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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 7:03PM | Thursday July 18, 2019 6:38 PM HST (04:38 UTC) | Moonrise 8:47PM | Moonset 7:29AM | Illumination 96% |  |
PHZ123 Big Island Leeward Waters- 332 Pm Hst Thu Jul 18 2019
.small craft advisory in effect through Sunday afternoon...
Tonight..West of the big island, winds variable less than 10 knots becoming east 10 knots after midnight. NEar south point, east winds to 30 knots. Wind waves 10 feet. SWell southeast 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Friday..West of the big island, southeast winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 11 feet. SWell southeast 3 feet. Isolated showers in the morning.
Friday night..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 through the night.
Saturday..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.
Saturday night..West of the big island, east winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. 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 7 feet. Isolated showers in the morning.
Sunday night..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.
Monday..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 showers.
Tuesday..West of the big island, west winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 5 to 6 feet. SWell southeast 3 feet. Isolated showers.
.small craft advisory in effect through Sunday afternoon...
Tonight..West of the big island, winds variable less than 10 knots becoming east 10 knots after midnight. NEar south point, east winds to 30 knots. Wind waves 10 feet. SWell southeast 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Friday..West of the big island, southeast winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 11 feet. SWell southeast 3 feet. Isolated showers in the morning.
Friday night..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 through the night.
Saturday..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.
Saturday night..West of the big island, east winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. 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 7 feet. Isolated showers in the morning.
Sunday night..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.
Monday..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 showers.
Tuesday..West of the big island, west winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 5 to 6 feet. SWell southeast 3 feet. Isolated showers.
PHZ100 332 Pm Hst Thu Jul 18 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain fresh to strong trades through Friday, then ease over the weekend as the high weakens. High pressure is expected to persist north of the state through early next week.
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain fresh to strong trades through Friday, then ease over the weekend as the high weakens. High pressure is expected to persist north of the state through early next week.
7 Day Forecast for Marine Location Near Holualoa, HI
Hourly EDIT Helplocation: 19.65, -156 debug
Area Discussion for -
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxhw60 phfo 190126 cca afdhfo area forecast discussion national weather service honolulu hi 325 pm hst Thu jul 18 2019 Synopsis High pressure far to the north will provide trade winds into next week, with wind speeds easing somewhat over the weekend. Clouds and showers riding in with the trades will favor windward and mountain areas, with showers most frequent during nights and mornings. An area of especially showery clouds will arrive overnight, bringing showers to many windward communities before departing Friday. A few light showers may briefly spread to otherwise dry leeward areas, with the exception being leeward big island, where clouds and a few showers are expected each afternoon and evening. Discussion High pressure will remain entrenched far N and NE of the islands over the next week, supporting a seasonable trade wind weather pattern. The high will support locally strong ene trade winds initially, with wind speeds easing slightly by Saturday as it weakens a little. With trade winds blowing, clouds and showers will focus over windward areas, but a few brief showers will spread leeward on the smaller islands. On the big island, this is the wet season for the leeward slopes, where afternoon and evening clouds can be expected (nearly daily) to drop a few showers. Having said that, today has been a bit of an exception, with only patchy cloudiness noted. The leading edge of an area of open-celled showery cumulus clouds is moving in to windward big island and maui from the e, and will bring a statewide increase in windward cloud and shower coverage overnight, especially as compared to the current mostly dry conditions. A few showers will spread leeward with the gusty trade winds, but accumulations in general will be limited as models depict this moisture moving W of the islands on Friday, and because the low- levels will be capped at about 7000 feet. Latest goes-17 satellite imagery reinforces this notion, as the incoming showery low cloud field transitions to a more stable cloud field in an area about 300 to 800 miles E and NE of the islands. About 800-1000 miles to the E and ne, the cloud field becomes more showery, with GFS indicating these clouds leading to an increase in low-level moisture that arrives on Saturday. Hard to bank on the details of that verifying, with the general expectation being that the trade winds will deliver periods of clouds and showers to windward areas, especially during nights and mornings. Generally speaking, the pattern aloft will feature low pressure to the NW and a ridge to the se, with the low acting to occasionally spread high clouds of varying thicknesses over the islands. Currently, water vapor imagery shows a weak low aloft centered about 400 miles N of the islands, with an associated e-w oriented trough. Afternoon soundings indicate that this feature is promoting instability above a strong low-level subsidence inversion based near 7000 feet, with the unstable layer starting at 12000 feet on kauai. With the unstable layer based near 15000 feet on the big island, |
