Wednesday, August16, 2017 L-36.com


Marine Weather and Tides
Captain Cook, HI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:00AMSunset 6:48PM Wednesday August 16, 2017 5:23 AM HST (15:23 UTC) Moonrise 1:06AMMoonset 2:28PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 340 Am Hst Wed Aug 16 2017
.small craft advisory in effect through Thursday afternoon...
Today..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. Haze through the day.
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Haze through the night. Isolated showers after midnight.
Thursday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 7 feet. Isolated showers in the morning. Haze through the day.
Thursday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Haze through the night. Isolated showers after midnight.
Friday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers in the morning. Haze through the day.
Friday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell southeast 3 feet. Haze through the night. Isolated showers through the night.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Haze. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...northeast 20 knots near south point. Wind waves 6 feet. Haze. Isolated showers.
PHZ100 340 Am Hst Wed Aug 16 2017
Synopsis for hawaiian coastal waters.. A surface high far northeast of the islands will move slowly east into this weekend.

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 161357
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Wed aug 16 2017

Synopsis
High pressure far north-northeast of the islands will maintain
moderate trade winds over the islands at least through the rest of
the work week. Clouds and showers will favor the windward and mauka
areas under the trade wind flow. The leeward side of the big island
will see clouds and showers during the afternoon through the late
night hours.

Discussion
Trade wind weather continues across the islands early this evening
as a surface high pressure persists far north-northeast of the area.

More low clouds carried by the trades have reached the islands
overnight, bringing showers to mainly windward and mountain areas.

Satellite imagery revealed more ragged patches of low clouds are
present just east of the islands early this morning and these low
clouds will provide more passing showers to the area through rest of
the morning. Early morning lihue and hilo soundings stayed about the
same compared to yesterday afternoon's, with both soundings
depicting a somewhat stable air mass with low level moisture
extending to about 7k feet. Once again, expect low clouds and
showers in the island vicinity to decrease a bit later today with
daytime heating under a somewhat stable air mass.

Trade wind weather will prevail over the area through rest of the
work week, with some changes in the weather expected. The high far
north-northeast will drift further east and weaken slightly in the
next few days, then expected to remain nearly stationary over the
weekend into early next week. Therefore, expect a slow weakening
trend in the winds over the islands through the next few days, with
wind speeds easing low to moderate levels. Not much changes in the
low level moisture are expected in the next few days, though latest
model guidance still indicates an increase of tropical moisture over
the state this weekend and into early next week.

The central pacific hurricane center (cphc) continues to monitor the
potential development of a tropical depression southeast of the big
island of hawaii. As of 200 am hst, the probability of development
within 48 hours remains medium, while the probability is high that a
weak tropical cyclone may develop during the next 5 days. For
additional information on this system, please see the latest
tropical weather outlook issued by cphc at weather.Gov cphc. Since
it is still too early to know if an organized tropical system will
actually develop, the potential changes in weather conditions over
the main hawaiian islands later this weekend or early next week also
remain uncertain at this time. Based on the long range forecast
models, the biggest potential impacts may be a strengthening of
trade wind speeds, plus the possibility of more organized and
persistent showers, especially over the big island.

Aviation
High pressure northeast of the state will keep a moderate to locally
breezy trade wind flow in place through tonight. Clouds and showers
will favor windward and mauka areas, but a few showers will spread
leeward, particularly during the overnight and early morning hours.

MVFR CIGS vsbys will be possible in windward areas as the showers
move through, with phli and phto the most likely TAF sites to see
these conditions. Additionally, phny will likely see MVFR CIGS once
the sea breeze develops later today.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of the mountains of all islands. The airmet is
expected to continue through the day today.

Airmet sierra is in effect for mountain obscuration across windward
sections of kauai, oahu, molokai, maui and the big island.

Conditions are expected to improve later this morning.

Marine
A small craft advisory (sca) remains in effect for locally strong
trade winds across the typically windy waters adjacent to the
islands of maui county and the big island. The SCA is currently in
effect through Thursday afternoon. The latest forecast maintains sca
conditions in these same areas into this weekend.

A small, long-period south swell will maintain small background surf
along south facing shores through tonight. A small, long-period
south-southeast swell is expected to fill in Thursday, peak Friday,
and then gradually subside this weekend. Another small, reinforcing
long-period southwest swell is forecast to reach the islands this
weekend.

Rough moderate surf will persist along east facing shores due to
breezy trades in the vicinity of, and upstream of the islands. Surf
may trend down along east facing shores this weekend as the trades
weaken slightly. Surf will likely remain below the high surf
advisory criteria along all shorelines through early next week.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Thursday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Jelsema houston hui


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi53 min E 1.9 G 5.1 78°F 82°F1013.5 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi53 min W 5.1 G 6 72°F 80°F1014.5 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi30 minE 410.00 miFair76°F66°F72%1013 hPa

Wind History from HKO (wind in knots)
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Last 24hrNE3E6S6S9S12S10S12SW10SW9S9S8S8S9SE7S65NE6NE5NE6NE6CalmCalmE3E4
1 day agoE6E3SE3SW5SW8SW7W8W9W11W9W10SW8SW6S5SE4CalmNW4SE6SE6SE7E6SE7NE5NE4
2 days agoE4E8SE7S9S8SW10W9SW10SW10SW11SW8SW8SW8S74E7E9W3S6SE7SE4E3E6E4

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 01:05 AM HST     Moonrise
Wed -- 04:29 AM HST     0.12 feet Low Tide
Wed -- 06:04 AM HST     Sunrise
Wed -- 12:00 PM HST     2.17 feet High Tide
Wed -- 02:28 PM HST     Moonset
Wed -- 06:51 PM HST     Sunset
Wed -- 07:07 PM HST     0.54 feet Low Tide
Wed -- 11:38 PM HST     0.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.70.50.30.10.10.30.611.41.82.12.22.11.91.51.20.80.60.50.60.70.91

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 01:05 AM HST     Moonrise
Wed -- 04:41 AM HST     0.04 feet Low Tide
Wed -- 06:04 AM HST     Sunrise
Wed -- 12:21 PM HST     1.91 feet High Tide
Wed -- 02:28 PM HST     Moonset
Wed -- 06:51 PM HST     Sunset
Wed -- 07:01 PM HST     0.64 feet Low Tide
Wed -- 11:20 PM HST     1.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.70.50.20.100.20.40.81.21.51.81.91.91.71.41.10.90.70.60.70.811.1

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (11,2,3,4)
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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 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.