Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Kahului, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:19AMSunset 6:41PM Wednesday March 29, 2017 1:02 AM HST (11:02 UTC) Moonrise 7:48AMMoonset 8:42PM Illumination 4% 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- 923 Pm Hst Tue Mar 28 2017
Rest of tonight..North winds 15 kt. Wind waves 2 ft or less.
Wednesday..Northwest winds 15 kt. Wind waves 2 ft or less. Isolated showers in the afternoon.
Wednesday night..North winds 15 kt. Wind waves 2 ft or less.
Thursday..Northwest winds 10 kt. Wind waves 2 ft or less. Isolated showers in the afternoon.
Thursday night..North winds 15 kt. Wind waves 2 ft or less.
Friday..North winds 20 kt. Wind waves 2 ft or less.
Friday night..North winds to 25 kt. Wind waves 3 ft.
Saturday..North winds to 25 kt. Wind waves 3 to 4 ft.
Sunday..North winds to 25 kt. Wind waves 4 ft.
PHZ100 923 Pm Hst Tue Mar 28 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the marine areas will weaken as a cold front approaches and stalls north and northwest of the area Thursday through Friday. High pressure will build north of the state over the weekend behind this front.

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 290625
afdhfo
area forecast discussion
national weather service honolulu hi
825 pm hst Tue mar 28 2017

Synopsis
A trade wind regime will persist through the upcoming weekend and
into the early part of next week as a ridge of high pressure
remains north of the islands. Showers embedded in the trade wind
flow will favor the windward and mountain. The frequency of these
showers will higher during the nights and mornings. The trades
will turn windy over the weekend and lasting through early next
week.

Discussion
The morning clouds and showers that affected some of the smaller
islands this morning gave way to a brief period of clouds across
the lee and interior sections early this afternoon. The trades
picked up enough by mid afternoon to disperse these clouds towards
evening. It was a rather wet morning in particularly the hilo
area of windward big island. Most of these showers have moved on.

The lee side of the big island is mainly cloudy but dry at sunset.

These clouds will gradually disperse during the evening hours.

During the overnight hours, the trade showers will be picking up
especially after midnight as a batch of low level moisture
approaches the big island from the east. Satellite imagery shows
the leading edge of this area 160 miles east of CAPE kumukahi at
sunset. Models have this shower area impacting windward big
islands in the next couple of hours before moving to as far as
molokai before dispersing by mid morning Wednesday.

On Wednesday, we will see a repeat of today as a tinge of
weakness in the trades will allow for a brief period of afternoon
clouds and isolated showers to form over the lee and interior
areas of the smaller islands. The models maintain this pattern
through Thursday as the last of this area of moisture finally
leaves the islands. This air mass will be followed by a pocket
of slightly drier air mass Friday and Friday night.

On Friday night, the surface high feeding the islands with the
gentle trades will be reinforced by another surface high. This
will take place some 1200 miles nne of the islands resulting in a
strong 1034 mb high. This translate in a boost in the trades to
moderate to strong speeds. At this time, there is a chance of a
wind advisory for the typically windy areas of places like the
waimea saddle on the big island and or lanai over the weekend.

This boost in the trades will be accompanied by an uptick in the
frequency of trade showers.

The weather pattern takes a change north of the islands Sunday
into Monday where the high is shoved off far to the east. This
will lead to a weaker trade wind flow by Tuesday. And with the
weaker trades, there will be fewer trade showers.

Aviation
With a broad surface high far northeast of the state, trade winds
will be light to moderate through Wednesday. Low clouds, with any
accompanying showers moving along on the trades, will mainly
affect windward and mauka sections on the individual isles, but
conditions overall will remainVFR.

There are no airmets currently in effect, and none are anticipated
through the nighttime hours.

Marine
Just over 1500 nm northwest of kauai near the date line (around 40n)
and a ridge axis extending westward from a 1030 mb high centered off
the coast of california to just north of the islands. A very strong
pressure gradient was depicted south of this low northwest of the
state, that was supported by an ascat pass earlier today where a
large area of strong west-northwest gales (focused within the 290 to
310 directional band relative to the islands) were shown out to
around 500 nm south-southwest from the low (leading edge of the
fetch was around 1300 nm northwest of the islands). According to the
latest altimeter passes, seas associated with this system have
dropped slightly from yesterday, but still upwards within the 28 to
33 ft range over the heart of the fetch region focused toward the
islands. Despite some small differences between solutions, the
latest model guidance is remaining in decent agreement with these
latest satellite trends and shows this system continuing on an
east-northeast track crossing the date line Tuesday night into
Wednesday around 40n.

A large west-northwest swell (290-310 deg) associated with this
system discussed above will result across the region, that should
reach the islands Thursday night, peak through the day Friday and
Friday night, then slowly ease over the weekend. Warning-level
surf and advisory-level seas will be expected Thursday night into
the weekend before trending down over exposed waters and beaches.

