Tuesday, March28, 2017 L-36.com


Marine Weather and Tides
Kahului, 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 3:27 PM HST (01:27 UTC) Moonrise 7:01AMMoonset 7:41PM Illumination 2% Phase: Waxing Crescent; Moon at 2 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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PHZ119 Maalaea Bay- 922 Am Hst Tue Mar 28 2017
Rest of today..North winds 20 kt. Wind waves 2 ft or less.
Tonight..North winds 20 kt. Wind waves 2 ft or less.
Wednesday..North winds 15 kt. Wind waves 2 ft or less.
Wednesday night..North winds 15 kt. Wind waves 2 ft or less.
Thursday..Northeast winds 15 kt. Wind waves 2 ft or less.
Thursday night..North winds 15 kt. Wind waves 2 ft or less.
Friday..North winds 20 kt. Wind waves 2 ft or less.
Saturday..North winds to 25 kt. Wind waves 3 to 4 ft.
PHZ100 922 Am Hst Tue Mar 28 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. High pressure will build north of the state over the weekend.

7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 281945
afdhfo
area forecast discussion
national weather service honolulu hi
945 am hst Tue mar 28 2017

Synopsis
A surface ridge north of the state will maintain light to
moderate east to east-southeast surface winds across the islands
through mid-week. An upper level trough, which will dig east of
the island chain later tonight and Wednesday, is expected to bring
an increase in showers over windward facing slopes of the state
during the second half of the work week. In addition, 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 building far northeast of the area
starting late Friday will produce breezy trades this weekend.

Discussion
A nearly stationary 1031 mb surface high is centered more than
1800 miles east-northeast of honolulu late this morning. A surface
ridge extends west-southwest from this high through a point about
300 miles north of lihue. The pressure gradient south and
southwest of these features is maintaining light to moderate east
to east-southeast wind flow across the state.

Water vapor imagery shows a shortwave trough is currently moving
by just north of the islands. The shortwave is providing some
enhancement to the low clouds and showers over and around the
state this morning. Patches of broken clouds and scattered showers
are observed on visible satellite and radar this morning. The light
east southeast winds are focusing most of the clouds and showers
over windward and mauka areas. For this afternoon, anticipating some
afternoon clouds and showers over interior sections of the islands
due to sea breezes building in.

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 flow. As the shortwave quickly
digs towards the southeast today, a mid-tropospheric ridge will
keep the atmosphere relatively stable through tonight. However,
the forecast models continue to show an increase in precipitation
starting late tonight as the shortwave digs in to the east of the
state tonight and Wednesday. The presence of this trough aloft
east of the area will continue enhance the low clouds and
precipitation tracking in from upstream through the rest of
the work week and possibly into Saturday.

Therefore, expect slightly wetter trade wind conditions after
tonight with the relatively weak low level flow focusing most of
these low clouds and showers over windward and southeast facing
slopes. Sea breezes will continue to dominate during the
afternoons and produce cloud build ups and showers.

The western end of the surface ridge to our north is expected to
erode some time on 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 suggest a band of clouds and showers will form near
the western end of the state to the southeast of the front. These
low clouds and showers might produce moderate rains over parts of
the state, particularly the western islands, late Thursday and
Friday.

The middle tropospheric ridge will likely strengthen above the
state from late Friday through this weekend. This will result in
more stable atmospheric conditions. Also, a surface high is
expected to build far northeast of the region this weekend, which
will likely produce breezy conditions across the hawaiian islands.

We also expect a slightly drier air mass over most of the state
this weekend. There will be some low clouds and brief showers
transported mainly into windward and mauka areas by the trades.

Aviation
Vfr conditions are expected to prevail. Some lingering clouds and
showers over the windward sides prompted airmet sierra for
mountain obscuration. Conditions are beginning to improve over
most of the area, so expect the airmet to be dropped shortly.

Some additional clouds are possible again overnight, which may
once again prompt an airmet for mountain obscuration. A north to
south oriented jet stream moving over this islands today may
likely require a sigmet shortly for upper level clear air
turbulence.

Marine
The west-northwest (290-310 deg) swell that peaked Sunday into
Monday will hold through mid week due to a slight reinforcement
tonight 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 through the
day today across windward waters between the big island and oahu.

As a result, the small craft advisory will remain up across these
areas for seas today. Surf associated with the west-northwest
swell should remain just below advisory levels along exposed
north and west facing shores through mid week.

Winds should remain below advisory levels through Friday as the
ridge of high pressure north of the state slightly weakens in
response to a two weak cold fronts passing north of the area.

Advisory-level winds will likely return across portions of the
waters over the weekend as high pressure builds north of the state
behind the second front.

