Wednesday, October18, 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 6:28AMSunset 6:05PM Wednesday October 18, 2017 6:52 AM HST (16:52 UTC) Moonrise 5:41AMMoonset 5:55PM 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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PHZ111 Kauai Windward Waters- 341 Am Hst Wed Oct 18 2017
.small craft advisory in effect through Thursday afternoon...
Today..East winds to 25 knots. Wind waves 8 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..East winds to 25 knots. Wind waves 9 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 9 feet. North swell 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..East winds 20 knots. Wind waves 9 feet. North swell 5 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 8 feet. North swell 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 7 feet. North swell 4 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 to 7 feet. Northwest swell 3 to 4 feet. Scattered showers.
Sunday..Southeast winds 10 knots becoming variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 to 7 feet. Haze. Scattered showers.
PHZ100 341 Am Hst Wed Oct 18 2017
Synopsis for hawaiian coastal waters.. Strong high pressure will remain north of the waters through Thursday, then weaken and shift eastward over the upcoming weekend as a front approaches from the northwest.

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 181345
afdhfo
area forecast discussion
national weather service honolulu hi
345 am hst Wed oct 18 2017

Synopsis
High pressure north of hawaii will keep a windy trade wind
pattern in place through the rest of the work week, with the
trades trending down slightly Friday and weakening further over
the weekend. Clouds and showers will favor windward and mauka
areas through the period, but showers will reach leeward areas
from time to time as well due to the strength of the trades.

Discussion
Windy conditions will continue to be the main weather player
across the state over the rest of the work week. High pressure
around 1030-1034 mb expected to remain to the north of the state
will continue to result in a pressure gradient supportive of
strong winds, locally up to wind advisory conditions with gusts
over 50 mph possible in the windiest areas around maui county and
the big island through late Thursday. Along with the winds,
pockets of showers riding along in the trades will continue to
pass over the state. The showers will focus over windward areas,
but occasionally carry to leeward areas due to the strong winds.

Rain totals will remain generally on the light side for both
windward and leeward areas.

The pattern is expected to shift as we go into the weekend. The
surface ridge to the north shifts eastward and is replaced by a
trough, which carves out from the mid latitude westerlies
somewhere to the north or northwest of the state by Sunday. Trades
become weak and begin to shift more southeasterly by Sunday and
more southerly on Monday. Most areas should be fairly dry
Saturday, but tropical moisture is expected to come up from the
southeast and spread over the state on Sunday (big island) and
Sunday night (smaller islands). The additional moisture will
provide more shower activity around the state, particularly as
sea breezes direct the showers onto the islands Sunday and Monday
afternoons. In addition, an upper trough will pass just north of
hawaii Monday through Tuesday night resulting in some possibly
heavier showers around the state during that time period.

Aviation
High pressure north of the state will keep windy trades in place
across the island chain through tonight. Clouds and showers will
favor windward and mauka areas, but will also spread leeward due
to the strength of the trades. Brief MVFR CIGS vsbys will be
possible in passing showers, but predominantlyVFR conditions are
expected through 12z Thursday.

Airmet tango is in effect for moderate upper level turbulence
between fl250 and fl400 due to a jet stream in the vicinity of
the islands. The upper level turbulence is expected to continue
through the morning hours, with some improvement expected this
afternoon.

Airmet tango is also in effect for moderate low level turbulence
over and downwind of the terrain of all islands. This airmet will
likely continue through Thursday night and possibly Friday.

Marine
Hazardous marine conditions will continue through Friday due to
strong- to gale-force trade winds and rough seas. Latest buoy
observations around the islands reflect this and are holding
within the 8 to 11 ft range. Heights within the 12 to 15 ft range
are likely occurring over the windier locations, especially across
the pailolo and alenuihaha channels and waters south of the big
island where the strongest winds are. Satellite altimetry data
within the past 12 hrs even showed wave heights up to 14 ft west
of kauai. Small craft advisory headlines will remain likely
through Friday over most waters. Gale conditions will likely hold
over the pailolo and alenuihaha channels through the day
Thursday.

The latest guidance lines up well with the current pattern and
depicts a weakness within the ridge axis developing north of the
islands over the upcoming weekend. This weakness will be in response
to a frontal boundary approaching from the northwest and a weak
surface trough approaching from the east. Trade winds are forecast
to respond and gradually trend down late Saturday through Sunday.

Seas will drop below advisory-levels (10 ft) through this time.

Surf along east facing shores will remain rough through the rest of
the week due to strong trades locally and upstream of the islands.

The high surf advisory for east facing shores will hold through
Wednesday and likely need to be extended through Thursday. A
downward trend is expected over the upcoming weekend due to the
aforementioned weakness developing within the ridge and a weak
trough moving into the area from the east.

