Friday, December15, 2017 L-36.com


Marine Weather and Tides
Kahului, 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 6:54AMSunset 5:49PM Friday December 15, 2017 5:18 PM HST (03:18 UTC) Moonrise 4:45AMMoonset 4:19PM Illumination 5% Phase: Waning Crescent; Moon at 27 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- 324 Pm Hst Fri Dec 15 2017
Tonight..Northeast winds 20 knots easing to 10 knots after midnight. Wind waves 3 feet in the evening then 2 feet or less. Scattered heavy showers and slight chance of Thunderstorms.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered heavy showers and slight chance of Thunderstorms.
Saturday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Sunday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the morning.
Sunday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers through the night.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers through the day.
Monday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Wednesday..Winds variable less than 10 knots becoming southwest 10 knots in the afternoon, then becoming variable less than 10 knots in the evening becoming west 10 knots after midnight. Wind waves 3 feet. Scattered showers.
PHZ100 324 Pm Hst Fri Dec 15 2017
Synopsis for hawaiian coastal waters.. Northwest swell will continue to subside through Saturday. Strong northeast winds today will also subside tonight and into the weekend as a low pressure trough moves westward over the state.

7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 160214
afdhfo
area forecast discussion
national weather service honolulu hi
414 pm hst Fri dec 15 2017

Synopsis
An upper level low and increasing moisture will bring increasing
showers with locally heavy downpours possible and a slight chance
of thunderstorms. A brief respite to the active weather expected
late Sunday into Monday. Increasing rainfall is possible again
beginning around Monday night as an upper level trough moves over
the islands from the northwest.

Discussion
A 1035 mb surface high is near 40n137w, or about 1800 miles
northeast of honolulu. A surface ridge extends southwest from this
high through a point approximately 700 miles north of kauai.

Elsewhere, a north to south oriented surface trough is about 100
miles east of hilo this afternoon slowly tracking west towards the
state. The tight pressure gradient between these features is
maintaining breezy north winds across western end of the state.

Winds have tapered off across the eastern portion of the state and
with the light winds expected to spread westward tonight.

Aloft, middle and upper-tropospheric lows are located around 240
miles north of hilo. The surface trough described above is a
reflection of these features, which are propagating slowly towards
the west. The close proximity of the lows appears to have already
destabilized the atmosphere over the eastern end of the state. The
early morning hilo balloon sounding shows no significant low-
level inversion. Radar reflectivity data this afternoon indicate
mainly numerous showers moving across oahu and maui county with
fewer showers across kauai and the big island.

The upper lows are expected to reach a position just northeast of
the islands on Saturday, and then slowly pull away toward the
northeast on Sunday. The surface trough will drag westward over
the island chain tonight and Saturday and bring a slug of moisture
over the islands that will be enhanced by the upper lows. Wet
weather is expected for most of the state through at least
Saturday, and possibly Saturday night as well, and unstable
atmosphere will allow for heavier showers and isolated
thunderstorms. In addition, the upper low will bring freezing
temperatures as low as haleakala summit. A winter weather advisory
is in effect for haleakala above 9000 feet for mainly for the
freezing rain potential. See the winter weather message (wswhfo)
product on our website for more information.

Winds will weaken tonight as the surface trough passes, becoming
light and variable through the weekend, allowing for daytime sea
breezes and nighttime land breezes to set up beginning Saturday.

The sea breezes may provide additional support for deep convection
over the islands tomorrow.

The upper lows will lift away to the north Sunday, and may
provide a brief respite from the active weather on late Sunday
into Monday. However, an upper- level trough is forecast to dig
down toward the islands from the northwest, with deep tropical
moisture pushes up from the southeast Monday night into Tuesday.

This may provide widespread showers overspreading the islands. In
addition, a couple of cold fronts may sweep across the islands
from the northwest later in the week.

Aviation
A surface trough east of the big island will continue to move
west tonight. The locally breezy north-northeast winds will be
replaced with light winds from east to west tonight. Airmet tango
for low level turbulence will likely be cancelled across the
state by the next routine issuance at 0400z.

A mid to upper level low with its center a couple hundred miles
northeast of the central islands will gradually shift west
tonight. The upper low may create areas of light to moderate upper
level turbulence tonight and an airmet tango for upper turbulence
may be needed. This low will help to destabilize the atmosphere
and enhanced passing showers. The main moisture axis looks to be
spreading southwest over the central islands. Showers could be
locally heavy at times, carrying MVFR to isol ifr conditions,
especially for windward areas on the central islands. The
forecast also carries a slight chance of thunderstorms from kauai
through the northern portion of big island tonight. Airmet sierra
for mountain obscuration is posted from kauai through maui.

