Monday, October23, 2017 L-36.com


Marine Weather and Tides
Princeville, 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 6:30AMSunset 6:02PM Sunday October 22, 2017 8:11 PM HST (06:11 UTC) Moonrise 9:10AMMoonset 8:34PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 329 Pm Hst Sun Oct 22 2017
Tonight..Winds variable less than 10 knots becoming southwest 10 knots after midnight. Wind waves 3 feet. Northwest swell 7 feet. Haze. Scattered heavy showers.
Monday..Southwest winds 15 knots. Wind waves 5 feet. Northwest swell 6 feet. SWell south 3 feet. Haze. Scattered heavy showers and isolated Thunderstorms.
Monday night..Northwest winds 15 knots. Wind waves 6 feet. Northwest swell 7 feet increasing to 9 feet after midnight. SWell south 3 feet. Heavy showers likely and isolated Thunderstorms.
Tuesday..North winds 15 knots. Wind waves 6 feet. Northwest swell 11 feet and south 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..North winds 15 knots. Wind waves 4 feet. Northwest swell 12 feet. SWell south 3 feet. Isolated showers.
Wednesday..North winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 4 feet. North swell 11 feet.
Wednesday night..North winds 10 knots. Wind waves 4 feet. North swell 10 feet.
Thursday..Northeast winds 10 knots. Wind waves 3 to 4 feet. Northwest swell 8 to 10 feet. Scattered showers.
Friday..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 10 to 11 feet. Scattered showers.
PHZ100 329 Pm Hst Sun Oct 22 2017
Synopsis for hawaiian coastal waters.. A front northwest of the area is moving southeastward toward the main hawaiian islands. The front is expected to start affecting kauai waters Monday night and will sweep across the island chain, reaching the big island waters on Tuesday. Thunderstorms will be possible ahead of and along the front. A large northwest swell will move into the area starting Tuesday. A new high will build far northwest of the area by the middle of the week.

7 Day Forecast for Marine Location Near Princeville, HI
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location: 22.22, -159.48     debug


Area Discussion for -
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Fxhw60 phfo 230220
afdhfo
area forecast discussion
national weather service honolulu hi
420 pm hst Sun oct 22 2017

Synopsis
Tonight through Tuesday, southerly winds ahead of a front will
bring deep tropical moisture with the potential for heavy rain and
flooding, mainly from oahu to the big island. The front will reach
kauai Monday with cool and dry air following as it moves down the
island chain. The front is expected to pass east of the big
island Wednesday night with dry northeast flow forecast for the
second half of the week.

Discussion
A front approaching from the northwest has pushed a surface ridge
over the islands allowing for light and variable winds tonight.

Near and over the big island, southeasterly winds, increasing
humidity, and afternoon convection has set off some persistent
showers and isolated thunderstorms along the lower slopes from
hilo through the puna and kau districts. Heavier showers will
continue over the eastern half of the big island tonight and start
to fill into oahu and maui county late tonight and early Monday
morning.

As the front approaches kauai tonight and Monday, a moisture
convergence band is expected to form over oahu, maui county, and
the big island. The near surface convergence, deep tropical
moisture, and island terrain will produce areas of heavy rain,
isolated thunderstorms, and the potential of flash flooding over
oahu, maui county, and the big island Monday through Tuesday. A
flash flood watch is in effect starting Monday morning and
continues through Tuesday afternoon. Sufficient deep layer shear,
as well as turning of the winds with height in the lower levels,
suggest that some of those isolated thunderstorms could be strong
or severe along and ahead of the front. Strong winds across the
big island summits are expected Monday night and a high wind watch
is in effect. Some wintry weather is also possible over the big
island summits with temperatures approaching freezing Monday
night.

Kona winds (southerly) will increase Monday with some potential
for gusty winds accelerating down the terrain into windward areas
of kauai and oahu. The front will push over kauai Monday night
bringing moderate rain with the heaviest falling over the north
and west facing slopes of the garden isle. The front will push the
aforementioned convergence band slowly eastward, likely pushing
east of oahu Tuesday, and then east of the big island sometime
Wednesday. North winds behind the front will bring cool and dry
conditions to kauai Tuesday, and oahu Tuesday night; while the
convergence band keeps things moist and humid over maui county and
the big island.

High pressure nosing in from the northwest is expected to push the
convergence band east of the big island Wednesday with dry north
to northeast flow expected for the second half of the week.

Aviation
Convective development over island interiors will intensify this
evening as the inversion aloft begins to break down. Shower
activity will likely become heavy at times, especially over the
southern half of the island chain where the greatest air mass
instability is anticipated.

