Friday, October30, 2020
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Marine Weather and Tides
Discovery Harbour, 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 6:19AMSunset 5:48PM Friday October 30, 2020 7:16 AM HST (17:16 UTC) Moonrise 5:40PMMoonset 5:41AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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PHZ124 Big Island Southeast Waters- 330 Am Hst Fri Oct 30 2020
Today..Southwest winds 15 knots. Wind waves 5 feet. Northeast swell 4 feet. Isolated showers.
Tonight..West winds 15 knots. Wind waves 4 feet. Northeast swell 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..Northwest winds 10 knots. Wind waves 3 feet. North swell 3 feet. Isolated showers.
Saturday night..North winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 3 feet in the evening then 2 feet or less. Northwest swell 4 feet. Scattered showers.
Sunday..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Isolated showers in the morning.
Sunday night..East winds 10 knots. Wind waves 2 feet or less then 4 feet after midnight. Northwest swell 4 feet. Isolated showers through the night.
Monday..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 5 to 6 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 5 feet. Northeast swell 4 to 6 feet. Scattered showers.
PHZ100 330 Am Hst Fri Oct 30 2020
Synopsis for hawaiian coastal waters.. A surface low about 375 nm north of the state will likely stall later today, and then will move north-northeast away from the area from tonight through Saturday. A surface ridge is expected to build north of the islands from Sunday into early next week.


7 Day Forecast for Marine Location Near Discovery Harbour, HI
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location: 19.05, -155.63     debug


Area Discussion for -
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FXHW60 PHFO 301332 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 332 AM HST Fri Oct 30 2020

SYNOPSIS. A weak trough approaching the islands from the west will bring moderate west to northwest winds through Saturday along with an uptick in shower coverage. Rainfall should remain light. A ridge will build north of the islands by Monday and bring a return of trade wind weather through most of next week.

DISCUSSION. A dissipating front northeast of the Big Island will continue to lift away from the state today and is no longer a major factor in island weather. Satellite loop and radar show that associated clouds and showers are generally diminishing across the state, and this trend is expected to continue through the day. The short- term exception is the development of a band of stable low clouds across Maui County within the past few hours. Over the summits of the Big Island, a Wind Advisory remains in effect, where southwest winds of 35 to 50 mph are expected through at least this afternoon and possibly through Saturday. A weak trough will trigger scattered showers across the state later today. Westerly winds will increase behind the trough and could produce gusty downslope winds on the east side of the islands.

Over the weekend, the trough will lift off to the northeast, causing local winds to decrease. Light to moderate westerly winds will continue through Saturday and become light and variable on Sunday. Winds should be light enough for the development of afternoon sea breezes on Sunday. This will cause afternoon cloud build ups, along with some scattered showers, over interior areas during the afternoon. Also, a weak upper trough digging south over the area could enhance showers on Sunday.

Models show a surface ridge building north of the islands by Monday. The ridge will produce easterly trade winds over the islands through most of next week.

AVIATION. A low pressure system roughly 400 miles north of Maui will keep light to moderate winds in the forecast. These winds will trend from a westerly direction from late morning through the afternoon. Isolated to scattered showers are forecast, with brief periods of MVFR ceilings possible across the state.

No AIRMETs in effect.

MARINE. A broad surface low pressure system, which is centered about 375 nm north of Honolulu early this morning, has been moving slowly south overnight. It is expected to stall later today, and then move toward the north-northeast from tonight through Saturday. The large circulation around this low will continue to affect the waters adjacent to the islands into Saturday. As a result, light to moderate west to southwest winds will persist over the waters surrounding the Big Island, while light to moderate northwest to west winds are expected over the waters around the smaller islands. Trade winds will gradually return to the state from Sunday into early next week as a surface ridge builds north of the area.

The fetch associated with the surface low north of the islands is sending a north-northwest swell toward the state early this morning. Recent observations from the PacIOOS buoys at Hanalei near Kauai and Waimea Bay near Oahu are showing significant wave heights of around 8 feet and 6 feet, respectively, with a wave period of around 11 seconds at both buoys. The peak surf produced by this swell will likely be later today, with the greatest surf heights expected along northern exposures of Kauai and Oahu. The swell will be on a downward trend from tonight through Saturday. Forerunners from a new long-period northwest swell are expected to arrive late Saturday. This swell will likely build to moderate heights, and shift out of the north-northwest from Saturday night through Sunday. Yet another long-period north-northwest swell is expected to spread across the area from late Sunday night through Monday. Surf produced by this swell may approach the High Surf Advisory criteria along some north and west facing shores of the smaller islands Monday. This north-northwest swell will gradually lower from Tuesday into mid-week.

Surf along south facing shores will remain small into early next week due to a mix of southerly swells. An upward trend in surf along south facing shores is possible next Wednesday due to a slightly larger long-period south swell. Expect tiny surf along east facing shores through this weekend. Surf along east facing shores may trend up slightly early next week as the trade winds return.

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



DISCUSSION . Powell AVIATION . Bohlin MARINE . Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 56 mi47 min SW 1.9 G 2.9 73°F 81°F1009.9 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI46 mi24 minSE 710.00 miOvercast79°F69°F72%1011.6 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSE7S9W10SW8SW10SW10SW12SW10SW9W7SW6SW5SW3CalmW3CalmE3SE3SE5SE5SE4SE5SE6SE7
1 day agoCalmW6W7W7SW8SW8W8W9W8W6W5SW4SE3SE5SE6SE9SE8SE6SE6SE8SE8SE4SE6SE6
2 days agoN5N7NW6NW8NW7W8W7W7NW6W5E13N9E10S8W6E4CalmE3--E7--N5NE5N3

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Fri -- 03:03 AM HST     2.38 feet High Tide
Fri -- 05:40 AM HST     Moonset
Fri -- 06:22 AM HST     Sunrise
Fri -- 09:31 AM HST     0.57 feet Low Tide
Fri -- 02:43 PM HST     1.83 feet High Tide
Fri -- 05:39 PM HST     Moonrise
Fri -- 05:49 PM HST     Sunset
Fri -- 08:52 PM HST     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.92.22.42.321.61.10.80.60.60.81.21.51.81.81.71.410.60.30.20.40.7

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Fri -- 03:13 AM HST     1.98 feet High Tide
Fri -- 05:42 AM HST     Moonset
Fri -- 06:23 AM HST     Sunrise
Fri -- 09:35 AM HST     0.47 feet Low Tide
Fri -- 02:53 PM HST     1.43 feet High Tide
Fri -- 05:40 PM HST     Moonrise
Fri -- 05:50 PM HST     Sunset
Fri -- 08:56 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.51.821.91.71.410.70.50.50.60.91.21.41.41.31.10.80.40.20.10.20.5

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 South Shore, 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.