Sunday, October22, 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 6:23AMSunset 5:57PM Saturday October 21, 2017 8:10 PM HST (06:10 UTC) Moonrise 8:07AMMoonset 7:45PM Illumination 4% 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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PHZ118 Maui County Leeward Waters- 346 Pm Hst Sat Oct 21 2017
Tonight..East winds 15 knots. Wind waves 5 feet. North swell 3 feet. Isolated showers through the night.
Sunday..East winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 feet in the morning then 2 feet or less. Northwest swell 3 feet. Haze through the day. Isolated showers through the day.
Sunday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 5 feet. Haze. Scattered showers.
Monday..Winds variable less than 10 knots becoming south 15 knots in the afternoon. Wind waves 4 feet. Northwest swell 5 feet. SWell south 3 feet. Haze through the day. Heavy showers likely in the morning. Isolated Thunderstorms through the day. Occasional heavy showers in the afternoon.
Monday night..South winds 15 knots. Wind waves 5 feet. Mixed swell northwest 4 feet and south 3 feet. Haze through the night. Occasional heavy showers in the evening. Isolated Thunderstorms through the night. Showers likely, some heavy, after midnight.
Tuesday..West winds 15 knots veering north in the afternoon. Wind waves 4 feet. Mixed swell northwest 5 feet and south 3 feet. Haze in the morning. Showers likely, some heavy, in the morning. Isolated Thunderstorms through the day. Scattered heavy showers in the afternoon.
Tuesday night..North winds 10 knots. Wind waves 3 feet. Northwest swell 7 feet. SWell south 3 feet. Scattered showers.
Wednesday..North winds 10 knots. Wind waves 3 feet. Northwest swell 7 to 8 feet. Scattered showers.
Thursday..North winds 10 knots. Wind waves 2 feet or less. Northwest swell 5 to 7 feet. Isolated showers.
PHZ100 346 Pm Hst Sat Oct 21 2017
Synopsis for hawaiian coastal waters.. A subtropical ridge north of the area will push south over the islands on Sunday, quickly weakening the trades and turning our winds more toward the southeast. Kona winds from southerly directions will develop on Monday as a cold front approaches the islands. The front will push down the chain early in the week, accompanied by heavy showers and a chance of Thunderstorms. Strong, gusty, erratic winds could accompany these storms. Winds will switch to moderate to fresh northerlies after the passage of the front.

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 220153
afdhfo
area forecast discussion
national weather service honolulu hi
353 pm hst Sat oct 21 2017

Synopsis
Trade winds will diminish tonight with clouds and showers
remaining focused over windward and mauka areas. Sunday, light
and variable winds with afternoon clouds and sea breezes are
expected. Some heavier showers over the eastern half of the big
island are possible Sunday afternoon and night. Monday through
Wednesday, southerly winds ahead of a front will bring deep
tropical moisture with the potential for flooding for mainly the
eastern half of the state. Cool and dry air will fill in behind
the front.

Discussion
Trade will diminish tonight with showers relegated to mainly
windward areas. By Sunday, a front approaching from the northwest
will push a surface ridge over the islands allowing for light and
variable winds over the smaller islands with widespread afternoon
sea breezes and interior clouds and showers. Near and over the big
island, southeasterly winds will bring increasing humidity and
moisture from the tropics allowing for heavier showers starting
Sunday and continuing Sunday night, mainly over the kau, puna, and
hilo districts.

As the front approaches kauai Sunday night and Monday, both the
gfs and ECMWF are depicting a moisture convergence band forming
over oahu, maui county, and the big island. The near surface
convergence, tropical moisture, and island terrain will likely produce
heavy rain, isolated thunderstorms, and the potential of flash
flooding for areas of the eastern islands through Tuesday.

Sufficient deep layer shear, as well as turning of the winds with
height in the lower levels, suggest that some of those isolated
thunderstorms could be strong or severe along and ahead of the
front.

Kona winds (southerly) will increase Monday with some potential
for gusty winds accelerating down the terrain into windward areas
of kauai and oahu. The front will push over kauai Monday night
bringing moderate rain with the heaviest falling over the north
and west facing slopes of the garden isle. The front will push the
aforementioned convergence band slowly eastward, likely pushing
east of oahu Tuesday, and then east of the big island sometime
Wednesday. North winds behind the front will bring cool and dry
conditions to kauai Tuesday, and possibly oahu Wednesday; while
the convergence band keeps things moist and humid over maui county
and the big island.

