Saturday, February24, 2018 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 6:42AMSunset 6:24PM Friday February 23, 2018 9:56 PM HST (07:56 UTC) Moonrise 12:32PMMoonset 12:55AM Illumination 66% Phase: Waxing Gibbous; Moon at 9 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- 928 Pm Hst Fri Feb 23 2018
.gale warning in effect through early Saturday morning...
.small craft advisory in effect from Saturday morning through early Monday morning...
Rest of tonight..Winds variable less than 10 knots west of the big island...east to 35 knots near south point. Wind waves around 6 feet. Mixed swell west 4 feet and east 6 feet. Hazy. Scattered showers with isolated Thunderstorms.
Saturday..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves around 6 feet. Mixed swell west 3 feet and east 7 feet. Hazy. Scattered showers with isolated Thunderstorms.
Saturday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves around 7 feet. Mixed swell west 3 feet and east 7 feet. Hazy. Scattered showers.
Sunday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves around 7 feet. SWell east 7 feet. Hazy. Scattered showers.
Sunday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves around 7 feet. SWell east 6 feet. Hazy. Scattered showers.
Monday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves around 8 feet. SWell east 6 feet. Hazy. Isolated showers.
Monday night..West of the big island, winds variable less than 10 knots, becoming west 10 knots after midnight. NEar south point, east winds to 30 knots. Wind waves around 8 feet. SWell east 6 to 7 feet. Hazy. Isolated showers.
Tuesday..West of the big island, northwest winds 10 knots, becoming south in the evening, then becoming west after midnight. NEar south point, east winds to 30 knots. Wind waves around 7 feet. SWell east 7 to 9 feet. Hazy. Isolated showers.
Wednesday..West of the big island, south winds 10 knots, becoming variable less than 10 knots. NEar south point, east winds to 30 knots. Wind waves around 7 feet. SWell east 9 feet. Hazy. Isolated showers.
PHZ100 928 Pm Hst Fri Feb 23 2018
Synopsis for hawaiian coastal waters.. Strong high pressure far north northeast of the area along with a nearly stationary surface trough northwest of kauai, will support breezy to locally windy east to southeast winds over the coastal waters through next week. An upper-level disturbance west of the area will allow for isolated Thunderstorms through the 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 240634
afdhfo
area forecast discussion
national weather service honolulu hi
834 pm hst Fri feb 23 2018

Synopsis
Moist and somewhat unstable conditions will persist across
portions of the state through the weekend. East to southeast
winds will focus rainfall over windward and southeast slopes. The
greatest threat for heavy showers and thunderstorms will be over
the big island tonight, then shift to the western end of the
island chain on Sunday. Drier conditions will push back over the
state early next week as potentially strong east to east-
southeast winds develop across the entire state.

Discussion
The large scale weather picture continues to show an upper level
closed low roughly 900 miles northwest of kauai and a strong 1040
mb high center far to the northeast of the state. The interaction
between these two features continues to draw tropical moisture
northward over the hawaiian islands keeping us in moist and
moderately unstable low level environment with a weak high level
subsidence inversion setting up around 10000 to 12000 foot level.

This stable inversion layer aloft has helped to limit shower
activity today to the windward slopes of each island. Chances for
heavy showers will linger over the big island overnight where
stronger instability exists in a deeper moisture layer. A flash
flood watch remains in effect for the big island until 6 am
Saturday morning. A winter storm warning also remains in effect
for the big island summits with snow packed icy roads are expected
for elevations above 12500 feet through Saturday morning.

The interaction between the ridge and a surface trough west of
kauai has increased winds over portions of the big island. A wind
advisory was issued today for sustained winds forecast to range
from 15 to 30 mph with locally higher gusts up to 50 mph. This
advisory remains in effect for the big island through Saturday
afternoon.

In the short term, we continue to see the upper low drifting
slowly northwest away from the state as the strong high pressure
ridge gradually builds in from the northeast. Shower activity on
Saturday will focus mainly over the windward slopes of each island
with higher chances for heavier showers developing along the
eastern slopes of maui and the big island. On Sunday forecast
guidance continues to show a shift in shower activity towards the
west with increasing rainfall chances over kauai and portions of
oahu as an upper level trough sweeps across the western edge of
the state.

A drier trend develops next week as the strong ridge builds in
over the islands. Enough moisture and instability will linger over
the windward sections of the big island for continued showers,
however the rest of the state will see improvement trends from
Monday to Tuesday. Stronger winds are expected on Tuesday
afternoon and Wednesday where additional wind advisories may be
needed as wind speeds ramp up across the state.

