Monday, July24, 2017 L-36.com


Marine Weather and Tides
Maalaea, HI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 5:56AMSunset 7:08PM Monday July 24, 2017 6:47 AM HST (16:47 UTC) Moonrise 7:22AMMoonset 8:32PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 330 Am Hst Mon Jul 24 2017
Today..North winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated heavy showers.
Tonight..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Tuesday..Northeast winds to 25 knots. Wind waves 2 feet or less.
Tuesday night..Northeast winds to 25 knots. Wind waves 2 feet or less.
Wednesday..North winds to 25 knots. Wind waves 2 feet or less.
Wednesday night..Northeast winds to 25 knots. Wind waves 3 feet.
Thursday..North winds 20 knots. Wind waves 3 feet.
Friday..Northeast winds 20 knots. Wind waves 2 feet or less.
PHZ100 330 Am Hst Mon Jul 24 2017
Synopsis for hawaiian coastal waters.. A surface high will remain nearly stationary far northeast of the islands through the forecast period. A trough will pass east to west over the island chain through today. The trough will move west of kauai by early Tuesday with trade winds strengthening in its wake.

7 Day Forecast for Marine Location Near Maalaea, HI
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location: 20.78, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 241347
afdhfo
area forecast discussion
national weather service honolulu hi
347 am hst Mon jul 24 2017

Synopsis
A trough of low pressure, the remnants of fernanda, will be moving
east to west across oahu and kauai today. The trough will
interrupt our trades statewide with muggy conditions and the
possibility of heavy showers or thunderstorms. More settled
conditions should start to return tonight as drier air and more
stable air return. Breezy trades, more sunshine, and less humid
conditions are expected for the rest of the week as high pressure
well to the north of the state regains control of our weather.

Discussion
A surface trough, the remnants of former hurricane fernanda, is
moving across the islands this morning. Satellite-derived low
level wind fields indicate the trough axis was over maui county
during the predawn hours, moving toward the W at about 13 kt.

Winds ahead of the trough are breezy trades, but the background
flow transitions to breezy S to SE behind the trough. The 12z
soundings show a moist and unstable airmass over the state,
mlcape ranging from about 800 j kg at lihue to 1200 j kg at hilo,
with even higher instability likely present between the sounding
sites. This moisture and instability are interacting with an
upper trough located just the W and NW of the islands, and
scattered showers and thunderstorms have blossomed over the last
few hours to the N of maui co and E through NE of oahu.

As the surface trough continues westward today, winds will go
light and variable over kauai and oahu, with southerlies becoming
southeasterly elsewhere. Can't rule out heavy downpours or
thunderstorms moving ashore this morning on kauai and oahu, with
the possibility of more heavy showers or thunderstorms blowing up
over the island interiors this afternoon. The mid-level support
is fairly weak and the surface trough is moving right along, so if
heavy showers or thunderstorms do occur, they are not expected to
last too long in any one location.

After today the weather should quiet down fairly quickly, as the
deep tropical moisture and instability associated with ex-
fernanda departs to the nw. The low level flow will return to
regularly scheduled summertime breezy trades by Tuesday, moisture
will decrease, and the trough aloft will weaken further. Fewer
showers are expected overall beyond today, but some of the models
are showing an modest increase in low level trade wind moisture
thu night through Fri night. Have increased pops a little for this
time period. A sprawling, persistent area of high pressure to the
north of the islands will keep breezy trades blowing locally into
the weekend.

Aviation
The remnant low associated with former tropical cyclone fernanda
continues to move through the hawaiian islands this morning.

Expect scattered to numerous showers through the morning hours
along with scattered MVFR conditions mainly along northeastern
slopes of all islands. Isolated thunderstorms will develop around
the remnant low center near molokai, oahu and kauai.

An airmet for ifr conditions for molokai and an airmet for tempo
mountain obscuration in effect for lanai and the north and eastern
slopes of molokai and oahu. This airmet may need to be expanded
to include kauai later this morning as the low ceilings and
showers spread westward.

