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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:02AM | Sunset 6:42PM | Sunday August 25, 2019 5:41 AM HST (15:41 UTC) | Moonrise 1:15AM | Moonset 2:49PM | Illumination 24% |  |
PHZ123 Big Island Leeward Waters- 339 Am Hst Sun Aug 25 2019
.small craft advisory in effect through early Monday morning...
Today..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the day.
Tonight..West of the big island, west winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the night.
Monday..West of the big island, southwest winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 7 feet. Isolated showers.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Isolated showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 feet.
Tuesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers in the evening.
Wednesday..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 4 feet. Southwest swell 3 feet.
Thursday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers.
.small craft advisory in effect through early Monday morning...
Today..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the day.
Tonight..West of the big island, west winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the night.
Monday..West of the big island, southwest winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 7 feet. Isolated showers.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Isolated showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 feet.
Tuesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers in the evening.
Wednesday..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 4 feet. Southwest swell 3 feet.
Thursday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers.
PHZ100 339 Am Hst Sun Aug 25 2019
Synopsis for hawaiian coastal waters.. High pressure far north of the state will drive fresh to strong trade winds into Monday, with the strongest winds due today. As the high weakens and moves away from the islands, trade winds gradually decrease Monday through Wednesday.
Synopsis for hawaiian coastal waters.. High pressure far north of the state will drive fresh to strong trade winds into Monday, with the strongest winds due today. As the high weakens and moves away from the islands, trade winds gradually decrease Monday through Wednesday.
7 Day Forecast for Marine Location Near Captain Cook, HI
Hourly EDIT Helplocation: 19.46, -155.96 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 251357 afdhfo area forecast discussion national weather service honolulu hi 400 am hst Sun aug 29 2019 Synopsis Trade wind weather will continue through Monday, thanks to high pressure far north of the area. Clouds and passing light showers will tend to favor windward and mauka areas with most leeward locations remaining dry. Winds will slowly slack beginning Tuesday through the rest of the week as a low pressure develops far north of the area, with a mixed trade wind and land and sea breezes weather regime expected. Discussion A surface high pressure centered far north of the state will continue to bring moderate to locally breezy trade wind to the area through Monday. Meanwhile, a mid level ridge will remain near the islands as well, and serve to keep airmass in the island vicinity mainly stable. Both early morning lihue and hilo soundings pretty much confirmed airmass stability, with trade wind inversion based at around 6 to 7 thousand feet. Furthermore, hilo sounding is slightly drier, with precipitable water near one and three quarter of an inch. Latest satellite imagery indicated a line of low clouds spread across the windward areas from the big island to oahu, and will reach kauai in the next few hours. Radar data indicated these showers are passing the islands somewhat swiftly, and are affecting mainly windward and mountain areas. Due to the quick movement of these showers in a mostly stable airmass, precipitation amounts will stay mostly on the light side. Do expect current weather pattern to persist through Monday. Hence, trade wind weather will prevail, with mainly light windward and mauka showers expected. Afternoon and evening clouds and showers are also expected over the leeward big island slopes. Changes in the weather are expected beginning Tuesday, as the high current far north of the area is forecast to weaken and move off to the northeast. Moreover, a low pressure system is expected to develop far north of the area. This will result in the trade winds to slowly weaken quite a bit over the later half of the week. Localized land and sea breezes may develop under this lighter trade wind regime. Forecast charts only showed a slight increase in airmass instability. Thus, shower activity will be highly dependent on available moisture and still be primarily focused over windward and mauka areas. Daytime heating may allow for afternoon clouds and showers to develop over interior sections as well as over the |
