Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Honaunau-Napoopoo, 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 6:15AMSunset 5:55PM Tuesday October 17, 2017 1:22 AM HST (11:22 UTC) Moonrise 4:32AMMoonset 5:01PM Illumination 9% 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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PHZ123 Big Island Leeward Waters- 915 Pm Hst Mon Oct 16 2017
.small craft advisory in effect through early Thursday morning...
Rest of tonight..West of the big island, southeast winds 10 knots late in the evening becoming variable less than 10 knots. NEar south point, east winds to 30 knots. Wind waves 12 feet. SWell south 4 to 5 feet. Haze through the night. Isolated showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. SWell south 3 to 4 feet. Isolated showers in the morning. Haze through the day.
Tuesday night..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. SWell south 3 to 4 feet. Haze through the night. Isolated showers through the night.
Wednesday..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. Isolated showers in the morning. Haze through the day.
Wednesday night..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. Haze through the night. Isolated showers through the night.
Thursday..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. Isolated showers in the morning. Haze through the day.
Thursday night..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 12 feet. Haze through the night. Isolated showers through the night.
Friday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 10 to 12 feet. Northwest swell 3 feet. Haze. Isolated showers.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 feet. Haze. Isolated showers.
PHZ100 915 Pm Hst Mon Oct 16 2017
Synopsis for hawaiian coastal waters.. Strong surface high pressure will persist far north of the islands through Thursday. The trades will begin to ease starting Friday as the high pressure weakens and begins to move eastward.

7 Day Forecast for Marine Location Near Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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Fxhw60 phfo 170651
afdhfo
area forecast discussion
national weather service honolulu hi
851 pm hst Mon oct 16 2017

Synopsis
High pressure north of hawaii will keep a windy trade wind
pattern in place through much 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
Currently at the surface, a 1030 mb high centered 950 miles north
of honolulu, is driving windy trades across the island chain this
evening. Infrared satellite imagery shows partly to mostly cloudy
skies in place across the state, with cloud cover most prevalent
over windward areas. Meanwhile, radar imagery shows scattered to
numerous showers moving into windward areas, with showers
occasionally reaching leeward areas as well. Main short term
concern over the next few days revolves around the strong trades.

High pressure will remain anchored to the north of the state through
mid-week, with another re-enforcing high building north of the
islands on Wednesday. This high will then remain nearly
stationary through Thursday, before shifting eastward and
weakening Friday and over the weekend as a cold front approaches
from the northwest. As a result, windy conditions are expected to
continue across the entire state through Thursday night, with the
trades easing a bit on Friday, and trending down further over the
weekend.

Winds have dropped below advisory levels for much of the state
this evening, so will cancel the wind advisory for most areas with
the evening update. For the typically windy areas such as lanai,
kahoolawe, as well as over and downwind of the kohala mountains on
the big island, we will extend the wind advisory through Tuesday
evening. A wind advisory may also be needed for the central valley
of maui Tuesday afternoon, but will re-evaluate this for the
morning forecast package. With the windy conditions persisting
through much of the work week, the wind advisory may need to be
extended and possibly expanded to cover other portions of the
state right through Thursday night.

As for sensible weather details, clouds and showers will favor
windward and mauka areas through the forecast period, with showers
also reaching leeward areas from time to time due to the strength of
the trades. Model solutions are indicating an increasing probability
that deep tropical moisture will get drawn northward into or near
the islands Sunday through early next week. As a result, will trend
toward a wetter forecast and continue to monitor model trends and
make adjustments as details become more clear.

Aviation
A strong high pressure center north of the hawaiian
islands will produce windy northeasterly trade winds through
Wednesday. Enough instability in the low levels will produce
scattered shower activity with brief periods of MVFR conditions
mainly over mountains and northeastern slopes of all islands.

OtherwiseVFR conditions will prevail.

Airmet tango for low level mechanical turbulence remains in
effect over and south through west of all mountain areas due to
windy conditions.

Marine
Very strong and gusty trade winds will continue through mid-week
due to a strong surface high far north of the main hawaiian
islands. This high will be replaced by another strong high on
Wednesday, which will continue the gusty trades for an additional
day or two. The strong to gale-force trade winds are also
producing very rough and elevated seas around the islands. Gale
warnings are posted for the pailolo and alenuihaha channels
through Thursday afternoon, while a small craft advisory remains
in effect for the remaining hawaiian waters through the same time.

Trade winds speeds are expected to diminish slightly starting
Friday as the high starts to weaken and begins to move toward the
east.

