Friday, January18, 2019 L-36.com


Marine Weather and Tides
Honomu, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:56AMSunset 6:05PM Friday January 18, 2019 12:29 PM HST (22:29 UTC) Moonrise 3:51PMMoonset 4:25AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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- 930 Am Hst Fri Jan 18 2019
Rest of today..North winds 15 knots. Wind waves 4 feet. Northwest swell 8 feet. Scattered showers.
Tonight..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 8 feet. Scattered showers in the evening, then isolated showers after midnight.
Saturday..East winds 15 knots. Wind waves 4 feet. North swell 7 feet. Isolated showers in the morning.
Saturday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 6 feet. Scattered showers after midnight.
Sunday..Southeast winds 20 knots. Wind waves 6 feet. North swell 5 feet. Scattered showers in the morning.
Sunday night..Southeast winds 15 knots. Wind waves 5 feet. North swell 4 feet. Scattered showers after midnight.
Monday..Southeast winds 15 knots. Wind waves 4 to 5 feet. Northwest swell 4 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 5 feet. Northwest swell 6 to 8 feet. Scattered showers.
PHZ100 930 Am Hst Fri Jan 18 2019
Synopsis for hawaiian coastal waters.. A front near the alenuihaha channel will stall and weaken today. A high far northwest of the area will move east at 20 kt through Sunday, then move away to the northeast. A new front will approach from the northwest early next week, then stall northwest of kauai on Tuesday.


7 Day Forecast for Marine Location Near Honomu, HI
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location: 20.04, -155     debug


Area Discussion for -
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Fxhw60 phfo 182019
afdhfo
area forecast discussion
national weather service honolulu hi
1019 am hst Fri jan 18 2019

Synopsis
A cold front will stall and dissipate over the islands today
through Saturday. Trades will return for a brief period beginning
tonight, then quickly shift toward the south and weaken Sunday
through Monday. Winds will remain light through much of the
upcoming week as a surface ridge shifts southward over the
islands.

Discussion
A dissiptating cold front lies over maui county this morning. The
front is becoming rather diffuse, with a band of broken clouds and
showers-some heavy with even a thunderstorm over the coastal
waters-near oahu and maui county. A high pressure area several
hundred miles to the wnw of the islands is moving quickly toward
the e, and is expected to push what remains of this boundary
farther S as it continues to dissipate. This should continue to
bring an increase in clouds along with higher rain chances to the
area from oahu to maui county the remainder of today and into
tonight. Raised pops and sky cover around the central islands for
today with this boundary lingering.

Winds at summit levels have been just below advisory level,
accelerated ahead of an approaching mid-level trough coming our
way. Models show the winds should be decreasing there as the
trough axis arrives and moves through tonight. Could still see
sustained winds or gusts reaching advisory levels today so will
maintain the wind advisory as is for the highest elevations. These
areas could also see some snow showers this afternoon if any deep
convection can get going over the slopes of mauna loa or mauna kea
this afternoon.

High resolution guidance suggests that the spatial pattern of the
rainfall will shift more toward a trade wind type distribution
tonight, focusing on maui county and the northern portion of the
big island, with oahu near the northern edge of the remnant
moisture band. This should occur as the small surface high passes
n of the islands tonight and reinforces the trades. Wind speeds
should be gentle to locally breezy overnight into Sat morning.

The high continues E over the weekend, and will be far enough ne
of the islands to veer our local winds back to ese. This will
return light winds to the area as the surface ridge builds back
over us once again, through at least the middle of next week.

There's good agreement that the trailing end of a front will
approach the NW coastal waters Monday or Monday night, but for now
it looks like this feature will have little affect on our
weather. Will keep an eye on this for any changes. Clouds and
showers will refocus over the interiors each afternoon and
evening. Moisture looks to be rather limited by sun, and mid-
level ridging strengthens some over the weekend, which should
limit shower activity a bit. It's possible a convective pattern of
afternoon clouds and showers over island interiors could get a
bit more active starting on Monday as themodels show cooler mid-
level air oozing S over the islands early next week.

