Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Lahaina, HI

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:13AMSunset 6:25PM Wednesday September 19, 2018 6:18 AM HST (16:18 UTC) Moonrise 3:14PMMoonset 1:43AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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- 330 Am Hst Wed Sep 19 2018
Today..North winds 10 knots backing west in the afternoon. Wind waves 2 feet or less. Isolated showers in the afternoon.
Tonight..Northwest winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Thursday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Thursday night..North winds 20 knots. Wind waves 3 feet in the evening then 2 feet or less. Isolated showers.
Friday..North winds to 25 knots. Wind waves 3 feet in the morning then 2 feet or less. Isolated showers through the day.
Friday night..North winds to 25 knots. Wind waves 3 feet in the evening then 2 feet or less.
Saturday..North winds 15 knots. Wind waves 2 feet or less.
Sunday..North winds 15 knots. Wind waves 2 feet or less.
PHZ100 330 Am Hst Wed Sep 19 2018
Synopsis for hawaiian coastal waters.. A weak surface trough will move from east to west across the coastal waters over the next day or two, weakening the winds. High pressure will then rebuild far northeast of the area in the latter part of the week and this weekend.


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 191334
afdhfo
area forecast discussion
national weather service honolulu hi
334 am hst Wed sep 19 2018

Synopsis
Trade winds will remain light over portions of the state through
Thursday as a weak trough moves through the region. Warm and
muggy conditions will be likely today due to light winds and
increasing moisture, which should translate to increasing rainfall
chances. A drying trend with breezy trades returning are expected
Thursday night into the weekend.

Discussion
A surface trough near the big island and extending north to 30n is
moving westward across the area this morning, causing winds to
decrease and swing to east southeasterlies across the smaller
islands. Blocking from the big island will further decrease winds
across the smaller islands through Thursday.

Along with light winds, expect wetter weather beginning this
morning and continuing through Thursday evening as the trough
moves through the islands. Overnight soundings show our airmass
becoming more moist versus yesterday afternoon, with pw values
between 1.23 and 1.40 inches, along with neutral stability.

Satellite derived pw shows values 2.0 inches and higher just east
and northeast of the state this morning. Conditions will feel
warmer and more humid today as this moist air spreads westward.

Local sea breezes will set up across leeward sections of the
smaller islands each afternoon today and Thursday as big island
blocking continues. Pops will increase from east to west through
the day today as the trough and associated moisture move through
the state. Dew points will climb into the low to mid 70s as well.

Models show drier air and moderate trades will return Thursday
night into Friday as the trough shifts to the west. Expect this
trend to hold into into early next week, with clouds and showers
focusing over windward and mauka areas.

Aviation
Winds have weakened and veered to the SE overnight, placing most
islands in a light wind regime. This has allowed land breezes to
develop, leading to mostly clear skies over the islands. The se
flow will bring increasing low-level moisture over the next 24
hours, spreading NW to the smaller islands after reaching the big
island later today. Through the morningVFR conditions will prevail
statewide, with isol MVFR in shra over E and SE facing coasts and
slopes, and over the near shore waters. No airmets are expected
through the morning.

Sea breezes are expected to drive cloud formation over interior
areas of the islands this afternoon, but limited moisture should
limit shower coverage over the smaller islands. Light to moderate
e SE winds near the big island and maui combined with the increased
moisture will likely lead to increasing coverage of MVFR vis cig
later today, and may warrant the issuance of airmet sierra for
mountain obscuration.

Marine
With trade winds trending down as a weak surface trough
approaches from the east, the small craft advisory (sca) that had
been in effect was cancelled Tuesday afternoon. Winds are
expected to remain below SCA levels through Thursday, though they
will strengthen again during the latter part of the work week as
high pressure rebuilds behind the trough.

Surf is forecast to remain below advisory levels along all shores
for the next several days. A south swell is expected to peak
today near summer average, then slowly subside through Friday.

The current northwest swell is forecast to slowly fade through the
day. Choppy surf along east facing shores will build again after
the trough passes and the trade winds ramp up Thursday night and
beyond.

Hfo watches warnings advisories
None.

Discussion... Powell
aviation... Birchard
marine... Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi36 min Calm G 1 72°F 84°F1012.4 hPa
51205 17 mi18 min 80°F5 ft
51213 19 mi48 min 82°F3 ft
51202 - Mokapu Point, HI (098) 65 mi104 min 81°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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NE12
NE10
G14
NE8
G11
NE9
G13
NE10
G13
NE12
N13
G16
N11
G14
N11
N11
G14
N11
G14
N11
G14
NE10
NE7
G11
N7
N9
W8
G11
NW7
G11
NE4
NW7
NW8
SE3
SE3
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1 day
ago
NE12
G16
NE8
G14
NE16
G21
NE14
G17
NE14
G24
NE16
G22
NE14
G20
NE8
G23
NE16
G20
NE19
NE14
G19
NE17
E8
G16
NE8
G11
NE11
G15
E4
G9
NE8
G11
NE10
G14
NE9
G14
NE9
NE7
G10
NE8
G13
NE2
N6
G9
2 days
ago
N7
G11
NE14
G22
NE19
G24
NE18
G25
NE15
G20
NE17
G22
NE16
G20
NE13
G22
NE16
G22
NE15
G22
NE18
G24
NE16
G22
NE13
G19
NE16
G20
NE17
G21
NE12
G15
NE8
G12
NE4
G12
NE7
G10
NE11
G15
NE13
NE13
G16
NE10
G16
NE6
G14

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI13 mi24 minSE 510.00 miFair67°F64°F93%1013.3 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE10
G17
NE15NE13
G20
NE12
G24
NE10
G19
NE15NE10
G20
NE20NE10
G17
NE15NE10------------------------E8
1 day agoNE11NE12
G18
NE13
G18
NE18
G22
NE17
G24
NE17
G25
E11
G22
NE19
G26
NE14
G21
NE16NE14
G21
------------------------NE8
2 days agoNE14NE12
G23
NE13
G24
NE13
G24
NE14
G24
NE12
G25
NE13
G23
NE12
G22
NE14
G24
NE12
G23
--------------------------NE11

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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wmap_P
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (12,3,4,5)
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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.