Wednesday, May24, 2017 L-36.com


Marine Weather and Tides
Captain Cook, HI

Version 3.4
What's New / NOTES
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 5:40AMSunset 6:54PM Wednesday May 24, 2017 3:23 AM HST (13:23 UTC) Moonrise 4:59AMMoonset 6:07PM Illumination 1% Phase: Waning Crescent; Moon at 28 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- 937 Pm Hst Tue May 23 2017
.small craft advisory in effect through early Thursday morning...
Rest of tonight..West winds 10 knots west of the big island... East to 25 knots near south point. Wind waves 8 feet. Northwest swell 3 feet. Haze. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Northwest swell 3 feet in the morning. Haze. Isolated showers.
Wednesday night..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 through the night.
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 6 feet. Haze. Isolated showers.
Thursday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. SWell south 3 feet. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Friday..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 in the morning. Haze 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. SWell south 3 to 4 feet. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Saturday..West of the big island...winds variable less than 10 knots becoming west 10 knots in the afternoon...then becoming variable less than 10 knots. NEar south point...east winds 15 knots. Wind waves 3 to 5 feet. SWell south 4 to 5 feet. Haze. Scattered showers.
Sunday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 to 5 feet. SWell south 3 to 4 feet. Haze. Scattered showers.
PHZ100 937 Pm Hst Tue May 23 2017
Synopsis for hawaiian coastal waters.. High pressure will remain in place well north of the state through midweek...then weaken Thursday 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 240642
afdhfo
area forecast discussion
national weather service honolulu hi
842 pm hst Tue may 23 2017

Synopsis
Strong trades will persist through Wednesday, pushing clouds and
showers across windward areas. Winds will gradually weaken through
the second half of the week, becoming light and variable through
the memorial day weekend. Daytime sea breezes and nighttime land
breezes will take over this weekend and bring warm and humid
weather with possible vog. A weak upper trough will pass over the
state this weekend and may provide some enhancement to afternoon
showers.

Discussion
Strong high pressure persists to our north, keeping trade winds
locally strong across the area this evening. Satellite loop shows
showery low clouds embedded within this trade flow moving across
oahu and the islands of maui county, keeping windward and mauka
areas of these islands wet and most areas of these islands
cloudy. Overcast low clouds persist across most of the big island,
but with less shower activity noted there on radar. Kauai is
clearer and drier this evening than her neighbors. The southern
edge of a 60 mile wide frontal cloud band is about 80 miles north
of kauai and has not moved much over the past 12 hours or so. The
area of clouds and showers across oahu and maui county may spread
to kauai overnight before moving west of the state.

Models show the trades will begin to weaken Wednesday night
through the end of the work week, then become quite light during
the holiday weekend. Background easterly flow will continue to
tap into lingering moisture over the state and fuel mainly
windward showers during the second half of the work week. Leeward
areas will see fewer showers during the night, but a hybrid sea
breeze pattern may produce afternoon cloud build ups and showers
by Friday. This weekend, background flow will likely veer to
southeasterlies, bringing voggy conditions to the smaller islands
through memorial day. Aloft, a weak upper level trough will swing
west to east over the islands and may enhance the afternoon sea
breeze driven showers.

Aviation
A strong surface high centered far north-northeast of hawaii will
maintain the breezy low-level trade wind flow across the islands
through Wednesday. A patch of broken to overcast low clouds with
embedded scattered to numerous showers will continue to move
slowly westward over the central islands this evening. This patch
of low clouds and showers is expected to reach kauai later
tonight. Expect additional low clouds and scattered trade showers
to persist into Wednesday, with periods of MVFR ceilings and
visibilities mainly over the higher terrain and along windward
facing slopes of most islands.

Airmet sierra remains in effect for mountain obscuration across
maui, molokai, lanai and oahu. This airmet may need to be expanded
to include kauai later tonight.

The trade wind speeds are strong enough to generate turbulence
leeward of the mountains on all islands. Therefore, airmet tango
remains in effect for low level turbulence over and below 8
thousand feet downwind of the higher terrain.