Aviation
A weakening front will continue to push slowly toward the
southeast over the eastern half of the state today. North to
northwest winds have spread across most of the smaller islands,
while northerly winds near the frontal boundary may cause gusty
conditions across parts of the big island later today. The winds
over the smaller islands will gradually shift around to the
northeast today, and out of the east-northeast tonight.

Lingering clouds and showers with the front will cause brief MVFR
conditions from oahu to maui this morning, but conditions are
expected to gradually improve over the smaller islands later today
into tonight. Low clouds and showers are expected to produce
periods of MVFR conditions over portions of the big island through
this afternoon, as well as a chance of thunderstorms.

Airmet sierra is in effect for mountain obscuration due to low
clouds and showers on oahu, molokai, lanai, and maui. Conditions
are expected to improve across some of these islands throughout
the day, so this airmet may be cancelled for some of the smaller
islands this afternoon evening. The big island may be added to the
airmet later today as clouds and showers associated with the
front sag down across the area.

Marine
A slow-moving and weakening front over maui county will creep
southward through the next 24 hours or so as an area of high
pressure passes north of the state. For today, expect moderate to
fresh northeasterly winds along and north of the front and
variable winds to the south, along with a few thunderstorms
flaring on the frontal boundary. The high passing north of the
state will produce a brief period fresh to locally strong trade
winds late Saturday. This may produce small craft advisory (sca)
winds across the typically windy waters around the big island and
maui. On Sunday into early next week, winds will ease slightly and
veer out of the southeast and south as the surface ridge is
pushed over the islands by an approaching front.

A moderate and relatively short-period (10 to 12 seconds) north-
northwest swell will peak today. An SCA is in effect through the
afternoon around kauai and for waters north of oahu due to seas
at or near the 10 ft threshold. This swell will gradually decline
later today through the weekend, followed by a series of northwest
swells next week. The first of these swells will arrive Monday,
with surf remaining below advisory levels. A larger northwest
swell will likely produce advisory level surf late Tuesday and
Wednesday, while warning level surf will be possible Thursday and
Friday.

Hfo watches warnings advisories
Wind advisory until 6 pm hst this evening for big island summits.

Small craft advisory until 6 pm hst this evening for kauai
northwest waters-kauai windward waters-kauai leeward waters-
kauai channel-oahu windward waters.

R ballard TS wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 22 mi59 min N 12 G 13 75°F 76°F1017.7 hPa
KWHH1 44 mi47 min W 8 G 9.9 76°F 77°F1018.5 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 98 mi47 min NE 13 G 15 73°F 1019.1 hPa

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, HI22 mi36 minN 910.00 miPartly Cloudy78°F64°F64%1018 hPa

Wind History from HTO (wind in knots)
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Last 24hr------------------------------------------------
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
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Fri -- 01:19 AM HST     2.79 feet High Tide
Fri -- 04:24 AM HST     Moonset
Fri -- 06:57 AM HST     Sunrise
Fri -- 08:35 AM HST     0.40 feet Low Tide
Fri -- 12:51 PM HST     1.25 feet High Tide
Fri -- 03:51 PM HST     Moonrise
Fri -- 06:03 PM HST     Sunset
Fri -- 06:35 PM HST     -0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.82.72.421.510.60.40.40.60.91.21.21.10.90.50.1-0.1-0.10.10.51.11.8

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Fri -- 01:41 AM HST     2.80 feet High Tide
Fri -- 04:24 AM HST     Moonset
Fri -- 06:57 AM HST     Sunrise
Fri -- 08:16 AM HST     0.74 feet Low Tide
Fri -- 12:46 PM HST     1.44 feet High Tide
Fri -- 03:51 PM HST     Moonrise
Fri -- 06:03 PM HST     Sunset
Fri -- 07:03 PM HST     -0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.42.72.82.62.21.71.20.90.70.811.21.41.41.310.50.1-0.3-0.5-0.30.10.71.5

Weather Map and Satellite Images
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GOES Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for (17,4,5,8)
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Ground Weather Radar Station Kohala, HI
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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.