Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Leilani Estates, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:17AMSunset 6:34PM Saturday March 25, 2017 11:17 PM HST (09:17 UTC) Moonrise 4:40AMMoonset 4:36PM Illumination 2% 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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PHZ122 Big Island Windward Waters- 917 Pm Hst Sat Mar 25 2017
.small craft advisory in effect through early Monday morning...
Today..East winds 20 kt. Wind waves 6 ft in the afternoon. Northwest swell 6 ft in the afternoon. Isolated showers in the morning.
Tonight..East winds to 25 kt. Wind waves 6 ft. Northwest swell 7 ft increasing to 9 ft after midnight. Isolated showers after midnight.
Sunday..East winds to 25 kt. Wind waves 7 ft. Northwest swell 10 ft. Isolated showers.
Sunday night..East winds to 25 kt. Wind waves 7 ft. Northwest swell 10 ft. Scattered showers.
Monday..East winds 20 kt. Wind waves 6 ft. Northwest swell 8 ft. Scattered showers.
Monday night..East winds 20 kt. Wind waves 5 ft. Northwest swell 7 ft. Scattered showers.
Tuesday..East winds 20 kt. Wind waves 5 ft. Northwest swell 7 ft. Scattered showers.
Wednesday..East winds 20 kt. Wind waves 5 to 6 ft. Northwest swell 6 to 7 ft. Scattered showers.
PHZ100 917 Pm Hst Sat Mar 25 2017
Synopsis for hawaiian coastal waters.. High pressure north of the islands will shift east into the early portion of the week as a cold front passes far north of the state.

7 Day Forecast for Marine Location Near Leilani Estates, HI
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location: 19.4, -154.93     debug


Area Discussion for -
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Fxhw60 phfo 260656
afdhfo
area forecast discussion
national weather service honolulu hi
856 pm hst Sat mar 25 2017

Synopsis
A surface high to the north will move east through Monday, then
become nearly stationary far northeast of the islands. A ridge aloft
will remain over the islands through the middle of next week. By the
end of the week, a trough aloft and a front will approach from the
northwest.

Discussion
A 1026 mb high about 850 miles north of honolulu near 34n 157w is
forecast to move east through the weekend, then become nearly
stationary early next week about 1500 miles northeast of honolulu
near 35n 135w. A surface ridge extending west from the high will
remain north of the islands through the coming week. The high will
keep breezy trade winds blowing over the islands through the
weekend. A ridge aloft will remain over the main hawaiian islands
through the weekend keeping the weather quite dry.

A trough aloft will move eastward to the north of the islands on
Monday. The surface high moving away to the east and the trough
aloft passing by will combine to weaken the trade winds Sunday night
through Monday. The trade winds will strengthen again on Tuesday,
but the trades won't get as breezy as they will be over the weekend.

The atmosphere will remain dry and stable through the middle of next
week, so rainfall will remain light.

Toward the end of next week a deep trough aloft and an associated
front will approach from the northwest. The surface ridge will shift
south closer to the islands and the atmosphere will become more
moist and less stable. Showers will likely become more active late
in the week.

Aviation
Locally strong NE to E winds and a strong and low temperature
inversion will produce conditions favorable for low level
turbulence. Airmet tango will remain up through at least Sunday for
ocnl mod turb southwest of the mountains of all island. Clouds and
showers will remain sparse, soVFR ceilings and visibilities will
prevail.

Marine
Hazardous boating and beach conditions will continue into Monday
before trending down into mid week due to a combination of fresh to
strong trade winds and a large west-northwest (wnw; 310 deg) swell
that is currently building down the island chain this evening.

These conditions have led to a small craft advisory for all hawaiian
waters due to winds (25 to 30 kts, strongest in the channels) and/or
seas (10 ft or greater) through Sunday night. The large wnw swell
will generate life-threatening surf along exposed north and west
facing shores into Monday before slowly trending down into mid week.

