Friday, September22, 2017 L-36.com


Marine Weather and Tides
Launiupoko, 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 6:13AMSunset 6:23PM Thursday September 21, 2017 8:12 PM HST (06:12 UTC) Moonrise 7:39AMMoonset 7:48PM Illumination 3% 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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PHZ119 Maalaea Bay- 326 Pm Hst Thu Sep 21 2017
.small craft advisory in effect through early Friday morning...
Tonight..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds 20 knots. Wind waves 3 feet.
Friday night..North winds 15 knots. Wind waves 3 feet in the evening then 2 feet or less.
Saturday..North winds 20 knots. Wind waves 2 feet or less.
Saturday night..Northeast winds 15 knots. Wind waves 2 feet or less.
Sunday..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Sunday night..Northeast winds 15 knots. Wind waves 2 feet or less.
Monday..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..North winds 10 knots. Wind waves 4 feet.
PHZ100 326 Pm Hst Thu Sep 21 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure far north of the state will slowly weaken on Friday. The ridge will move closer to the state during the weekend as a cold front passes to the north.

7 Day Forecast for Marine Location Near Launiupoko, HI
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location: 20.85, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 220559
afdhfo
area forecast discussion
national weather service honolulu hi
759 pm hst Thu sep 21 2017

Synopsis
Breezy trade winds will hold through Friday, then gradually trend
down over the weekend and early next week as the ridge of high
pressure to the north weakens and a weak surface trough approaches
from the east. A typical pattern of mainly windward showers will
prevail, though interior and leeward big island will experience
extensive afternoon cloud cover and a few showers each day.

Discussion
The latest surface analysis showed a ridge axis associated with 1033
mb high pressure extending west-southwest across the central pacific
north of the state and a weak trough of low pressure positioned
south of the islands. The pressure gradient between these two
synoptic features continues to support breezy trades across the
local area. Satellite-derived precipitable water imagery and upper
air soundings at lihue and hilo reflected values near and below
average across much of the state for this time of year that ranged
from 1.1-1.3". The exception was over the southern half of the big
island, where higher moisture values were shown (1.4-1.5"), likely
due to the aforementioned surface trough to the south and an upper
trough extending southwest across the big island. The latest
rainfall summary for the islands reflected this higher moisture
source over the big island and showed the best rainfall
accumulations over the past 24 hrs at typical windward and leeward
locations (up to half of an inch). Elsewhere across the state,
minimal accumulations were shown.

The latest short-term model guidance remains in good agreement and
is lining up well with the current pattern and trends around the
state. A general consensus supports breezy trade winds persisting
through Friday, then steadily trending down over the weekend as the
ridge to the north weakens and the trough south of the big island
continues westward. Mostly dry and stable trade wind weather will
continue each day with clouds and showers favoring windward
locations. Rainfall accumulations will be light, with precipitable
water values holding in the 1-1.2" range (below average) through the
weekend.

For the extended (Monday through midweek), light to moderate trades
are expected to persist across the islands due to a weakness within
the ridge north of the state. Clouds and showers will likely favor
windward locations. The GFS and ECMWF both depict a weak surface
trough approaching the islands within the easterlies by midweek.

This combined with a slight increase in moisture, may be enough to
bring the rain chances back toward normal.

Aviation
High pressure north-northeast of the state will keep a moderate
trade wind flow in place through Friday. Clouds and showers will
favor windward and mauka areas, with a stray shower trickling over
into leeward areas from time to time. Brief MVFR CIGS vsbys will
be possible in windward areas as trade showers move through, but
predominantlyVFR conditions are expected at the terminals through
06z Saturday.

Airmet tango remains in effect for low level turbulence over and
downwind of the terrain of all islands. This airmet will likely
remain in place through Friday.

Marine
Fresh to locally strong trades should gradually weaken over the
next couple of days, putting wind speeds into the light to
moderate range by the weekend. Trade winds will bring rough surf
along east facing shores until then.

