Thursday, July2, 2020
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Marine Weather and Tides
Holualoa, HI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 5:44AMSunset 7:04PM Thursday July 2, 2020 11:53 AM HST (21:53 UTC) Moonrise 5:06PMMoonset 3:33AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PHZ123 Big Island Leeward Waters- 946 Am Hst Thu Jul 2 2020
Rest of today..West winds 10 knots west of the big island... East 20 knots near south point. Wind waves 6 feet. Isolated showers late in the morning.
Tonight..West of the big island, winds variable less than 10 knots becoming north 10 knots after midnight. NEar south point, east winds 15 knots. Wind waves 5 feet. Isolated showers.
Friday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 3 feet. Isolated showers through the day.
Friday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Scattered showers in the evening, then isolated showers after midnight.
Saturday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Saturday night..West of the big island, winds variable less than 10 knots becoming southeast 10 knots after midnight. NEar south point, east winds 15 knots. Wind waves 4 feet. Scattered showers.
Sunday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. SWell south 3 feet. Isolated showers.
Monday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Isolated showers.
PHZ100 946 Am Hst Thu Jul 2 2020
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the islands will weaken slightly through the holiday weekend, then restrengthen early next week.


7 Day Forecast for Marine Location Near Holualoa, HI
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location: 19.65, -156     debug


Area Discussion for -
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FXHW60 PHFO 021958 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 958 AM HST Thu Jul 2 2020

SYNOPSIS. Light to moderate trade winds will prevail through the holiday weekend, then strengthen early next week. Clouds and brief showers will favor windward areas through the period, but an area of increased moisture moving across the islands Friday through Saturday night could potentially bring a few showers to leeward areas as well.

DISCUSSION. Trade winds will persist through the forecast period, trending down in the short term, then remaining light to moderate through the holiday weekend as a surface trough moves from E to W across the chain. Breezy to locally windy trades are expected by Tuesday as the trough moves W of the area, and high pressure to the N strengthens.

Overall, the trade winds have remained mostly dry over the past day or so, but Oahu has received the bulk of the random showery low clouds embedded in the trade flow, but 24-hour rainfall totals are all below 1/4 inch. Morning satellite images show the low-level flow near the islands has backed to the NE since yesterday, due to the approach of a low-level (1000-700 mb) trough about 275 miles E of the Big Island. Although significant changes are not expected to the trade wind supporting high to the distant NNE through the weekend, the passage of the trough across the islands will modulate wind speed and direction. These slight changes can have profound implications for the distribution of clouds and showers, but the general expectation is that they will continue to favor windward areas.

As the trough moves across (and W of) the islands, the low-level flow will moisten and veer to the E/SE and weaken Friday, persisting into Saturday. This places the smaller islands in the partial wind "shadow" of the Big Island and Maui, which can lead to shower- producing mesoscale eddies that are near impossible to forecast with any lead time/skill. Also these diminished winds will likely allow afternoon leeward sea breezes to develop, leading to some cloud buildups that could also potentially drop a few showers. With PWAT increasing to near 1.7" and the inversion height rising to near 12 thousand feet, showers are expected to increase in coverage and intensity.

More typical trade wind weather should resume Sunday through the middle of next week, with brief, less intense showers favoring windward and mauka areas. A stray shower will reach leeward sections from time to time, especially with the stronger trades expected from Tuesday onward.

AVIATION. High pressure far north of the state will allow for moderate trades to continue today, though a slight downward trend is expected over the next day or so. Areas over and south through west of the mountains could still experience periods of low-level turbulence today, so AIRMET TANGO remains in effect for areas below 7000 feet. However, if winds decrease earlier, this AIRMET may be canceled later today.

Scattered showers riding in on the trade wind flow will affect mainly windward coasts and slopes, causing brief periods of MVFR conditions, but not widespread enough for extensive mountain obscuration.

MARINE. High pressure north of the state will maintain moderate to locally fresh trades through tonight. Trade winds will begin to decrease on Friday and will remain at light to moderate levels through Monday. Winds are expected to strengthen to locally strong speeds next week Tuesday as the high strengthens north of the state.

A new south-southwest swell is starting to fill in this morning across the state. Surf along south facing shores should build through the day today and peak this afternoon or evening time frame just below advisory thresholds. This swell will gradually lower Friday through the weekend. Otherwise, a mix of small background swells from the south- southeast and south-southwest is expected through the middle of next week.

Surf along east facing shores will be decreasing Friday through the weekend as the trades weaken. Surf along north facing shores will remain nearly flat with mainly background trade wind swell.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Birchard AVIATION . TS MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 28 mi59 min WSW 8.9 G 11 79°F 81°F1014.4 hPa
ILOH1 - 1617760 - Hilo, HI 50 mi59 min NE 5.1 G 7 77°F 80°F1014.8 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi59 min NE 13 G 18 78°F 81°F1016.1 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi60 minSW 810.00 miPartly Cloudy84°F69°F61%1014.5 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrS10S9S10S11S11S9S7S7S5NE11
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CalmSE5SE5SE5SE6SE10S7S8W7SW8
1 day agoW8SW10W9SW9SW10W10W8W8NW5NW5E13N15S3N6NE10SE6E4N6E3E4S4S7S9S10
2 days agoSW10SW8SW10S9S8S8S8S8SE8S6S5W3W6W7W7W5CalmN4N5CalmNE11NE11SW10SW9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Thu -- 12:59 AM HST     0.86 feet High Tide
Thu -- 03:32 AM HST     Moonset
Thu -- 05:49 AM HST     Sunrise
Thu -- 06:56 AM HST     -0.24 feet Low Tide
Thu -- 02:24 PM HST     2.43 feet High Tide
Thu -- 05:06 PM HST     Moonrise
Thu -- 07:06 PM HST     Sunset
Thu -- 09:37 PM HST     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.90.80.60.30.1-0.2-0.2-0.10.20.71.21.82.22.42.42.21.81.30.80.50.30.30.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 01:20 AM HST     0.97 feet High Tide
Thu -- 03:31 AM HST     Moonset
Thu -- 05:48 AM HST     Sunrise
Thu -- 07:15 AM HST     -0.25 feet Low Tide
Thu -- 02:43 PM HST     2.62 feet High Tide
Thu -- 05:06 PM HST     Moonrise
Thu -- 07:06 PM HST     Sunset
Thu -- 09:52 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.910.90.80.50.2-0.1-0.2-0.20.10.61.11.72.22.62.62.421.510.60.40.30.4

Weather Map
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wmap_P
GEOS 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 (17,4,5,8)
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Ground Weather Radar Station Kohala, HI
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weather_mapweather_map weather_map

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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 numerous 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.