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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 5:50AM | Sunset 7:02PM | Saturday July 20, 2019 12:30 PM HST (22:30 UTC) | Moonrise 10:03PM | Moonset 9:09AM | Illumination 85% |  |
PHZ123 Big Island Leeward Waters- 949 Am Hst Sat Jul 20 2019
.small craft advisory in effect through Sunday afternoon...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. SWell southeast 3 feet. Isolated showers late in the morning.
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Scattered showers and isolated Thunderstorms through the night.
Monday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers in the morning. Isolated Thunderstorms through the day. Numerous showers in the afternoon.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. SWell southeast 3 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. SWell southeast 3 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 to 9 feet. SWell south 3 feet. Isolated showers.
.small craft advisory in effect through Sunday afternoon...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. SWell southeast 3 feet. Isolated showers late in the morning.
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 feet. SWell southeast 3 feet. Scattered showers and isolated Thunderstorms through the night.
Monday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers in the morning. Isolated Thunderstorms through the day. Numerous showers in the afternoon.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. SWell southeast 3 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. SWell southeast 3 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 to 9 feet. SWell south 3 feet. Isolated showers.
PHZ100 949 Am Hst Sat Jul 20 2019
Synopsis for hawaiian coastal waters.. High pressure will remain north to northeast of the region through the upcoming week. Weak low pressure will pass south of the state early next week.
Synopsis for hawaiian coastal waters.. High pressure will remain north to northeast of the region through the upcoming week. Weak low pressure will pass south of the state early next week.
7 Day Forecast for Marine Location Near Kalaoa, HI
Hourly EDIT Helplocation: 19.75, -156.05 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 202010 afdhfo area forecast discussion national weather service honolulu hi 1010 am hst Sat jul 20 2019 Synopsis A broad area of high pressure far north of the islands will continue to feed the islands with locally breezy trade winds through at least the middle of next week. There could be a boost in enhanced trade wind showers between Monday and Tuesday, especially the eastern end of the island chain, in association with a low level disturbance passing south of the islands and the interaction with an upper level low northwest of the islands. Discussion A well anchored surface high north of the islands will be the continuing source for trade winds for the area through at least the middle of next week. These trade winds will be mainly be in the moderate to locally strong range. There has been some late changes with what the models have instore for the islands in the next 72 hours or so. From what was a benign, uneventful, trade wind pattern, models are now suggesting a disturbance to pass south of the islands between Monday and early Tuesday time frame. The disturbance will be accompanied by tropical moisture that will sweep across the area from east to west. Further more, an upper low at 500 mb is located 355 miles north-northwest of kauai now. It is forecast to deepen slightly in the next 36 hours while remaining in that general vicinity through early Monday morning, before moving further away from the islands. By Tuesday afternoon the upper low is expected to be 700 miles west-northwest of kauai. Both the gfs, ecmwf, and nam, are in pretty good agreement with this scenario, although the ec is a few hours behind the GFS with the onset of the weather. Current grids have thunderstorms slated for the big island Monday morning, as per GFS solution. Comparing the latest satellite imagery with the models, there is a presence of low level low 460 miles south of south point, fitting the models solution. The models weakens this low to a strong trough as it pushes west- northwestward through Sunday, then northwest through Monday night, running parallel to the island chain. The upper low northwest of kauai, with its southerly winds aloft, will be helping steer the trough's course. Perhaps the question mark is how much tropical moisture will be accompanying this trough. We hope to have a clearer picture by this evening. Current grids have thunderstorms for the big island beginning Monday morning, and keeping the smaller islands out of this unsettled weather for now. With the upper low being weaker and some 900 miles away, the weather will return to regular trades by Tuesday night or Wednesday. Currently, satellite imagery shows broken low clouds coverage upwind of the islands, especially upwind of maui and the hamakua |
