Wednesday, November22, 2017 L-36.com


Marine Weather and Tides
Naalehu, 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 6:32AMSunset 5:41PM Wednesday November 22, 2017 10:27 AM HST (20:27 UTC) Moonrise 10:00AMMoonset 9:25PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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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PHZ124 Big Island Southeast Waters- 1003 Am Hst Wed Nov 22 2017
.small craft advisory in effect through Friday afternoon...
Rest of today..Northeast winds 20 knots. Wind waves 5 feet. North swell 6 feet. Isolated showers through the day. Haze in the afternoon.
Tonight..Northeast winds to 25 knots. Wind waves 7 feet. North swell 8 feet increasing to 11 feet after midnight. Scattered showers.
Thursday..Northeast winds to 30 knots. Wind waves 8 feet. North swell 11 feet. Scattered showers.
Thursday night..Northeast winds to 25 knots. Wind waves 9 feet. North swell 11 feet. Scattered showers.
Friday..Northeast winds to 30 knots. Wind waves 9 feet. Northeast swell 11 feet decreasing to 9 feet in the afternoon. Scattered showers in the morning.
Friday night..Northeast winds to 30 knots. Wind waves 9 feet. Northeast swell 8 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..Northeast winds to 25 knots. Wind waves 8 to 9 feet. Northeast swell 6 to 8 feet. Scattered showers.
Sunday..East winds to 30 knots. Wind waves 9 feet. Northeast swell 7 to 9 feet. Showers likely.
PHZ100 1003 Am Hst Wed Nov 22 2017
Synopsis for hawaiian coastal waters.. Strong high pressure will build northwest of the area during the next few days, resulting in windy trades over the coastal waters beginning this afternoon and continuing into the weekend. Winds could approach gale force in some of the windier channeled areas on Thursday. A large north swell is expected to spread into the area this afternoon, peak tonight into Thursday, then slowly subside through Friday.

7 Day Forecast for Marine Location Near Naalehu, HI
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location: 19.08, -155.55     debug


Area Discussion for -
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Fxhw60 phfo 222001
afdhfo
area forecast discussion
national weather service honolulu hi
1001 am hst Wed nov 22 2017

Synopsis
Gusty trade winds are forecast today through the thanksgiving
holiday weekend. Showery conditions over windward and mountain
areas may occasionally spill into adjacent leeward sections. A
more moist trade wind pattern may set up late in the weekend and
early next week.

Discussion
A 1032 mb surface high centered far northwest of the state is
moving slowly eastward. The high is forecast to strengthen as it
drifts east, and this will tighten the pressure gradient over our
area over the next 24 hours. The result will be increasing
northeasterly trades today and tonight. Areas that are exposed to
this wind direction will see gusts approaching 30 mph this
afternoon. The pressure pattern and winds aloft for thanksgiving
day only increase the winds further, with gusts over 40 mph
possible in the windier areas of the state. Will need to consider
if winds are expected to get any stronger than this, which would
necessitate a wind advisory for these windy areas, such as leeward
kohala, lanai, central and west maui, or even elevated parts of
oahu and kauai.

Otherwise, a stable airmass remains over the state today with dry
air capping a somewhat showery mixed layer below. These showers
are affecting mainly windward areas today, and will probably see
these again tonight. Isolated shower spillover to leeward areas
of smaller islands are also anticipated due to the increasing wind
flow. This typical trade wind shower pattern is expected to
continue through much of the weekend, although models show a more
moist, 2 inch precipitable water, airmass developing over the
eastern half of the state Sunday into Monday. This appears in
response to an upper level trough which dives southward over the
state, bringing colder air aloft to the western portion of the
state and increasing the subtropical jet across the eastern half
of the state. Although highly uncertain, if the models persist in
this forecast pattern, the result will be a chance of heavier
showers, especially for windward big island Sunday into Monday.

Even less certainty on whether this moisture would interact with
instability across the smaller islands.

