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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 6:46PM | Tuesday August 20, 2019 10:18 PM HST (08:18 UTC) | Moonrise 10:15PM | Moonset 10:12AM | Illumination 68% |  |
PHZ122 Big Island Windward Waters- 925 Pm Hst Tue Aug 20 2019
Rest of tonight..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday night..Northeast winds 20 knots. Wind waves 5 feet. South swell 4 feet. Scattered showers in the evening, then isolated showers after midnight.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 4 feet and northwest 3 feet. Isolated showers through the day.
Thursday night..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 3 feet and northwest 3 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 feet. SWell northwest 3 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 6 feet. SWell northwest 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 to 7 feet. SWell northwest 3 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 7 feet. Scattered showers.
Rest of tonight..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday night..Northeast winds 20 knots. Wind waves 5 feet. South swell 4 feet. Scattered showers in the evening, then isolated showers after midnight.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 4 feet and northwest 3 feet. Isolated showers through the day.
Thursday night..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 3 feet and northwest 3 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 feet. SWell northwest 3 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 6 feet. SWell northwest 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 to 7 feet. SWell northwest 3 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 7 feet. Scattered showers.
PHZ100 925 Pm Hst Tue Aug 20 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend.
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend.
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 210628 afdhfo area forecast discussion national weather service honolulu hi 828 pm hst Tue aug 20 2019 Synopsis A surface ridge north of the area will maintain locally breezy trade winds over the islands. Expect showers to remain focused over windward and mountain areas. Discussion No changes to the forecast expected this evening. A surface ridge north of the islands will maintain a moderate to locally breezy trade wind pattern over the islands. A weakening trough south of the big island continues on its westward trek. This trough is partly responsible for the increase in moisture, particularly over the southern end of the state. Satellite derived precipitable water (pw) shows lower values should start filtering into the islands later tonight. As a result, shower activity over windward maui and the big island should be on the decrease overnight. The trade winds are expected to increase a bit more tomorrow (Wednesday) as the high associated with the ridge continues to build. The models remain in good agreement with a front far north of the islands moving southward through Thursday. This will help to disrupt the trade wind flow a bit during the second half of the week. The front will move to the west at the end of the week, and trade winds will rebound for the weekend. The bulk of the moisture associated with this front is expected to remain to the north of the islands, however some increase in shower activity is possible over kauai Friday. Aviation A moderate to locally strong trade wind regime will continue into Wednesday. Most of the cloudiness lies over the alenuihaha channel, the waters off the NE facing big island coast, and over the lee areas of the big island. Otherwise, skies are fair with minimal shower activity. Cloud bases are estimated above 3k feet with tops at 6k feet but as high as 9k feet with the showers. Although there are minimal showers now, we anticipate an increase overnight, not enough to warrant an airmet sierra, though. But will bring some brief periods of MVFR ceilings and vis to especially the windward and mountain areas. A few late night |
showers may also develop along the kona coast as well. Otherwise, vfr conditions will prevail overnight and into Wednesday morning. Airmet tango is not in effect as conditions are marginal at best for low level turb, which should hold through Wednesday. But we will monitor the situation closely and issue it if needed. Marine High pressure building northwest of the state will keep a moderate to locally strong trade wind flow in place over the next couple days. As a result, a small craft advisory (sca) remains in effect for the typically windy waters around maui and the big island. A front dropping southward and closer to the island chain late in the week, will ease the trade winds slightly Thursday night through Friday night. A new high building northeast of the islands will then strengthen the trades back to moderate and locally fresh levels over the weekend, with scas likely being required once again for the windier marine zones. The current south swell will peak tonight, then gradually lower late Wednesday into the weekend. A high surf advisory remains in effect for south facing shores of all islands through 6 am Thursday. A series of small long-period south and southwest swells will move through Sunday through early next week. A larger southwest swell is possible Tuesday through the middle of next week. Small northwest swells will linger over the next few days providing some out of season surf along north facing shores. Strengthening trade winds will give a boost in short period choppy surf along east facing shores through Wednesday night and again over the weekend. Hfo watches warnings advisories High surf advisory until 6 am hst Thursday for niihau-kauai windward-kauai leeward-oahu south shore-waianae coast-molokai leeward-lanai makai-kahoolawe-maui leeward west-maui central valley-leeward haleakala-kona-south big island-big island north and east. Small craft advisory until 6 pm hst Thursday for maalaea bay- pailolo channel-alenuihaha channel-big island leeward waters-big island southeast waters. Discussion... M ballard aviation... H lau marine... Jelsema |
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 | 49 min | WSW 1.9 G 2.9 | 75°F | 83°F | 1017.2 hPa |
Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots) EDIT (on/off) Help| 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 | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
| Last 24hr | W G6 | W | SW | SE | SW G5 | W G8 | NW | S | S G5 | SW | SW G6 | N | N | NE | NE | NE | NE | NW | NE | N | NW | NE G10 | W | SW |
| 1 day ago | SW | SW | S G4 | SW | SW | SW | SW | SW | S | SW | W | N | N | NE G13 | N | NE G8 | NE G8 | NE G9 | N | N | N | N | NW | SW |
| 2 days ago | SW | SW | SW | SW G4 | W | NW | N | N | NE | NE | NE | NE | NE | NE | N | W | W |
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 | 84 mi | 26 min | W 4 | 10.00 mi | Overcast | 78°F | 72°F | 82% | 1017.6 hPa |
Link to 5 minute data for PHTO
Wind History from HTO (wind in knots)
| 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 | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | |
| Last 24hr | W | W | E | S | SW | Calm | W | SW | SW | W | NW | N | E | W | N | NE | N | N | SE | N | Calm | SW | ||
| 1 day ago | SW | Calm | SW | SW | SW | SW | SW | SW | SW | Calm | N | N | NE | N | N | NE | NE | N | N | N | N | NW | Calm | |
| 2 days ago | SW | W | Calm | SW | S | S | SW | SW | S | SW | Calm | NW | N | NE | NE | NE | NE | N | NW | W | W |
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
Wed -- 12:16 AM HST 0.36 feet Low Tide
Wed -- 06:04 AM HST Sunrise
Wed -- 07:16 AM HST 1.93 feet High Tide
Wed -- 11:09 AM HST Moonset
Wed -- 12:55 PM HST 0.85 feet Low Tide
Wed -- 06:19 PM HST 1.77 feet High Tide
Wed -- 06:49 PM HST Sunset
Wed -- 10:58 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:16 AM HST 0.36 feet Low Tide
Wed -- 06:04 AM HST Sunrise
Wed -- 07:16 AM HST 1.93 feet High Tide
Wed -- 11:09 AM HST Moonset
Wed -- 12:55 PM HST 0.85 feet Low Tide
Wed -- 06:19 PM HST 1.77 feet High Tide
Wed -- 06:49 PM HST Sunset
Wed -- 10:58 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 |
| 0.4 | 0.4 | 0.6 | 0.9 | 1.3 | 1.6 | 1.8 | 1.9 | 1.9 | 1.7 | 1.4 | 1.1 | 0.9 | 0.8 | 0.9 | 1.1 | 1.4 | 1.6 | 1.8 | 1.7 | 1.6 | 1.3 | 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 (4,6,7,8)
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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. |