Surf along south facing shores will remain small through early next
week, with mainly background southeast and southwest swell energy
expected. The next potential long-period pulse out of the
southwest from the tasman sea will be by Sunday, which should
lead to a slight increase in surf. For the extended forecast,
strong to gale-force southwest winds associated with a low in the
tasman sea may lead to another small southwest (210-220 deg)
swell Tuesday through midweek.

A small northwest (310 deg) swell will continue into the weekend
before easing. Another small reinforcement is expected to fill in
around Sunday night through the middle of next week.

Hfo watches warnings advisories
Small craft advisory until 6 am hst Friday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Gibbs
aviation... Jelsema
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi42 min NE 16 G 20 79°F 80°F1017.1 hPa
51205 18 mi33 min 80°F6 ft
51202 - Mokapu Point, HI (098) 66 mi38 min 81°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE11
G15
NE7
G14
NE12
G17
N10
N9
G13
NE8
G11
NE10
G14
NE9
G12
NE11
G17
NE10
G13
NE7
G13
NE10
G16
NE16
G23
NE6
G12
NE16
NE18
G30
NE18
G24
NE14
G22
NE13
G23
NE12
G22
NE13
G23
NE15
G19
NE15
G19
NE10
G20
1 day
ago
NE10
G16
NE13
G17
NE15
NE16
G20
NE11
G14
NE22
G27
NE12
G15
NE10
G14
NW8
NE7
G10
NE7
NE12
G15
NE13
G17
NE15
G19
NE12
G17
NE15
G19
NE16
G22
NE14
G22
NE18
G23
NE16
N17
G21
NE16
G22
NE14
G19
NE12
G15
2 days
ago
NE11
G25
NE14
G21
NE13
G17
NE10
G17
NE16
G20
NE16
G22
NE15
G21
NE17
G22
NE17
G24
NE18
G24
NE15
G20
NE17
G21
NE16
G21
NE13
G21
E7
G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi2.4 hrsNNE 15 G 2115.00 miPartly Cloudy81°F64°F58%1016.3 hPa
Kahului, Kahului Airport, HI14 mi78 minNE 1010.00 miSmoke79°F69°F72%1017 hPa
Lanai City, Lanai Airport, HI15 mi76 minNE 1810.00 miFair and Breezy73°F66°F79%1016 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE7N9NE15
G20
NE19
G22
NE17
G21
NE14
G22
NE15
G25
NE16
G26
NE17
G26
NE15
G22
NE12
G23
N15
G21
1 day ago------------------------NE8
G14
NE8NE15
G23
NE18NE19NE10
G19
NE17
G25
NE15
G23
NE17
G24
NE20
G26
NE15
G24
NE12
G22
2 days ago------------------------NE10NE16E13
G25
NE16
G24
NE15
G28
NE19
G28
NE15
G27
E18
G24
E15
G26
NE15
G24
NE15
G22
E12
G20

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 04:52 AM HST     2.00 feet High Tide
Fri -- 06:15 AM HST     Sunrise
Fri -- 08:30 AM HST     Moonrise
Fri -- 10:58 AM HST     0.58 feet Low Tide
Fri -- 04:46 PM HST     1.68 feet High Tide
Fri -- 06:22 PM HST     Sunset
Fri -- 08:27 PM HST     Moonset
Fri -- 10:48 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
0.60.91.31.71.921.91.61.20.90.70.60.70.91.21.41.61.71.61.310.70.40.4

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 03:35 AM HST     2.21 feet High Tide
Fri -- 06:14 AM HST     Sunrise
Fri -- 08:30 AM HST     Moonrise
Fri -- 09:36 AM HST     0.51 feet Low Tide
Fri -- 03:26 PM HST     2.04 feet High Tide
Fri -- 06:21 PM HST     Sunset
Fri -- 08:26 PM HST     Moonset
Fri -- 09:42 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.92.22.221.61.20.80.60.50.71.11.51.8221.81.40.90.50.30.20.4

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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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.