For timing, the ecmwf-wave, gfs-wavewatch iii and ensemble mean
solutions all remain in close agreement and depict seas ramping up
quickly around midnight Thursday night to small craft advisory
levels, peaking within the 10 to 14 ft range Friday, then slowly
easing through the weekend. A few of the ensemble solutions are
coming in slightly higher (by a couple of feet) at the northwest
buoys and converge at a peak near 15 ft Thursday night. If the
swell ends up coming in larger than predicted or later, warning-
level surf could continue into Saturday before dropping to
advisory levels along exposed north and west facing shores. Surf
should dip below advisory levels Sunday.

Local winds and seas will likely remain below advisory levels
through Friday as the ridge of high pressure north of the state
slightly weakens in response to a cold front that is forecast to
approach the region later in the week, then stall and weaken north
and northwest of the area into the upcoming weekend. Advisory-
level trade winds will return across portions of the waters over
the weekend as high pressure builds north of the state behind this
front.

Prior to the arrival of the large swell expected Thursday night
through the weekend, surf along north and west facing shores will
hold at levels below the advisory criteria Wednesday through
Thursday due to a lingering northwest swell from earlier this week.

Will continue to monitor buoy observations overnight for an
expected small reinforcement out of the northwest (320 deg).

Surf along east facing shores will remain small and choppy through
the week due to moderate to fresh onshore winds persisting. Surf
will begin to build over the weekend as the winds strengthen locally
and upstream of the islands and may near or reach advisory levels
along east facing shores by the end of the weekend and into early
next week.

A slight increase in surf along south facing shores will be possible
Thursday through Saturday due to a long-period swell (190 deg)
associated with recent activity across the southern pacific.

In addition to this southerly swell, wrap from the previously
discussed large west-northwest swell will add to the mix by Friday
at select spots along exposed southern facing beaches.

Hfo watches/warnings/advisories
None.

Discussion... Lau
aviation... Kinel
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi45 min N 8 G 11
51205 8 mi54 min 76°F6 ft
51203 - Kaumalapau, HI (146) 30 mi48 min 78°F5 ft
51202 - Mokapu Point, HI (098) 73 mi59 min 76°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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SE2
NW5
NE1
SE1
NW8
G12
NW2
N3
SE4
NW2
NE15
G19
NE14
G19
NE14
G17
NE16
G20
NE15
G20
NE15
G23
NE16
G20
NE15
G19
NE15
G20
NE16
G21
NE10
G15
E5
G8
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S3
NE8
G11
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NW8
NE5
N2
G5
NW11
NW6
NW6
S1
SW1
SE4
G10
NE8
G13
NE14
G19
NE21
G26
NE21
NE20
NE17
G21
NE14
G19
NE13
G18
NW4
G9
W7
G13
NW8
N3
G7
NE1
S1
W4
G8
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ago
NE16
G20
NE15
G20
SE5
NE15
G25
N2
G7
N11
G16
NE22
G28
NE24
G30
NE22
G32
NE25
G33
NE24
G33
NE24
G34
NE25
G34
NE18
G27
NE23
G29
NE13
G20
E7
G17
SE5
NW10
W7
G11

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi69 minVar 310.00 miFair70°F59°F68%1019.9 hPa

Wind History from HOG (wind in knots)
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Last 24hrSE6SE7S4S3CalmNE6SE3CalmE9
G20
E14
G23
E19
G23
E14
G24
E14
G24
NE19
G24
NE15
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G22
NE15NE13
G24
E10E3SE5E63Calm
1 day agoSE7E4CalmSE7S3SE8S3SE6E10
G19
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G24
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G23
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3W7SE6E6SE7SE6SE6S5
2 days agoNE9NE14
G23
NE12
G23
NE14NE12
G17
SE9NE15
G27
S44NE22
G30
NE20
G29
NE23
G31
NE25
G33
NE20
G35
E22
G34
NE20
G35
E19
G29
E15
G25
E13
G23
E9
G16
SE6CalmE4SE6

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Wed -- 03:07 AM HST     2.03 feet High Tide
Wed -- 06:21 AM HST     Sunrise
Wed -- 07:47 AM HST     Moonrise
Wed -- 09:24 AM HST     -0.29 feet Low Tide
Wed -- 03:52 PM HST     2.18 feet High Tide
Wed -- 06:39 PM HST     Sunset
Wed -- 08:42 PM HST     Moonset
Wed -- 09:55 PM HST     0.27 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.921.91.610.5-0-0.3-0.20.10.61.21.72.12.221.61.20.70.40.30.4

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Wed -- 04:58 AM HST     1.67 feet High Tide
Wed -- 06:21 AM HST     Sunrise
Wed -- 07:48 AM HST     Moonrise
Wed -- 10:54 AM HST     -0.19 feet Low Tide
Wed -- 05:40 PM HST     2.07 feet High Tide
Wed -- 06:39 PM HST     Sunset
Wed -- 08:42 PM HST     Moonset
Wed -- 11:45 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.50.91.31.61.71.61.20.80.3-0.1-0.2-00.30.81.31.822.11.91.510.50.2

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 (7,2,3,4)
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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.