Wednesday, October28, 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 6:31AMSunset 5:58PM Wednesday October 28, 2020 4:41 PM HST (02:41 UTC) Moonrise 4:42PMMoonset 4:13AM Illumination 93% 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- 329 Pm Hst Wed Oct 28 2020
Tonight..West winds 10 knots. Wind waves 2 feet or less. Showers likely and slight chance of Thunderstorms.
Thursday..Southwest winds 10 knots. Wind waves 2 feet or less. North swell 3 feet in the afternoon. Scattered showers and slight chance of Thunderstorms.
Thursday night..Southwest winds 10 knots. Wind waves 2 feet or less. North swell 3 feet. Scattered showers.
Friday..Southwest winds 10 knots. Wind waves 3 feet. North swell 4 feet. Scattered showers.
Friday night..Southwest winds 15 knots. Wind waves 3 feet. North swell 4 feet. Scattered showers.
Saturday..West winds 10 knots. Wind waves 2 feet or less. North swell 4 feet. SWell north 3 feet. Scattered showers.
Saturday night..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 3 feet and northwest 3 to 4 feet. Isolated showers.
Sunday..Winds variable less than 10 knots becoming northeast 10 knots. Wind waves 2 feet or less. North swell 3 feet and north 4 to 6 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 2 feet or less. North swell 3 feet and north 6 to 7 feet. Isolated showers.
PHZ100 329 Pm Hst Wed Oct 28 2020
Synopsis for hawaiian coastal waters.. A cold front over oahu will continue southeastward to maui county tonight through Thursday before stalling and dissipating. A much weaker front will approach and move into the area Friday into the weekend. A ridge of high pressure will build north of the area late Sunday into next week.


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 290146 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 346 PM HST Wed Oct 28 2020

SYNOPSIS. Unsettled weather with spotty heavy showers and thunderstorms will continue along and ahead of a weak front clearing Oahu early this evening and stalling over Maui County tonight and Thursday. West winds behind the front will bring less humid conditions and will send shallow shower bands over the islands Friday and Saturday, followed by a brief return of light trade winds early next week.

DISCUSSION. A weak front is moving eastward over Oahu this afternoon. The front extends northward to a deep cutoff low parked roughly 650 miles north of the islands, and a supporting upper level trough remains centered just west of Kauai. This upper level feature remains strong enough to trigger pockets of heavy showers and thunderstorms along the front near Oahu and over Molokai this afternoon. The instability ahead of the upper trough is also producing spotty showers along Big Island slopes this afternoon. The front cleared Kauai early this afternoon, leaving some clouds and shallow showers along north facing slopes and delivering a a cooler and drier airmass. Temperatures on Kauai are now running about 5 degrees cooler than the other islands, and dew points have dropped across portions of Kauai have fallen into the lower 60s.

The front will clear Oahu by early evening then move to Molokai and Maui, which will have the greatest chances for showers and thunderstorms tonight. Though we cannot rule out a brief heavy shower over Oahu during the next couple of hours, the flood threat is rapidly diminishing, and the Flash Flood Watch has been cancelled. Kauai will see a post-frontal airmass with light showers confined to northern slopes. On the Big Island, leeward areas mainly north of Kailua-Kona could see a shower or thunderstorm overnight, while the rest of the island experiences diminished shower chances.

The increasingly shallow and diffuse front will stall and fall apart near Maui or northern Big Island on Thursday and Friday as the parent surface low drops down to around 350 miles north of the islands. Showers will likely remain concentrated along the weakening front, but moderate to potentially breezy westerly winds will also deliver a few showers to most islands, especially along leeward slopes. On Friday, these winds could become gusty over some windward communities due to downsloping off of terrain. In addition, there will be a noticeable drop in humidity behind the front.

During the weekend, the low will lift off to the northeast, but the islands will continue to see some showers dropping down from the north from time to time as the winds switch from westerly to northerly. The latest runs of the GFS and ECMWF show a narrow upper level trough redeveloping overhead on Sunday, which could trigger a few heavy showers.