leeward big island slopes. Aviation High pressure north-northeast of hawaii continues to bring breezy trade winds to the state. Airmet tango continues for mechanical turbulence downwind of all the mountains below 8,000 feet. This airmet will likely continue through today and into tonight with little change in winds expected. Vfr conditions are expected to prevail with passing MVFR conditions in passing clouds and showers primarily over windward slopes. Marine Fresh to strong easterly trade winds will spread westward today as high pressure holds far north of the state and a surface trough northwest of kauai moves away. The small craft advisory (sca) has been expanded from the typically windy waters around the big island and maui to briefly cover maui county windward waters and the kaiwi channel today. Trades will gradually decrease during the first half of the work week as the high weakens and drifts to the northeast. The SCA will likely be trimmed back to the typically windy waters on Monday and should be dropped entirely by Tuesday. South shore surf will be at summertime background levels for the next couple of days, and a southwest swell out of the tasman sea is due to arrive Tuesday and peak Wednesday and Thursday. Islands in the southwest pacific usually block a significant amount of energy from swell sources out of the tasman sea, but we could see inconsistent sets above august average during the peak. This swell will decrease heading into next weekend. Expect a slight and brief increase in east shore surf today as trades strengthen, followed by a gradual decline to near average conditions on Monday and well below august average for the remainder of the week. Small north shore surf will fade today as a small pulse of northwest swell diminishes. Hfo watches warnings advisories Small craft advisory until 6 am hst Monday for maalaea bay- pailolo channel-alenuihaha channel-big island leeward waters-big island southeast waters. Small craft advisory until 6 pm hst this evening for kaiwi channel-maui county windward waters. Discussion... Hui aviation... M ballard marine... Powell |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| KWHH1 | 40 mi | 59 min | NNE 2.9 G 6 | 81°F | 83°F | 1012.7 hPa | ||
| ILOH1 - 1617760 - Hilo, HI | 51 mi | 53 min | WSW 2.9 G 5.1 | 74°F | 82°F | 1014.7 hPa |
Wind History for Kawaihae, HI
(wind in knots) EDIT (on/off) Help| 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | |
| Last 24hr | SE G19 | SE G11 | NW G14 | W | NW G16 | W | W | W | W | SW | W | W | W | W | SE G16 | E G25 | NE G24 | E G20 | E G17 | E G19 | E G10 | NE | E G10 | N |
| 1 day ago | S G4 | NE | N | W | W | W | W | SW | SW | SW | SW | SW | W | NW | W G7 | SE | NE | E G17 | E G13 | E G20 | E G17 | E G17 | E G16 | E G18 |
| 2 days ago | NE | NE | W | W | W | W | SW | SW | W | W | SW | SW | SW | SW | W | SW | NW | N G5 | NE | NE | E | NE | -- | NE |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Kailua / Kona, Keahole Airport, HI | 13 mi | 69 min | ENE 3 | 10.00 mi | Mostly Cloudy | 79°F | 71°F | 79% | 1012.9 hPa |
Link to 5 minute data for PHKO
Wind History from HKO (wind in knots)
| 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | |
| Last 24hr | E | E | Calm | SW | SW | S | S | SW | SW | W | W | W | SW | SE | SE | SE | E | E | ||||||
| 1 day ago | E | SE | SE | S | SW | SW | SW | SW | W | W | SW | W | SW | S | S | SE | E | SE | E | Calm | Calm | |||
| 2 days ago | NE | E | S | S | SW | SW | SW | SW | SW | W | SE G17 | SE | SE | E | SE | SE | SE | SE |
Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
EDIT Weekend mode (on/off) (on/off) Help One Week of DataNapoopoo
Click for Map
Sun -- 01:14 AM HST Moonrise
Sun -- 04:49 AM HST 0.26 feet Low Tide
Sun -- 06:06 AM HST Sunrise
Sun -- 12:32 PM HST 2.22 feet High Tide
Sun -- 02:49 PM HST Moonset
Sun -- 06:44 PM HST Sunset
Sun -- 07:58 PM HST 0.53 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 01:14 AM HST Moonrise
Sun -- 04:49 AM HST 0.26 feet Low Tide
Sun -- 06:06 AM HST Sunrise
Sun -- 12:32 PM HST 2.22 feet High Tide
Sun -- 02:49 PM HST Moonset
Sun -- 06:44 PM HST Sunset
Sun -- 07:58 PM HST 0.53 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 0.9 | 0.8 | 0.6 | 0.4 | 0.3 | 0.3 | 0.4 | 0.6 | 0.9 | 1.3 | 1.7 | 2 | 2.2 | 2.2 | 2 | 1.8 | 1.4 | 1.1 | 0.8 | 0.6 | 0.5 | 0.6 | 0.7 | 0.9 |
Tide / Current Tables for Kailua Kona, Big Island, Hawaii
EDIT (on/off) Help One Week of DataKailua Kona
Click for Map
Sun -- 01:14 AM HST Moonrise
Sun -- 04:47 AM HST 0.24 feet Low Tide
Sun -- 06:06 AM HST Sunrise
Sun -- 12:23 PM HST 2.22 feet High Tide
Sun -- 02:49 PM HST Moonset
Sun -- 06:44 PM HST Sunset
Sun -- 07:41 PM HST 0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 01:14 AM HST Moonrise
Sun -- 04:47 AM HST 0.24 feet Low Tide
Sun -- 06:06 AM HST Sunrise
Sun -- 12:23 PM HST 2.22 feet High Tide
Sun -- 02:49 PM HST Moonset
Sun -- 06:44 PM HST Sunset
Sun -- 07:41 PM HST 0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 0.9 | 0.8 | 0.6 | 0.4 | 0.3 | 0.2 | 0.3 | 0.6 | 0.9 | 1.3 | 1.7 | 2 | 2.2 | 2.2 | 2 | 1.7 | 1.3 | 1 | 0.7 | 0.5 | 0.5 | 0.6 | 0.7 | 0.9 |
Weather Map and Satellite Images
(on/off) HelpWeather Map
GOES 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 (11,2,3,4)
(on/off) Help
Ground Weather Radar Station South Shore, HI
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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 numerious 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. |