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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 6:00AM | Sunset 6:48PM | Saturday August 17, 2019 4:24 AM HST (14:24 UTC) | Moonrise 8:34PM | Moonset 7:50AM | Illumination 96% |  |
PHZ122 Big Island Windward Waters- 335 Am Hst Sat Aug 17 2019
Today..East winds 20 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Sunday..Northeast winds 15 knots. Wind waves 5 feet. Isolated showers.
Sunday night..Northeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 4 feet. South swell 3 feet in the afternoon. Isolated showers.
Monday night..East winds 15 knots. Wind waves 3 feet. South swell 3 feet increasing to 5 feet after midnight. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 15 knots. Wind waves 3 feet. South swell 4 to 5 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 4 to 6 feet. South swell 4 feet. Scattered showers.
Today..East winds 20 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Sunday..Northeast winds 15 knots. Wind waves 5 feet. Isolated showers.
Sunday night..Northeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 4 feet. South swell 3 feet in the afternoon. Isolated showers.
Monday night..East winds 15 knots. Wind waves 3 feet. South swell 3 feet increasing to 5 feet after midnight. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 15 knots. Wind waves 3 feet. South swell 4 to 5 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 4 to 6 feet. South swell 4 feet. Scattered showers.
PHZ100 335 Am Hst Sat Aug 17 2019
Synopsis for hawaiian coastal waters.. A surface high pressure system far northeast of the islands will weaken from this weekend into early next week. A new surface high is forecast to build far north of the state by the middle of next week.
Synopsis for hawaiian coastal waters.. A surface high pressure system far northeast of the islands will weaken from this weekend into early next week. A new surface high is forecast to build far north of the state by the middle of next week.
7 Day Forecast for Marine Location Near Hilo, HI
Hourly EDIT Helplocation: 19.72, -155.08 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 171415 afdhfo area forecast discussion national weather service honolulu hi 415 am hst Sat aug 17 2019 Synopsis A surface ridge north of the islands will maintain moderate trade winds through today. Winds will decrease Sunday and Monday, with an uptick expected for the middle of next week. Increased shower activity and muggy conditions are expected starting late Tuesday through Thursday. Discussion There is little or no change in forecast philosophy since last evening. A 1029 mb high near 38n143w, far northeast of the main hawaiian islands, along with an associated ridge extending through 30n150w and 26n170w, continues to drive moderate trade winds across the area this morning. High clouds along the southern flank of an upper trough cover skies above the big island, while low clouds brought in by the trades continue to concentrate along windward and mauka sections of all the islands. Radar shows scattered to numerous moderate showers embedded within trade flow also favoring windward and mauka areas. Models show the upper trough will move east over the next day or so, likely causing the high clouds to shift east of the state by Sunday. The high will shift eastward over the next few days, causing the ridge to our north to elongate and weaken. As a result, trade winds will decrease today through early next week. By late Wednesday, another high will build in from the northwest, allowing trade winds to increase from midweek into next weekend. Models show a weak trough will move past the islands around midweek, likely bumping up available moisture for showers. Details concerning how much moisture will be available and how far up the island chain the additional showers will develop remain to be worked out. No strong upper trough is expected during this time, so at this point we are only forecasting an increase in trade shower coverage from midweek onward. Aviation High pressure northeast of the state will keep moderate to locally breezy trade winds in place through tonight. Low clouds and showers will favor windward and mauka areas, bringing occasional MVFR CIGS vsbys. Showers will be most prevalent during the pre-dawn and early morning hours, with improving conditions |