coast. Some dissipation is expected with these clouds, but not all. So expect some passing showers for the rest of the day, and perhaps this evening for maui. Aviation A high will remain nearly stationary far north of the main hawaiian islands and maintain locally strong east winds over the area. Airmet tango is in effect for moderate turbulence below 7,000ft and this airmet will likely continue into Sunday. The east winds will carry scattered to broken low clouds over windward areas. Later today clouds and showers will develop over the southwest slopes of the big island and maui. We expectVFR conditions to prevail and we do not expect to have to issue airmet sierra today. Marine Fresh to locally strong easterly trades are forecast to continue through next week as high pressure remains positioned north-northeast of the area. The 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 place for these areas through Sunday and will likely need to be extended into early next week. Rough surf will continue along east facing shores each day due to strong onshore winds. Heights are forecast to slightly trend down through the latter half of the weekend into early next week due to the upstream trades trending down. Surf along south facing shores will remain small through the weekend, then trend up through the first half of the upcoming week due to a recent system passing through near the tasman sea. Heights should remain below advisory levels as this south- southwest swell moves through and peaks Monday through Tuesday. In addition to this long-period source, a combination of small south to southeast swells will be enough to keep the surf from going flat along southern exposures through midweek. A south-southeast (150-160 deg) long-period swell associated with a compact gale that has developed southeast of the tuamotus will be possible late next week with a peak around Thursday night into Friday. Surf will rise along exposed shores but should remain below advisory levels. See the latest oahu surf discussion (srdhfo) for additional details on surf and swell. Hfo watches warnings advisories Small craft advisory until 6 pm hst Sunday for maalaea bay, pailolo and alenuihaha channels, and waters south of the big island. H lau donaldson kino |
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 | 23 mi | 48 min | W 8.9 G 11 | 81°F | 83°F | 1013.9 hPa | ||
| ILOH1 - 1617760 - Hilo, HI | 53 mi | 42 min | ENE 8.9 G 13 | 1015 hPa | ||||
| KLIH1 - 1615680 - Kahului Bay, Maui, HI | 82 mi | 48 min | NNE 18 G 24 | 79°F | 1015.1 hPa |
Wind History for Kawaihae, HI
(wind in knots) EDIT (on/off) Help| 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 | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
| Last 24hr | W | SW | SW | SW | SW | W | SW | W | NW G7 | NW | E G13 | SE G19 | E G16 | E G11 | NE G15 | E G26 | E G21 | E G15 | SE G18 | SE G21 | E G20 | SE G18 | SW | W |
| 1 day ago | W G17 | W G14 | W G11 | W | SW | SW | W | W | W | W | W | N G8 | N G6 | SE G16 | SE G11 | N G4 | NW | N | NE | SW | W | W | W | W |
| 2 days ago | W | W | W G10 | W | W | W | W | NE G10 | E G8 | NE | E G9 | E | NE | NE | NE | NE | NE | NW | W G13 | W | W G16 | W G16 | SW G22 | W G18 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Kailua / Kona, Keahole Airport, HI | 7 mi | 37 min | WSW 11 | 10.00 mi | Partly Cloudy | 84°F | 73°F | 72% | 1013.7 hPa |
Wind History from HKO (wind in knots)
| 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | -12 PM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
| Last 24hr | SW | SW | SW | S | S | S | SE | S | SW | N | NW | SW | SE | SW | Calm | Calm | Calm | S | SW | S | SW | SW | SW | |
| 1 day ago | S | SW | SW | SW | W | S | S | SE | SE | SE | SE | SE | SE | SE | SE | E | E | NE | S | SW | S | S | SW | SW |
| 2 days ago | W | W | S | SE | Calm | E | E | Calm | NE | Calm | NE | NE | E | N | NE | S | S | S | S | S |
Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
EDIT Weekend mode (on/off) (on/off) Help One Week of DataKailua Kona
Click for Map
Sat -- 12:56 AM HST 0.24 feet Low Tide
Sat -- 05:55 AM HST Sunrise
Sat -- 06:01 AM HST 0.93 feet High Tide
Sat -- 09:09 AM HST Moonset
Sat -- 11:03 AM HST 0.31 feet Low Tide
Sat -- 06:10 PM HST 2.02 feet High Tide
Sat -- 07:04 PM HST Sunset
Sat -- 10:02 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 12:56 AM HST 0.24 feet Low Tide
Sat -- 05:55 AM HST Sunrise
Sat -- 06:01 AM HST 0.93 feet High Tide
Sat -- 09:09 AM HST Moonset
Sat -- 11:03 AM HST 0.31 feet Low Tide
Sat -- 06:10 PM HST 2.02 feet High Tide
Sat -- 07:04 PM HST Sunset
Sat -- 10:02 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 | 0.2 | 0.3 | 0.5 | 0.7 | 0.9 | 0.9 | 0.9 | 0.7 | 0.5 | 0.4 | 0.3 | 0.4 | 0.6 | 0.9 | 1.3 | 1.6 | 1.9 | 2 | 2 | 1.7 | 1.4 | 1 | 0.7 |
Tide / Current Tables for Kailua Kona, Big Island, Hawaii
EDIT (on/off) Help One Week of DataKailua Kona
Click for Map
Sat -- 12:55 AM HST 0.24 feet Low Tide
Sat -- 05:55 AM HST Sunrise
Sat -- 06:03 AM HST 0.91 feet High Tide
Sat -- 09:09 AM HST Moonset
Sat -- 11:07 AM HST 0.33 feet Low Tide
Sat -- 06:12 PM HST 2.03 feet High Tide
Sat -- 07:04 PM HST Sunset
Sat -- 10:02 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 12:55 AM HST 0.24 feet Low Tide
Sat -- 05:55 AM HST Sunrise
Sat -- 06:03 AM HST 0.91 feet High Tide
Sat -- 09:09 AM HST Moonset
Sat -- 11:07 AM HST 0.33 feet Low Tide
Sat -- 06:12 PM HST 2.03 feet High Tide
Sat -- 07:04 PM HST Sunset
Sat -- 10:02 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 | 0.2 | 0.3 | 0.5 | 0.7 | 0.8 | 0.9 | 0.9 | 0.7 | 0.6 | 0.4 | 0.3 | 0.4 | 0.6 | 0.9 | 1.3 | 1.6 | 1.9 | 2 | 2 | 1.7 | 1.4 | 1 | 0.7 |
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 (18,4,5,8)
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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. |