Marine
A surface trough northeast through southeast of the big island
will be moving westward across the coastal waters through the
weekend. The trough has lowered the winds over the eastern
waters. The weakening trend should proceed into the western waters
as the trough continues moving westward through tonight. Winds
should remain light through early next week
observations from the nearshore pacioos buoys have been showing a
declining northwest swell through the day. The nearshore buoys
are also showing a short period northeast wave component produced
by strong northeasterly winds west of the trough. The
northeasterly swell has been large enough to warrant a high surf
advisory for east facing shores. As the winds decrease, the
northeasterly swell will decrease and drop below advisory level,
possibly by early Saturday morning.

As the winds and seas gradually subside, conditions are expected
to drop below small craft advisory criteria. The leeward waters of
the big island, maui county, and oahu have dropped below criteria
today, as well as maalaea bay. The remaining waters may drop out
after tonight.

Heavy showers and isolated thunderstorms will be possible across
parts of the coastal and offshore waters through at least
Saturday due to a nearby upper level trough.

See the collaborative nearshore swell and wind forecast for
details on expected swell and resulting surf.

Hfo watches warnings advisories
High surf advisory until 6 am hst Saturday for east facing shores
of kauai, oahu, molokai, maui and big island.

Winter weather advisory until noon hst Saturday for haleakala
summit.

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

Discussion... Foster
aviation... Eaton
marine... Kodama


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi49 min N 16 G 18 71°F 74°F1010.8 hPa
51205 8 mi49 min 78°F10 ft
51202 - Mokapu Point, HI (098) 73 mi45 min 76°F9 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE21
G26
NE21
G27
N22
G27
NE24
G30
N21
G27
NE18
G25
N21
G27
N21
N20
G25
N22
N21
G26
N22
NE16
G20
NE22
N12
G16
NE13
G19
N13
G16
E4
G8
N18
G24
N15
G20
N18
G22
NW14
G17
NW18
N15
1 day
ago
N14
N15
G19
N14
G17
N14
G18
N17
G24
N19
N18
N17
N20
NE19
G24
N21
NE16
G27
N21
NE19
N21
N22
N20
NE19
NE15
G24
NE17
G22
N21
NE21
G26
NE22
G27
NE18
G25
2 days
ago
N6
G16
N11
G16
NW15
NW13
G16
NW13
NW13
G17
NW13
G17
NW13
G17
NW10
NW10
N12
G15
N15
G19
N16
N15
G19
N15
N11
G14
N14
G17
N15
N15
N13
G16
N13
G16
N11
N13
G16
N12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi25 minN 15 G 2110.00 miMostly Cloudy71°F61°F71%1011.4 hPa
Lahaina - West Maui, HI12 mi34 minNNW 1712.00 miLight Rain68°F59°F73%1011.5 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE22NE22NE24
G29
NE23
G29
N24
G31
NE18
G31
NE24
G30
NE20NE22
G26
NE20NE19NE17
G23
E5NE7NE14NE7
G17
NE14NE3NE14N13
G18
N12NW12N14N15
G21
1 day agoN12N15NE14N17N18N17N18N15N18NE17NE18
G25
N19
G24
NE21NE19NE18NE19NE20NE21
G25
NE17
G27
NE17NE18
G26
NE22
G27
NE24NE24
G30
2 days agoN15
G22
N11N11N11N15NW9N8N12N13N10N13N16N14N13N13N10N13N14N15N14N12N11N12NE12

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 01:32 AM HST     2.35 feet High Tide
Fri -- 04:45 AM HST     Moonrise
Fri -- 06:54 AM HST     Sunrise
Fri -- 07:43 AM HST     0.95 feet Low Tide
Fri -- 12:14 PM HST     1.53 feet High Tide
Fri -- 04:19 PM HST     Moonset
Fri -- 05:47 PM HST     Sunset
Fri -- 06:45 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
2.12.32.32.11.81.51.2111.11.21.41.51.51.30.90.50.1-0.1-0.2-00.40.91.5

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Fri -- 02:32 AM HST     2.32 feet High Tide
Fri -- 04:45 AM HST     Moonrise
Fri -- 06:54 AM HST     Sunrise
Fri -- 09:05 AM HST     0.49 feet Low Tide
Fri -- 02:12 PM HST     1.19 feet High Tide
Fri -- 04:19 PM HST     Moonset
Fri -- 05:47 PM HST     Sunset
Fri -- 07:45 PM HST     -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.622.32.32.11.71.20.80.60.50.50.70.91.11.21.10.90.60.2-0-0.10.10.40.9

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.