Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Nanawale 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 6:14AMSunset 6:35PM Wednesday March 29, 2017 4:33 PM HST (02:33 UTC) Moonrise 7:42AMMoonset 8:34PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 329 Pm Hst Wed Mar 29 2017
Tonight..East winds 20 kt. Wind waves 7 ft. Northwest swell 6 ft. Scattered showers.
Thursday..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Scattered showers in the morning...then isolated showers in the afternoon.
Thursday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Isolated showers.
Friday..East winds 20 kt. Wind waves 6 ft. Northwest swell 8 ft increasing to 10 ft in the afternoon. Scattered showers in the morning...then isolated showers in the afternoon.
Friday night..East winds 15 kt. Wind waves 6 ft. Northwest swell 11 ft. Isolated showers in the evening...then scattered showers after midnight.
Saturday..East winds 20 kt. Wind waves 7 ft. Northwest swell 10 ft. Scattered showers in the morning...then isolated showers in the afternoon.
Saturday night..East winds 20 kt. Wind waves 7 ft. Northwest swell 8 ft. Scattered showers.
Sunday..East winds 20 kt. Wind waves 7 ft. Northwest swell 5 to 7 ft. Isolated showers.
Monday..East winds 20 kt. Wind waves 7 ft. Northwest swell 4 to 5 ft. Isolated showers.
PHZ100 329 Pm Hst Wed Mar 29 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will weaken as a cold front approaches and stalls northwest of the area Thursday through Friday. High pressure will build north of the state over the weekend behind this front.

7 Day Forecast for Marine Location Near Nanawale Estates, HI
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location: 19.49, -154.81     debug


Area Discussion for -
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Fxhw60 phfo 292018
afdhfo
area forecast discussion
national weather service honolulu hi
1018 am hst Wed mar 29 2017

Synopsis
Light east winds over the western end of the state will allow for
leeward sea breezes over kauai and oahu through Thursday with
increasing afternoon showers. Moderate trade winds will continue
over the rest of the state with passing windward showers. Trade
winds will become breezy over the weekend with increasing showers
expected.

Discussion
High pressure located in the east pacific is maintaining moderate
trade winds over the eastern half of the state with light east
southeast flow over the western islands. The lighter winds will
allow for afternoon leeward sea breezes over kauai and oahu with
increasing afternoon clouds and showers over the interior island
areas. Passing windward showers will continue over maui county and
the big island. This pattern will continue through Thursday
before high pressure gradually builds north of the state Friday.

Trade winds will increase in response, with breezy to windy
conditions expected over the weekend and into next week. Showers
will also increase with a focus over windward and mountain areas,
with spotty showers over leeward locations. Weaker trade wind
flow is expected by midweek as high pressure weakens.

Aviation
Moderate trade winds are expected for the next several days. Wind
speeds should stay below the threshold for any widespread low
level turbulence. Morning soundings show the inversion sloping
from near 9 kft at phto to near 6 kft at phli. Amdar data into and
out of hnl place the inversion near 6.5 kft.

Low clouds and showers will continue to favor windward and
mountain areas, periods of MVFR cigs/vis can not be ruled out.

However, airmet sierra for mountain obscuration is not expected at
this time. Elsewhere, expect predominatelyVFR.

Marine
The latest surface analysis showed a 974 mb storm-force low
centered around 1500 nm northwest of kauai near the date line with
a large area of west-northwest storm-force winds (focused within
the 290 to 310 directional band relative to the islands) just to
its south. According to the latest altimeter passes, seas
associated with this system continue to range from 30 to 36 ft
over the heart of the fetch region focused toward the islands,
which has been persistent for the past several passes. This low is
forecast to track east-northeast across the north pacific through
the week.

A large west-northwest swell (290-310 deg) associated with this
system should reach the islands Thursday night, peak Friday and
Friday night, then slowly ease over the weekend. Warning-level
surf for exposed north and west facing beaches and advisory-level
seas are expected during this time. All of the models remain in
close agreement for seas to ramp up quickly Thursday night to small
craft advisory levels and peak in the 10 to 14 ft range Friday,
before slowly easing through the weekend. If the swell comes in
larger or later than predicted, warning-level surf could continue
into Saturday before dropping to advisory levels Sunday. Prior to
the arrival of this large swell, however, surf along north and west
facing shores will hold below advisory level through Thursday due
to a lingering northwest swell from earlier this week.

Local winds and seas will likely remain below advisory levels
through Friday as the ridge of high pressure north of the state
slightly weakens in response to a cold front that is forecast to
approach the region later in the week. Advisory-level trade winds
will return across portions of the waters over the weekend as high
pressure builds north of the state behind this front.

Surf along east facing shores will remain small and choppy through
the week due to moderate to fresh onshore winds. Surf will begin
to build over the weekend as easterly winds strengthen locally
and upstream of the islands, and may near or reach advisory levels
along east facing shores by the end of the weekend and into early
next week.

A slight increase in surf along south facing shores is possible
Thursday through Saturday due to a long-period swell (190 deg)
from recent activity across the southern pacific. In addition to
this southerly swell, wrap from the previously discussed large
west-northwest swell will add to the mix by Friday at select spots
along exposed southern facing beaches.

Hfo watches/warnings/advisories
None.

Morrison... Discussion
eaton... Aviation
ts... Marine


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi45 min SE 6 G 9.9 1017.6 hPa
51206 22 mi51 min 78°F7 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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E11
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G14

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI21 mi40 minESE 910.00 miMostly Cloudy81°F66°F61%1017.8 hPa

Wind History from HTO (wind in knots)
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Last 24hrE9E5CalmSW3SW4W3SW4SW43W5SW6W94SW5SW4CalmCalmSW6SW75E9E8E11SE9
1 day agoSE7E7E5S3SW4W4SW4SW5SW8SW8SW7W9SW3SE6SW5W4W8E5E11
G14
53E9E11E11
2 days agoE9E7S3S3SW3W5SW7SW4SW5SW8SW4SW5SW7SW6S5SW6SW5S4SE7E11
G16
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Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Wed -- 03:53 AM HST     2.15 feet High Tide
Wed -- 06:16 AM HST     Sunrise
Wed -- 07:42 AM HST     Moonrise
Wed -- 10:08 AM HST     -0.40 feet Low Tide
Wed -- 04:37 PM HST     2.41 feet High Tide
Wed -- 06:33 PM HST     Sunset
Wed -- 08:35 PM HST     Moonset
Wed -- 10:46 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.51.11.622.121.50.90.3-0.2-0.4-0.30.10.81.422.32.42.11.61.10.50.20.1

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Wed -- 04:31 AM HST     2.17 feet High Tide
Wed -- 06:18 AM HST     Sunrise
Wed -- 07:45 AM HST     Moonrise
Wed -- 10:41 AM HST     -0.40 feet Low Tide
Wed -- 05:15 PM HST     2.43 feet High Tide
Wed -- 06:35 PM HST     Sunset
Wed -- 08:37 PM HST     Moonset
Wed -- 11:19 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.81.31.82.12.11.81.30.60.1-0.3-0.4-0.10.411.72.22.42.321.40.80.40.1

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 (22,6,7,8)
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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.