Thursday, November23, 2017 L-36.com


Marine Weather and Tides
Lahaina, 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 6:40AMSunset 5:44PM Thursday November 23, 2017 5:55 PM HST (03:55 UTC) Moonrise 10:53AMMoonset 10:16PM Illumination 29% Phase: Waxing Crescent; Moon at 5 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- 340 Pm Hst Thu Nov 23 2017
.small craft advisory in effect through Sunday afternoon...
Tonight..North winds to 25 knots. Wind waves around 4 feet.
Friday..North winds to 25 knots. Wind waves around 3 feet.
Friday night..North winds to 25 knots. Wind waves around 4 feet.
Saturday..North winds to 25 knots. Wind waves around 4 feet.
Saturday night..North winds to 30 knots. Wind waves around 3 feet.
Sunday..North winds to 30 knots. Wind waves around 3 feet. Isolated showers in the afternoon.
Sunday night..North winds to 25 knots. Wind waves around 3 feet. Isolated showers.
Monday..North winds to 25 knots. Wind waves around 7 feet. Scattered showers.
Tuesday..North winds to 25 knots. Wind waves around 5 feet. Isolated showers.
PHZ100 340 Pm Hst Thu Nov 23 2017
Synopsis for hawaiian coastal waters.. Strong high pressure will remain north of the area through early next week. A large north swell will slowly subside through the end of the week.

7 Day Forecast for Marine Location Near Lahaina, HI
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location: 20.88, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 240138
afdhfo
area forecast discussion
national weather service honolulu hi
338 pm hst Thu nov 23 2017

Synopsis
High pressure north of the state will keep breezy to windy trades
blowing through the holiday weekend. Passing showers will favor
windward and mauka areas, with a stray shower reaching leeward
areas from time to time due to the strength of the trades. A wet
trade wind pattern is expected to develop on Sunday and continue
through early next week, as deep tropical moisture moves into the
area from the southeast. The wettest conditions are expected over
the eastern end of the island chain.

Discussion
Currently at the surface, a 1034 mb high centered around 1350
miles north-northwest of honolulu, is driving breezy to windy
trades across the island chain this afternoon. Satellite imagery
shows mostly cloudy skies across most windward areas, and
generally partly cloudy conditions in leeward locales. Radar
imagery shows scattered showers moving into windward areas, with
a few showers reaching leeward areas from time to time. Main
short term concerns revolve around the rain chances and the
strong trade winds.

Tonight through Sunday,
breezy to windy trades will continue right through the holiday
weekend, as the strong area of high pressure to the north-
northwest of the state gets re-enforced by another strong high
dropping southward from the aleutian islands. Clouds and showers
will continue to favor windward and mauka areas through the
period, with a stray shower reaching leeward areas from time to
time. Both the GFS and ECMWF show deep tropical moisture lifting
northwestward into the eastern end of the island chain on Sunday,
and this is expected to bring a particularly wet trade wind
pattern to maui county and the big island. Showers are also
expected to increase across kauai and oahu, but coverage and
intensity shouldn't be as high as over the eastern end of the
state.

Additionally, with deep moisture moving into the big island, snow
may begin to affect the big island summits as early as Sunday.

The wind advisory for areas over and downwind of the kohala
mountains on the big island, as well as the island of lanai
remains in effect through 6am Friday. The strong winds are
expected to drop off slightly on Friday, and the thought for now
is that the winds will remain just below advisory levels.

Nevertheless, we can't entirely rule out the need to extend the
advisory through the day on Friday for the areas where it
currently is in effect, but will let the night shift watch
observational trends and make the decision on whether to extend
the advisory or not.

With the re-enforcing high building north of
the state, advisory level winds may periodically affect the
typically windier locations on maui and the big island right
through the weekend.

Sunday night through next Thursday,
high pressure north of the state will keep a moderate to breezy
trade wind flow in place through the period. Model solutions are
in good agreement showing deep moisture lingering over the eastern
end of the state through the first half of next week, so a wet
trade wind pattern is expected over maui county and the big
island. Across oahu and kauai, a wetter than normal trade wind
weather pattern is expected to prevail, with shower coverage
expected to be the highest Sunday night and Monday. This will need
to be monitored closely however, as it could be significantly more
wet if the slug of deeper moisture lifts further northward than
currently anticipated.

Model solutions suggest that snow will continue to affect the big
island summits Sunday night through at least Tuesday. Although
it's too early to determine how much snow may fall, warning level
amounts appear to be a decent probability, and if these trends
continue a winter storm watch will likely be required later this
weekend.

Aviation
Trade winds will remain strong through the weekend. Airmet tango
remains in effect for moderate low level turbulence over and
downwind of the higher terrain due to the strong winds. Airmet
tango is also in effect for strong surface wind speeds for
portions of lanai and the big island.

