Saturday, August18, 2018 L-36.com


Marine Weather and Tides
Kihei, HI

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Sunrise 6:05AMSunset 6:53PM Saturday August 18, 2018 6:26 AM HST (16:26 UTC) Moonrise 1:12PMMoonset 12:00AM Illumination 47% Phase: First Quarter Moon; Moon at 7 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- 329 Am Hst Sat Aug 18 2018
Today..North winds 20 knots. Wind waves 2 feet or less. Scattered heavy showers.
Tonight..North winds 25 knots. Wind waves 2 feet or less. Scattered heavy showers and isolated Thunderstorms.
Sunday..North winds 25 knots. Wind waves 2 feet or less. Scattered heavy showers.
Sunday night..North winds 25 knots. Wind waves 2 feet or less.
Monday..North winds 25 knots. Wind waves 2 feet or less then 3 feet in the afternoon.
Monday night..North winds 25 knots. Wind waves 3 feet.
Tuesday..North winds 25 knots. Wind waves 3 feet. Scattered showers in the afternoon.
Tuesday night..North winds 25 knots. Wind waves 3 feet.
Wednesday..North winds 25 knots. Wind waves 3 feet.
PHZ100 329 Am Hst Sat Aug 18 2018
Synopsis for hawaiian coastal waters.. A weak trough of low pressure will move through the marine area today and tonight. Light to moderate trade winds will persist today, then increase to moderate and locally strong levels tonight and Sunday as high pressure builds northeast of the island chain. Moderate to strong trade winds are then expected Sunday night through the middle of next week as hurricane lane is forecast to pass by to the south of the big island. It is still too early to determine exact impacts that hurricane lane may have on the coastal waters, so mariners are urged to keep up to date with the latest forecasts.


7 Day Forecast for Marine Location Near Kihei, HI
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location: 20.75, -156.45     debug


Area Discussion for -
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Fxhw60 phfo 181327
afdhfo
area forecast discussion
national weather service honolulu hi
327 am hst Sat aug 18 2018

Synopsis
Light to moderate trade winds will continue through the day today,
then begin to increase into the moderate to breezy category by
Sunday as a weak trough of low pressure moves through from east
to west. Humid and unsettled conditions associated with this
trough will translate to increasing rainfall chances and
potentially a few thunderstorms. Breezy and drier trade wind
conditions are expected to fill in Sunday night through the early
portion of next week. Although it is too early to determine how
the islands will be impacted, hurricane lane is forecast to track
through the region near the islands through the middle part of
next week.

Discussion
Short-term (through Sunday night) guidance remains in good
agreement and is initializing well with the current pattern and
trends. Consensus supports increasing moisture and rain chances
across the state as a weak surface trough moves through from east
to west. The latest surface analysis and satellite imagery showed
this feature approaching the big island tracking toward the west
within the trades. Earlier satellite-derived precipitable water
(pw) imagery depicted a large area of higher moisture associated
with it with values at and above 2". Expect humidity levels to
climb as mid 70 dewpoints fill in.

Provided light to moderate trades in place, the bulk of the shower
activity will focus over windward and mauka locations, with the
exception being over the typical leeward locations such as the big
island through the afternoon hours (due to peak heating sea
breezes). In addition to the increasing moisture and rainfall
chances expected, a few thunderstorms will remain possible,
especially through the afternoon hours. Recent upper air
soundings at hilo support this potential with modest mid-level
lapse rates no inversion and increasing pws. Confidence, however,
remains low, mainly due a mid- to upper-level ridge that guidance
is depicting nosing westward over the state through the day
today.

The extended (Monday through Thursday) guidance remains in decent
agreement and supports a drier and more stable trade wind pattern
returning Monday through Tuesday. Trades will likely climb into the
breezy category due to a strengthening pressure gradient between
high pressure to the north and hurricane lane approaching the region
from the east-southeast. Forecast uncertainty ramps up heading into
the middle latter half of next week as hurricane lane passes near
or just south of the islands. It remains too early to forecast
the exact location of lane and whether it will directly impact
portions the state. Forecast confidence will steadily rise through
the weekend into early next week.

