Friday, July21, 2017 L-36.com


Marine Weather and Tides
Haiku-Pauwela, 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 5:55AMSunset 7:09PM Friday July 21, 2017 12:50 PM HST (22:50 UTC) Moonrise 4:12AMMoonset 5:47PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 944 Am Hst Fri Jul 21 2017
.small craft advisory in effect through early Saturday morning...
Rest of today..North winds to 25 knots. Wind waves 3 feet. Isolated showers in the afternoon.
Tonight..North winds to 25 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Saturday..North winds to 25 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Saturday night..North winds to 25 knots. Wind waves 2 feet or less.
Sunday..Northeast winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Sunday night..North winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Monday..North winds 15 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..East winds 10 knots becoming northeast 20 knots. Wind waves 2 feet or less.
PHZ100 944 Am Hst Fri Jul 21 2017
Synopsis for hawaiian coastal waters.. Surface high pressure far north of the state will maintain moderate to locally strong trade winds through tonight. The trade winds are expected to become weaker this weekend as the remnants of tropical cyclone fernanda approach the area. East swells from fernanda will continue to spread across most of the coastal waters into early next week.

7 Day Forecast for Marine Location Near Haiku-Pauwela, HI
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location: 20.92, -156.28     debug


Area Discussion for -
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Fxhw60 phfo 212017
afdhfo
area forecast discussion
national weather service honolulu hi
1017 am hst Fri jul 21 2017

Synopsis
A surface ridge of high pressure far to our north will keep
breezy trades blowing today. The trades will ease over the
weekend as weakening fernanda approaches the waters to our
northeast. An upper level trough is expected to form close to the
islands today, bringing with it a period of unsettled weather
through early next week.

Discussion
The synoptic pattern is rather complex with several players that
look to be affecting our weather the next few days. The current
breezy trades are being driven by a nearly stationary surface
ridge about 850 miles or so N of honolulu. Meanwhile, at 5 am,
cphc analyzed the center of tropical storm fernanda about 750 mi e
of hilo, and continuing to move toward the w. A band of peripheral
moisture which has pushed far out ahead of fernanda is currently
traversing the islands from maui county to the big island. Finally,
a digging mid-level trough is evident on water vapor imagery about
700 mi NW of kauai.

At the surface, the ridge to the N weakens and moves slowly s
over the next couple of days, replacing today's breezy trades with
more gentle to locally breezy winds this weekend. Based on the
latest cphc forecast, fernanda is expected to continue to move
toward the W or wnw and weaken, becoming a remnant low Saturday
afternoon. The latest track takes the remnant low just N of the
islands Sun night into mon. It should be noted that the cphc
forecast track is much closer to the ECMWF than the gfs, which
unrealistically takes a stronger fernanda much farther N of the
islands. The cphc forecast would likely imply a period of much
weaker winds as the remnant of fernanda passes N of us. After
that, we should see breezy trades return, thanks to a large
surface high which at that time will be parked about 1400 mi NE of
hawaii.

The cimss mimic total precipitable water loop shows that the
aforementioned band of moisture affecting the islands this am is
the leading edge of a fairly large area of very moist, tropical
air which extends all the way to fernanda and beyond. It will get
more humid and uncomfortable today, then worsen over the weekend
and through Monday when dewpoints will reach the lower to middle
70s, tpw will climb to over 1.75 inches, and k-indices will exceed
30. The weak but digging mid-level trough to the NW of the
islands may help to put the moist air to work, with some localized
heavier showers expected. Will take a look at the new cphc
forecast, as well as the latest model guidance, and may consider
adding heavy showers or thundershowers for what appear to be the
higher threat areas and time periods in time for this afternoon's
forecast package.

More settled trade wind weather should return about Tuesday, as
mid level ridging and drier air build in, in the wake of ex-
fernanda.

Aviation
Locally strong trade winds will continue today. Airmet tango for
low level turbulence remains in place over and immediately south
through west of the mountains. Winds will begin to ease up
slightly this evening into Saturday. Airmet tango will need to be
revisited at that time.

The trade wind pattern will help focus clouds and showers over
the windward and mountain areas. Enhanced moisture moving through
the eastern islands this morning prompted an airmet sierra for
mountain obscuration along the north and east facing slopes of the
big island and maui. We should start to see some improvement this
afternoon for these areas, as the moisture moves to the west.

Airmet sierra may need to be expanded to cover the western islands
this evening tonight.

Marine
Locally strong trade winds will continue to produce small craft
advisory conditions through early Saturday morning for the
typically windy waters around maui county and the big island.

The latest forecast for tropical storm fernanda issued by the
central pacific hurricane center at 5 am hst Thursday continues
to indicate the tropical cyclone will weaken to a remnant low that
may eventually move to a position northeast of the big island
Sunday afternoon. As this area of lower pressure approaches the
region, expect the trade winds to weaken this weekend. The
background flow will likely become much lighter early next week as
the remnants of fernanda pass by to the north of the islands
beginning late Sunday and continuing through Tuesday.

