Tuesday, March28, 2017 L-36.com


Marine Weather and Tides
Hawi, 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 6:20AMSunset 6:40PM Tuesday March 28, 2017 1:58 AM HST (11:58 UTC) Moonrise 7:00AMMoonset 7:39PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PHZ121 Alenuihaha Channel- 937 Pm Hst Mon Mar 27 2017
.small craft advisory in effect through early Tuesday morning...
Rest of tonight..East winds 20 kt. Wind waves 6 ft. West swell 6 ft. Isolated showers after midnight.
Tuesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Isolated showers in the morning.
Tuesday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft.
Wednesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Scattered showers in the morning. Isolated showers in the afternoon.
Wednesday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Isolated showers in the evening. Scattered showers after midnight.
Thursday..East winds 15 kt. Wind waves 6 ft. Northwest swell 5 ft. Isolated showers in the morning. Scattered showers in the afternoon.
Thursday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Scattered showers.
Friday..East winds 15 kt. Wind waves 5 to 6 ft. West swell 8 to 10 ft. Isolated showers.
Saturday..East winds to 25 kt. Wind waves 6 to 8 ft. West swell 7 to 9 ft. Isolated showers.
PHZ100 937 Pm Hst Mon Mar 27 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the islands will shift east through midweek as a cold front passes far north of the state.

7 Day Forecast for Marine Location Near Hawi, HI
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location: 20.41, -156.09     debug


Area Discussion for -
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Fxhw60 phfo 280709
afdhfo
area forecast discussion
national weather service honolulu hi
909 pm hst Mon mar 27 2017

Synopsis
A surface ridge north of the state is expected to maintain
moderate east to east-southeast flow across the islands through
late Thursday. An upper level trough will dig east of the island
chain Tuesday night, and will bring an increase in showers over
windward facing slopes of the state during the second half of the
work week. A band of clouds and showers ahead of a front may
impact parts of the state Thursday night and Friday, but the front
is not expected to reach the islands. A surface high is forecast
to build northeast of the area this weekend, which will produce
breezy trades starting Saturday.

Discussion
A nearly stationary 1031 mb surface high is centered nearly 1800
miles east-northeast of honolulu early this evening. A surface
ridge extends west-southwest from the high through a point about
280 miles north of lihue. The pressure gradient south and
southwest of these features is maintaining light to moderate east
to east-southeast winds across the state. The weaker background
surface winds, which are mainly over the western end of the state,
are allowing local land breezes to become established over some of
the islands. Especially parts of kauai and oahu. Also, a mid-
tropospheric ridge, which remains nearly stationary above the main
hawaiian islands, continues to provide stable atmospheric
conditions across the region. Satellite imagery shows low clouds
over some parts of the state early this evening. These clouds
appear to be tinning over many areas, except over parts of oahu,
where low clouds and showers continue along the koolau and waianae
mountain ranges. Additonal low clouds and showers are over east
molokai and east maui, as well as near the eastern puna district
on the big island.

The surface ridge is expected to remain north of the islands
through Thursday night, which will continue to drive the light to
moderate east to east-southeast winds across the state. The mid-
tropospheric ridge will also keep the atmosphere stable through
Tuesday night, so rainfall will remain light. However, the
forecast models show an increase in precipitation starting early
Wednesday morning as an upper level trough digs in east of the
state Tuesday night and Wednesday. The presence of this trough
aloft east of the area will potentially enhance the low clouds
and precipitation tracking in from upstream. Therefore, expect
slightly wetter trade wind conditions during mid-week. The low-
level flow will focus most of the low clouds and showers over
windward and southeast facing slopes. Leeward areas may also have
brief showers.

The western end of the surface ridge to our north is expected to
erode by late Thursday as a cold front approaches from the
northwest. This front will likely stall and weaken two to three
hundred miles north-northwest of kauai by late Friday, so it is
not expected to ever reach the state. However, the forecast models
continue to show a band of clouds and showers forming over the
western end of the state southeast of the front, which might
produce additional wet weather over parts of the state late
Thursday and Friday.

An upper level ridge will likely to build over the state from
late Friday through this weekend. This will result in more stable
atmospheric conditions. Also, a surface high is expected to build
northeast of the region this weekend, which will likely produce
breezy conditions across the hawaiian islands. We also expect a
drier air mass over most of the state this weekend, so typical
windward and mauka showers will be brought in by the trades.

Aviation
High pressure northeast of the state will keep a light to
moderate trade wind flow in place through Tuesday. Convective
showers over leeward areas resulting from daytime heating should
end over the next hour or two, with showers then favoring
windward and mauka areas overnight. Localized sea breezes are
expected to develop on Tuesday, and this will lead to convective
showers over leeward areas once again. Brief MVFR cigs/vsbys will
be possible in showers, but predominantlyVFR conditions are
expected over the next 24 hours.

No airmets are currently in effect.