Aviation
High pressure far northeast of the islands will maintain light to
locally moderate trade winds across the state through Saturday
night. A deep band of moisture, embedded in the trade wind flow,
is anticipated to reach the big island by mid morning and spread
across the smaller islands by early evening.

Clouds and showers will favor windward coasts and slopes through
the period, but both shower coverage and intensity will increase,
beginning in the east and spreading to the west. Locally heavy
downpours, possibly in thunderstorms, are expected across windward
big island by late morning and the east maui uplands by late
afternoon. An airmet for mountain obscuration will likely become
necessary across windward big island later this morning. It may
need to be expanded later in the day to include windward maui.

Marine
Light to moderate trade winds are expected to continue today,
with winds remaining below small craft advisory (sca) thresholds.

A weak trough of low pressure will pass through the islands
today and tonight, bringing the potential for some heavier
showers and thunderstorms. Following the passage of the weak
trough, high pressure will build well northeast of the state
through the middle of next week, while hurricane hector is
forecast to pass by to the south of the big island on Wednesday.

As a result, we should see a strengthening of the pressure
gradient across the islands tonight and Sunday, with sca
conditions likely returning to the typically windy waters around
maui and the big island. Moderate to strong trade winds are then
expected to continue Sunday night through the middle of next week,
and SCA conditions may expand to other marine zones. It is still
too early to determine the exact impacts that hurricane lane may
have on the coastal waters, so mariners are urged to keep up to
date with the latest forecasts.

No significant swells are expected through the weekend, so expect
surf to remain small on all shores. A small, north-northwest
swell is expected to arrive on Monday and continue through
Tuesday. A larger north swell is expected to arrive late Tuesday,
peak Tuesday night and early Wednesday, then slowly fade through
Thursday. We will continue to monitor the track and intensity of
hurricane lane as it moves closer to the islands, as an elevated
easterly swell is expected to move into the coastal waters
beginning Sunday night and continuing through the middle of next
week. This easterly swell will likely result in large surf for
east and southeast facing shores of the big island and could
potentially produce large surf for east facing shores of maui.

See the latest oahu surf discussion (srdhfo) for more details on
surf and swell.

Hfo watches warnings advisories
None.

Discussion... Gibbs
aviation... Bedal
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi44 min N 8.9 G 11 78°F 83°F1015 hPa
51205 19 mi86 min 80°F4 ft
51213 29 mi86 min 82°F2 ft
51202 - Mokapu Point, HI (098) 80 mi112 min 80°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI10 mi32 minNNE 1010.00 miPartly Cloudy77°F77°F100%1015.3 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE3NE13NE13--NE18NE19
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1 day agoN8N9N12N14NE16NE19NE18NE17NE17NE16N17N16NE14NE13NE14NE15NE15NE8E3CalmNW3CalmE8NE9
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Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Sat -- 03:06 AM HST     0.26 feet Low Tide
Sat -- 06:05 AM HST     Sunrise
Sat -- 10:45 AM HST     2.01 feet High Tide
Sat -- 01:11 PM HST     Moonrise
Sat -- 05:14 PM HST     0.86 feet Low Tide
Sat -- 06:53 PM HST     Sunset
Sat -- 10:16 PM HST     1.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.60.40.30.30.50.81.11.51.8221.91.61.31.10.90.90.911.11.21.21.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sat -- 01:43 AM HST     0.45 feet Low Tide
Sat -- 06:05 AM HST     Sunrise
Sat -- 10:04 AM HST     1.72 feet High Tide
Sat -- 01:11 PM HST     Moonrise
Sat -- 06:53 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.40.50.70.91.21.41.61.71.71.71.61.51.51.41.41.41.41.31.31.21.10.9

Weather Map and Satellite Images
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wmap_P
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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Wind Forecast for (12,3,4,5)
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Ground Weather Radar Station Kohala, 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.