Sunday, August20, 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 6:11AMSunset 6:59PM Saturday August 19, 2017 6:17 PM HST (04:17 UTC) Moonrise 4:12AMMoonset 5:43PM Illumination 5% 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- 304 Pm Hst Sat Aug 19 2017
Tonight..East winds 15 knots. Wind waves 4 feet. Scattered showers in the evening, then showers likely after midnight.
Sunday..East winds 15 knots. Wind waves 4 feet. Showers likely in the morning, then scattered showers in the afternoon.
Sunday night..East winds 15 knots. Wind waves 4 feet. Scattered heavy showers in the evening. Slight chance of Thunderstorms through the night. Heavy showers likely after midnight.
Monday..East winds 15 knots. Wind waves 4 feet. Heavy showers likely and slight chance of Thunderstorms.
Monday night..East winds 15 knots. Wind waves 4 feet. Heavy showers likely and slight chance of Thunderstorms.
Tuesday..East winds 15 knots. Wind waves 5 feet. Showers likely and slight chance of Thunderstorms in the morning, then scattered showers in the afternoon.
Tuesday night..East winds 20 knots. Wind waves 7 feet. Scattered showers in the evening, then showers likely after midnight.
Wednesday..East winds 15 knots. Wind waves 7 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 to 7 feet. Scattered showers.
PHZ100 304 Pm Hst Sat Aug 19 2017
Synopsis for hawaiian coastal waters.. A surface high will remain far northeast of the area and weaken through Tuesday. A new surface high will build far north of the area on Monday. A low aloft will pass north of the area 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 200143
afdhfo
area forecast discussion
national weather service honolulu hi
343 pm hst Sat aug 19 2017

Synopsis
Light to moderate trade winds will prevail through early next
week as a ridge of high pressure north of the state remains weak.

The lighter winds will allow local sea breezes to be more
prominent across leeward areas, with an increase in clouds and
showers each afternoon and evening. Meanwhile, low clouds carried
by the trades will still continue to affect windward and mauka
areas at times. Tropical moisture from the east will bring an
increase in shower coverage and muggy conditions beginning
tonight and continuing through Tuesday. Expect drier and windier
conditions to return Wednesday through late next week as high
pressure strengthens north of the island chain.

Discussion
Currently at the surface, a 1029 mb high is centered around 1900
miles northeast of honolulu, with a ridge axis extending southwest
from the high to a location around 800 miles north of kauai. The
resulting gradient is driving light to moderate trade winds across
the island chain this afternoon. Visible satellite imagery shows
partly to mostly cloudy skies across the state. Radar imagery
shows scattered trade wind showers moving into windward areas,
with a few showers also affecting leeward locales. Main short
term concern revolves around rain chances over the next few days.

Tonight through Tuesday night,
light to moderate trade winds will continue through early next
week, with some slight strengthening of the trades expected late
Tuesday and Tuesday night as high pressure strengthens to the
north of the state. Aloft, an upper level low will drift
southwestward and closer to the islands tonight through Sunday
night, then pivot off to the west and further away from the state
early next week. This will act to de-stabilize the airmass over
the islands a bit, particularly over the western end of the state.

At the same time, some deeper moisture will begin to work its way
into the area from the east tonight, with precipitable water
values climbing into the 1.5 to 2.0 inch range Sunday through
Tuesday night.

As for sensible weather details, we should begin to see an
increase in trade wind showers beginning tonight, with periods of
showery weather expected Sunday through early next week,
particularly in windward areas. In leeward areas, we should also
see an increase in showers, with some localized downpours possible
each afternoon into the early evening in association with sea
breeze enhancement. Additionally, due to the more unstable airmass
over the islands, isolated thunderstorms will be possible over
the big island, primarily the interior and leeward sections, each
afternoon into the early evening. Isolated thunderstorms may also
affect the waters north of oahu and around and including the
island of kauai Sunday night through Monday evening as the upper
level low makes its closest approach. Thunderstorms may also
affect interior and leeward sections of oahu Monday afternoon,
particularly near the waianae mountains, so have included a
slight chance of thunderstorms in the forecast here as well.

Conditions will also become quite humid Sunday through early next
week, as the trades lighten up and dewpoints climb into the lower
and middle 70s across the area.

Wednesday through next Saturday,
high pressure will strengthen north of the state, bringing
moderate to breezy trade winds back to the island chain through
the end of the work week. Drier more stable conditions are also
expected, with more comfortable trade wind weather expected.

Showers will continue to favor windward and mauka areas, with a
stray shower reaching leeward areas from time to time due to the
strength of the trades.

Aviation
Vfr conditions prevail at all TAF sites with brief MVFR conditions
being reported at phto and phny. Occasional MVFR conditions are
likely occurring over windward slopes for most of the state as
moisture riding in on the trades interacts with island terrain.

No airmets are currently in effect but one may be needed later
tonight for mountain obscuration over eastern portions of the
state as an area of enhanced moisture moves in from the east.

Marine
Winds and seas are expected to remain below small craft advisory
levels through early next week as a trough aloft helps weaken the
pressure gradient. The trough may make showers more active, and
could even produce some thunderstorms Sunday night through Monday
night. Wind speeds will increase again later next week.

Surf along all shores is expected to remain well below the high
surf advisory threshold through the middle of next week.

The peak high tides for the month will occur over the next few days.

Water levels are running as much as a foot above the predicted
levels due to an eddy moving westward through hawaiian waters.

Coastal flooding is possible around the times of the high tides
through early next week. See the special weather statement for
more details.

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Burke
marine... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi55 min 81°F4 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi47 min NE 11 G 15 81°F 1013.7 hPa
51201 - Waimea Bay, HI (106) 82 mi45 min 79°F3 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi107 min 80°F 81°F1013.8 hPa72°F

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi24 minENE 1210.00 miMostly Cloudy82°F71°F69%1013.9 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi21 minW 810.00 miFair84°F72°F67%1013 hPa

Wind History from HLI (wind in knots)
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Last 24hrNE13NE13NE14NE12NE12NE11NE11NE9NE10NE9NE10NE11NE11NE11NE10NE12NE11NE11NE10NE11NE10NE12NE12NE12
1 day agoNE11NE15NE14NE14NE9NE12E13NE11NE11NE10NE9NE10NE11NE10NE12NE11NE11NE12NE13NE14NE14NE13NE13NE14
2 days agoNE9NE11NE12NE12NE11NE12NE8NE13NE14NE11NE12NE11NE11NE12NE11NE10NE11NE11NE10NE11NE10NE13NE12NE11

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Sun -- 01:29 AM HST     1.12 feet High Tide
Sun -- 05:15 AM HST     Moonrise
Sun -- 06:17 AM HST     Sunrise
Sun -- 06:42 AM HST     0.02 feet Low Tide
Sun -- 02:04 PM HST     2.43 feet High Tide
Sun -- 06:34 PM HST     Moonset
Sun -- 07:05 PM HST     Sunset
Sun -- 08:36 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.11.10.90.60.30.100.20.511.522.32.42.321.40.90.50.20.20.30.6

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Sun -- 02:40 AM HST     1.02 feet High Tide
Sun -- 05:14 AM HST     Moonrise
Sun -- 06:16 AM HST     Sunrise
Sun -- 08:08 AM HST     0.02 feet Low Tide
Sun -- 03:15 PM HST     2.33 feet High Tide
Sun -- 06:33 PM HST     Moonset
Sun -- 07:04 PM HST     Sunset
Sun -- 10:02 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.8110.90.70.40.100.10.40.81.31.82.12.32.321.510.60.30.20.3

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 (0,6,7,8)
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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.