Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Maalaea, 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 9:15 AM HST (19:15 UTC) Moonrise 7:48AMMoonset 8:42PM Illumination 6% 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
    EDIT      (on/off)   Help
PHZ119 Maalaea Bay- 338 Am Hst Wed Mar 29 2017
Today..Northwest winds 15 kt. Wind waves 2 ft or less. Isolated showers through the day.
Tonight..North winds 15 kt. Wind waves 2 ft or less. Isolated showers.
Thursday..Northwest winds 10 kt. Wind waves 2 ft or less. Isolated showers.
Thursday night..North winds 15 kt. Wind waves 2 ft or less. Isolated showers.
Friday..North winds 20 kt. Wind waves 2 ft or less. Isolated showers in the morning.
Friday night..North winds to 25 kt. Wind waves 2 ft or less then 3 ft after midnight. Isolated showers through the night.
Saturday..North winds to 25 kt. Wind waves 3 to 4 ft. Scattered showers.
Sunday..North winds to 25 kt. Wind waves 4 ft.
PHZ100 338 Am Hst Wed Mar 29 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 Maalaea, HI
   Hourly   EDIT   Help
location: 20.78, -156.47     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxhw60 phfo 291400
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Wed mar 29 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
A loose area of clouds and showers embedded in a mainly moderate
trade wind flow have been affecting mainly windward maui and big
island this early Wednesday morning. Otherwise, it has been a
rather dry evening for the remaining islands. But as more shower
bearing clouds roll in from the east, the showers will eventually
reach kauai by this evening. The clouds and showers are part of a
much larger area of scattered to broken low clouds that stretched
beyond a thousand miles east of the big island. It will take
until Friday morning for this batch of moisture to finally blow
through.

In addition to the trade showers, a tinge of weakness of the
slightly south of east wind flow over the western half of the
island chain will favor some afternoon clouds and a few showers
for the lee and interior areas of the smaller islands. We
anticipate a repeat of this pattern for both Thursday and Friday
afternoons.

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 by a
broad surface low. The extension of the surface ridge from the
high will be suppressed southward closer to the islands which
will then lead to a weaker trade wind flow by Wednesday. 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. Low clouds, and 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.

Marine
The latest surface analysis showed a 974 mb storm-force low
centered around 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 where a large area of west-northwest storm-force
winds (focused within the 290 to 310 directional band relative to
the islands) were shown out to around 500 nm south-southwest from
the low to near 30n (leading edge of the fetch was around 1200 nm
northwest of the islands). According to the latest altimeter
passes, seas associated with this system continue to range from 30
to 36 ft over the heart of the fetch region focused toward the
islands, which has been persistent for the past several passes
over the past 24 hrs. Despite some small differences between
solutions, the latest model guidance remains in decent agreement
with these latest satellite trends and shows this system
continuing on an east-northeast track from the date line early
this morning around 40n to the gulf of alaska through the second
half of the week.

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 through Thursday due
to a lingering northwest swell from earlier this week.

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
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 8 mi45 min NNE 8.9 G 11 76°F 77°F1020 hPa
51205 17 mi36 min 76°F6 ft
51203 - Kaumalapau, HI (146) 29 mi30 min 78°F4 ft
51202 - Mokapu Point, HI (098) 78 mi41 min 76°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last
24hr
NE15
G19
NE14
G19
NE14
G17
NE16
G20
NE15
G20
NE15
G23
NE16
G20
NE15
G19
NE15
G20
NE16
G21
NE10
G15
E5
G8
E4
S3
NE8
G11
NE3
G6
SE1
N7
E4
E2
G5
N6
N9
G14
N9
G13
NE11
G14
1 day
ago
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
SE2
NW5
NE1
SE1
NW8
G12
NW2
N3
SE4
NW2
2 days
ago
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
NW8
NE5
N2
G5
NW11
NW6
NW6
S1
SW1
SE4
G10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi21 minENE 12 G 1910.00 miA Few Clouds85°F63°F48%1020.4 hPa
Lahaina - West Maui, HI19 mi25 minVar 615.00 miA Few Clouds77°F62°F61%1020.3 hPa

Wind History from HOG (wind in knots)
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last 24hrE9
G20
E14
G23
E19
G23
E14
G24
E14
G24
NE19
G24
NE15
G20
NE15
G22
NE15NE13
G24
E10E3SE5E63CalmN4NE10
G14
NE3SE6SE4CalmE4E12
G19
1 day agoE10
G19
E15
G22
E14
G24
E14
G23
E13
G22
E14
G23
E18
G24
E12
G19
3W7SE6E6SE7SE6SE6S5SE6SE7S4S3CalmNE6SE3Calm
2 days ago4NE22
G30
NE20
G29
NE23
G31
NE25
G33
NE20
G35
E22
G34
NE20
G35
E19
G29
E15
G25
E13
G23
E9
G16
SE6CalmE4SE6SE7E4CalmSE7S3SE8S3SE6

Tide / Current Tables for Kihei, Maui (Hawaii)
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
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

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
   EDIT      (on/off)   Help   One Week of Data
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

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (15,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Kohala, HI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.