Surf along south facing shores will continue to trend down through
Thursday as the south swell that peaked Monday eases. Mostly shorter-
period and small southeast energy will be expected Wednesday through
Friday. An upward trend is expected once again over the upcoming
weekend due to the ongoing active pattern over the southern
pacific within hawaii's swell window. Altimetry and ascat data
showed a gale- to storm-force low passing quickly from west to
east south of new zealand this past weekend with seas peaking
southeast of new zealand around 40 ft on Sunday. Wavewatch iii and
ecmwf-wave solutions reflect this and show long-period energy
arriving locally by Saturday, peaking Sunday, then slowly trending
down early next week out of 190-200 deg.

Mainly trade wind energy wrapping into the typical locations are
expected for surf along north facing shores into Thursday. A long-
period north-northwest (340 deg) swell associated with a storm-
force low passing from west to east across the far northern
pacific is expected to fill in and peak late Thursday through
Friday before slowly easing over the upcoming weekend. Surf
heights are expected to remain below advisory levels through the
peak.

Fire weather
Gusty winds and low afternoon relative humidities will continue to
result in the possibility of rapid fire spread in areas where
fuels have dried sufficiently. Kbdi is near critical red flag
thresholds at honolulu, but remains just below levels required for
a red flag warning to be issued. However, some leeward areas
across the state may already be experiencing critically dry
conditions. The combination of dry and windy conditions in the
afternoons is expected to remain through the work week, before
winds ease and humidities rise somewhat over the weekend.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Thursday for east facing shores
of kauai, oahu, molokai, maui and big island.

Wind advisory until 6 pm hst this evening for lanai-kahoolawe-
big island north and east-kohala.

Gale warning until 6 pm hst Thursday for pailolo channel-
alenuihaha channel.

Small craft advisory until 6 pm hst Thursday for all remaining
hawaiian coastal waters.

Discussion fire weather... Foster
aviation... Jelsema
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi60 min 81°F10 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi52 min NE 14 G 21 77°F 1018.4 hPa (+0.0)
51201 - Waimea Bay, HI (106) 82 mi50 min 78°F7 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi82 min 78°F 80°F1018.7 hPa69°F

Wind History for Nawiliwili, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE18
G31
NE22
NE17
G22
NE19
G24
NE17
G21
NE18
G22
NE18
G23
NE17
G22
NE19
G25
NE16
G24
NE18
G24
NE15
G21
NE13
G23
NE18
G22
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G24
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G21
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G22
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G23
NE11
G17
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NE15
G19
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NE14
G21
1 day
ago
NE17
G24
NE20
G25
NE19
G25
NE18
G22
NE18
G24
NE17
G23
NE16
G23
NE16
G26
NE16
G21
NE16
G21
NE16
G20
NE17
G21
NE18
G22
NE16
G21
NE15
G20
NE14
G23
NE17
G22
NE14
G20
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G19
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NE12
G18
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NE13
G17
2 days
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E22
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G21
E18
G24
E21
NE18
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E18
G22
NE17
G23
NE18
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G23
E21
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NE17
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G24
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G21
NE16
G21
NE17
G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi59 minNE 2010.00 miA Few Clouds and Breezy77°F66°F71%1018.5 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi56 minN 010.00 miA Few Clouds74°F62°F67%1017.9 hPa

Wind History from HLI (wind in knots)
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Last 24hrNE25
G32
NE23
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NE21NE21
G27
NE22NE20
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NE21NE20
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NE20NE17
G32
NE21NE20NE20
G28
NE20
1 day agoNE23
G29
NE21
G29
NE21
G27
NE18NE20NE19
G26
NE22
G27
NE17
G25
NE19NE19
G24
NE21NE17
G26
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NE19NE21
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NE19NE20NE17NE14NE17
G23
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2 days agoE20
G27
E21E20
G25
E18
G25
E17
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NE17
G26
E19E21
G24
NE19
G32
NE18NE19
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G30
E21E20
G27
NE21
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G31
E20NE22NE21
G27
NE17
G24
NE19
G24
NE17
G26
NE21

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Wed -- 01:49 AM HST     1.82 feet High Tide
Wed -- 05:41 AM HST     Moonrise
Wed -- 06:35 AM HST     Sunrise
Wed -- 07:36 AM HST     0.40 feet Low Tide
Wed -- 01:39 PM HST     1.59 feet High Tide
Wed -- 05:55 PM HST     Moonset
Wed -- 06:10 PM HST     Sunset
Wed -- 07:30 PM HST     0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.81.81.71.410.60.40.40.60.81.11.41.61.61.41.10.70.30.10.10.30.61

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Wed -- 03:00 AM HST     1.72 feet High Tide
Wed -- 05:40 AM HST     Moonrise
Wed -- 06:34 AM HST     Sunrise
Wed -- 09:02 AM HST     0.40 feet Low Tide
Wed -- 02:50 PM HST     1.49 feet High Tide
Wed -- 05:54 PM HST     Moonset
Wed -- 06:09 PM HST     Sunset
Wed -- 08:56 PM HST     0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.41.61.71.61.41.10.70.50.40.50.711.21.41.51.41.10.80.40.20.10.20.5

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 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.