Thursday, July20, 2017 L-36.com


Marine Weather and Tides
Hanamaulu, 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 6:00AMSunset 7:17PM Thursday July 20, 2017 12:45 PM HST (22:45 UTC) Moonrise 3:25AMMoonset 4:59PM Illumination 8% Phase: Waning Crescent; Moon at 27 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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PHZ111 Kauai Windward Waters- 950 Am Hst Thu Jul 20 2017
Rest of today..East winds 20 knots. Wind waves 5 feet. East swell 3 feet. Scattered showers late in the morning, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 5 feet. East swell 3 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 4 feet. East swell 4 feet. Isolated showers.
Friday night..East winds 15 knots. Wind waves 4 feet. East swell 5 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 4 feet. East swell 5 feet. Scattered showers.
Saturday night..East winds 15 knots. Wind waves 3 feet. East swell 5 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 3 to 4 feet. East swell 5 feet. Scattered showers.
Monday..East winds 10 knots. Wind waves 3 feet. East swell 4 to 5 feet. Scattered showers.
PHZ100 950 Am Hst Thu Jul 20 2017
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain moderate to locally strong trade winds through Friday night, with a slight weakening expected this weekend. East swells from a weakening tropical cyclone fernanda are forecast to spread across most of the coastal waters into early next week.

7 Day Forecast for Marine Location Near Hanamaulu, HI
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location: 22, -159.33     debug


Area Discussion for -
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Fxhw60 phfo 201939
afdhfo
area forecast discussion
national weather service honolulu hi
939 am hst Thu jul 20 2017

Synopsis
A persistent ridge to our north will keep breezy trades blowing
through Friday. The trades will ease this weekend as the ridge
weakens. Tropical moisture will overspread the islands this
weekend, leading to higher humidity and an increase in showers.

The remnants of fernanda are expected to pass just north of the
islands on Monday, likely weakening our winds, and introducing
muggy conditions.

Discussion
A ridge of high pressure extends from a 1031 mb high near 40n180w
through 35n155w and 33n140w, far north of the main hawaiian
islands. This ridge has been a fixture with our weather for the
past few days, keeping trades on the breezy side and pushing
clouds and showers across windward and mauka areas. We expect this
pattern to persist through Friday. Troughing north of the ridge
will dig southward by this weekend, putting a dent in the ridge
between 160w and 180w, which will result in weakened trades for
the islands.

Tropical storm fernanda is about 1000 miles east of hilo as of
this writing, weakening as it is poised to cross 140w. Satellite
loop shows skies across the main hawaiian islands are clearing
somewhat this morning, but increased tropical moisture ahead of
fernanda is noted east of about 152w. Fernanda is forecast to pass
north of the islands on Monday, but the eastern edge of the low
cloud field which merges with that of fernanda's will reach the
eastern islands tonight. Also, models show an increase in deep
moisture for the eastern end of the state on Friday which will
bring an increase in trade wind showers there, with dry trade
wind weather expected to continue across the central and western
islands.

While trade winds are forecast to decrease Friday night through
the weekend, we still expect increased clouds and showers
associated with fernanda to favor windward and mauka areas.

However, leeward showers may develop at times during the
afternoons if local sea breezes form.

As the remnants of fernanda pass by to the north of the islands
on Monday, trade winds will weaken further and sea breeze
development is expected across most areas. This light wind regime,
with overnight land breezes and daytime sea breezes, may continue
into Tuesday before the remnants of fernanda pass by and high
pressure strengthens north of the state. Breezy trade winds will
then return by the middle of next week. Models show the main
area of moisture associated with fernanda will pass north of the
islands on Monday but, with the humid conditions and light winds
in place, afternoon and evening showers are expected particularly
over the interior of the islands during the first half of next
week. A drier, less humid, and more stable airmass is then
expected to return by the middle of next week.

Aviation
Moderate to breezy trade winds will persist as a high pressure
ridge remains far to the north of the islands. Brief MVFR
conditions, lower ceilings and passing showers, will mainly
affect windward areas.

With the occasionally strong trades, an airmet is currently posted
for moderate low level turbulence over and lee of all mountains.

Marine
Small craft advisory (sca) conditions can be expected for waters
south of the big island, all waters around maui county, and waters
south of oahu through early Friday morning, and the typically
windier waters around maui county and the big island through early
Saturday morning.

A rapidly weakening tropical storm fernanda is forecast to pass
just north of the islands from Sunday through late Monday. The
wind forecast at this time continues to carry light to moderate
trade winds.

A high surf advisory is in place for the east facing shores of
the big island and maui through this afternoon due to a mid- to
long- period east swell associated with a captured fetch from when
fernanda was a major hurricane. Guidance shows this swell
subsiding later today, but continues to indicate reinforcing east
swells from fernanda arriving along the east facing shores from
as early as Friday. High surf advisory conditions for the east
facing shores will become likely again for the big island Friday
or Saturday and spread west to the smaller islands. The current
high surf advisory will need to be revisited later today.

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

Elsewhere, no significant swells are expected. Small south swells
will continue to produce small background surf along south facing
shores into next week.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening 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.

Small craft advisory until 6 am hst Friday for oahu leeward
waters-kaiwi channel-maui county windward waters-maui county
leeward waters.

Discussion... Powell
aviation... Kinel
marine... Eaton


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 3 mi46 min ENE 13 G 17 80°F 1019.5 hPa (+0.0)
51208 24 mi54 min 80°F6 ft
51201 - Waimea Bay, HI (106) 68 mi44 min 78°F5 ft

Wind History for Nawiliwili, HI
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Last
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E15
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NE9
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NE14
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G16

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI2 mi53 minENE 1410.00 miMostly Cloudy85°F72°F65%1019.7 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI24 mi50 minWSW 510.00 miOvercast83°F69°F63%1018.7 hPa

Wind History from HLI (wind in knots)
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Last 24hrE13E15E12E12NE14NE13E15NE13NE14NE16NE15NE15NE16NE13NE14NE14NE14E15NE15NE12NE14E17NE13
G21
E14
1 day agoNE10NE9NE11NE13NE11NE11NE12NE11NE12NE12NE12E12E12NE10E10NE10NE10NE11NE12E10E13E14E14E15
2 days agoNE17NE16NE18
G26
NE15NE15NE18NE16NE13NE13NE16NE17
G21
--NE15NE17
G21
NE14NE14NE15NE13NE12NE13NE11NE13NE12E11

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Thu -- 12:45 AM HST     0.76 feet High Tide
Thu -- 03:24 AM HST     Moonrise
Thu -- 06:05 AM HST     Sunrise
Thu -- 06:34 AM HST     -0.19 feet Low Tide
Thu -- 02:08 PM HST     2.29 feet High Tide
Thu -- 04:58 PM HST     Moonset
Thu -- 07:22 PM HST     Sunset
Thu -- 09:10 PM HST     0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.80.70.50.2-0-0.2-0.2-00.30.81.31.82.12.32.21.91.51.10.70.40.30.30.4

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Thu -- 03:25 AM HST     Moonrise
Thu -- 05:08 AM HST     -0.19 feet Low Tide
Thu -- 06:05 AM HST     Sunrise
Thu -- 12:57 PM HST     2.39 feet High Tide
Thu -- 04:59 PM HST     Moonset
Thu -- 07:23 PM HST     Sunset
Thu -- 07:44 PM HST     0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.70.50.2-0.1-0.2-0.10.10.511.522.32.42.31.91.410.60.30.30.40.50.7

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 Kauai, 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.