Monday, July13, 2020
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Marine Weather and Tides
Captain Cook, 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 5:48AMSunset 7:04PM Monday July 13, 2020 1:03 AM HST (11:03 UTC) Moonrise 12:34AMMoonset 1:15PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 900 Pm Hst Sun Jul 12 2020
.small craft advisory in effect through Monday afternoon...
Rest of tonight..West winds 10 knots west of the big island... East to 25 knots near south point. Wind waves 7 feet. Isolated showers.
Monday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds to 25 knots. Wind waves 7 feet. Isolated showers in the morning.
Monday night..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 6 feet. Isolated showers.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. Isolated showers.
Tuesday night..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 6 feet. SWell southeast 3 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers in the afternoon.
Wednesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. SWell southeast 3 feet. Isolated showers.
Thursday..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 15 knots. Wind waves 5 feet. SWell southeast 3 feet. Isolated showers.
Friday..West of the big island, winds variable less than 10 knots becoming southwest 10 knots in the afternoon, then veering northwest. NEar south point, east winds 15 knots. Wind waves 5 feet. Isolated showers.
PHZ100 900 Pm Hst Sun Jul 12 2020
Synopsis for hawaiian coastal waters.. High pressure north-northeast of the area will keep fresh to strong trade winds in place through Monday. A couple troughs moving by north of the islands will ease the trades slightly Tuesday through Friday.


7 Day Forecast for Marine Location Near Captain Cook, HI
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location: 19.46, -155.96     debug


Area Discussion for -
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FXHW60 PHFO 130619 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 819 PM HST Sun Jul 12 2020

SYNOPSIS. A high pressure system north of the islands will keep moderate to locally breezy trade winds in the forecast through Monday. An upper level disturbance will line up with a low level trough passing from east to west across the state. Expect increasing shower activity tonight through Monday as both system move across the state. Trade winds will decrease in strength starting on Tuesday as the high pressure center drifts further north away from the Hawaiian Islands. These lighter trades will allow light sea breezes to develop over shelters leeward areas each day lasting through the end of next week. Stronger trade winds are forecast to return by Saturday.

DISCUSSION. This evenings satellite imagery shows an upper level closed low roughly 600 miles north of the Big Island drifting slowly westward along the axis of an upper level trough. The subtropical jet stream continues to spread cirrus clouds from west to east across the islands. In the lower levels clouds continue to move in an east to west direction with the moderate to breezy trade winds. Several bands of unstable open cell cumulus clouds are shown along a low level 700 mb trough axis moving into the islands from the east. Low level convergence near this trough will link up with upper level lift from an upper level trough over the islands, increasing shower activity from east to west through Monday. Periods of wet trade wind showers remain in the forecast for the next 24 hours.

In the big picture, a high pressure system north of the Hawaiian Islands will keep moderate to locally breezy trade winds in the forecast through Monday. By Tuesday this high pressure system drifts northeast away from the islands, decreasing local wind speeds, and allowing thermally driven land/sea breezes to develop over leeward areas. This light wind speed pattern will continue through Friday. High pressure builds back in by Saturday with another increase in showers just in time for the weekend.

The forecast grids this evening look good, no evening updates are expected.

AVIATION. An elongated ridge of high pressure north of the state will maintain moderate to occasionally breezy trades across the islands tonight. Scattered to numerous showers will mainly affect windward locations and bring periods of MVFR conditions due to lowered ceilings and visibility.

AIRMET Tango remains in effect below 8000 feet for south thru west of mountains due to tempo moderate turbulence.

MARINE. High pressure north-northeast of the islands will keep fresh to strong trades in place through Monday. As a result, a Small Craft Advisory (SCA) remains posted for the typically windy waters around Maui County and the Big Island. A couple troughs of low pressure will pass by to the north of the state Tuesday through Friday, easing the trades into the light to moderate range in most areas, with fresh trades holding in the typically windier channel waters. Trades should then ramp back up to locally strong levels next weekend as high pressure strengthens far to the north of the island chain.

There will be a series of small southerly swells over the next several days that will keep south shore surf near of just above background levels. A slightly larger long period south swell may fill in Friday and Saturday. East facing shores will continue to experience short period choppy surf produced by the trade winds. A small but slightly longer period east swell produced from former tropical cyclone Cristina, may provide a slight uptick in surf heights during the late Tuesday through Thursday time frame. No other significant swells are expected.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Bohlin AVIATION . JT MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi46 min NE 4.1 G 5.1 77°F 82°F1015.1 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi46 min NW 6 G 7 74°F 80°F1015.5 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi71 minE 410.00 miPartly Cloudy75°F68°F79%1015.4 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSE5CalmN9NE5N5NE4E3S6S8S12S11S15SW14SW15SW13SW13SW10SW9S7E12E6NE6E3E4
1 day agoSE3E4CalmN5NE4NE4SE6S5S8SW6W6W8SW9SW9S7S10S11SE8NE16
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2 days agoSE6SE7E7SE5E5S4S7S7SW4SW7SW8SW8S9SW8SW7SW7SW6SE7SE8E6CalmCalmCalmCalm

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Mon -- 12:33 AM HST     Moonrise
Mon -- 04:21 AM HST     0.16 feet Low Tide
Mon -- 05:53 AM HST     Sunrise
Mon -- 11:42 AM HST     1.49 feet High Tide
Mon -- 01:14 PM HST     Moonset
Mon -- 05:50 PM HST     0.83 feet Low Tide
Mon -- 07:05 PM HST     Sunset
Mon -- 09:58 PM HST     1.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.70.50.30.20.20.30.60.81.11.31.51.51.41.31.10.90.90.80.911.11.11.1

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 12:34 AM HST     Moonrise
Mon -- 04:11 AM HST     0.14 feet Low Tide
Mon -- 05:53 AM HST     Sunrise
Mon -- 11:24 AM HST     1.49 feet High Tide
Mon -- 01:15 PM HST     Moonset
Mon -- 05:27 PM HST     0.83 feet Low Tide
Mon -- 07:06 PM HST     Sunset
Mon -- 09:57 PM HST     1.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.70.40.20.10.20.30.60.91.21.41.51.51.41.21.10.90.80.80.911.11.21.1

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 (7,2,3,4)
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Ground Weather Radar Station South Shore, 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.