A high surf warning remains in effect for niihau, kauai and the west
facing shores of the big island through Sunday night. A high surf
advisory remains in effect for exposed coasts on oahu and the maui
county islands through Sunday night. If heights climb above
predicted levels overnight, north facing shores of oahu will need to
be included in the warning later tonight. Advisory-level surf will
likely continue through the day Monday along exposed north and west
facing shores before dipping below criteria.

For the building wnw swell, the latest pacioos nearshore buoy
observations are remaining in line with the latest wave model
guidance and are depicting swell heights ranging from seven to eight
feet at the hanalei and waimea buoys and down into the two to four
foot range at the pauwela buoy. There was one random spike recorded
at the waimea buoy up to 10 ft around 4 pm hst this afternoon, which
is the highest recorded thus far. The offshore buoys northwest of
kauai are currently recording swell heights between 12 and 14 ft,
which is the predicted peak of this swell event.

Surf along east facing shores will remain small and choppy through
the upcoming week due to moderate to strong onshore winds
persisting.

Surf along south facing shores could see a slight increase late
tonight through Sunday due to the previously discussed wnw swell
wrapping around the islands. A slight increase in surf along south
facing shores will also become a possibility Thursday through
Saturday due to a long-period swell (190 deg) associated with recent
activity across the southern pacific.

For the outlook, another large long-period wnw (310 deg) swell will
be possible across the islands Thursday night through the weekend.

The latest deterministic and ensemble guidance remain in decent
agreement over the next few days and depict a storm-force low
developing off the coast of japan Sunday night into Monday, then
tracking ene to the date line Tuesday night into Wednesday while
intensifying (around 970 mb low). A large batch of gale-to-storm
force westerly winds focused toward the region through this time is
forecast with seas peaking within the 30 to 40 ft range.

Swell across the islands associated with this storm will likely lead
to another period of warning-level surf and advisory-level seas.

More details will follow in later packages this week as this system
evolves and confidence increases with regard to specifics on arrival
times and impacts.

Hfo watches/warnings/advisories
High surf warning until 600 am Monday for north and west facing
shores of niihau and kauai and west facing shores of the big island.

High surf advisory until 600 am Monday for north and west facing
shores of oahu and molokai and north facing shores of maui.

Small craft advisory through 600 am Monday for all hawaiian waters.

Marine... Gibbs
remainder... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 24 mi47 min SSW 2.9 G 4.1 71°F 76°F1023.6 hPa
51206 26 mi65 min 78°F7 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI23 mi24 minSW 610.00 miMostly Cloudy69°F61°F76%1023.7 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW7SW7SW7SW7SW7SW7SW7SW5SW4N5NE7E8E11E13E14E8E10E5SE4S3S3W7SW5SW5
1 day agoW4W64SW4SW5SW4CalmSW3SE4E11E13E12
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2 days agoSW5SE5SW4CalmSW4SW3SW5SW6W3SE4E8E9E12E10SE12E11SE12SE6SE6SE9CalmS3CalmSW4

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
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Sun -- 02:13 AM HST     2.42 feet High Tide
Sun -- 05:25 AM HST     Moonrise
Sun -- 06:18 AM HST     Sunrise
Sun -- 08:33 AM HST     -0.09 feet Low Tide
Sun -- 02:28 PM HST     1.99 feet High Tide
Sun -- 05:34 PM HST     Moonset
Sun -- 06:32 PM HST     Sunset
Sun -- 08:28 PM HST     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.72.22.42.321.40.80.3-0-0.10.20.71.21.7221.71.20.60.1-0.2-0.20.10.7

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Sun -- 02:51 AM HST     2.45 feet High Tide
Sun -- 05:27 AM HST     Moonrise
Sun -- 06:20 AM HST     Sunrise
Sun -- 09:06 AM HST     -0.09 feet Low Tide
Sun -- 03:06 PM HST     2.01 feet High Tide
Sun -- 05:36 PM HST     Moonset
Sun -- 06:34 PM HST     Sunset
Sun -- 09:01 PM HST     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.92.32.42.21.81.20.60.1-0.100.40.91.41.821.91.510.4-0-0.2-0.10.4

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 (5,6,7,8)
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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.