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Marine Weather and Tides
Version 3.4 |
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 5:51AM | Sunset 7:01PM | Tuesday July 23, 2019 3:47 AM HST (13:47 UTC) | Moonrise 11:40PM | Moonset 11:28AM | Illumination 61% |  |
PHZ122 Big Island Windward Waters- 321 Am Hst Tue Jul 23 2019
Today..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Wednesday..East winds 20 knots. Wind waves 5 feet. Southeast swell 3 feet. Isolated showers.
Wednesday night..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Today..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Wednesday..East winds 20 knots. Wind waves 5 feet. Southeast swell 3 feet. Isolated showers.
Wednesday night..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
PHZ100 321 Am Hst Tue Jul 23 2019
Synopsis for hawaiian coastal waters.. High pressure will remain north of the region through the week. An area of low pressure a few hundred miles southwest of kauai will continue to track northwest and weaken through midweek.
Synopsis for hawaiian coastal waters.. High pressure will remain north of the region through the week. An area of low pressure a few hundred miles southwest of kauai will continue to track northwest and weaken through midweek.
7 Day Forecast for Marine Location Near Laupahoehoe, HI
Hourly EDIT Helplocation: 20.8, -154.34 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 231345 afdhfo area forecast discussion national weather service honolulu hi 400 am hst Tue jul 23 2019 Synopsis Trade wind weather will prevail over the islands through the rest of the week, with passing low clouds and showers affecting mainly windward and mountain areas. A trough of low pressure just southwest of the islands will bring considerable cloudiness to the smaller islands today. Discussion A little more showers have developed over the western portion of the island chain overnight as moisture from a trough of low pressure southwest of the area spread to that area. The trough has also moved far west enough for stronger trade winds to fill back over much of area. Early morning hilo sounding revealed a little more stable airmass, with the return of a trade wind inversion and less overall moisture, though it is still moist above 10 thousand feet. Early morning lihue sounding continued to depict a moist and somewhat unstable airmass, with drier air at the lower to mid levels. As this trough continues to advance further west-northwest away from the area today, its influence on the island weather will slowly diminish. In the mean time, leftover moisture over the western islands will result in higher rain chances for those islands, especially kauai. Meanwhile, mid and high clouds from the convection associated with this system are still covering much of the smaller islands early this morning, and will keep skies rather cloudy for those islands today. High pressure far north-northeast of the islands will provide locally breezy trade winds to the area. Scattered low clouds embedded in the trade wind flow will reach the islands at times, bringing some showers to mainly windward areas. In all, it is pretty much trade wind weather for the area today, except more showers for the western islands and cloudier due to the mid and high clouds. A few convective showers may develop over lee areas in the afternoon and evening on the big island. High pressure will persist generally far north of the area through the rest of the week and may strengthen a little toward the weekend. Meanwhile, an upper level ridge is forecast to move over the region in the next few days. Expect seasonal drier locally breezy trade wind weather to prevail under a more stable airmass for the later part of the week. Forecast solutions continue to show an upper level trough passing over the state over the weekend. This may result in an increase in shower coverage in the island vicinity by the weekend into early next week as the airmass in the area may become less stable. Aviation A high northeast of the area will maintain locally strong east winds |
