Saturday, June23, 2018 L-36.com


Marine Weather and Tides
Princeville, HI

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:50AMSunset 7:19PM Saturday June 23, 2018 1:32 PM HST (23:32 UTC) Moonrise 3:50PMMoonset 2:49AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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- 955 Am Hst Sat Jun 23 2018
Rest of today..East winds 20 knots. Wind waves 7 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 20 knots. Wind waves 7 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..Northeast winds 20 knots. Wind waves 7 feet. Scattered showers.
Monday..Northeast winds 20 knots. Wind waves 7 feet. Scattered showers.
Monday night..East winds 20 knots. Wind waves 6 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 5 to 6 feet. Scattered showers.
Wednesday..East winds 20 knots. Wind waves 6 to 7 feet. South swell 3 feet. Isolated showers.
PHZ100 955 Am Hst Sat Jun 23 2018
Synopsis for hawaiian coastal waters.. High pressure over the central pacific will build eastward through early next 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 232000
afdhfo
area forecast discussion
national weather service honolulu hi
1000 am hst Sat jun 23 2018

Synopsis
High pressure north and northeast of the islands will support breezy
trade winds for the next week. The trades will deliver passing
clouds and showers that will primarily affect windward slopes and
coasts, with a few brief showers spreading to leeward areas of the
smaller islands. Leeward slopes of the big island will see afternoon
and evening clouds that will drop a few showers before generally
clearing at night.

Discussion
A 1034 mb surface high far N of the islands will move steadily e
through Tuesday while maintaining a central pressure in the 1030's.

The high is then expected to wobble around to the distant NE of the
islands through the end of next week. The associated pressure
gradient will ensure seasonable breezy trade winds remain over the
islands for the foreseeable future, with some subtle fluctuations.

Water vapor imagery and model analyses indicate a mid- to upper-
level low centered about 500 miles NE of the big island. Upper air
soundings and latest visible satellite images indicate that this
feature is not significantly destabilizing the lower atmosphere, but
an increase in showery low clouds is noted just a little E of the
islands, and extending E of 150w. In the short term, there is a bit
of a break in the low cloud field immediately upstream of the
islands from oahu to the big island, with showery low clouds in
greater concentration near and E of kauai. This should keep kauai
somewhat showery today while the other islands see fewer showers.

Model guidance appears to have initialized well, and depicts the mid-
level low gradually weakening as it drifts W over the next 24 to 48
hours, while the upper-level low moves n. This is expected to lead
to an increase in trade wind showers later tonight and on Sunday,
and potentially again around Monday night, as the mid-level low
weakens to a trough and moves over the islands. Most of the
associated moisture will focus over windward slopes and coasts, but
the locally strong trade winds will push a few showers to leeward
areas on the smaller islands. Leeward slopes of the big island will
see the typical afternoon and evening clouds and showers that tend
to gradually clear overnight.

While the trade winds will keep the big island's volcanic emissions
away from the smaller islands, they will continue to stream over
portions of the puna and kau districts. Additionally, eddies that
develop to the lee of the big island will occasionally lead to vog
moving ashore over the kona and kohala districts.

Aviation
Breezy, occasionally strong, trade winds will persist through the
day as a ridge of high pressure remains north of the state.VFR will
predominate, with passing showers bringing brief MVFR conditions to
windward and mauka sections of the islands.

Airmet tango remains in effect for low level turbulence over and sw
of all islands.

Marine
Trades are forecast to steadily increase through the weekend and
hold in the fresh to strong category as high pressure builds north
of the state. A small craft advisory remains in effect for most
waters east of oahu through Sunday due to the breezy winds. Although
the trades may slightly back off briefly by Monday, locally strong
trades will remain likely over the typical channels around maui
county and south of the big island.

Surf along east facing shores will become rough through the weekend
as the trades increase locally and upstream across the eastern
pacific. After the trades briefly weaken around Monday, a surge
upstream and locally will likely translate to increasing surf that
may near the advisory level by midweek.

Surf along south facing shores is expected to trend back up next
week as overlapping long-period south swells fill in due to recent
activity across the southern pacific. The first swell is currently
building at the american samoa buoy within the 14-16 second bands
this morning, which should continue through the weekend as the
second source fills in. The latest wavewatch iii guidance depicts
this source peaking Monday at the samoa buoy at 7 ft 15 seconds.

Locally, surf will begin to build along south facing shores from the
first source Tuesday, then become reinforced by Thursday as the
second larger source fills in. Surf may reach the south shore
advisory level at the peak of this reinforcement by Thursday.

Looking ahead into the first week of july, the active trend could
persist along south facing shores. The latest ECMWF and GFS guidance
supports a gale-force low passing just south of the tasman sea and
new zealand today through Monday with gales setting up within
hawaii's swell window.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Sunday for oahu leeward waters-
kaiwi channel-maui county windward waters-maui county leeward waters-
maalaea bay-pailolo channel-alenuihaha channel-big island leeward
waters-big island southeast waters.

Synopsis discussion... Birchard
aviation... Ts
marine... Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 20 mi51 min NE 16 G 20 79°F 82°F1018.2 hPa
51WH0 - WHOTS - Woods Hole Ocean Time-series 91 mi63 min 79°F

Wind History for Nawiliwili, HI
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NE14
G19
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NE12
G18
NE12
G17
NE8
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G21
NE14
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G20
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NE7
G13
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G14
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G12
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G16
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G13
NE5
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E19
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G12
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G14
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G16
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E14
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NE9
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G10
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G11
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G9
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G11
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NE8
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G14
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E11
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NE8
G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi40 minNE 1610.00 miPartly Cloudy85°F72°F65%1018.2 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi37 minN 1210.00 miPartly Cloudy84°F68°F59%1017.2 hPa

Wind History from HLI (wind in knots)
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Last 24hrNE14NE13NE14E14
G22
NE13NE12E14NE14NE10NE13E17
G23
E15NE14NE15E18
G22
NE16NE16NE13NE15NE17NE16NE16NE14NE16
1 day agoNE9NE11NE11NE11NE11NE10NE13NE13NE12NE12NE11NE11E17NE7NE13NE13NE13NE11NE9E13NE14
G20
NE15NE13NE13
2 days agoNE9NE9NE9NE7NE8E9E7E8NE7NE7------------E10E9E8E11E11E10E9E10

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Sat -- 02:49 AM HST     Moonset
Sat -- 04:48 AM HST     -0.16 feet Low Tide
Sat -- 05:55 AM HST     Sunrise
Sat -- 12:30 PM HST     1.81 feet High Tide
Sat -- 03:50 PM HST     Moonrise
Sat -- 06:55 PM HST     0.48 feet Low Tide
Sat -- 07:25 PM HST     Sunset
Sat -- 11:33 PM HST     0.84 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.70.40.1-0.1-0.2-0.10.20.611.31.61.81.81.61.310.70.50.50.50.60.70.8

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Sat -- 02:49 AM HST     Moonset
Sat -- 05:55 AM HST     Sunrise
Sat -- 06:14 AM HST     -0.16 feet Low Tide
Sat -- 01:41 PM HST     1.71 feet High Tide
Sat -- 03:49 PM HST     Moonrise
Sat -- 07:23 PM HST     Sunset
Sat -- 08:21 PM HST     0.48 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.80.70.40.2-0-0.2-0.10.10.40.81.21.51.71.71.61.31.10.80.60.50.50.60.7

Weather Map and Satellite Images
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wmap_P
GOES Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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Ground Weather Radar Station Kauai, HI
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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.