Monday, March27, 2017 L-36.com


Marine Weather and Tides
Lahaina, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:22AMSunset 6:40PM Sunday March 26, 2017 6:43 PM HST (04:43 UTC) Moonrise 5:33AMMoonset 5:41PM Illumination 0% Phase: New Moon; Moon at 29 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- 331 Pm Hst Sun Mar 26 2017
.small craft advisory in effect through early Monday morning...
Tonight..North winds to 25 kt. Wind waves 2 ft or less.
Monday..North winds 15 kt. Wind waves 2 ft or less.
Monday night..North winds 15 kt. Wind waves 2 ft or less.
Tuesday..Northeast winds 20 kt. Wind waves 2 ft or less.
Tuesday night..Northeast winds 20 kt. Wind waves 2 ft or less.
Wednesday..Northeast winds 20 kt. Wind waves 2 ft or less.
Wednesday night..Northeast winds 20 kt. Wind waves 2 ft or less.
Thursday..Northeast winds 20 kt. Wind waves 2 ft or less.
Friday..North winds 15 kt. Wind waves 2 ft or less.
PHZ100 331 Pm Hst Sun Mar 26 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the islands will shift east through midweek as a cold front passes far north of the state. A large west-northwest swell is expected to enter the area late on Thursday.

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 270204
afdhfo
area forecast discussion
national weather service honolulu hi
404 pm hst Sun mar 26 2017

Synopsis
A persistent ridge of high pressure northeast of the islands will
keep trade winds blowing through next weekend, with locally breezy
levels expected through tonight. A dry and stable airmass will
keep showers limited and confined primarily to windward slopes
through the first half of the work week. An increase in trade wind
showers is then expected Wednesday through next weekend as upper
level troughing sets up over the island chain.

Discussion
Currently at the surface, a 1028 mb high centered around 1100
miles northeast of honolulu, is driving moderate to breezy trade
winds across the state this afternoon. Mimic total precipitable
water (pw) imagery shows a dry airmass over and upstream of the
islands, with pw values right around 1 inch. This correlates
fairly well with the 00z soundings from phto and phli which came
in with pw values of 0.86 and 0.95 inches respectively.

Additionally both afternoon soundings showed a stable airmass
firmly encompassing the island chain, with sharp low level
inversions between 4 and 6 kft. Visible satellite imagery shows
scattered low clouds drifting into windward areas, with partly
cloudy to mostly clear conditions in leeward areas with the
exception of the big island. Meanwhile, radar imagery shows a few
light showers moving into windward sections of maui and over
leeward sections of the big island, with rain free conditions
prevailing elsewhere. Main short term concern continues to focus
around the ongoing high surf headlines.

Tonight through Tuesday night,
high pressure northeast of the islands will keep a fairly tight
pressure gradient in place across the islands tonight, with
moderate to breezy trades expected. The trade wind speeds are
expected to drop off a notch Monday through mid week, as high
pressure lifts further northeast and away from island chain. A dry
and stable airmass is expected to keep shower activity light
through the period, with pw values remaining around 1 inch.

Showers will favor windward and mauka areas, primarily during the
overnight and early morning hours.

Wednesday through Saturday,
model solutions are in good agreement showing high pressure
remaining anchored well to the northeast of the state through the
period, with a weakening front approaching from the northwest late
in the week. Light to moderate trades are expected through the
end of the work week, with localized sea breezes possible,
particularly across the western islands where the pressure
gradient won't be as tight. The trades are then expected to
increase back to moderate and locally breezy levels over the
weekend as a re-enforcing area of high pressure north of the
island chain, tightens the pressure gradient once again. Aloft, a
weakness in the upper level ridge is expected to move overhead
during the middle and latter part of the week, and this should de-
stabilize the airmass a bit. This in combination with increasing
boundary layer moisture resulting from the persistent easterly
trades, should lead to an increase in trade wind showers across
the islands. Showers will continue to favor windward and mauka
areas, with activity most prevalent during the overnight and
early morning hours.

Aviation
Airmet tango for low level turbulence over and immediately south
through west of the mountains will continue through tonight. Winds
should drop off a notch tomorrow as the high pressure northeast
of the state moves further east. The airmet will need to be
reevaluated tomorrow.

The afternoon sounding from phto shows a very weak inversion near
2 kft with a stronger inversion up near 6 kft. The phli sounding
shows the inversion sloping down to near 4 kft.

Scattered clouds and isolated light showers will continue to
favor windward and mountain areas. Expect prevailingVFR
conditions through the night with only brief MVFR CIGS likely in
passing clouds and showers.

Marine
The large west-northwest swell continues to slowly subside this
afternoon as offshore buoys northwest of kauai report swells at
10 to 11 feet with 15 to 16 second periods. The local pacioos
buoys at hanalei, kauai and waimea report this swell at 8 to 10
feet with 17 seconds periods from a direction of 300 to 310. The
results have been teetering on the advisory/warning threshold all
day at north facing shores of kauai... Niihau and oahu and the west
facing shores of kauai... Niihau and the big island. Since the
trend is downward, the high surf warnings will become high surf
advisories tonight.