Model guidance is a bit cloudy for the second half of the week
with the GFS maintaining a weak trough east of the state, while
the ECMWF places a stronger surface low southeast of the big
island. The forecast maintains light to moderate northeast trade
winds with windward showers in the extended forecast.

Aviation
Moderate to breezy trade winds will trend down this evening as a
ridge of high pressure approaches the islands from the north.

Airmet tango for low level turbulence downwind of the mountains on
all islands will likely be canceled later this evening.

Ragged clouds and scattered showers will persist along windward
slopes and coasts overnight. Partial clearing is expected across
leeward slopes and coasts after sunset once weak sea breezes
abate. Isolated MVFR cig vis are to be expected in passing
showers this afternoon may become more frequent across windward
big island late tonight. Otherwise,VFR conditions will prevail
all areas.

Marine
Trade winds continue to gradually diminish but are still blowing
in the moderate to fresh breeze range across the coastal waters
this afternoon. Will be discontinuing the small craft advisory as
we should see winds will drop off overnight and start turning se
as a subtropical ridge near 30n pushes rapidly S over the islands
on Sunday. Kona winds from southerly directions will then take
over and increase by Monday as a developing gale low gets cranking
600 nm or so to our n. Some of the guidance suggests that
prefrontal konas might approach SCA levels on Monday or Monday
night, something we will need to keep an eye on. There will also
be fresh northerlies immediately behind the cold front as it
pushes down the coastal waters from NW to SE Monday night and tue,
and these could also approach SCA criteria in some spots before
the low starts to move away in the midweek time frame.

Deep tropical moisture drawn northward ahead of the front is
expected to lead to some thunderstorms over the coastal waters
starting early Monday, mainly from around oahu eastward.

Sufficient deep layer shear, as well as significant turning of
the winds with height in the lower levels, suggest that a couple
of the storms could be strong or severe along and ahead of the
front.

Although short-period wind waves will continue to ease, building
nnw and S swells Sunday and Monday are expected to keep combined
seas elevated, but below the SCA criteria of 10 feet. A larger,
shorter-period nnw swell building on Tuesday will likely lead to
sca in all zones as seas exceed 10 feet once again. The first nnw
swell will produce surf near the advisory threshold along exposed
n facing shores, and the second swell is expected to produce high
surf along N facing shores. Advisory-level surf along S facing
shores is possible Sunday and Monday, with the swell generated by
a distant low near new zealand last weekend. A small long-period w
swell is possible next week, generated by large and slow-moving
super typhoon lan in the W pacific. An even larger, possibly
warning level NW swell is possible late in the week as lan becomes
extratropical in the NW pacific. The GFS and ECMWF are in good
agreement on the evolution of this feature and the fetch
generation area. SE swell is also possible over the next several
days. The recently updated oahu surf discussion (srdhfo) has
details on the swell sources affecting the islands.

Hfo watches warnings advisories
None.

Morrison... Discussion
rballard... Marine
bedal... Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 29 mi41 min NE 8 G 13 76°F 79°F1016.6 hPa
51202 - Mokapu Point, HI (098) 57 mi37 min 80°F7 ft

Wind History for Kahului, Kahului Harbor, HI
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NE7
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G31
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI3 mi15 minNNE 1210.00 miFair72°F66°F84%1016.3 hPa

Wind History from HNY (wind in knots)
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Last 24hrNE15
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5NE13E7NE17NE14NE9NE5E10NE10E76NE12
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CalmE6NE13
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1 day agoE19
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2 days agoNE13
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E11NE9N4SE6NE12NE12E15
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Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Sun -- 05:36 AM HST     2.28 feet High Tide
Sun -- 06:26 AM HST     Sunrise
Sun -- 08:57 AM HST     Moonrise
Sun -- 12:31 PM HST     0.44 feet Low Tide
Sun -- 05:24 PM HST     1.20 feet High Tide
Sun -- 05:58 PM HST     Sunset
Sun -- 08:26 PM HST     Moonset
Sun -- 11:00 PM HST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.71.11.622.22.32.11.71.30.90.60.50.50.60.81.11.21.210.80.50.30.2

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sun -- 05:01 AM HST     2.24 feet High Tide
Sun -- 06:24 AM HST     Sunrise
Sun -- 08:56 AM HST     Moonrise
Sun -- 11:51 AM HST     0.61 feet Low Tide
Sun -- 04:49 PM HST     1.22 feet High Tide
Sun -- 05:56 PM HST     Sunset
Sun -- 08:25 PM HST     Moonset
Sun -- 10:18 PM HST     0.39 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.11.51.92.12.22.11.91.51.20.90.70.60.70.911.21.21.110.70.50.40.4

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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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.