Aviation
High pressure northeast of the state and a trough of low pressure
to the west, will keep a gusty east to southeast flow in place
across the island chain through Saturday. A moist and unstable
airmass will remain over the island chain, particularly the E and
se areas of the big island, where widespread MVFR and isolated
ifr conditions are expected. Across the smaller islands isolated
MVFR conditions will be possible mainly in windward areas.

Airmet sierra remains in place for mountain obscuration across
e to SE facing slopes of the big island and NE thru SE facing
sections of east maui. No other airmets are in effect.

Marine
An unstable airmass will continue the possibility for isolated
thunderstorms over all coastal waters through Saturday, before
shifting the focus over the western half through Sunday.

A gale warning remains posted for waters around the big island
overnight due to the strong winds observed in the scatterometer
pass earlier today. Still expect the winds there to drop a bit
Saturday back to small craft advisory (sca) levels. Strong high
pressure far to the north-northeast will maintain breezy east to
southeast winds through the weekend, before an uptick in winds
during the first half of the new work week. An SCA remains posted
for most waters as a result of the winds and the resultant wave
heights. Its possible the SCA will need to be expanded next week
as the winds increase, and additional gale force winds are
possible.

A long and rather broad fetch of easterly winds on the
south side of the high will continue to produce advisory level
surf along east facing shores through the weekend and on into
early next week. Latest guidance from the wavewatch model
indicates surf could reach warning levels as early as Monday night
or Tuesday. This combined with high astronomical tides could
cause some coastal inundation issues along some low lying areas
exposed to east.

The current small northwest swell will lower gradually tonight
through Saturday. Otherwise surf along north and west facing
shores will be well below normal for this time of year during the
Sunday through Thursday time period. A series of small, mainly
background south swells can be expected through the weekend and on
into the middle of next week.

See the latest oahu surf discussion (srdhfo) for additional
details on surf and swell.

Hfo watches warnings advisories
High surf advisory until 6 am hst Monday for kauai windward-oahu
koolau-olomana-molokai windward-maui windward west-windward
haleakala-south big island-big island north and east.

Flash flood watch until 6 am hst Saturday for kona-south big
island-big island north and east-kohala-big island interior.

Wind advisory until 6 pm hst Saturday for kona-south big island-
big island north and east-kohala-big island interior.

Winter storm warning until 6 am hst Saturday for big island
summits.

Small craft advisory from 6 am Saturday to 6 am hst Monday for
alenuihaha channel-big island windward waters-big island leeward
waters-big island southeast waters.

Gale warning until 6 am hst Saturday for alenuihaha channel-big
island windward waters-big island leeward waters-big island
southeast waters.

Small craft advisory until 6 am hst Monday for kauai northwest
waters-kauai windward waters-oahu windward waters-kaiwi channel-
maui county windward waters.

Discussion... Bohlin
aviation... Jelsema
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi38 min N 1.9 G 2.9 79°F 77°F1016.7 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi38 min SW 1 G 1.9 67°F 75°F1020 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi63 minN 010.00 miMostly Cloudy77°F64°F66%1016.7 hPa

Wind History from HKO (wind in knots)
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Last 24hrSE5N4E7SE10SE7S3E6E6N7SE11E3CalmN3S5S13S17SE23
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SE18SE16SE15SE8E4Calm
1 day agoE4E3SE6S4SE7SE5E5E3NE5N7N9N11E5SE11S15S9S11S6NW4NW6W5S5S6SE7
2 days agoN6N6NE5SE8SE9E6E4CalmE3CalmSE5SE8S7S8S7S7SW5NW4N4N7N9N8NE6NE3

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 01:55 AM HST     Moonset
Sat -- 06:46 AM HST     0.39 feet Low Tide
Sat -- 06:46 AM HST     Sunrise
Sat -- 11:06 AM HST     0.75 feet High Tide
Sat -- 01:27 PM HST     Moonrise
Sat -- 04:55 PM HST     -0.01 feet Low Tide
Sat -- 06:27 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.71.51.10.80.60.40.40.50.60.70.70.70.60.40.20-00.10.30.71.11.61.9

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 01:55 AM HST     Moonset
Sat -- 06:43 AM HST     0.59 feet Low Tide
Sat -- 06:46 AM HST     Sunrise
Sat -- 10:34 AM HST     0.89 feet High Tide
Sat -- 01:27 PM HST     Moonrise
Sat -- 05:09 PM HST     -0.03 feet Low Tide
Sat -- 06:27 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.61.41.10.90.70.60.60.70.80.90.90.80.70.40.20.1-000.20.50.91.31.6

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 (2,6,7,8)
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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.