Sunday, May28, 2017 L-36.com


Marine Weather and Tides
Lahaina, HI

Version 3.4
What's New / NOTES
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 5:43AMSunset 7:03PM Sunday May 28, 2017 2:14 PM HST (00:14 UTC) Moonrise 8:54AMMoonset 10:23PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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- 930 Am Hst Sun May 28 2017
Rest of today..Winds variable less than 10 knots. Wind waves 2 feet or less. SWell south 3 feet. Isolated showers in the afternoon.
Tonight..Winds variable less than 10 knots. Wind waves 2 feet or less. SWell south 3 feet.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Monday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Tuesday..North winds 20 knots. Wind waves 2 feet or less.
Tuesday night..Northeast winds to 25 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds to 25 knots. Wind waves 2 feet or less.
Thursday..Northeast winds to 25 knots. Wind waves 3 feet.
PHZ100 930 Am Hst Sun May 28 2017
Synopsis for hawaiian coastal waters.. A high northwest of the area will weaken through memorial day. A new high will build northeast of the area starting Monday night.

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 281947
afdhfo
area forecast discussion
national weather service honolulu hi
947 am hst Sun may 28 2017

Synopsis
Light winds will prevail through the holiday weekend, allowing
for a few windward showers during nights and mornings, with clouds
and showers shifting to leeward and interior areas in the
afternoons. The island atmosphere will be a little unstable today,
which will allow some showers to become briefly heavy. Light to
moderate trade winds on Tuesday and Wednesday are expected to
become breezy by the end of the week. The trade winds will bring a
few brief windward showers, with mostly dry conditions leeward,
as a more seasonable weather pattern develops.

Discussion
Surface troughs NW and SE of the state have interrupted island
trade winds, bringing variable winds with daytime sea breezes and
nighttime land breezes over the islands. This trend will continue
through memorial day. The synoptic scale wind flow is light from
the ese, and this pushed some persistent showers into windward
oahu overnight. Otherwise skies cleared overnight bringing a sunny
start to most places this morning. Without the cooling trades,
sensible weather will be hot and humid during the day with cooling
temperatures at night. Skies over the islands will become
increasingly cloudy this afternoon as sea breezes and land heating
create rising motion over interior areas. This diurnal pattern of
clearing skies overnight with clouds and passing showers during
the day will continue through memorial day.

An upper level trough now over the eastern end of the state has
brought some instability to the atmosphere. The early morning
sounding from hilo shows an increase in atmospheric instability
with ml CAPE increasing from zero yesterday afternoon to 311 j kg.

This instability has weakened our normally cloud capping
temperature inversion, and will allow for some locally heavy
showers to develop during the peak afternoon convective times, and
last into the evening. The early morning lihue sounding shows a
decrease in instability with the trough well east of the garden
isle. The heavier showers seen in the lihue area yesterday are not
expected today. With the instability over the big island, there
will be a chance of thunderstorms over the higher elevations of
mauna kea and mauna loa along with the potential of locally heavy
showers.

High pressure will build north of the state Monday night and
Tuesday bringing back our normal trade winds with windward and
mountain showers expected.

Aviation
A weak high pressure ridge north of the hawaiian islands will
continue to produce weak easterly trade winds allowing onshore sea
breezes to develop over each island during the day with offshore
land breezes at night. Cloud ceilings and scattered showers will
develop over island interiors by afternoon with brief periods of
MVFR conditions forecast through the early evening hours. Land
breezes overnight will tend to clear out cloud cover over each
island by the early morning hours.

An upper level low currently over the big island will continue to
drift eastward away from the state over the next 24 hours.

Unstable air with this low may produce thunderstorm activity over
the big island between 22z and 03z. Cloud tops will range from
10-15kft across the islands with CB cloud tops up to 30kft. Lower
cloud ceilings may lead to mountain obscuration sigmet sierra
later this afternoon for the big island and maui.

No airmets currently in effect.

Marine
A high surf advisory remains in effect through this afternoon for
all south facing shores. The current large south swell will
gradually diminish through Tuesday. Please see the latest coastal
hazard message (cfwhfo) for additional information about the
hazardous surf conditions.

Actual tides at honolulu continue to arrive about 0.5 feet above
predicted. High tides today and tomorrow are predicted to be over
2 feet, and just under 2 feet on Tuesday at honolulu. A similar
period of tides exceeding 2 feet are expected in mid to late june,
between june 21 and june 27. It is during this period that tide
levels are expected to reach the same heights as during this
current event.

The combination of king tides and the south swell continues to
bring the likelihood of coastal inundation, particularly during
the afternoon high tide period. With the south swell surf on the
decline and the height of the high tides diminishing, impacts will
slowly diminish over the next few days. Please see the special
weather statement (spshfo) product for more information about the
potential impacts from the high tides combined with the large
surf.

A northeast swell building today will produce moderate surf through
memorial day along east facing shores. North swells will be very
small though memorial day. A moderate north northwest swell is
forecast to arrive Monday night, peak below advisory levels Tuesday
night, then subside through Thursday.

Light winds are expected to persist through memorial day, with
trade winds forecast to gradually strengthen starting Tuesday.

Winds could reach small craft advisory (sca) levels in the typical
windier locations around maui county and the big island
Wednesday.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening for niihau-kauai
windward-kauai leeward-oahu south shore-waianae coast-molokai
leeward-lanai makai-kahoolawe-maui leeward west-windward
haleakala-leeward haleakala-kona-south big island-big island
north and east.

Morrison... Discussion
bohlin... Aviation
m ballard... Marine


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi44 min N 11 G 13 78°F 81°F1015.8 hPa
51205 17 mi65 min 79°F4 ft
51202 - Mokapu Point, HI (098) 65 mi40 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi29 minW 715.00 miPartly Cloudy82°F64°F55%1016.3 hPa
Kahului, Kahului Airport, HI13 mi20 minN 1610.00 miPartly Cloudy85°F69°F59%1015.8 hPa
Lanai City, Lanai Airport, HI16 mi18 minW 910.00 miPartly Cloudy77°F66°F69%1015.9 hPa

Wind History from HJH (wind in knots)
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Last 24hrN7N8SE7S7------------------------CalmCalmCalmCalmNE7W73W7
1 day agoN15N15----------------------------E7CalmCalmW6W6--NW8NW12
2 days agoNE17
G23
NE18
G24
----------------------------NE8N10N12N12NE15N15N15N15

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sun -- 12:41 AM HST     0.04 feet Low Tide
Sun -- 05:36 AM HST     0.74 feet High Tide
Sun -- 05:45 AM HST     Sunrise
Sun -- 08:54 AM HST     Moonrise
Sun -- 10:39 AM HST     -0.07 feet Low Tide
Sun -- 06:14 PM HST     2.38 feet High Tide
Sun -- 07:02 PM HST     Sunset
Sun -- 10:23 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.100.20.40.60.70.70.60.40.1-0-0.10.10.40.91.41.92.22.42.321.61.10.6

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sun -- 03:23 AM HST     1.19 feet High Tide
Sun -- 05:44 AM HST     Sunrise
Sun -- 08:53 AM HST     Moonrise
Sun -- 09:45 AM HST     -0.48 feet Low Tide
Sun -- 05:20 PM HST     2.58 feet High Tide
Sun -- 07:02 PM HST     Sunset
Sun -- 10:22 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.91.11.21.210.60.2-0.1-0.4-0.5-0.30.10.71.31.92.42.62.52.31.91.51.10.8

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 (20,4,5,8)
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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.