Surf along east facing shores will remain small and choppy through
the week due to persistent moderate to fresh onshore winds, but
increase over the weekend as winds strengthen again locally. 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.

The main forecast challenge will be centered on another, slightly
larger, west-northwest (290-310 deg) swell that will impact the
islands Thursday night through the weekend. This is due to a powerful
storm-force low currently tracking east-northeastward across the
northwest pacific. Recent ascat and altimeter obs support latest model
model runs with regard to wind speeds and resulting sea heights.

The large west-northwest swell associated with this system could
reach the islands as early as Thursday night, peak through the day
Friday and Friday night, then slowly ease over the upcoming
weekend. Warning-level surf and advisory-level seas are expected
Friday into the weekend before trending down through the beginning
of next week. The southern shores could see impacts from this
swell again at select spots due to wrapping around the islands.

Hfo watches/warnings/advisories
Small craft advisory until 6 pm hst this evening for oahu
windward waters-maui county windward waters-big island windward
waters.

Discussion... Foster
aviation... M ballard
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi40 min NE 14 G 19 77°F 78°F1016.9 hPa
51205 8 mi49 min 77°F6 ft
51203 - Kaumalapau, HI (146) 30 mi43 min 78°F5 ft
51202 - Mokapu Point, HI (098) 73 mi54 min 76°F7 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
24hr
NE14
G19
NE13
G18
NW4
G9
W7
G13
NW8
N3
G7
NE1
S1
W4
G8
SE2
NW5
NE1
SE1
NW8
G12
NW2
N3
SE4
NW2
NE15
G19
NE14
G19
NE14
G17
NE16
G20
NE15
G20
NE15
G23
1 day
ago
NE24
G34
NE25
G34
NE18
G27
NE23
G29
NE13
G20
E7
G17
SE5
NW10
W7
G11
NW8
NE5
N2
G5
NW11
NW6
NW6
S1
SW1
SE4
G10
NE8
G13
NE14
G19
NE21
G26
NE21
NE20
NE17
G21
2 days
ago
NE16
G21
NE16
G20
NE17
G23
NE15
G23
NE14
G17
NE11
G16
NE11
G15
E11
G14
NE14
G21
N12
NE11
G17
NE16
G23
NE15
G21
NE16
G20
NE15
G20
SE5
NE15
G25
N2
G7
N11
G16
NE22
G28
NE24
G30
NE22
G32
NE25
G33
NE24
G33

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi34 minNE 19 G 2410.00 miPartly Cloudy and Breezy86°F64°F48%1017 hPa
Lahaina - West Maui, HI12 mi38 minNE 18 G 2315.00 miA Few Clouds and Breezy82°F57°F42%1016.9 hPa

Wind History from HOG (wind in knots)
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Last 24hrE18
G24
E12
G19
3W7SE6E6SE7SE6SE6S5SE6SE7S4S3CalmNE6SE3CalmE9
G20
E14
G23
E19
G23
E14
G24
E14
G24
NE19
G24
1 day agoE22
G34
NE20
G35
E19
G29
E15
G25
E13
G23
E9
G16
SE6CalmE4SE6SE7E4CalmSE7S3SE8S3SE6E10
G19
E15
G22
E14
G24
E14
G23
E13
G22
E14
G23
2 days agoE20
G30
NE18
G26
NE16
G23
NE13
G18
NE14
G22
E12
G20
NE7E7NE16
G23
NE13NE9NE14
G23
NE12
G23
NE14NE12
G17
SE9NE15
G27
S44NE22
G30
NE20
G29
NE23
G31
NE25
G33
NE20
G35

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 02:38 AM HST     2.18 feet High Tide
Tue -- 06:22 AM HST     Sunrise
Tue -- 07:01 AM HST     Moonrise
Tue -- 08:54 AM HST     -0.21 feet Low Tide
Tue -- 03:08 PM HST     2.12 feet High Tide
Tue -- 06:39 PM HST     Sunset
Tue -- 07:40 PM HST     Moonset
Tue -- 09:10 PM HST     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.82.12.21.91.40.80.3-0.1-0.2-00.411.51.92.121.71.20.70.30.10.20.5

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Tue -- 04:18 AM HST     1.85 feet High Tide
Tue -- 06:22 AM HST     Sunrise
Tue -- 07:01 AM HST     Moonrise
Tue -- 10:18 AM HST     -0.17 feet Low Tide
Tue -- 04:53 PM HST     1.97 feet High Tide
Tue -- 06:39 PM HST     Sunset
Tue -- 07:40 PM HST     Moonset
Tue -- 10:50 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
0.40.91.31.71.81.81.510.50.1-0.2-0.10.20.61.11.61.921.81.40.90.50.10

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 (21,6,7,8)
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Ground Weather Radar Station Molokai, 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.