Marine
The latest surface analysis showed a large area of high pressure
(1041 mb) encompassing much of the northern pacific that was
centered around 1500 nm north of the waters. Remnants of a lingering
frontal boundary were analyzed from east to west just north of the
kauai and oahu waters. The pressure gradient between this boundary
and strong high pressure to its north continues to support a large
area of fresh to strong east-northeast winds. Although the highest
seas associated with these winds are aiming at an area northwest of
the local waters (offshore ndbc buoys 51000 and 51101 peaked in the
9-12 ft range today), seas across the windward waters have been
coming in at the exposed nearshore pacioos cdip buoys within 7 to 9
ft range (highest kauai oahu waters). The current marine forecast is
lining up well with these observations and no updates are
anticipated in the evening package.

The latest model guidance has initialized well with the current
synoptic pattern discussed and depicts the strong winds locally and
north of the area holding through Wednesday, then trending down
through the second half of the week as high pressure shifts
northeast over the gulf of alaska and weakens. Land sea breeze
conditions will become a possibility over the upcoming weekend,
which will allow the seas to trend down locally.

Surf along east facing shores will remain rough into Wednesday due
to strong onshore winds locally, then trend down through the second
half of the week as the trades relax.

Surf along north facing shores will steadily trend down through
midweek as the northwest swell that peaked on Monday eases and
shifts more out of the north. For the long range, models are hinting
at another moderate north-northwest (340 deg) swell filling in early
next week due to a low tracking east of the date line over the
weekend and deepening as it passes well north of the state on
Monday.

Surf along south facing shores is expected to trend down into
midweek as the small south swell eases. The largest south swell this
season is forecast to fill in late Thursday into Friday, peak Friday
night through Saturday, then slowly ease into early next week. This
swell is currently impacting the samoa buoy, where wave heights are
coming in slightly higher than predicted by guidance earlier today
(around one ft). A high surf advisory for south facing shores will
be likely through this time, which will continue into the memorial
day weekend.

In addition to the expected advisory-level surf through the memorial
day weekend along south facing shores, minor coastal flooding is
anticipated due to a combination of record level spring (king) tides
(especially for maui county and oahu) and large surf. Similar to the
april 28th through may 1st weekend, when the highest tides on record
were reported for honolulu, impacts will include beach flooding and
potentially standing water on roadways and low-lying areas near the
coast around the times of high tides each day through the weekend
(see listing of high tide times for honolulu below).

High tide times for honolulu:
5 24 Wednesday 3:36 pm hst
5 25 Thursday 4:20 pm hst
5 26 Friday 5:07 pm hst (peak water levels surf expected)
5 27 Saturday 5:55 pm hst (peak water levels surf expected)
5 28 Sunday 6:46 pm hst
5 29 Monday 7:40 pm hst
for more detailed information on surf for oahu, see the latest
collaborative nearshore swell and wind forecast that was issued
Monday afternoon (

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi53 min ENE 16 G 25 78°F 79°F1014.8 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi53 min S 2.9 G 4.1 71°F 78°F1016.3 hPa

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi30 minESE 810.00 miFair74°F63°F69%1014.6 hPa

Wind History from HKO (wind in knots)
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Last 24hrNE4NE5NE6CalmSE7S7SW9S9SW7W8SW6SW8S10S10S11SE5SE7E7E11NE13NW8N4S4SE8
1 day agoCalmCalmNE7N5N5NW8N16
G21
NW16E6
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--S13S13S10S9S10S9NE14N9NE12NE6NE8E33NE5
2 days agoE3NE4NE8NE6N9W6SW7W5W9W10W9W8SW8S6S6SW5CalmNE15N14NE11
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Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 02:16 AM HST     1.13 feet High Tide
Wed -- 04:59 AM HST     Moonrise
Wed -- 05:45 AM HST     Sunrise
Wed -- 08:14 AM HST     -0.33 feet Low Tide
Wed -- 03:16 PM HST     2.32 feet High Tide
Wed -- 06:06 PM HST     Moonset
Wed -- 06:56 PM HST     Sunset
Wed -- 10:05 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.711.11.10.90.50.2-0.2-0.3-0.300.51.11.72.12.32.221.510.50.20.10.2

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 02:10 AM HST     1.43 feet High Tide
Wed -- 04:59 AM HST     Moonrise
Wed -- 05:45 AM HST     Sunrise
Wed -- 08:27 AM HST     -0.45 feet Low Tide
Wed -- 03:24 PM HST     2.25 feet High Tide
Wed -- 06:06 PM HST     Moonset
Wed -- 06:56 PM HST     Sunset
Wed -- 09:43 PM HST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.31.41.41.10.70.2-0.2-0.4-0.4-0.10.30.91.522.22.21.91.510.50.30.20.4

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 (9,2,3,4)
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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.