Heading into early next week, the GFS and ECMWF both depict a surface ridge passing north of the state, suggesting a brief return of light trade winds.

AVIATION. Convection capable of producing MVFR/localized IFR will remain possible for Oahu through Maui through tonight as the prefrontal moisture moisture axis works through central portions of the state. In the near term, prevailing VFR can be expected for all locations. However, AIRMET Sierra may be required overnight. Southwest wind will veer to northwesterly and ceilings will improve in the wake of the front.

MARINE. A cold front currently over Oahu will continue to advance down the island chain toward Maui County tonight into Thursday as it begins to weaken and stall. Light to moderate south to southwest winds will continue over Maui County and the Big Island waters through Thursday. For the Kauai and Oahu waters, west winds will increase into the moderate range. Expect this general pattern to continue into the weekend as a second (much weaker) front moves into the area. In addition to the winds, heavy showers and a few thunderstorms remain possible along and ahead of the front through tonight.

Surf along north and west facing shores will continue to ease as a long-period, north-northwest swell lowers. A short-period, moderate northerly swell associated with low pressure north- northwest of the islands is expected arrive tonight into Thursday. This source will linger into the weekend with the highest surf expected along northern exposures of Kauai and Oahu. Another long- period, northwest swell is expected Saturday night, then shifting from the north-northwest as the source low shifts northeast toward the Aleutians.

Surf along east facing shores will steadily trend down as the small, northeast swell eases into the weekend.

Surf along south facing shores will remain small through the weekend with mainly background swells. An upward trend is expected around next Wednesday, due to a late season active pattern evolving near New Zealand.

HFO WATCHES/WARNINGS/ADVISORIES. Wind Advisory from 6 PM this evening to 6 PM HST Friday for Big Island Summits.



DISCUSSION . Wroe AVIATION . JVC MARINE . TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 2 mi125 min N 13 G 15 81°F1009.9 hPa
51207 3 mi45 min 82°F4 ft
51210 3 mi45 min 82°F4 ft
51202 - Mokapu Point, HI (098) 7 mi45 min 82°F3 ft
OOUH1 - 1612340 - Honolulu, HI 11 mi113 min 83°F
51211 14 mi41 min 82°F2 ft
51212 21 mi45 min 82°F4 ft
51201 - Waimea Bay, HI (106) 22 mi64 min 82°F5 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 hrsN 116.00 miLight Rain78°F73°F87%1008.7 hPa
Daniel K Inouye International Airport, HI10 mi48 minSW 910.00 miMostly Cloudy82°F68°F63%1009.9 hPa
Wheeler Air Force Base / Oahu, HI12 mi45 minNNW 710.00 miOvercast74°F73°F98%1009.6 hPa
Oahu, Kalaeloa Airport, HI17 mi48 minWNW 1210.00 miOvercast79°F71°F77%1011.4 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmSW3CalmCalm--SW4S3CalmCalm5SW6W5W5SW4N9N11N11N11N9
1 day agoNE8SE5SE6SW35W3SW5CalmCalm2CalmCalmCalmCalmNW3S43CalmNW4--N3CalmCalmCalm
2 days agoE6E7E6E4E5CalmSW3W3CalmCalmCalmCalmCalmCalmCalmNW5W8N7N663Calm5N5

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Wed -- 01:34 AM HST     1.58 feet High Tide
Wed -- 04:13 AM HST     Moonset
Wed -- 06:32 AM HST     Sunrise
Wed -- 07:36 AM HST     0.52 feet Low Tide
Wed -- 01:10 PM HST     1.58 feet High Tide
Wed -- 04:41 PM HST     Moonrise
Wed -- 05:56 PM HST     Sunset
Wed -- 07:44 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.61.61.41.20.90.70.60.50.70.91.21.51.61.51.310.70.40.20.20.30.61

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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weather_mapweather_map weather_map


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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.