Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Wailuku, HI

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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 10:27 AM HST (20:27 UTC) Moonrise 3:14PMMoonset 1:43AM Illumination 74% 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- 941 Am Hst Wed Sep 19 2018
Rest of today..West winds 10 knots. Wind waves 2 feet or less. Scattered 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.
Thursday..Northeast winds 10 knots becoming north 20 knots in the afternoon. Wind waves 2 feet or less. Isolated showers in the morning, then scattered showers in the afternoon.
Thursday night..North winds 20 knots. Wind waves 3 feet in the evening then 2 feet or less. Scattered 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 941 Am Hst Wed Sep 19 2018
Synopsis for hawaiian coastal waters.. A weak surface trough will slowly move from east to west across the area during the next couple of days, leading to mainly gentle to moderate east to east-southeast winds. Easterly trade winds will rebuild late Thursday and Friday as the trough lifts away. Winds may shift southeasterly on Sunday as low pressure develops several hundred miles northwest of kauai.


7 Day Forecast for Marine Location Near Wailuku, HI
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location: 20.9, -156.49     debug


Area Discussion for -
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Fxhw60 phfo 191951
afdhfo
area forecast discussion
national weather service honolulu hi
951 am hst Wed sep 19 2018

Synopsis
A trough of low pressure will move across the area over the next
couple of days. Winds will be light favoring daytime sea breezes
and nighttime land breezes. An increase is showers is expected
with the troughs passage. Trade winds will return Friday and on
through the weekend. An area of low pressure is expected to
develop northwest of the area early next week with winds becoming
lighter and out of a southeastly directions. Shower activity may
increase over the west end of the state around the middle of next
week.

Discussion
A weak trough of low pressure lies near the big island. The
trough is forecast to move from east to west across the island
chain over the next couple of days. Winds will generally be on the
light side in the troughs vicinity with daytime sea breezes and
nighttime land breezes dominating in many locations. Higher
moisture content is also present along and just east of the trough
axis. The result will be a more humid airmass in place and well as
increased shower chances. Increasing rainfall will begin first
over the big island today and then gradually spread up the island
chain tonight and Thursday. The highest probabilities for showers
will be over interior and mauka areas but showers are possible
over some leeward areas as well. Satellite and radar imagery also
indicates that a few thunderstorms are occurring just east of the
coastal waters. This area may move onshore over windward big
island this afternoon or evening. Thus have added a slight chance
for thunderstorms for this afternoon and tonight over eastern
sections of the big island. Lingering moisture over the big
island on Thursday along with daytime heating may allow for a few
thunderstorms to develop over the kona slopes during the afternoon
hours.

High pressure will build in behind the trough by Friday with
trade winds making a gradual return. A drier airmass will also
filter in from east to west with shower activity tapering off.

Passing showers will tend to favor windward and mauka areas.

Beginning early next week, an area of low pressure is forecast to
develop northwest of the area. This will gradually turn our winds
to a southeasterly direction. There is some differences in the
global models on how close its associated moisture field will be
to islands. It appears that the west end of the state could see an
increase in rainfall chances but it is still to early to forecast
when and where this might occur.

Aviation
Weak southeasterly flow will allow sea breezes to predominate most
areas late this afternoon and evening. Isolated MVFR conditions are
possible in passing showers, butVFR conditions will prevail all
areas.

Mostly clear skies across the smaller islands this morning will
give way in the afternoon to patchy low topped cumulus focused
over island interiors.

On the big island, enhanced moisture and instability being pulled
out of the east will yield increasing layered clouds across the
windward side. Meanwhile, big island leeward side will see sea-
breeze driven cumulus and towering cumulus build-ups in the late
afternoon and evening, especially over higher terrain. Slight
chance of thunderstorms over interior and windward big island this
evening.

Marine
A surface trough moving across the island chain from the east
will disrupt the trade wind flow during the next couple of days.

Mainly gentle to moderate east to east-southeast winds will
prevail, with stronger winds holding around the big island and
maui. As the trough lifts away, easterly trade winds will rebuild,
possibly reaching small craft advisory strength across the
typically windy waters around the big island and maui into the
weekend. Winds will likely veer out of the southeast Sunday and
early next week as an area of low pressure forms several hundred
miles northwest of kauai.

Surf will remain below advisory levels along all shores this
week. A south swell will peak near summer average today, then
slowly subside through Friday. The current northwest swell will
slowly fade through the day. As trade winds rebuild late Thursday
and Friday, rough, short-period surf will briefly rise above
summertime average, then drop slightly during the weekend.

Hfo watches warnings advisories
None.

Synopsis discussion... Burke
aviation... Bedal
marine... Wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 1 mi45 min N 7 G 8 78°F 84°F1013.8 hPa
51205 9 mi27 min 81°F5 ft
51213 29 mi57 min 82°F3 ft

Wind History for Kahului, Kahului Harbor, HI
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NE12
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G16
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NE7
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NE16
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NE17
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G24
NE16
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NE13
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NE12
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G16
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NE6
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NE12
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NE8
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G21
NE14
G17
NE14
G24

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI3 mi33 minN 710.00 miFair84°F72°F67%1014.3 hPa
Lahaina - West Maui, HI11 mi42 minVar 515.00 miA Few Clouds82°F68°F62%1014.2 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE11
G21
NE19NE17N18NE14NE16NE18NE14NE10N11E3NW6SE4CalmSE5S3SE6SE5SE4SE5SE3--N5N7
1 day agoE16
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NE9NE6NE3NE9NE9NE9NE8NE10NE8E5E3NE10NE12NE10NE12NE13
2 days agoNE15
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G25
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NE12
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NE19
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NE15
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NE12
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NE11NE8NE9NE12NE9NE9NE11NE8NE12NE12NE8NE9NE9
G18
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G23
NE18
G28

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.


Tide / Current Tables for Kihei, Maui (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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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 (16,3,4,5)
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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.