Marine
The west-northwest (290-310 deg) swell that peaked Sunday into
Monday will slowly ease into Tuesday, then hold through mid week
due to a slight reinforcement Tuesday night into Wednesday. A
combination of this swell and moderate to fresh breezes over the
channels and waters around the big island will continue to
generate rough boating conditions. Although the winds have dropped
slightly below small craft advisory levels (25 kt), seas will hold
around 10 ft overnight and possibly into Tuesday across windward
waters exposed to northwest swells and over the waters south of
the big island. As a result, the small craft advisory will remain
up overnight across these areas for seas. Winds will likely remain
below advisory levels through Friday as the ridge of high pressure
north of the state slightly weakens in response to a passing cold
front well north of the area. Another cold front is forecast to
approach the region later in the week, then stall and weaken north
and northwest of the area into the upcoming weekend. Advisory-
level winds will likely return across portions of the waters over
the weekend as high pressure builds north of the state.

Surf along east facing shores will remain small and choppy through
the week due to moderate to fresh onshore winds persisting. A slight
increase will be possible over the weekend as the winds strengthen
locally and upstream of the islands.

A slight increase in surf along south facing shores will be possible
Thursday through Saturday due to a long-period swell (190 deg)
associated with recent activity across the southern pacific. In
addition to this southerly swell, another large west-northwest
swell(discussed below) expected by Friday could impact the southern
shores once again at select spots due to wrapping around the
islands.

Later in the week, the main forecast challenge will become centered
on another, potentially larger, west-northwest (290-310 deg)
swell that will impact the islands Thursday night through the
weekend. A powerful storm-force low that may have briefly reached
hurricane force earlier this morning off the coast of japan is
currently tracking east-northeastward across the northwest
pacific. The latest surface analysis showed this storm-force low
centered just under 1000 nm east of tokyo with a central pressure
of 988 mb. An ascat pass earlier today reflected this system and
showed a large batch of gale to storm force winds (34-50 kt) out
of the west focused toward the region. Model consensus remains in
decent agreement over the upcoming few days and depicts this
system continuing to deepen to around 970 mb as it approaches and
moves across the date line Tuesday night into Wednesday. The
westerly wind field associated with this system is forecast to
expand through this period and remain at gale to storm force
levels over a large area with seas reaching as high 30 to 40 ft. A
large west-northwest swell associated with this system will
result across the region, that could reach the islands as early as
Thursday night, peak through the day Friday, then slowly ease over
the upcoming weekend. Some uncertainty regarding the details this
far out still exists due to some model differences depicted
between the ecmwf- wave and gfs- wavewatch iii solutions.

Regardless of these subtle differences, warning-level surf and
advisory-level seas will be likely Friday into the weekend before
trending down. More details will follow in later packages this
week with regard to specifics on arrival times and impacts.

Hfo watches/warnings/advisories
High surf advisory until 6 am hst Tuesday for north and west
facing shores of niihau, kauai, oahu and molokai, north facing
shores of maui, and west facing shores of the big island.

Small craft advisory until 6 am hst Tuesday for oahu windward
waters-kaiwi channel-maui county windward waters-alenuihaha
channel-big island windward waters-big island leeward waters-big
island southeast waters.

Discussion... Houston
aviation... Jelsema
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 29 mi40 min Calm G 1.9 75°F 79°F1018.7 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 39 mi46 min NW 5.1 G 5.1 73°F 77°F1019.5 hPa
51205 46 mi49 min 76°F6 ft
51203 - Kaumalapau, HI (146) 55 mi43 min 78°F5 ft
ILOH1 - 1617760 - Hilo, HI 72 mi40 min SW 6 G 8 67°F 76°F1020.2 hPa

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
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G14
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI38 mi64 minS 510.00 miMostly Cloudy70°F64°F82%1020.3 hPa

Wind History from HOG (wind in knots)
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Last 24hrSE7E4CalmSE7S3SE8S3SE6E10
G19
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G24
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3W7SE6E6SE7SE6SE6S5
1 day agoNE9NE14
G23
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G27
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G30
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SE6CalmE4SE6
2 days agoCalmN3E5CalmNE9NE6NE12NE14
G21
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G28
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NE7E7NE16
G23
NE13

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Tue -- 03:02 AM HST     2.05 feet High Tide
Tue -- 06:20 AM HST     Sunrise
Tue -- 06:59 AM HST     Moonrise
Tue -- 09:06 AM HST     -0.23 feet Low Tide
Tue -- 03:39 PM HST     2.15 feet High Tide
Tue -- 06:37 PM HST     Sunset
Tue -- 07:38 PM HST     Moonset
Tue -- 09:40 PM HST     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.921.91.510.4-0-0.2-0.10.20.81.31.82.12.11.91.40.90.40.100.2

Tide / Current Tables for Kawaihae, Hawaii Island, Hawaii
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Kawaihae
Click for Map
Tue -- 04:19 AM HST     1.95 feet High Tide
Tue -- 06:19 AM HST     Sunrise
Tue -- 06:58 AM HST     Moonrise
Tue -- 10:33 AM HST     -0.16 feet Low Tide
Tue -- 04:53 PM HST     2.06 feet High Tide
Tue -- 06:36 PM HST     Sunset
Tue -- 07:37 PM HST     Moonset
Tue -- 11:04 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.81.31.71.91.91.61.10.60.2-0.1-0.10.10.61.11.622.11.91.510.50.20

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