surface-based air parcels are not expected to be able to tap into the instability, and upslope convection is not expected, even as the trough aloft becomes n-s oriented over the area over the weekend. With the low-level inversion remaining in place, rainfall amounts will be limited, even as showery patches move through with the trade winds. Aviation A high will remain nearly stationary far northeast of the main hawaiian islands and maintain locally strong east winds over the islands through Friday. Airmet tango is in effect for moderate turbulence below 7,000ft and this airmet will likely continue into Friday. The low level winds will carry some clouds and showers over east sections of the islands. An area of broken low clouds moving over the islands from the east has produced an increase in cloud cover over east sections of the big island of hawaii and east maui but little in the way of low ceilings or visibilities. These clouds may become more active this evening and produce localized MVFR conditions over east sections of the islands. Airmet sierra for mtn obsc could be required. The area of showery low clouds should clear the islands Friday afternoon. Marine High pressure north of the state will maintain fresh to strong trade winds through Friday. The high is expected to weaken some over the weekend, which will help the winds ease slightly. Trade winds may drop to moderate to fresh speeds early next week for a brief day or two. The small craft advisory (sca) continues through Friday afternoon for all waters in response to the trade winds. The forecast calls for the winds to start to weaken Friday night, which will drop the sca back to the typical windier areas around maui and the big island for the weekend. Rough and choppy surf is expected to hold steady along east facing shores at heights just below the advisory threshold through Friday. As the winds ease over the weekend, surf is expected to drop slightly. Some small background south and southwest swells are expected through the weekend. An increase in surf along south facing shores is possible early next week as a couple small southwest swells arrive in the islands. Hfo watches warnings advisories Small craft advisory until 6 pm hst Sunday for maalaea bay-pailolo channel-alenuihaha channel-big island leeward waters-big island southeast waters. Small craft advisory until 6 pm hst Friday for kauai northwest waters-kauai windward waters-kauai leeward waters-kauai channel-oahu windward waters-oahu leeward waters-kaiwi channel-maui county windward waters-maui county leeward waters-big island windward waters. Discussion... Birchard aviation... Donaldson marine... 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 | 28 mi | 56 min | WSW 8.9 G 9.9 | 82°F | 83°F | 1013.6 hPa | ||
| ILOH1 - 1617760 - Hilo, HI | 50 mi | 50 min | Calm G 1.9 | 76°F | 81°F | 1015.5 hPa | ||
| KLIH1 - 1615680 - Kahului Bay, Maui, HI | 90 mi | 56 min | NE 15 G 18 | 78°F | 1015.4 hPa |
Wind History for Kawaihae, HI
(wind in knots) EDIT (on/off) Help| 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 | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | 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 | W G17 | W G14 | W G11 | W | SW | SW |
| 1 day ago | W | NW | NW G8 | NW | E G17 | SE G15 | E G20 | E G16 | SE | NE | NE | E G10 | N G9 | NW | SW G5 | NW G21 | W | W | W | W | W G10 | W | W | W |
| 2 days ago | NE | NE | NE | SW | W | W | W | W | W | SW | SW | SW | SW | 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 |
| Kailua / Kona, Keahole Airport, HI | 0 mi | 45 min | WSW 8 | 10.00 mi | Mostly Cloudy | 83°F | 72°F | 70% | 1013.7 hPa |
Wind History from HKO (wind in knots)
| 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 | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | SE | Calm | E | E | Calm | NE | Calm | NE | NE | E | N | NE | S | S | S | S | S | S | SW | SW | SW | W | ||
| 1 day ago | SW | S | SW | SW | S | S | SE | W | W | W | SW | W | W | S | ||||||||||
| 2 days ago | S | SW | S | NE | NE | NE | N | NE | NE | NE G22 | NE | E | NE | S | W | W | SW | W | W | W | W | W | W | SW |
Tide / Current Tables for Kailua Kona, Big Island, Hawaii
EDIT Weekend mode (on/off) (on/off) Help One Week of DataKailua Kona
Click for Map
Fri -- 12:22 AM HST 0.25 feet Low Tide
Fri -- 05:15 AM HST 0.86 feet High Tide
Fri -- 05:55 AM HST Sunrise
Fri -- 08:20 AM HST Moonset
Fri -- 10:26 AM HST 0.20 feet Low Tide
Fri -- 05:39 PM HST 2.16 feet High Tide
Fri -- 07:05 PM HST Sunset
Fri -- 09:25 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:22 AM HST 0.25 feet Low Tide
Fri -- 05:15 AM HST 0.86 feet High Tide
Fri -- 05:55 AM HST Sunrise
Fri -- 08:20 AM HST Moonset
Fri -- 10:26 AM HST 0.20 feet Low Tide
Fri -- 05:39 PM HST 2.16 feet High Tide
Fri -- 07:05 PM HST Sunset
Fri -- 09:25 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 | 0.3 | 0.4 | 0.6 | 0.8 | 0.9 | 0.8 | 0.7 | 0.5 | 0.3 | 0.2 | 0.2 | 0.4 | 0.7 | 1.1 | 1.5 | 1.9 | 2.1 | 2.2 | 2 | 1.7 | 1.3 | 0.9 | 0.5 |
Tide / Current Tables for Kawaihae, Big Island, Hawaii
EDIT (on/off) Help One Week of DataKawaihae
Click for Map
Fri -- 12:34 AM HST 0.16 feet Low Tide
Fri -- 05:40 AM HST 0.94 feet High Tide
Fri -- 05:53 AM HST Sunrise
Fri -- 08:18 AM HST Moonset
Fri -- 10:53 AM HST 0.12 feet Low Tide
Fri -- 06:01 PM HST 2.30 feet High Tide
Fri -- 07:05 PM HST Sunset
Fri -- 09:25 PM HST Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:34 AM HST 0.16 feet Low Tide
Fri -- 05:40 AM HST 0.94 feet High Tide
Fri -- 05:53 AM HST Sunrise
Fri -- 08:18 AM HST Moonset
Fri -- 10:53 AM HST 0.12 feet Low Tide
Fri -- 06:01 PM HST 2.30 feet High Tide
Fri -- 07:05 PM HST Sunset
Fri -- 09:25 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 |
| 0.2 | 0.2 | 0.3 | 0.5 | 0.8 | 0.9 | 0.9 | 0.8 | 0.6 | 0.4 | 0.2 | 0.1 | 0.2 | 0.5 | 0.9 | 1.4 | 1.9 | 2.2 | 2.3 | 2.2 | 1.9 | 1.5 | 1 | 0.6 |
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 (0,6,7,8)
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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. |