Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Naalehu, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:14AMSunset 6:35PM Wednesday March 29, 2017 8:39 PM HST (06:39 UTC) Moonrise 7:45AMMoonset 8:37PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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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PHZ124 Big Island Southeast Waters- 329 Pm Hst Wed Mar 29 2017
Tonight..Northeast winds 20 kt. Wind waves 7 ft. Northwest swell 5 ft. Isolated showers in the evening...then scattered showers after midnight.
Thursday..Northeast winds 20 kt. Wind waves 7 ft. Northwest swell 4 ft. Scattered showers in the morning...then isolated showers in the afternoon.
Thursday night..Northeast winds 20 kt. Wind waves 7 ft. Northwest swell 4 ft. Isolated showers in the evening...then scattered showers after midnight.
Friday..East winds 20 kt. Wind waves 7 ft. Northwest swell 5 ft increasing to 7 ft in the afternoon. Isolated showers in the morning.
Friday night..East winds to 25 kt. Wind waves 8 ft. Northwest swell 8 ft. Isolated showers in the evening...then scattered showers after midnight.
Saturday..East winds to 25 kt. Wind waves 9 ft. Northwest swell 8 ft. Scattered showers in the morning...then isolated showers in the afternoon.
Saturday night..Northeast winds to 25 kt. Wind waves 10 ft. Northwest swell 7 ft. Scattered showers.
Sunday..Northeast winds to 25 kt. Wind waves 10 ft. Northwest swell 4 to 6 ft. Scattered showers.
Monday..East winds to 25 kt. Wind waves 11 ft. Northwest swell 3 to 4 ft. Isolated showers.
PHZ100 329 Pm Hst Wed Mar 29 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will weaken as a cold front approaches and stalls northwest of the area Thursday through Friday. High pressure will build north of the state over the weekend behind this front.

7 Day Forecast for Marine Location Near Naalehu, HI
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location: 19.08, -155.55     debug


Area Discussion for -
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Fxhw60 phfo 300155
afdhfo
area forecast discussion
national weather service honolulu hi
355 pm hst Wed mar 29 2017

Synopsis
Light trade winds over the western end of the state will allow
for leeward afternoon sea breezes over kauai and oahu Thursday with
increasing afternoon clouds and brief showers. Moderate trade
winds will continue over the rest of the state with passing
windward showers. Trade winds will become breezy over the weekend
with increasing windward rainfall expected.

Discussion
High pressure located in the east pacific is maintaining moderate
trade winds over the eastern half of the state with light east
southeast flow over the western islands. An area of clouds and
showers currently east of the big island will bring increasing
windward showers to the hilo and puna districts tonight.

The lighter winds over the western islands will allow for
afternoon leeward sea breezes over kauai and oahu Thursday, with
increasing afternoon clouds and showers over the interior island
areas. Passing windward showers will continue over maui county and
the big island. This pattern will continue through Thursday before
high pressure gradually builds north of the state Friday. Trade
winds will increase in response, with breezy to windy conditions
expected over the weekend and into next week. Showers will also
increase with a focus over windward and mountain areas, with
spotty showers over leeward locations. Weaker trade wind flow is
expected by midweek as high pressure weakens and a cold front
passes by to the north.

Aviation
Moderate trade winds will continue for the next few days. No
significant weather features are expected. Clouds and showers will
favor the windward and mountain areas. Periods of MVFR cigs/vis
can be expected for those areas, mainly overnight and early
morning. No airmets are expected at this time.

An upper level trough and jet is helping to produce light to
moderate turbulence between fl300/360 more than 250 nm northeast
of the state. The trough and jet are shifting to the east,
therefore no airmet tango will be issued.

Marine
Surf along north and west facing shores is somewhat higher than
expected today due to a reinforcing northwest swell and looks to
remain so through Thursday, though still below advisory level.

The latest surface analysis showed a 998 mb storm-force low
centered around 1600 nm northwest of kauai just west of the date
line with a large area of west-northwest storm-force winds
(focused within the 290 to 310 directional band relative to the
islands) just to its south and west. According to the latest
altimeter passes, seas associated with this system continue to
range from 30 to 35 ft over the heart of the fetch region focused
toward the islands, which has been persistent for the past several
passes. This low is forecast to track east-northeast across the
north pacific through the week.

A large west-northwest swell (290-310 deg) associated with this
system should reach the islands Thursday night, peak Friday and
Friday night, then slowly ease over the weekend. Warning-level
surf for exposed north and west facing beaches and advisory-level
seas are expected during this time. All of the models remain in
close agreement for seas to ramp up quickly Thursday night to small
craft advisory levels and peak in the 10 to 14 ft range Friday,
before slowly easing through the weekend. If the swell comes in
larger or later than predicted, warning-level surf could continue
into Saturday before dropping to advisory levels Sunday.

Local winds and seas will likely remain below advisory levels
through Friday as the ridge of high pressure north of the state
slightly weakens in response to a cold front that is forecast to
approach the region later in the week. Advisory-level trade winds
will return across portions of the waters over the weekend as high
pressure builds north of the state behind this front.

Surf along east facing shores will remain small and choppy through
the week due to moderate to fresh onshore winds. Surf will begin
to build over the weekend as easterly winds strengthen locally
and upstream of the islands, and may near or reach advisory levels
along east facing shores by the end of the weekend and into early
next week.

A slight increase in surf along south facing shores is possible
Thursday through Saturday due to a long-period swell (190 deg)
from recent activity across the southern pacific. In addition to
this southerly swell, wrap from the previously discussed large
west-northwest swell will add some to the mix by Friday at select
spots along exposed southern facing beaches.

Hfo watches/warnings/advisories
None.

Morrison... Discussion
eaton... Aviation
ts... Marine


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 52 mi52 min SE 6 G 13 75°F 76°F1019.3 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI46 mi47 minSE 10 G 1710.00 miFair78°F64°F64%1017.6 hPa

Wind History from HKO (wind in knots)
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Last 24hrW6CalmNE3SE6E6SE5CalmNE3E7E4E4E4S4SW10S11SW11SW10SW7SW7SW8SW8S8S9SE10
G17
1 day agoSE8SE11SE10SE10SE10SE9E7E5E4NE6NE5NE3NW5W7W8W8W9W11SW10SW11W11W10W9W9
2 days ago--SE3CalmE3CalmE3E4SE5SE7S4SE7SE6S7S8W7W10W8W11W11W10W9W7W6SW4

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Thu -- 05:07 AM HST     1.93 feet High Tide
Thu -- 06:17 AM HST     Sunrise
Thu -- 08:34 AM HST     Moonrise
Thu -- 11:17 AM HST     -0.39 feet Low Tide
Thu -- 06:05 PM HST     2.42 feet High Tide
Thu -- 06:35 PM HST     Sunset
Thu -- 09:39 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.50.91.41.81.91.81.50.90.3-0.1-0.4-0.300.61.21.82.32.42.31.91.40.90.5

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Thu -- 05:14 AM HST     1.29 feet High Tide
Thu -- 06:18 AM HST     Sunrise
Thu -- 08:35 AM HST     Moonrise
Thu -- 11:18 AM HST     -0.13 feet Low Tide
Thu -- 06:07 PM HST     1.92 feet High Tide
Thu -- 06:37 PM HST     Sunset
Thu -- 09:41 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.30.60.91.21.31.210.70.30-0.1-0.10.20.511.51.81.91.81.61.20.80.5

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.