Friday, August18, 2017 L-36.com


Marine Weather and Tides
Launiupoko, 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 6:04AMSunset 6:54PM Thursday August 17, 2017 8:44 PM HST (06:44 UTC) Moonrise 2:02AMMoonset 3:34PM Illumination 17% Phase: Waning Crescent; Moon at 26 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- 322 Pm Hst Thu Aug 17 2017
.small craft advisory in effect through Friday afternoon...
Tonight..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds to 25 knots. Wind waves 2 feet or less.
Friday night..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Saturday..North winds 20 knots. Wind waves 2 feet or less.
Saturday night..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Sunday..North winds 15 knots. Wind waves 2 feet or less. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..North winds 15 knots. Wind waves 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Monday..North winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..North winds 20 knots. Wind waves 6 feet. Isolated showers.
PHZ100 322 Pm Hst Thu Aug 17 2017
Synopsis for hawaiian coastal waters.. A surface high far northeast of the islands will continue to move slowly east.

7 Day Forecast for Marine Location Near Launiupoko, HI
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location: 20.85, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 180131
afdhfo
area forecast discussion
national weather service honolulu hi
330 pm hst Thu aug 17 2017

Synopsis
Moderate to locally breezy trade winds will gradually diminish,
becoming light to moderate this weekend. The trade winds will
deliver periods of clouds and showers to windward areas, with
showers most active during nights and mornings. An increase in trade
wind showers is possible early next week, with potential for a few
afternoon leeward showers as winds diminish.

Discussion
A relatively stable trade wind weather regime will continue into the
weekend, with passing clouds and showers favoring windward slopes
and coasts, especially during nights and mornings. Visible imagery
shows limited low clouds directly upstream of the islands while
water vapor imagery depicts a dry NW flow aloft over the region
associated with a ridge aloft centered SW of the islands. A weak low
aloft located about 750 miles NE of the islands near 31n 152w is
having little effect on the stability of the island atmosphere, with
afternoon soundings depicting a strong subsidence inversion right
around 7000 feet.

Trade wind speeds are expected to gradually and slightly diminish
the next couple of days, as a surface high far NE of the islands
drifts E while a low-level trough (the remnants of former east
pacific tropical storm jova, which was spawned by the remnants of
atlantic hurricane franklin after it crossed mexico) moves wnw and
passes between the islands and the high center. This feature is
currently 1150 miles E of the islands near 18n 138w.

Meanwhile, in the GFS solution, the development of a bubble high to
the NW of the islands is expected to help support a light to
moderate trade wind flow through the weekend. ECMWF is weaker with
the high to the NW and therefore more significantly weakens winds
Sunday and Monday. Current wind forecast is a blend of the two
solutions, and the pop forecast allows for the potential of a few
afternoon convective showers over leeward areas. The mid-level low
to the nne of the islands will very move slowly W the next couple of
days, and is not expected to provide significant instability in the
short term. It will however help to ensure that trade winds drop a
few windward showers as the subsidence inversion will remain
sufficiently high to support shower development, but sufficiently
low to suppress cloud tops to below 8000 feet or so.

An area of disturbed weather about 650 miles SE of the big island
continues to be monitored for potential development of a tropical
depression. Associated shower and thunderstorm coverage has recently
diminished significantly, and it is looking less likely that a
tropical depression will form. See tropical weather outlooks issued
by the central pacific hurricane center for updates and details.

Forecast models differ in their handling of the pressure and
moisture fields associated with the area of disturbed weather to the
se, especially early next week. An increase in moisture riding in on
the trades during the Monday-Tuesday time frame is the general
expectation, with latest model runs trending toward a somewhat later
arrival time, while also trending slightly drier as the bulk of the
moisture remains S of the islands. The low aloft and its associated
destabilizing cool pocket of mid-level air is expected to be closer
to the islands at the same time, and there is a chance this
combination leads to the development of heavy showers. Confidence is
low as to 1) the timing and the amount of low-level moisture that
arrives on the trade wind flow, and 2) how weak the trade wind flow
will become this weekend and early next week as the remnants of jova
pass N of the islands. By mid-week the low aloft will move W away
from the area and deep-layer ridging building toward the area from
the NE will bring increasing trade winds and stability.

