 mi51 min ENE 2.9 G 7 78°F 81°F1013.8 hPa
51211 14 mi69 min 81°F3 ft
51212 21 mi43 min 82°F3 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi1.7 hrsENE 610.00 miPartly Cloudy79°F70°F74%1012.9 hPa
Daniel K Inouye International Airport, HI10 mi46 minN 410.00 miA Few Clouds75°F68°F79%1013.3 hPa
Wheeler Air Force Base / Oahu, HI12 mi43 minN 410.00 miFair70°F65°F87%1013.3 hPa
Oahu, Kalaeloa Airport, HI17 mi46 minN 010.00 miFair72°F66°F82%1014.3 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hr--SE5E10E7E11E10E9E10E10NE9NE9NE8NE10NE7NE8NE6E5E6E5E6NE5NE5NE6NE5
1 day agoE5E45E6E8E6E7E9NE11
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2 days ago5CalmCalmE7E7E10
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Tide / Current Tables for Waikane, Kaneohe Bay, Oahu Island, Hawaii
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Waikane
Click for Map
Tue -- 01:04 AM HST     1.65 feet High Tide
Tue -- 04:37 AM HST     Moonset
Tue -- 06:22 AM HST     Sunrise
Tue -- 07:04 AM HST     0.59 feet Low Tide
Tue -- 01:05 PM HST     2.26 feet High Tide
Tue -- 05:33 PM HST     Moonrise
Tue -- 06:20 PM HST     Sunset
Tue -- 08:06 PM HST     0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.71.61.41.10.90.70.60.711.41.82.12.32.21.91.61.20.80.60.50.60.81.2

Tide / Current Tables for Moku o Loe, Kaneohe Bay Oahu Island, Hawaii
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Moku o Loe
Click for Map
Tue -- 01:26 AM HST     1.45 feet High Tide
Tue -- 04:37 AM HST     Moonset
Tue -- 06:22 AM HST     Sunrise
Tue -- 07:08 AM HST     0.59 feet Low Tide
Tue -- 01:27 PM HST     2.06 feet High Tide
Tue -- 05:34 PM HST     Moonrise
Tue -- 06:20 PM HST     Sunset
Tue -- 08:10 PM HST     0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.41.41.31.10.90.70.60.60.91.21.61.9221.91.61.20.80.60.50.50.71

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 Molokai, HI
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