Tuesday, May26, 2020
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Marine Weather and Tides
Honaunau-Napoopoo, HI

Version 3.4
NOTICE
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 5:40AMSunset 6:54PM Tuesday May 26, 2020 6:09 AM HST (16:09 UTC) Moonrise 9:13AMMoonset 10:51PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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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PHZ123 Big Island Leeward Waters- 324 Am Hst Tue May 26 2020
Today..South winds 15 knots. Wind waves 4 feet. Isolated showers.
Tonight..West of the big island, winds variable less than 10 knots becoming north 10 knots after midnight. NEar south point, east winds 15 knots. Wind waves 4 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Isolated showers in the morning.
Wednesday night..West of the big island, northwest winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 7 feet. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Northwest swell 3 feet in the afternoon. Isolated showers in the morning.
Thursday night..West of the big island, southwest winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 7 feet. Isolated showers.
Friday..West of the big island, northwest winds 10 knots becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 5 to 6 feet. North swell 3 feet. Isolated showers.
Saturday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 15 knots. Wind waves 4 to 5 feet. North swell 3 feet. Isolated showers.
PHZ100 324 Am Hst Tue May 26 2020
Synopsis for hawaiian coastal waters.. Surface ridge will remain near the islands today, then shift northward and strengthen tonight into the second half of the week.


7 Day Forecast for Marine Location Near Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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FXHW60 PHFO 261315 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 315 AM HST Tue May 26 2020

SYNOPSIS. Light winds today will strengthen tonight and Wednesday, with moderate to occasionally breezy trade winds continuing through next weekend. The trade winds will focus low clouds and showers over windward areas, but today's light winds will also allow a few showers to develop over leeward areas in the afternoon. Varying amounts of benign high clouds are expected to move over the islands through Friday.

DISCUSSION. Light E-SE winds today will strengthen and turn toward the ENE tonight and Wednesday as high pressure builds far N of the area. Moderate to occasionally breezy trade winds are then expected to prevail through next weekend, delivering randomly spaced low clouds and showers to windward areas that will favor the overnight and morning hours. Long range guidance suggests moisture associated with a dissipated front will become embedded in the trade wind flow early next week, potentially increasing windward shower coverage.

With winds on the lighter side today, there remains a chance for afternoon sea breezes to fuel some clouds and showers over leeward and interior areas of the smaller islands, but these are expected to be relatively short-lived. A low aloft passing SW of the islands will send varying amounts of high clouds over the islands today into Friday, potentially becoming quite thick at times, but the island atmosphere will remain stable due to a nearby mid-level ridge. Even so, the daily afternoon and evening cloudiness that forms over leeward Big Island will likely drop a few showers, with a chance for briefly moderate to heavy showers.

AVIATION. A weak east-northeast to west-southwest oriented surface ridge is north of the islands early this morning. The close proximity of this feature to the area is keeping the background flow light out of the east or east-southeast across the state. This light wind regime allowed local land breezes to develop over the individual islands overnight. Some low clouds and brief showers will remain possible along east through southeast facing coasts and slopes this morning. As a result, there may be brief periods of MVFR conditions in some of these showers, but VFR conditions will likely prevail across most of the state this morning.

With the light background wind pattern, expect local sea breezes to develop starting later this morning across most of the state. This may cause clouds with a chance of showers over some leeward and interior sections of the islands this afternoon. Some of the heavier showers might produce brief periods of MVFR conditions, but VFR conditions are expected to prevail across most of the state this afternoon.

No AIRMETs are in effect at this time, and none are anticipated through this afternoon.

MARINE. Light to moderate east-southeast winds will hold today over the western end of the state, which will allow land and sea breezes to develop near the coasts. Farther east over Maui County and the Big Island, moderate to fresh trade winds are expected. Fresh to strong trade winds are forecast to return by Wednesday statewide as the ridge retreats northward and strengthens. Winds may reach Small Craft Advisory levels across the typically windy waters around the Big Island and Maui Wednesday into the weekend.

Surf along north facing shores will gradually trend down today as the small, medium-period, north-northwest swell fades. An upward trend is expected Wednesday through the second half of the week due to a storm-force low that has developed around 1000 nautical miles north-northwest of the state. This swell will shift around out of the north late Thursday through Saturday as the source passes to the north today. For the extended, guidance depicts low pressure developing over the far northwest Pacific near the western Aleutians with strong breezes setting up over a large area within the 300-330 degree band relative to the islands. If this materializes, a small northwest swell will be a possibility around next Tuesday.

Surf along south facing shores will remain small into midweek with mainly a combo of south-southwest and south-southeast energy moving through. An upward trend is anticipated by Thursday night as a new, long-period, south-southwest swell arrives. This will hold through Friday, then gradually trend down over the weekend.

For the extended, latest analysis showed 962 mb low pressure passing south-southeast of New Zealand over the past 24-hrs. Satellite data reflected this and showed a large area of gales within Hawaii's swell window in this area and seas reaching the 28 to 32 ft range. WAVEWATCH III shows this source building at Pago Pago Thursday night through Friday with a peak expected there through the day Saturday. This translates to an arrival in Hawaii through the day Monday and a peak centered around the Wednesday time frame of next week.

Surf along east facing shores will remain small through the weekend.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Birchard AVIATION . Houston MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 37 mi51 min E 1 G 1.9 74°F 80°F1016.3 hPa
ILOH1 - 1617760 - Hilo, HI 40 mi51 min SSW 1.9 G 4.1 68°F 78°F1015.7 hPa
51206 45 mi53 min 78°F5 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi76 minE 510.00 miOvercast74°F66°F79%1015.9 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi71 minNE 410.00 miFair43°F38°F84%1017.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrNE4NW6NW7W5NW10W10W12W12W14W11W12W8NW3SW3S5S5SE8S7SE9CalmS5SE3E5N5
1 day agoSE4SW3SW6SW7SW6SW10SW7SW8W9W14W11SW5E11SE12SE13SE7SE7S6E5E5E3E4NE5NE5
2 days agoE5S4SW4SW7SW9W9SW9SW9SW10W8W6W6S4CalmSE5SE5SE5SE6SE43SE8N6SE8SE8

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Tue -- 02:10 AM HST     0.09 feet Low Tide
Tue -- 05:45 AM HST     Sunrise
Tue -- 06:18 AM HST     0.46 feet High Tide
Tue -- 09:13 AM HST     Moonrise
Tue -- 11:08 AM HST     -0.02 feet Low Tide
Tue -- 06:56 PM HST     Sunset
Tue -- 07:03 PM HST     2.09 feet High Tide
Tue -- 10:51 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.20.10.10.30.40.50.40.30.20.1-000.20.50.91.31.722.121.81.41

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 01:53 AM HST     0.18 feet Low Tide
Tue -- 05:45 AM HST     Sunrise
Tue -- 06:13 AM HST     0.53 feet High Tide
Tue -- 09:13 AM HST     Moonrise
Tue -- 11:04 AM HST     0.08 feet Low Tide
Tue -- 06:55 PM HST     2.16 feet High Tide
Tue -- 06:57 PM HST     Sunset
Tue -- 10:52 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.20.20.20.40.50.50.50.40.30.10.10.10.30.611.51.82.12.22.11.81.41

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
Wind Forecast for (12,3,4,5)
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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.