Wednesday, December13, 2017 L-36.com


Marine Weather and Tides
Lanai City, 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 6:53AMSunset 5:48PM Wednesday December 13, 2017 12:59 AM HST (10:59 UTC) Moonrise 3:06AMMoonset 3:03PM Illumination 25% Phase: Waning Crescent; Moon at 25 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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PHZ118 Maui County Leeward Waters- 947 Pm Hst Tue Dec 12 2017
.small craft advisory in effect through early Friday morning...
Rest of tonight..North winds 15 knots. Wind waves 4 feet. Northwest swell 10 feet. Scattered showers.
Wednesday..North winds 20 knots. Wind waves 6 feet. Northwest swell 12 feet. Scattered showers in the morning.
Wednesday night..Northeast winds 20 knots. Wind waves 6 feet. Northwest swell 10 feet.
Thursday..Northeast winds to 25 knots. Wind waves 7 feet. Northwest swell 8 feet. Isolated showers.
Thursday night..Northeast winds to 25 knots. Wind waves 8 feet. Northwest swell 6 feet. Scattered showers.
Friday..Northeast winds 20 knots. Wind waves 8 feet. Northwest swell 5 feet. Scattered showers.
Friday night..Northeast winds 15 knots. Wind waves 4 feet. North swell 5 feet. Scattered showers.
Saturday..Winds variable less than 10 knots. Wind waves 3 feet. North swell 4 to 5 feet. Scattered showers.
Sunday..South winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Northwest swell 4 to 5 feet. Scattered showers.
PHZ100 947 Pm Hst Tue Dec 12 2017
Synopsis for hawaiian coastal waters.. A large northwest swell building this evening will peak Wednesday, then subside through Friday. A front over the maui county waters this evening will move southeast of the big island and dissipate Wednesday. A ridge will build northwest of the area Wednesday night. A trough will form east of the area Thursday, then move west through the weekend.

7 Day Forecast for Marine Location Near Lanai City, HI
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location: 20.78, -157     debug


Area Discussion for -
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Fxhw60 phfo 130648
afdhfo
area forecast discussion
national weather service honolulu hi
848 pm hst Tue dec 12 2017

Synopsis
A dissipating cold front located over the southeast portion of
the state will shift east of the big island through the day
Wednesday. Gusty north-northeast winds with cool and dry
conditions will fill in behind the front Wednesday through
Thursday, with unsettled weather possible Friday through the
weekend.

Discussion
The latest hi-res model guidance remains in good agreement tonight
through midweek and shows the frontal boundary over maui county
shifting east of the big island by Wednesday night. Clouds and
showers along and ahead of this boundary will remain possible
through this time. Rainfall accumulations, however, will remain on
the light side as the front continues to dissipate as it moves
through. The latest rainfall summary across the state over the
past 24 hrs reflects this with peak amounts around and just over
an inch on kauai, less than three quarters of an inch on oahu, and
up to a quarter of an inch through 8 pm hst this evening for maui
county.

Drier and cooler air will fill in (pws down toward half of an inch;
dewpoints into the mid upper 50s) behind this front overnight
through midweek. North-northeast will become gusty Wednesday
through Thursday (potentially reaching wind advisory levels for
some of the typically windier areas with this flow come Thursday).

Changes in the weather are afoot late in the week as global models
are consistently depicting an upper level low dropping south as it
cuts off from the jet stream to the north, reaching a position
northeast of the islands Friday. The upper low will bring
instability and cold temperature to the middle and upper atmosphere
allowing for increasing rainfall chances, and heavier showers. Near
the surface, a low is expected to form east of the state in response
to the upper low. The instability aloft, low pressure near the
surface, and increasing low level moisture will lead to unsettled
weather over the islands with the possibility of heavy rain and
thunderstorms, and the chance of snow for the big island summits.

However, models are still having a difficult time agreeing with
the location of the upper low and the timing of how long the low
stays in the island's vicinity. The current forecast has
increasing showers and rainfall totals Thursday night through
Saturday. We will likely introduce a slight chance of thunderstorms
to the forecast starting Friday over the eastern windward waters as
the upper low will mostly likely bring instability over those areas.

