Friday, June22, 2018 L-36.com


Marine Weather and Tides
Lahaina, HI

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:45AMSunset 7:11PM Friday June 22, 2018 12:57 AM HST (10:57 UTC) Moonrise 2:44PMMoonset 2:00AM Illumination 66% Phase: Waxing Gibbous; Moon at 9 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- 900 Pm Hst Thu Jun 21 2018
.small craft advisory in effect through Sunday afternoon...
Rest of tonight..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds to 25 knots. Wind waves 3 feet. Isolated showers in the morning.
Friday night..North winds to 25 knots. Wind waves 4 feet.
Saturday..North winds to 25 knots. Wind waves 4 feet.
Saturday night..North winds to 25 knots. Wind waves 3 feet.
Sunday..North winds to 30 knots. Wind waves 4 feet.
Sunday night..North winds to 25 knots. Wind waves 4 feet.
Monday..North winds to 25 knots. Wind waves 3 feet.
Tuesday..Northeast winds to 25 knots. Wind waves 3 feet. Isolated showers.
PHZ100 900 Pm Hst Thu Jun 21 2018
Synopsis for hawaiian coastal waters.. A high far northwest of the area will move east and strengthen through the weekend. The high will move away to the northeast early next 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 220642
afdhfo
area forecast discussion
national weather service honolulu hi
842 pm hst Thu jun 21 2018

Synopsis
A moderately strong high pressure system is slated to pass north
of the islands over the weekend, resulting in a boost in the trade
winds to breezy. This ramping up of the trades will be accompanied
by an increase in trade showers, where the lee side of the smaller
islands may experience some passing showers. Leeward big island
will have some scattered showers each afternoon and evening for
the coming days.

Discussion
The strengthening trades is being brought on by an approaching
surface high now located 1750 miles northwest of kauai. It has a
central pressure of 1027 mb, and is forecast to strengthen to 1035
mb when it passes some 1200 miles north of the islands Saturday
and Saturday night. The trades will strengthen to widespread
moderate to strong speeds by Friday night that will warrant an
expansion of the small craft advisory, and possibly a limited
wind advisory to the notoriously windy areas such as the kohala
mountains area and lanai. But we will see. The trades are slated
to tone down slightly, to moderate to locally strong on Sunday
night. Another round of breezy trades may resumes on Tuesday night
as this same high makes a turn to the south and southwest, back
toward the islands.

The forecast package was updated earlier this evening to reflect
the drier conditions. The islands, especially windward maui and
windward big island, should be getting more showery after
midnight. All islands should be under a wetter trade wind pattern
by this time tomorrow, lasting through Sunday.

The upper low currently 830 miles east-northeast of the big
island, continues to move westward. The ECMWF and GFS models are
in good agreement in the track of this low, where they take it
northward after reach 150w longidtude Saturday evening.

The GFS solution is has the marine layer at 10k area wide tonight,
lifting higher to 14k feet over the big island by Friday
afternoon. It remains in the 10 to 14k foot range to Sunday when
a sharper inversion settles in at 8k feet across the smaller
islands, to 10k feet over the big island, thanks to a mid level
ridge. Although we may see a slight drop off in the trade showers
at this time, Sunday night, orographic influence, will still
maintain a wet trade pattern.

Aviation
Trade winds will be strengthening through the evening and
nighttime hours as high pressure builds far northeast of the state.

Vfr will prevail over most sections of the individual isles, with
brief MVFR conditions possible in windward and mauka areas in
passing showers.

No airmets are currently posted. However, one for low level
turbulence will likely be needed by Friday as trades continue to
increase.

Marine
A 1028 high about 1400 nm northwest of the main hawaiian islands
is forecast to move east at 20 kt. The high will build to 1035 mb
as it reaches a point about 1000 nm north of the area Saturday
night. The pressure gradient near the main hawaiian islands is
already tight enough to produce locally strong easterly trade
winds. A small craft advisory (sca) is in effect through Sunday
for the waters around the big island and maui county exposed to
the strong trades. As the high builds north of the area over the
weekend, trade winds will strengthen further. Wind speeds may
reach near-gale force in maalaea bay and the alenuihaha and
pailolo channels as early as Friday and the SCA will likely be
extended to include most areas of the coastal waters. As the high
moves farther east early next week, wind speeds will gradually
subside.

Surf will gradually build along east facing shores as trade winds
strengthen, but is expected to remain below the advisory
threshold. Surf will remain small along other shores with no
significant swells through the weekend. A pair of swells from
southeast of new zealand will reach the area next week. The first
swell is expected to peak Wednesday and the second on Thursday.

Surf along south facing shores may reach advisory levels.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Sunday for maalaea bay,
pailolo and alenuihaha channels, waters south of the big island.

Lau kinel donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi46 min NE 12 G 16 77°F 82°F1016.5 hPa
51205 17 mi28 min 79°F5 ft
51213 19 mi58 min 80°F3 ft
51202 - Mokapu Point, HI (098) 65 mi54 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI13 mi64 minENE 12 G 1610.00 miFair74°F66°F79%1016.9 hPa
Lanai City, Lanai Airport, HI16 mi62 minNNE 1210.00 miFair70°F64°F84%1016.6 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE7NE10NE10NE15NE15NE12NE14
G20
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1 day ago------------------------E6NE8NE10NE12NE15NE15NE15
G21
SW563NE14
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2 days ago------------------------E9NE8NE12E10NW1055SW8W104SW8SW9

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 02:00 AM HST     Moonset
Fri -- 05:22 AM HST     -0.06 feet Low Tide
Fri -- 05:46 AM HST     Sunrise
Fri -- 12:43 PM HST     1.82 feet High Tide
Fri -- 02:44 PM HST     Moonrise
Fri -- 06:58 PM HST     0.67 feet Low Tide
Fri -- 07:10 PM HST     Sunset
Fri -- 11:35 PM HST     1.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.210.70.40.1-0-00.20.50.91.31.61.81.81.71.51.20.90.70.70.70.911.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 01:59 AM HST     Moonset
Fri -- 04:52 AM HST     0.09 feet Low Tide
Fri -- 05:45 AM HST     Sunrise
Fri -- 12:05 PM HST     1.74 feet High Tide
Fri -- 02:43 PM HST     Moonrise
Fri -- 05:34 PM HST     1.07 feet Low Tide
Fri -- 07:10 PM HST     Sunset
Fri -- 10:24 PM HST     1.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.310.70.40.20.10.20.40.81.11.41.71.71.71.51.41.21.11.11.21.31.51.51.5

Weather Map and Satellite Images
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GOES Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for (6,6,7,8)
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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.