A high surf advisory remains in effect for the east facing shores
of the big island and maui through early Saturday morning due to
a mid- to long-period east swell associated with a captured fetch
from when fernanda was a major hurricane. Wave model guidance
indicates reinforcing east swell energy from fernanda arriving
along the east facing shores later today and tonight. Note that as
this reinforcing swell continues to spread westward to the
remainder of the smaller islands, a high surf advisory will likely
be needed for east facing shores of molokai, oahu and kauai over
the weekend.

The largest high tides of the month (king tides) will occur each
afternoon during the next few days. Note that these abnormally
high tides combined with wave run up due to the east swells
produced by fernanda may result in coastal flooding in some areas,
through Monday.

Elsewhere, no significant swells are expected. Small south swells
will continue to produce background surf along south facing shores
through the weekend and on into next week.

Over the offshore waters, there will be a chance of isolated
thunderstorms over portions of the area from Saturday through
Monday as and upper trough, along with increased moisture from
fernanda move across the area.

Hfo watches warnings advisories
High surf advisory until 6 am hst Saturday for windward
haleakala-south big island-big island north and east.

Small craft advisory until 6 am hst Saturday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

R ballard eaton burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi50 min NNE 15 G 19 76°F 80°F1017.3 hPa (-0.7)
51205 10 mi71 min 80°F7 ft
51202 - Mokapu Point, HI (098) 82 mi46 min 80°F7 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE18
G24
NE18
G26
NE21
G27
NE19
G25
NE19
G25
NE16
G25
NE12
G16
NE11
G14
NE10
NE8
G11
NE9
G14
NE9
NE6
G10
NE14
G20
N9
G13
NW7
G10
NE9
E8
G17
NE6
G11
NE8
G14
NE8
G13
NE12
G16
NE15
G21
NE15
G19
1 day
ago
NE15
G21
NE17
G23
NE19
G25
NE19
G24
NE18
G23
NE19
G25
NE15
G20
NE15
G21
NE12
G18
NE17
G22
NE8
N13
NE15
G20
NE12
G18
NE15
G19
NE16
NE14
G21
NE12
G17
NE15
G20
NE12
G20
NE16
G21
NE15
G21
NE16
G24
NE19
G25
2 days
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NE17
G22
NE22
NE18
G23
N19
G23
N15
NE16
G20
NE18
G22
NE11
G15
NE14
G17
NE13
G16
NE10
G15
NE15
G20
NE7
G11
NE3
G8
NE12
NE11
N8
G11
NE8
G12
NE9
G12
NE7
G11
NE7
G12
NE17
G23
NE15
G20
NE17
G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI8 mi56 minNE 20 G 2710.00 miMostly Cloudy and Breezy81°F70°F69%1017.3 hPa
Lahaina - West Maui, HI20 mi65 minNE 10 G 1710.00 miMostly Cloudy79°F68°F70%1017.6 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE17
G30
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NE10NE11NE9NE6NE8NE6NE13NE8N6NE8NE7NE7NE10
G22
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E15
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NE24
G30
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G27
1 day agoE18
G27
E21
G26
NE21
G26
E19
G30
NE18
G25
NE15
G23
NE11
G20
NE12
G20
NE12NE15
G19
NE8NE15NE10
G18
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G20
NE14NE13
G21
NE16NE12NE11
G19
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G25
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G26
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NE22
G30
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G31
2 days agoNE19
G31
NE24
G30
NE19
G27
NE21
G26
NE19
G27
NE18
G26
NE14
G22
E14
G22
E14
G19
NE10E6E11E3E3NE11NE13NE9NE6E11E12NE11NE17
G23
NE20NE18
G27

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 04:13 AM HST     Moonrise
Fri -- 05:55 AM HST     Sunrise
Fri -- 06:33 AM HST     -0.50 feet Low Tide
Fri -- 02:00 PM HST     2.81 feet High Tide
Fri -- 05:47 PM HST     Moonset
Fri -- 07:08 PM HST     Sunset
Fri -- 08:30 PM HST     0.76 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.310.70.2-0.2-0.5-0.5-0.20.30.91.62.32.72.82.72.31.81.410.80.80.91.2

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Fri -- 02:11 AM HST     1.15 feet High Tide
Fri -- 04:13 AM HST     Moonrise
Fri -- 05:56 AM HST     Sunrise
Fri -- 07:37 AM HST     -0.23 feet Low Tide
Fri -- 03:03 PM HST     2.81 feet High Tide
Fri -- 05:47 PM HST     Moonset
Fri -- 07:08 PM HST     Sunset
Fri -- 09:51 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.811.11.10.80.50.1-0.2-0.200.411.72.22.62.82.72.31.71.10.60.30.20.3

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 (18,4,5,8)
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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.