Hazardous boating and beach conditions will continue into Monday
before trending downward into mid week due to a combination of
fresh to strong trade winds and the large west-northwest (wnw;
300-310 deg) swell. The small craft advisory for all hawaiian
waters due to winds (25 to 30 kts, strongest in the channels)
and/or seas (10 ft or greater) will incrementally be removed
Monday through Tuesday as seas fall below 10 feet and the winds
subside below 25 knots.

Surf along east facing shores will remain small and choppy
through the upcoming week due to moderate to strong onshore winds
persisting.

Some areas along south facing shores have experienced a slight
increase in surf this afternoon due to the previously discussed
wnw swell wrapping around the islands. A slight increase in surf
along south facing shores is possible Thursday through Saturday
due to a long-period swell (190 deg) associated with recent
activity across the southern pacific.

For the outlook, another large long-period wnw (310 deg) swell
will be possible across the islands Thursday night through the
weekend. The latest guidance remains in decent agreement over the
next few days and depicts a storm-force low developing off the
coast of japan tonight into Monday, then tracking ene to the date
line Tuesday night into Wednesday while intensifying to around a
970 mb low. A large batch of gale- to storm- force westerly winds
focused toward the region through this time is forecast with seas
peaking within the 30 to 40 ft range. Swell across the islands
associated with this storm will likely lead to another period of
warning-level surf and advisory-level seas. More details will
follow this week as this system evolves and confidence increases
with regard to specifics on arrival times and impacts.

Hfo watches/warnings/advisories
High surf advisory until 6 pm hst Monday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui central valley-windward haleakala-kona-south
big island.

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

Small craft advisory until 6 am hst Monday for oahu leeward
waters-maalaea bay.

Discussion... Jelsema
aviation... Eaton
marine... Evans


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi44 min ENE 18 G 27 76°F 78°F1018.5 hPa (-0.0)
51205 17 mi35 min 76°F8 ft
51203 - Kaumalapau, HI (146) 19 mi29 min 79°F6 ft
51202 - Mokapu Point, HI (098) 65 mi40 min 76°F7 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
24hr
NE15
G23
NE14
G17
NE11
G16
NE11
G15
E11
G14
NE14
G21
N12
NE11
G17
NE16
G23
NE15
G21
NE16
G20
NE15
G20
SE5
NE15
G25
N2
G7
N11
G16
NE22
G28
NE24
G30
NE22
G32
NE25
G33
NE24
G33
NE24
G34
NE25
G34
NE18
G27
1 day
ago
NE11
G16
N6
G9
N4
N6
NE15
G20
N14
G18
N13
G16
N10
G16
N12
G19
N13
G17
N16
G20
N10
G13
NW10
G15
N12
G17
NE14
G17
NE12
G16
NE16
G22
NE17
G22
NE16
G24
N18
G23
NE15
G23
NE16
G21
NE16
G20
NE17
G23
2 days
ago
S3
NW6
E4
G7
NW4
NE4
G7
NE12
G17
NE11
G18
NE15
G21
NE12
G19
NE15
G21
NE17
G21
NE12
G22
NE17
G22
NE13
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi59 minNE 815.00 miMostly Cloudy75°F64°F69%1019.6 hPa
Kahului, Kahului Airport, HI13 mi50 minENE 19 G 2910.00 miPartly Cloudy and Breezy78°F64°F64%1018.9 hPa
Lanai City, Lanai Airport, HI16 mi48 minNE 14 G 1710.00 miMostly Cloudy73°F64°F74%1019.2 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE8
G14
NE7NE10
G16
NE10
G16
NE16
G24
E12
G22
NE17
G23
NE12
G21
NE11
G19
E17
G27
NE9
G17
NE8
1 day ago------------------------NE10E14NE15NE7SW6W5NE11
G22
NE13
G24
NE14
G24
NE14
G28
E11
G23
NE12
G23
2 days ago------------------------E7N10NE12NE8NE10NE15NE15
G24
--NE17
G23
NE15----

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Mon -- 03:02 AM HST     1.88 feet High Tide
Mon -- 06:17 AM HST     Moonrise
Mon -- 06:23 AM HST     Sunrise
Mon -- 09:17 AM HST     -0.09 feet Low Tide
Mon -- 03:32 PM HST     1.72 feet High Tide
Mon -- 04:59 PM HST     New Moon
Mon -- 06:40 PM HST     Sunset
Mon -- 06:40 PM HST     Moonset
Mon -- 09:30 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.41.81.91.81.410.50.1-0.1-00.20.61.11.51.71.71.51.10.70.30.10.10.3

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 02:09 AM HST     2.26 feet High Tide
Mon -- 06:16 AM HST     Moonrise
Mon -- 06:23 AM HST     Sunrise
Mon -- 08:26 AM HST     -0.08 feet Low Tide
Mon -- 02:27 PM HST     1.99 feet High Tide
Mon -- 04:59 PM HST     New Moon
Mon -- 06:39 PM HST     Sunset
Mon -- 06:39 PM HST     Moonset
Mon -- 08:28 PM HST     -0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.62.12.32.21.81.30.70.2-0.1-00.30.71.31.721.91.71.20.70.2-0-00.20.7

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 (0,6,7,8)
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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.