Cloud and showers will be most prevalent over windward areas, and
airmet sierra for mountain obscuration is currently in effect for
windward parts of molokai, maui and the big island, where the
showers have been particularly persistent. While some of the
showers will reach leeward areas at times due to the strengthening
trades, expectVFR conditions to prevail there.

Marine
The very large north swell continues to come in above the models,
particularly near the big island. Throughout the day, the buoy
near hilo has reported 16+ ft at 15 seconds. The latest model run
has come closer to reported values near kauai, but still is below
reported values near the big island. Have tweaked the existing
forecast to bump numbers up a bit, primarily near the big island.

The hanalei buoy has been picking up 13 second energy over the
last couple of hours, so suspect we have, or are seeing the start
of the decline of the swell.

The high surf warning continues for north and east facing shores
due to the swell. The warning GOES through 6 am Friday morning,
but surf is still expected to be high, necessitating a high surf
advisory for Friday.

This swell is also bringing seas in excess of 10 ft, and when
combined with the strong and gusty northeast winds, necessitates
the small craft advisory (sca) that remains in effect. With a
combination of winds and seas meeting SCA criteria expected to
continue into the weekend, the SCA has been extended for most
zones. The few areas not in the extension may need to be added
when the next swell arrives Sunday and Monday.

A new north swell is expected to arrive Sunday, peaking Monday
near advisory levels, then subsiding through Tuesday. Additional
swells are expected to arrive Wednesday.

See the latest oahu surf discussion (srdhfo) for additional
details on surf and swell.

Hfo watches warnings advisories
High surf warning until 6 am hst Friday for niihau-kauai
windward-kauai leeward-oahu north shore-oahu koolau-olomana-
molokai-maui windward west-maui leeward west-maui central valley-
windward haleakala-big island north and east.

Wind advisory until 6 am hst Friday for lanai-big island north
and east-kohala.

Small craft advisory until 6 pm hst Sunday 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-maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Small craft advisory until 6 am hst Saturday for big island
windward waters.

Discussion... Jelsema
aviation... Foster
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi44 min NNE 17 G 21 74°F 77°F1018.2 hPa
51202 - Mokapu Point, HI (098) 65 mi52 min 78°F12 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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N15
G20
NE12
G17
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G21
NE12
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G23
NE10
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NE4
G9
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NE12
G22
NE14
G19
N15
G20
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NE18
G23
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G24
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G23
N21
G26
NE18
G27
NE20
NE18
G24
N17
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ago
NW9
NW7
SE2
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E5
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NW6
N6
G9
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W5
NW10
S1
W2
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N6
G10
NW8
G11
NW6
NE9
G12
E9
G15
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G12
NE8
G11
NE6
G9
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ago
NW3
SE2
NE3
W4
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NW7
G10
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NW9
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G11
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N10
G14
NE13
G17
N11
G17
N10
G14
N8
G11
N8

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi71 minNNE 16 G 2110.00 miLight Rain68°F62°F83%1017.6 hPa
Kahului, Kahului Airport, HI13 mi62 minNNE 1610.00 miPartly Cloudy73°F64°F74%1018.3 hPa
Lanai City, Lanai Airport, HI16 mi60 minNE 27 G 3510.00 miFair and Windy68°F60°F76%1015.7 hPa

Wind History from HJH (wind in knots)
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Last 24hrN15------------------------NE13N11
G22
N16
G26
N14
G24
--N16
G26
NE24
G33
NE18
G25
NE17
G24
NE21
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NE16
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1 day agoNE10------------------------E10NE11NE13NE10NE18NE16NE15N17NE18
G22
N15
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NE18
G23
2 days agoNE10------------------------NE10NE10--NE10N13NE14N13N13N15NE17NE15

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 06:39 AM HST     2.17 feet High Tide
Thu -- 06:42 AM HST     Sunrise
Thu -- 10:53 AM HST     Moonrise
Thu -- 02:29 PM HST     0.48 feet Low Tide
Thu -- 05:44 PM HST     Sunset
Thu -- 07:28 PM HST     0.89 feet High Tide
Thu -- 10:16 PM HST     Moonset
Thu -- 11:30 PM HST     0.60 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.711.41.722.12.221.81.51.10.80.60.50.50.60.70.80.90.90.80.70.6

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 05:40 AM HST     2.28 feet High Tide
Thu -- 06:41 AM HST     Sunrise
Thu -- 10:52 AM HST     Moonrise
Thu -- 01:05 PM HST     1.08 feet Low Tide
Thu -- 03:28 PM HST     1.12 feet High Tide
Thu -- 05:43 PM HST     Sunset
Thu -- 10:15 PM HST     Moonset
Thu -- 10:18 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.91.31.72.12.22.32.21.91.71.41.21.11.11.11.11.11.10.90.80.60.40.30.3

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 (22,6,7,8)
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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.