over the area. Airmet tango is in effect for moderate turbulence in the lee of the mountains. A low southwest of the area continues to move northwest and weaken. Layered clouds from the low have been decreasing. Thick layered clouds still cover kauai county, but the higher clouds have cleared the big island and have thinned over maui count and oahu. Thunderstorms associated with the trough have remained southwest of the islands but will still be possible over the waters southwest of kauai through this morning. Low clouds moving over the islands in the low level easterly flow have been sparse. Localized MVFR ceilings are possible over east sections of the islands but we do not expect to have to issue airmet sierra for mtn obsc. Marine Fresh to locally strong easterly trades will continue through the week as high pressure remains north of the area and a weak low pressure passes to the southwest. Stronger winds will remain across the typically windier locations from maui county to the big island due to terrain accelerations. The current small craft advisory remains in effect through Wednesday and will likely need to be extended through the second half of the week. Heavy showers and a few thunderstorms will remain possible across the leeward kauai waters through tonight as the aforementioned area of low pressure passes. Choppy surf will continue along east facing shores each day due to the trades locally and upstream of the islands. Surf along south facing shores will trend up a notch today through midweek as a south-southwest swell moves through. The latest observations from the offshore buoys to the south have trended up overnight within the 14 to 18 second bands. Surf heights will remain well below advisory levels as this swell moves through the peaks today. As this south-southwest swell eases Wednesday through Thursday, a new southeast swell associated with a recent gale that developed over the southern pacific is forecast to move through late Thursday night. This swell will peak Friday, then lower through the weekend. Hfo watches warnings advisories Small craft advisory until 6 pm hst Wednesday for maalaea bay- pailolo channel-alenuihaha channel-big island leeward waters-big island southeast waters. Discussion... Hui aviation... Donaldson marine... Gibbs |
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 |
| ILOH1 - 1617760 - Hilo, HI | 83 mi | 47 min | SW 1.9 G 2.9 | 73°F | 81°F | 1016.2 hPa (-1.0) |
Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | 2 AM | 3 AM | |
| Last 24hr | -- | W | W | W G6 | SW | SW G4 | W | NE G4 | NE G5 | W | W G6 | SW G4 | W | SW | SW | -- | SW | SW | SW | SW | SW | S | S | SW |
| 1 day ago | W | SW | -- | S | W | S G5 | SE | E G10 | SE G12 | E G13 | SE G12 | SE G12 | SE G10 | SE G8 | SE G8 | SE | S | SW G4 | -- | SW | SW | W G7 | S G5 | SW |
| 2 days ago | -- | SW | S | -- | E G9 | E G13 | E | NE G10 | N | NE | NE | NE G9 | NE | E G12 | NE G5 | W | W | SW | NE | W | SW G6 | SW G5 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Hilo, Hilo International Airport, HI | 84 mi | 54 min | WSW 4 | 10.00 mi | Mostly Cloudy | 72°F | 68°F | 87% | 1016.6 hPa |
Wind History from HTO (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | 3 AM | |
| Last 24hr | SW | SW | W | W | SW | SW | SW | Calm | NE | Calm | W | W | W | S | SW | SW | SW | Calm | W | Calm | W | SW | SW | SW |
| 1 day ago | W | W | SW | SW | SW | Calm | S | SE | E | SE | E | E | E | SE | SE | SE | S | SE | S | S | SW | W | SW | W |
| 2 days ago | SW | SW | W | SW | W | S | Calm | E | E | NE | NE | NE | NE | NE | N | NE | NE | Calm | W | SW | Calm | Calm | W | SW |
Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
EDIT Weekend mode (on/off) (on/off) Help One Week of DataTide / Current data from XTide NOT FOR NAVIGATION
Tide / Current Tables for Hana, Maui Island, Hawaii
EDIT (on/off) Help One Week of DataHana
Click for Map
Tue -- 01:35 AM HST 0.25 feet Low Tide
Tue -- 05:54 AM HST Sunrise
Tue -- 08:23 AM HST 1.63 feet High Tide
Tue -- 11:34 AM HST Moonset
Tue -- 01:05 PM HST 0.80 feet Low Tide
Tue -- 07:05 PM HST Sunset
Tue -- 07:09 PM HST 1.87 feet High Tide
Tue -- 11:46 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:35 AM HST 0.25 feet Low Tide
Tue -- 05:54 AM HST Sunrise
Tue -- 08:23 AM HST 1.63 feet High Tide
Tue -- 11:34 AM HST Moonset
Tue -- 01:05 PM HST 0.80 feet Low Tide
Tue -- 07:05 PM HST Sunset
Tue -- 07:09 PM HST 1.87 feet High Tide
Tue -- 11:46 PM HST Moonrise
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 |
| 0.5 | 0.3 | 0.3 | 0.4 | 0.7 | 1 | 1.3 | 1.5 | 1.6 | 1.6 | 1.4 | 1.1 | 0.9 | 0.8 | 0.8 | 1 | 1.3 | 1.5 | 1.8 | 1.9 | 1.8 | 1.6 | 1.3 | 1 |
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 (9,2,3,4)
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Ground Weather Radar Station Kohala, 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. |