Aviation
High pressure northwest of the state will keep a moderate to
breezy trade wind flow in place through tonight, with the trades
strengthening to locally windy levels on thanksgiving day. Bands
of clouds and showers will move into windward areas through the
period, with showers also reaching leeward areas from time to
time. Some brief MVFR CIGS vsbys will be possible in windward
areas as showers move through, but predominantlyVFR conditions
are expected at the terminals through 23 18z.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of the mountains of all islands. The airmet is
expected to continue through thanksgiving day.

Airmet sierra may be needed for mountain obscuration later today
or tonight.

Marine
Even as local seas are slowly dropping below the 10-foot small
craft advisory (sca) criteria, the next large N swell is
approaching on its heels. Starting to see long-period forerunners
at NOAA buoy 51101. This incoming swell, combined with
strengthening trades, will make for hazardous conditions to small
craft across most of our coastal waters for the thanksgiving
holiday, and into the holiday weekend. Some of the high resolution
guidance shows winds approaching gale force in the alenuihaha
channel on thu, so will keep an eye on this. The trades may ease
off slightly on Fri but it will still be quite windy.

Although surf has probably come below advisory level temporarily
on the n- (and some e-) facing shores, surf along these shores is
expected to rise rapidly this afternoon into the evening as the
new large N swell arrives. This swell is forecast to produce
warning-level surf on n- and exposed e-facing shores, and a high
surf warning remains in effect. A marine weather statement is also
out to cover possible harbor surges for n-facing harbors. The
swell and surf will peak Wed night into thanksgiving day, then
slowly decline Thu night and Friday.

Yet another nne swell is forecast to arrive late in the weekend
and continue into early next week. Most of the swell energy is
forecast to pass E of the state, but it still appears likely to
produce advisory-level surf on n-facing and some e-facing shores.

Hfo watches warnings advisories
High surf warning until 6 am hst Friday for niihau-kauai
windward-kauai leeward-oahu north shore-oahu koolau-olomana-
molokai-maui windward west-maui leeward west-maui central valley-
windward haleakala-big island north and east.

Small craft advisory until 6 pm hst Friday 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-pailolo
channel-alenuihaha channel-big island windward waters.

Small craft advisory until 6 pm hst Friday for maalaea bay-big
island southeast waters.

Discussion... Brenchley
aviation... Jelsema
marine... R ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 52 mi39 min N 9.9 G 12 73°F 77°F1016.9 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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N17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI46 mi34 minN 1610.00 miPartly Cloudy80°F57°F45%1015.8 hPa

Wind History from HKO (wind in knots)
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Last 24hrN12NW12NW15NW15N17N15
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N14N11E5NE4CalmCalmE3E5NE4E5E4NE3E5E4NE4CalmN9N16
1 day agoNW13NW11NW10NW12N15
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N19N11N9N7N5NE5NE5E4CalmNE5NE7E4E4NE5SE3CalmNW6N13
2 days agoNW10NW10W12NW13W11NW12N9NW8NW9NW11NW7SE3SE83S6S6SE8E9E4E6E6NE4N7NW11

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
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Wed -- 06:13 AM HST     2.60 feet High Tide
Wed -- 06:33 AM HST     Sunrise
Wed -- 09:59 AM HST     Moonrise
Wed -- 01:01 PM HST     0.86 feet Low Tide
Wed -- 05:24 PM HST     1.28 feet High Tide
Wed -- 05:42 PM HST     Sunset
Wed -- 09:24 PM HST     Moonset
Wed -- 11:19 PM HST     0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.61.11.62.12.42.62.52.31.91.51.20.90.90.911.21.31.31.10.90.60.40.3

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 06:08 AM HST     2.14 feet High Tide
Wed -- 06:36 AM HST     Sunrise
Wed -- 10:02 AM HST     Moonrise
Wed -- 01:43 PM HST     0.38 feet Low Tide
Wed -- 05:43 PM HST     Sunset
Wed -- 06:21 PM HST     0.78 feet High Tide
Wed -- 09:25 PM HST     Moonset
Wed -- 11:14 PM HST     0.36 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.611.41.822.12.11.91.51.20.80.60.40.40.50.60.70.80.80.70.60.40.4

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 (15,3,4,5)
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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.