Elevated, rough waves continue to produce dangerous conditions in
surf zones along most east facing shores. Therefore, a high surf
advisory remains in effect for these beaches through Wednesday
afternoon. Since the trade winds will likely continue to be
strong, this advisory will likely be extended from Wednesday
night through Thursday.

A long-period south swell is forecast to peak some time later
tonight or early Tuesday morning with a swell height of around 4
feet and a wave period near 17 seconds. A high surf advisory for
the south facing shores of all islands remains in effect through
Tuesday afternoon. This south swell will slowly diminish from
Tuesday night through Wednesday. Small southwest and south-
southwest swells arriving this weekend will produce small
background surf along south facing shores.

The current north-northwest swell is expected to gradually
subside through Wednesday. A long-period north-northwest swell
arriving Thursday is expected to peak Friday. This swell will
likely produce moderate-sized surf (below the high surf advisory
threshold) along most north facing shores, as well as along some
west facing shores of the smaller islands. A somewhat larger
northwest swell is due in Sunday night and Monday of next week,
with the surf potentially approaching high surf advisory levels
along the north and some west facing shores of the smaller
islands.

See the oahu surf discussion (srdhfo), which was updated earlier
this afternoon, for more detailed information regarding the swell
sources.

Fire weather
Strong trade winds coupled with a drier airmass pushing over the
state will allow minimum relative humidity to drop into the 40 to
45 percent range during the afternoon hours over the next few
days. These conditions will result in an increased potential for
fires to ignite and spread quickly. The windy and relatively dry
conditions will continue through the end of the work week before
the trade winds weaken. The keetch-byram drought index, or kbdi,
is at 572 today (and would need to be at 600 for red flag warning
criteria). Keep in mind that we will be close to these conditions
each afternoon.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Tuesday for niihau-kauai
leeward-oahu south shore-waianae coast-molokai leeward-lanai
makai-kahoolawe-maui leeward west-maui central valley-leeward
haleakala-kona-kohala.

High surf advisory until 6 pm hst Wednesday for kauai windward-
oahu koolau-olomana-molokai windward-maui windward west-windward
haleakala-south big island-big island north and east.

Wind advisory until 10 pm hst Tuesday for lanai-kahoolawe-big
island north and east-kohala.

Small craft advisory until 6 am hst Thursday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-oahu leeward waters-kaiwi channel-maui
county windward waters-maui county leeward waters-maalaea bay-
big island windward waters-big island leeward waters-big island
southeast waters.

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

Discussion fire weather... Jelsema
aviation... Bohlin
marine... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 37 mi53 min ESE 13 G 23 81°F 80°F1014.7 hPa
51206 45 mi56 min 80°F9 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi30 minNE 910.00 miMostly Cloudy77°F60°F56%1014.8 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi27 minN 010.00 miFair46°F36°F70%1015.5 hPa

Wind History from HKO (wind in knots)
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Last 24hrE7CalmE5NE5E5NE9E5S4SW7SW7S10SW9S10S12S12SE10SE9SE9NE6NE6CalmN10NE4NE9
1 day agoE8E6SE5E6CalmNE3S4SW6NW6SW6S9S9S11S10SW10S9SE11SE9SE8NE6NE6NE8NE5SE11
G18
2 days agoE5E4E6SE4E3NE3CalmSW4SW6S9S12S10SW9S9SW10S7S9S7SE5SE7E4SE7SE7SE12

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 02:17 AM HST     1.73 feet High Tide
Tue -- 04:33 AM HST     Moonrise
Tue -- 06:19 AM HST     Sunrise
Tue -- 08:13 AM HST     0.38 feet Low Tide
Tue -- 02:12 PM HST     1.83 feet High Tide
Tue -- 05:02 PM HST     Moonset
Tue -- 05:58 PM HST     Sunset
Tue -- 08:34 PM HST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.61.71.71.51.10.80.50.40.40.711.41.71.81.81.51.10.70.40.10.10.30.7

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 02:20 AM HST     1.77 feet High Tide
Tue -- 04:33 AM HST     Moonrise
Tue -- 06:19 AM HST     Sunrise
Tue -- 08:14 AM HST     0.24 feet Low Tide
Tue -- 02:20 PM HST     1.94 feet High Tide
Tue -- 05:02 PM HST     Moonset
Tue -- 05:58 PM HST     Sunset
Tue -- 08:38 PM HST     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.61.81.71.51.10.70.40.30.30.611.41.71.91.91.61.20.70.30.100.20.6

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 (7,2,3,4)
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Ground Weather Radar Station South Shore, 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.