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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 6:08AM | Sunset 6:15PM | Saturday September 23, 2017 2:49 AM HST (12:49 UTC) | Moonrise 9:14AM | Moonset 9:01PM | Illumination 8% |  |
Marine Forecasts
EDIT (on/off) Help| PHZ122 Big Island Windward Waters- 901 Pm Hst Fri Sep 22 2017 Rest of tonight..East winds 15 knots. Wind waves 4 feet. Mixed swell northwest 3 feet and southeast 3 feet. Isolated showers. Saturday..East winds 15 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the morning. Saturday night..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers. Sunday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet in the morning. Isolated showers in the morning. Sunday night..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet after midnight. Scattered showers. Monday..East winds 10 knots. Wind waves 3 feet. Isolated showers. Monday night..East winds 10 knots. Wind waves 3 feet. Isolated showers in the evening, then scattered showers after midnight. Tuesday..East winds 10 knots. Wind waves 3 to 4 feet. Scattered showers. Wednesday..Northeast winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Scattered showers. | PHZ100 901 Pm Hst Fri Sep 22 2017 Synopsis for hawaiian coastal waters.. A ridge of high pressure far north of the state will slowly weaken through tonight. The ridge will move closer to the island chain over the weekend as a cold front passes to the north. |
7 Day Forecast for Marine Location Near Nanawale Estates, HI
Hourly EDIT Helplocation: 19.49, -154.81 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 230626 afdhfo area forecast discussion national weather service honolulu hi 826 pm hst Fri sep 22 2017 Synopsis Trade winds will gradually trend down over the weekend as a ridge of high pressure to the north weakens and a weak surface trough slowly approaches from the east. Mainly windward clouds with light passing showers will prevail into early next week, with a possible boost in shower activity around the middle of next week as the surface trough moves through the islands. Discussion Currently at the surface, a 1027 mb high is centered around 1725 miles north-northeast of honolulu, and is driving moderate trade winds across the island chain this evening. Meanwhile, a weak surface trough is located around 550 miles northeast of hilo. Infrared satellite imagery shows clear to partly cloudy skies in place across the state, with some thin cirrus also moving over the big island. Radar imagery shows scattered light showers moving into windward areas, with a few lingering showers also over leeward sections of the big island. Elsewhere predominantly rain free conditions prevail. Main short term concerns revolve around the diminishing trades and rain chances over the next couple of days. Tonight through Tuesday, high pressure will weaken and shift eastward as the weak surface trough northeast of the state shifts slowly westward toward the island chain. This will result in a gradual easing of the trade winds over the weekend, with light to locally moderate trades expected for the first half of next week. Showers will continue to favor windward and mauka areas through the period, although some leeward shower development will be possible each day due to the weakened trades. Overall, fairly dry conditions are expected through the period given precipitable waters values in the 1.0 to 1.3 inch range, well below climatological norms for this time of year. |
Tuesday night through next Thursday, the surface trough will shift westward across the island chain during the middle of next week, and this should bring an increase in shower activity, as well as increasing the trade wind flow back to moderate levels. Showers will continue to favor windward and mauka areas through the period. Aviation Except for the chance of brief MVFR conditions in passing showers over windward and mauka sections across the island chain, and tempo lower ceilings over leeward sections of the big island tonight;VFR will predominate through Saturday. Airmet tango remains in effect for low level turbulence over and downwind of the mountains on all islands. This airmet will likely be cancelled by midnight as the trade winds trend down. Marine Winds have decreased below small craft advisory (sca) threshold this evening, and the earlier SCA for waters around maui and the big island has been cancelled. Surf along south facing shores will remain small through early next week, with mainly background southeast and southwest swell energy expected. The next potential long-period pulse out of the southwest from the tasman sea is expected by Sunday and could lead to a slight increase in surf. For the extended forecast, strong to gale-force southwest winds associated with a low in the tasman sea may lead to another small southwest swell Tuesday through midweek. A small northwest swell will continue into the weekend before easing. Another small reinforcement from that direction is expected to fill in around Sunday night through the middle of next week. Hfo watches warnings advisories None. Discussion... Jelsema aviation... Kinel 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 |
| ILOH1 - 1617760 - Hilo, HI | 21 mi | 50 min | SW 2.9 G 5.1 | 71°F | 81°F | 1014.7 hPa (-1.2) | ||
| 51206 | 22 mi | 53 min | 81°F | 5 ft |
Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | SW | SW | SW | S | SW | SW | W | N | N | NE G8 | NE G9 | NE | NE G9 | NE | NE | NE | -- | SW | SW | SW | SW | SW | SW | SW |
| 1 day ago | SW | SW | NW | SW | SW G7 | NW | NE | NW | NW | NW | N G8 | NE G14 | NE G12 | NE G11 | NE | NE | W | S | W | SW | W | SW | W | SW G8 |
| 2 days ago | W | W | W | W G11 | W | W | W G11 | W | NW G5 | N | W | W | W | W | W | W | SW | W | -- | SW | S | SW |
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 | 21 mi | 57 min | WSW 6 | 10.00 mi | Fair | 68°F | 63°F | 84% | 1014.9 hPa |
Wind History from HTO (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | SW | SW | SW | SW | SW | SW | N | Calm | N | NE | NE | NE | NE | NE | NE | Calm | Calm | SW | SW | SW | SW | SW | SW | SW |
| 1 day ago | SW | SW | NW | SE | SW | NW | Calm | NW | NW | NE | NW | NE | NE | NE | NE | NE | N | Calm | SW | SW | SW | SW | W | SW |
| 2 days ago | SW | W | W | W | Calm | W | S | W | W | W | W | NW | Calm | W | Calm | Calm | SW | SW | W | SW | SW | SW | SW | W |
Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Hilo Click for Map Sat -- 05:01 AM HST 2.35 feet High Tide Sat -- 06:09 AM HST Sunrise Sat -- 09:15 AM HST Moonrise Sat -- 11:06 AM HST 0.67 feet Low Tide Sat -- 04:42 PM HST 1.93 feet High Tide Sat -- 06:15 PM HST Sunset Sat -- 09:01 PM HST Moonset Sat -- 10:58 PM HST 0.22 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.4 | 0.9 | 1.4 | 1.9 | 2.2 | 2.3 | 2.2 | 1.9 | 1.5 | 1.1 | 0.8 | 0.7 | 0.7 | 1 | 1.3 | 1.7 | 1.9 | 1.9 | 1.8 | 1.4 | 1 | 0.6 | 0.3 | 0.2 |
Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
EDIT (on/off) Help One Week of Data| Honuapo Click for Map Sat -- 05:39 AM HST 2.37 feet High Tide Sat -- 06:11 AM HST Sunrise Sat -- 09:16 AM HST Moonrise Sat -- 11:39 AM HST 0.67 feet Low Tide Sat -- 05:20 PM HST 1.95 feet High Tide Sat -- 06:17 PM HST Sunset Sat -- 09:04 PM HST Moonset Sat -- 11:31 PM HST 0.22 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 0.2 | 0.6 | 1.1 | 1.6 | 2.1 | 2.3 | 2.4 | 2.2 | 1.8 | 1.3 | 1 | 0.7 | 0.7 | 0.8 | 1.1 | 1.5 | 1.8 | 1.9 | 1.9 | 1.7 | 1.3 | 0.9 | 0.5 | 0.2 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of Hawaii EDIT  |
Wind Forecast for (8,2,3,4)
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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. |