Aviation
A high pressure ridge north of the islands will maintain moderate to
locally breezy trade winds for another day or so. Winds are
sufficiently strong enough to maintain airmet tango for mechanical
low level turbulence to the lee of the mountains on all islands.

Winds are expected to start to decline tonight and Friday, so expect
conditions to improve by this weekend.

Vfr conditions are expected to persist across the area, though there
will be some clouds and showers focused over the windward sides of
the islands.

Marine
Surface high pressure far northeast of the islands will maintain
moderate to locally strong trades winds. This will continue to
result in small craft advisory (sca) conditions for the typically
windy waters adjacent to the islands of maui county and the big
island. The SCA for these areas remains in effect through Friday
afternoon. The high is expected to continue drifting eastward during
the next few days, and a slight downward trend in trade wind speeds
is expected from Friday night through this weekend.

A small, long period south-southeast swell is expected to peak late
Friday before gradually subsiding this weekend. A small reinforcing
long-period southwest swell is forecast to reach the islands
Saturday, and continue into early next week.

Surf is expected to trend down along east facing shores this weekend
as the trades weaken slightly. Surf will likely remain below the
high surf advisory criteria along all shorelines through the middle
of next week.

A period of above normal high tides is expected through this
weekend. The water levels associated with these tides are forecast
to be slightly lower than those observed in july. In addition, no
large swells are expected during the next several days. There could
still be some localized coastal flooding from these tides. See the
special weather statement, spshfo, for more details.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Friday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Birchard
aviation... M ballard
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi44 min NE 12 G 17 78°F 81°F1014.9 hPa (+1.2)
51205 18 mi35 min 80°F5 ft
51202 - Mokapu Point, HI (098) 66 mi40 min 80°F4 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE9
G13
NE9
G12
NE7
G10
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G14
NE9
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NE7
G12
NE7
N6
E8
G13
NE5
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G12
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G15
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G17
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NE12
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NE10
G13
NE12
G15
NE8
G12
NE12
G19
NE16
NE11
G16
E7
G11
NE10
G16
NE6
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NE9
G14
NE7
G10
N11
N16
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NE17
NE16
G20
NE17
G22
NE16
G20
NE14
G19
NE14
G18
NE12
G18
NE12
G17
NE8
G11
2 days
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NE16
NE12
G16
NE11
G17
NE9
G14
NE15
G20
NE19
G23
NE15
G20
NE14
G20
NE17
G25
NE18
G23
NE20
NE21
G26
NE18
G23
NE16
G21
NE17
G23
NE14
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi2.9 hrsNNE 1515.00 miPartly Cloudy81°F66°F62%1014.2 hPa
Kahului, Kahului Airport, HI14 mi50 minNE 1210.00 miFair78°F66°F69%1015.1 hPa
Lanai City, Lanai Airport, HI15 mi48 minNE 1210.00 miMostly Cloudy73°F66°F79%1014.5 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE8NE6NE9NE12NE13
G21
NE15
G22
NE15NE18--NE18
G24
NE15
G22
NE15
1 day ago------------------------E8--NE14E13NE15NE15NE15NE11NE13
G19
N16NE18
G24
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2 days ago------------------------6NE7NE12E12E10
G16
NE10
G18
NE15
G23
NE19NE18NE18NE15
G21
NE15

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 12:36 AM HST     1.14 feet High Tide
Fri -- 03:01 AM HST     Moonrise
Fri -- 06:05 AM HST     0.15 feet Low Tide
Fri -- 06:06 AM HST     Sunrise
Fri -- 01:33 PM HST     2.60 feet High Tide
Fri -- 04:33 PM HST     Moonset
Fri -- 06:53 PM HST     Sunset
Fri -- 08:32 PM HST     0.41 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.110.80.50.30.10.20.50.91.41.92.32.62.62.421.510.60.40.40.60.8

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 03:00 AM HST     Moonrise
Fri -- 05:35 AM HST     -0.14 feet Low Tide
Fri -- 06:05 AM HST     Sunrise
Fri -- 01:05 PM HST     2.63 feet High Tide
Fri -- 04:32 PM HST     Moonset
Fri -- 06:53 PM HST     Sunset
Fri -- 07:40 PM HST     0.81 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.10.80.40.1-0.1-0.10.10.511.62.12.52.62.52.21.81.410.80.80.91.11.3

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 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.