expected by mid-morning. Airmet sierra is in effect for mountain obscuration across windward sections of oahu, molokai, maui and the big island. These conditions are expected to improve by mid-morning. Marine A surface high pressure system far northeast of the state will gradually weaken this weekend, which will cause the trade winds to diminish slightly through early next week. Therefore, the small craft advisory (sca), which was in effect over the typically windier waters adjacent to the islands of maui county and the big island, has been cancelled this morning. A new surface high pressure system building far north of the state by the middle of next week is expected to cause the trade winds to gradually strengthen starting next Wednesday. Small south and southwest swells will maintain background summertime surf along south facing shores this weekend. A large, long-period south-southwest swell arriving Monday is expected to peak Tuesday, then gradually lower through the rest of next week. Surf heights are expected to reach the high surf advisory (hsa) criteria along south facing shores from Monday night through Tuesday. The current west swell produced by tropical cyclones in the northwest pacific will continue to slowly decline through Monday. Surf heights produced by this lingering swell will be largest along shorelines with a westerly exposure. A small northwest swell will be possible from next Thursday through Friday. Modest surf will persist along east facing shores today, then will slowly subside from Sunday through early next week as the trade winds weaken. For additional details on swells and surf, please see the latest collaborative nearshore swell and wind forecast for oahu (srdhfo) product. Hfo watches warnings advisories None. Discussion... Powell aviation... Jelsema marine... Houston |
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 | 1 mi | 54 min | WSW 2.9 G 5.1 | 74°F | 82°F | 1017 hPa | ||
| 51206 | 7 mi | 38 min | 81°F | 7 ft | ||||
| KWHH1 | 45 mi | 60 min | NE 2.9 G 4.1 | 80°F | 84°F | 1015.8 hPa |
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 | SW G7 | W | SE | SW G8 | W | -- | SE | E G10 | E G10 | E G10 | NE G11 | SE G8 | SE G7 | E G7 | S G6 | SE | S G4 | W | SW | W G8 | S G6 | SE | W | SW |
| 1 day ago | SW | SW | S | SW | W G6 | SE G9 | SE G8 | E G10 | SE G10 | E G10 | E G10 | E G9 | NE | NE | NE G6 | W | W G4 | SW | SW | SW | S | SW | SE G8 | SW G4 |
| 2 days ago | SW | S | SW | SE | NW | E G10 | W | SE G9 | SE G13 | SE G17 | SE G16 | SE G10 | SE | SE | S | -- | SW | SW | SW | S | S | SW | SW |
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 |
| Hilo, Hilo International Airport, HI | 1 mi | 31 min | W 4 | 10.00 mi | Light Rain Fog/Mist | 78°F | 71°F | 79% | 1017.1 hPa |
Link to 5 minute data for PHTO
Wind History from HTO (wind in knots)
| 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 | 4 AM | |
| Last 24hr | Calm | SW | SW | SW | SE | E | E | E | E | SE | E | SE | SW | SW | SW | W | SW | W | W | |||||
| 1 day ago | SW | SW | SW | W | E | SE | SE | E | E | NE | NE | Calm | W | W | SW | SW | SW | SW | ||||||
| 2 days ago | SW | SW | SW | E | W | SE | S | SE | SE | SE G23 | E | E | E | E | S | SW | SW | SW | Calm | SW | S | SW | W | Calm |
Tide / Current Tables for Hilo, Hawaii Island, Hawaii
EDIT Weekend mode (on/off) (on/off) Help One Week of DataHilo
Click for Map
Sat -- 04:05 AM HST 1.66 feet High Tide
Sat -- 06:00 AM HST Sunrise
Sat -- 07:50 AM HST Moonset
Sat -- 09:39 AM HST 0.40 feet Low Tide
Sat -- 04:22 PM HST 2.48 feet High Tide
Sat -- 06:47 PM HST Sunset
Sat -- 08:33 PM HST Moonrise
Sat -- 11:14 PM HST 0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 04:05 AM HST 1.66 feet High Tide
Sat -- 06:00 AM HST Sunrise
Sat -- 07:50 AM HST Moonset
Sat -- 09:39 AM HST 0.40 feet Low Tide
Sat -- 04:22 PM HST 2.48 feet High Tide
Sat -- 06:47 PM HST Sunset
Sat -- 08:33 PM HST Moonrise
Sat -- 11:14 PM HST 0.44 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 |
| 0.6 | 0.9 | 1.3 | 1.5 | 1.7 | 1.6 | 1.3 | 1 | 0.7 | 0.4 | 0.4 | 0.6 | 0.9 | 1.4 | 1.9 | 2.3 | 2.5 | 2.4 | 2.2 | 1.8 | 1.3 | 0.9 | 0.6 | 0.4 |
Tide / Current Tables for Kawaihae, Big Island, Hawaii (2)
EDIT (on/off) Help One Week of DataKawaihae
Click for Map
Sat -- 05:05 AM HST 1.16 feet High Tide
Sat -- 06:03 AM HST Sunrise
Sat -- 07:53 AM HST Moonset
Sat -- 10:35 AM HST 0.30 feet Low Tide
Sat -- 05:22 PM HST 1.98 feet High Tide
Sat -- 06:50 PM HST Sunset
Sat -- 08:37 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 05:05 AM HST 1.16 feet High Tide
Sat -- 06:03 AM HST Sunrise
Sat -- 07:53 AM HST Moonset
Sat -- 10:35 AM HST 0.30 feet Low Tide
Sat -- 05:22 PM HST 1.98 feet High Tide
Sat -- 06:50 PM HST Sunset
Sat -- 08:37 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 |
| 0.3 | 0.4 | 0.7 | 0.9 | 1.1 | 1.2 | 1.1 | 0.9 | 0.7 | 0.5 | 0.3 | 0.3 | 0.5 | 0.7 | 1.1 | 1.5 | 1.8 | 2 | 1.9 | 1.8 | 1.4 | 1 | 0.7 | 0.4 |
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 (10,2,3,4)
(on/off) Help
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. |