More fine tuning will continue as the details become clearer as
model solutions converge.

Aviation
A weakening cold front over the central islands will continue to
move down the island chain overnight and early Wednesday morning.

Airmet sierra remains in effect for mountain obscuration for oahu,
molokai and lanai, and has begun for maui. Low cloud coverage is
already on the decline over oahu, and anticipate that the airmet
there will be canceled in the next few hours. Anticipate
conditions improving over maui county during the second half of
the night. The frontal band is expected to reach the big island
during late tonight or early Wednesday morning, and depending on
how much of it hangs together, an airmet may be needed there.

Northerly winds pick up a bit behind this front, but at this time
do not anticipate any significant low level turbulence.

Marine
A high surf warning is in effect for north and west facing shores
of most islands with a high surf advisory for north facing shores
of the big island of hawaii. The swell height this evening at buoy
51101, about 350 miles northwest of honolulu, had reached over 19
feet, and had built over 10 feet at the kauai buoy. This north
northwest swell will peak Wednesday, remain quite large on Thursday,
then subside through Saturday.

North winds are spreading over the hawaiian coastal waters behind
a dissipating front near maui. Wind speeds are below the 25 knot
small craft advisory (sca) threshold this evening, but a SCA is in
effect for most waters due to large seas associated with the north
northwest swell. Wind speeds will increase as high pressure builds
northwest of the area and a trough forms to the east. Winds will
reach SCA levels across much of the area by Wednesday evening and
peak with near-gale force winds in the windier areas around the
big island and maui county on Thursday. Winds will subside Friday
into Saturday as the trough approaches from the east.

See the collaborative surf discussion for details on surf and
swell.

Hfo watches warnings advisories
High surf warning until 6 pm hst Thursday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala.

High surf advisory until 6 pm hst Thursday for big island north
and east.

Small craft advisory until 6 am hst Friday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-oahu leeward waters-kaiwi channel-maui
county windward waters-maui county leeward waters-pailolo
channel-alenuihaha channel-big island windward waters.

Aviation... M ballard
marine... Donaldson
rest of discussion... Gibbs morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 29 mi47 min NNW 13 G 15 74°F 77°F1015.1 hPa
51205 35 mi29 min 78°F8 ft
51202 - Mokapu Point, HI (098) 57 mi55 min 77°F9 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI3 mi63 minN 1010.00 miOvercast66°F63°F90%1015.2 hPa

Wind History from HNY (wind in knots)
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Last 24hrS5S5S5SW6SW5--S3SW6SW8SW10W11SW11W10SW11W12W12
G17
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W5N4N9N15N13N11N10
1 day agoSE7NE6NE7E6E6E4E5E6SE7S6S7SW8W9SW10SW9SW11SW9S6CalmCalmE3E4E4E3
2 days agoN9NE10NE8NE10NE14E6E9E7E9E7S5SE9E5SE5S6W5W3CalmE3E4E3NE3NE4E6

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Wed -- 01:40 AM HST     1.99 feet High Tide
Wed -- 03:05 AM HST     Moonrise
Wed -- 06:55 AM HST     Sunrise
Wed -- 08:00 AM HST     0.61 feet Low Tide
Wed -- 12:43 PM HST     1.33 feet High Tide
Wed -- 03:02 PM HST     Moonset
Wed -- 05:48 PM HST     Sunset
Wed -- 07:02 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
1.71.921.81.51.20.90.70.60.70.91.11.31.31.210.60.30-0.100.30.71.2

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Wed -- 01:04 AM HST     1.96 feet High Tide
Wed -- 03:04 AM HST     Moonrise
Wed -- 06:54 AM HST     Sunrise
Wed -- 07:20 AM HST     0.75 feet Low Tide
Wed -- 12:07 PM HST     1.32 feet High Tide
Wed -- 03:01 PM HST     Moonset
Wed -- 05:47 PM HST     Sunset
Wed -- 06:20 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
1.921.91.71.41.10.90.80.80.91.11.21.31.31.10.80.50.20.10.10.30.71.11.5

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 (5,6,7,8)
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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.