Marine
High pressure centered far northeast of the islands will support
trade winds through the forecast period. A surface trough will
pass east to west over the island chain through today, which will
cause the trade winds to temporarily weaken. Stronger trade winds
will begin filling in across the eastern end of the state as
early as later today. The trade winds will strengthen to small
craft advisory levels by Tuesday morning for the typically windy
zones around maui county and the big island.

One final large high tide of the month will occur tonight. This
tide may result in coastal flooding in some areas. A special
weather statement (see spshfo product on our website) is posted to
highlight the potential hazards.

Moisture associated with the incoming surface trough will interact
with a broad upper air feature near the islands through the day.

This interaction could result in isolated thunderstorms over
coastal and offshore waters through tonight (and possibly through
Tuesday for the western offshore waters).

Hfo watches warnings advisories
None.

R ballard bohlin kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 8 mi48 min SSW 12 G 15 79°F 80°F1012.7 hPa (+0.5)
51205 17 mi39 min 80°F6 ft
51202 - Mokapu Point, HI (098) 78 mi44 min 80°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE9
G13
NE8
G14
NE18
NE17
G22
NE9
G17
N6
G16
N12
G15
N13
G17
N11
G15
N12
G15
N12
G15
N8
G11
NE8
G19
N10
N7
G10
NE6
G11
N6
G9
NW7
NW2
S3
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S11
G14
SW11
G14
SW12
G15
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NE11
G16
N5
G11
NE13
G20
NE15
G19
NE18
G23
NE16
G21
NE17
G22
NE14
G22
NE15
G19
NE15
G20
NE18
G22
NE17
G21
NE14
G22
NE10
G14
NE11
G14
NE10
G15
NE10
N8
NE9
NE10
G16
NE11
G15
NE10
NE8
G14
NE15
2 days
ago
NE6
G11
NE8
G14
NE8
G13
NE12
G16
NE15
G21
NE15
G19
N10
NE14
G17
NE14
G19
NE13
G17
NE14
G19
NE16
G22
NE13
G19
NE9
G13
NE10
G13
NE11
G15
E6
G11
NE7
G13
NE9
G13
NE10
NE14
G20
NE12
G16
NE10
G16
NE11
G16

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi54 minS 710.00 miA Few Clouds75°F73°F94%1013.3 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE11
G17
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NE14
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NE21NE20NE19NE20NE19NE18NE14NE11NE10NE13NE8NE10
G21
NE8NE8N6S4S3SW11SW8
G17
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1 day agoNE104E10
G21
NE16
G24
NE18
G24
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G26
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G24
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G22
NE17
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G24
E10NE10NE9
G17
NE9N7NE8NE6NE8NE8NE9NE11
2 days agoNE7NE10
G22
E11
G22
E15
G21
NE24
G30
NE20
G27
NE17
G23
NE17
G26
E15
G20
E14
G25
NE14
G23
NE18
G24
NE13NE9NE9NE7NE9
G16
E10NE9E8E12
G21
NE14E5NE10

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Mon -- 04:47 AM HST     1.23 feet High Tide
Mon -- 05:57 AM HST     Sunrise
Mon -- 07:22 AM HST     Moonrise
Mon -- 10:01 AM HST     -0.06 feet Low Tide
Mon -- 05:14 PM HST     2.68 feet High Tide
Mon -- 07:07 PM HST     Sunset
Mon -- 08:32 PM HST     Moonset
Mon -- 11:55 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
0.20.40.711.21.21.10.80.40.1-0.10.10.40.91.52.12.52.72.62.21.71.10.50.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 02:31 AM HST     1.50 feet High Tide
Mon -- 05:57 AM HST     Sunrise
Mon -- 07:22 AM HST     Moonrise
Mon -- 08:43 AM HST     -0.45 feet Low Tide
Mon -- 03:53 PM HST     2.81 feet High Tide
Mon -- 07:07 PM HST     Sunset
Mon -- 08:31 PM HST     Moonset
Mon -- 10:24 PM HST     0.56 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.31.51.51.30.90.4-0.1-0.4-0.4-0.20.30.91.72.32.72.82.62.21.71.20.80.60.6

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 (12,3,4,5)
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Ground Weather Radar Station Kohala, 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.