Isolated MVFR conditions possible in showers, otherwiseVFR
conditions should prevail through the evening hours. More
frequent MVFR or even ifr conditions could develop late tonight,
especially for eastern slopes and coasts of the big island. An
airmet for mountain obscuration may become necessary.

A cold front approaching out of the northwest will further
destabilize the airmass and encourage shower activity statewide
on Monday. Reduced ceilings and visibilities will likely spread to
the remaining islands, possibly as early as Monday morning.

Marine
The morning ascat pass showed light to moderate southeasterlies
over most of the coastal waters and moderate trades south of the
big island. The winds should continue to veer through tonight
and become southerlies or southwesterlies by Monday in response to
a front moving toward the island chain from the northwest. The
front is expected to reach kauai waters by Monday evening and
will move down the island chain, reaching big island waters on
Tuesday. Heavy showers and thunderstorms are possible mainly to
the east of and along the front. Some of the thunderstorms may be
strong enough to warrant special marine warnings, especially over
maui county and big island waters. A brief period of fresh to
locally strong northerly winds is forecast to occur after the
front passes but should become light to moderate northerlies by
Wednesday. Winds are forecast to become light to moderate
northeasterlies Thursday and persist through the remainder of the
week.

Buoy reports and observations show that the expected northwest
swell is filling in across the area. Surf is expected to peak
tonight close to the advisory threshold along north facing
shores then diminish Monday. A bigger northwest swell on Tuesday
and Wednesday will likely produce surf well above the advisory
threshold for north and west facing shores. The swell will also
boost combined seas above the 10 foot level, so a small craft
advisory will likely be needed. An even larger northwest swell is
forecast to arrive Friday. That swell could produce warning level
surf along north and west facing shores.

A low east of new zealand generated a swell which will produce surf
near the advisory level along south facing shores later today and
Monday. See the collaborative surf discussion for details.

Hfo watches warnings advisories
Flash flood watch from Monday morning through Tuesday afternoon
for oahu-molokai-lanai-kahoolawe-maui-big island.

High wind watch from Monday evening through Tuesday afternoon
for big island summits.

Morrison... Discussion
kodama... Marine
bedal... Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi49 min 81°F7 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi41 min W 2.9 G 4.1 76°F 1015.6 hPa
51201 - Waimea Bay, HI (106) 82 mi39 min 78°F7 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi101 min 79°F 80°F1014.6 hPa72°F

Wind History for Nawiliwili, HI
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NE8
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NE13
G19
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NE12
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NE8
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G14
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N6
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G14
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G15
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G15
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G17
NE11
G14
E12
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NE11
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NE9
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NE7
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NE16
G23
NE14
G20
NE12
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G18
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NE13
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NE11
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NE15
G20
NE13
G20
NE14
G17
NE14
G19
NE10
G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi18 minWNW 610.00 miMostly Cloudy76°F70°F82%1016.1 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi15 minSE 310.00 miMostly Cloudy78°F72°F82%1016 hPa

Wind History from HLI (wind in knots)
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Last 24hrNE12NE11NE10E10NE9NE7W4W5NW4W6W6W5CalmNE5E6E7E7E7SE9S9S9S6SW5W6
1 day agoNE19
G31
NE19NE19NE18NE20NE19NE16NE16NE13NE16NE14N7NE12NE13NE12NE14NE12NE12NE12NE12NE12NE13NE12NE14
2 days agoNE18NE19NE22
G29
NE20
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NE20NE22
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NE19NE17NE16NE19NE19NE18NE16NE16NE19NE20N18NE17NE19NE18

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Mon -- 04:49 AM HST     2.00 feet High Tide
Mon -- 06:37 AM HST     Sunrise
Mon -- 10:00 AM HST     Moonrise
Mon -- 11:44 AM HST     0.54 feet Low Tide
Mon -- 04:39 PM HST     0.90 feet High Tide
Mon -- 06:06 PM HST     Sunset
Mon -- 09:18 PM HST     Moonset
Mon -- 09:41 PM HST     0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.11.51.8221.91.61.310.70.60.50.60.70.80.90.90.80.70.50.40.40.5

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Mon -- 06:00 AM HST     1.90 feet High Tide
Mon -- 06:37 AM HST     Sunrise
Mon -- 09:59 AM HST     Moonrise
Mon -- 01:10 PM HST     0.54 feet Low Tide
Mon -- 05:50 PM HST     0.80 feet High Tide
Mon -- 06:05 PM HST     Sunset
Mon -- 09:18 PM HST     Moonset
Mon -- 11:07 PM HST     0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.611.31.61.81.91.81.61.310.80.60.50.60.60.70.80.80.80.70.50.40.4

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 (2,6,7,8)
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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.