Thursday, January17, 2019 L-36.com


Marine Weather and Tides
Wainaku, 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 6:03PM Wednesday January 16, 2019 11:39 PM HST (09:39 UTC) Moonrise 2:06PMMoonset 2:24AM Illumination 86% Phase: Waxing Gibbous; Moon at 11 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- 906 Pm Hst Wed Jan 16 2019
Rest of tonight..South winds 15 knots. Wind waves 4 feet. Northwest swell 8 feet.
Thursday..South winds 15 knots. Wind waves 4 feet. Northwest swell 6 feet. Isolated showers in the morning.
Thursday night..South winds 15 knots. Wind waves 4 feet. Northwest swell 6 feet. Isolated showers through the night. Isolated Thunderstorms after midnight.
Friday..Northwest winds 20 knots veering north in the afternoon. Wind waves 4 feet. Northwest swell 8 feet. Isolated showers in the morning, then scattered showers and isolated Thunderstorms in the afternoon.
Friday night..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Saturday..East winds 15 knots. Wind waves 5 feet. Northwest swell 6 feet. Isolated showers through the day.
Saturday night..East winds 20 knots. Wind waves 6 feet. North swell 6 feet. Isolated showers.
Sunday..Southeast winds 20 knots. Wind waves 6 to 7 feet. North swell 4 to 6 feet.
Monday..Southeast winds to 25 knots easing to 15 knots. Wind waves 5 to 6 feet. Northwest swell 4 feet.
PHZ100 906 Pm Hst Wed Jan 16 2019
Synopsis for hawaiian coastal waters.. A front approaching the islands from the west will bring an increase in southerly winds tonight into Thursday. The front will reach kauai Thursday afternoon, then gradually dissipate as it stalls near maui on Friday. Local strong northeast trades will briefly return Saturday as a surface high passes north of the islands. Then another front will enter the far western offshore waters Sunday night. This will cause the winds to veer to the south Sunday and Monday.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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Fxhw60 phfo 170633
afdhfo
area forecast discussion
national weather service honolulu hi
833 pm hst Wed jan 16 2019

Synopsis
A cold front approaching kauai will cause increasing southerly
winds and wetter conditions over the western end of the island
chain by early Thursday. Showers, along with a chance of
thunderstorms, will accompany the front as it pushes down the
island chain from late Thursday through late Friday. Northerly
winds and drier conditions will fill in behind the front after it
passes. A brief period of trade winds is expected from late
Friday through Saturday as high pressure passes by north of the
area. Another front approaching the state early next week is
expected to produce another period of southerly winds and
increasing showers.

Discussion
An east-northeast to west-southwest oriented ridge is across the
state early this evening. Elsewhere, a cold front is located about
475 miles northwest of lihue. This feature is moving toward the
east-southeast at almost 15 mph. Winds remain relatively weak
across most of the state due to the surface ridge in the vicinity
of the state. However, southerly winds are beginning to increase
ahead of the front near kauai.

Aloft, an upper level ridge persists just east of the islands. The
axis of a broad upper level trough, which is supporting the cold
front, is located about 925 miles west-northwest of kauai.

Satellite imagery shows primarily broken stratocumulus clouds and
some cumulus clouds in the vicinity of the islands. Radar
indicates a few showers, which are moving rapidly toward the
northeast, are in the vicinity of niihau, kauai, oahu and
molokai. There are also isolated showers moving slowly toward the
west-northwest just south of the big island.

The forecast guidance suggests that the weather will remain
generally dry, with only spotty showers, through early Thursday
morning. As the cold front moves closer to the state, southwest
winds will increase, especially over the western end of the
state. These strengthening southwest winds will likely produce
increasing wind gusts over the north through east sides of the
western islands, especially on kauai and oahu on Thursday. The
coverage of showers will likely increase as the front moves closer
to the state. The forecast guidance continues to show
thunderstorms may also accompany the front. This is likely due to
the increasing instability associated with the front and the upper
level trough which will be approaching the state. Northerly winds
will fill in behind the cold front along with drier conditions.

The front is forecast to reach kauai late Thursday, then push
down the island chain, before reaching the big island late Friday.

Temperatures are expected to be cold enough to potentially
produce snow showers on the highest summits of the big island.

The winds will shift around to a more typical trade wind direction
from late Friday through Saturday as a surface high pressure
system passes by to the north of the area. Moisture associated
with the front may linger over the eastern end of the state, which
may produce some showers along windward sections.

The forecast models continue to indicate another front will
approach the islands Sunday and Monday. Once again, the surface
winds are forecast to swing around to the south ahead of this
feature. This front may reach kauai late Monday or Tuesday, with
showers expected to increase as it approaches.

Aviation
Winds have already begun increasing and veering to a more
southerly direction ahead of the approaching cold front.

The front is moving in from the northwest and is expected to reach
kauai towards evening tomorrow, Thursday. High clouds in advance
of the front will spread across the smaller islands by tomorrow
afternoon. MVFR conditions and isolated thunderstorms could
develop across kauai as early as noon tomorrow.

Meanwhile, a weak ridge of high pressure will keep the remainder
of the islands dry and stable. No airmets are currently in effect
and none are anticipated overnight.

Marine
A front will continue to approach the hawaiian islands from the
northwest tonight and will bring increasing southwest winds as
the front nears the state. Southwesterly winds will strengthen to
small craft advisory (sca) speeds across northwest waters near
kauai tonight into Thursday. Slightly further north of kauai
waters, a gale warning is in effect tonight into Thursday.

As the front enters the western offshore waters tonight, rain will
be on the increase along and ahead of the front. Latest satellite
imagery is showing a few isolated thunderstorms ahead of the
front. The threat for thunderstorms will be moving west to east
with the front and will persist through late Friday. Starting
Friday night, a fast moving high will build north of the state and
fresh to strong trades will briefly return. Another front will
begin to approach the area Sunday and is expected to enter the
northwest offshore waters Sunday night. This will once again shift
winds to the southeast on Sunday and south to southwest Sunday
night into Monday.

A moderate to large, short-period, northwest swell will build
Thursday night and peak early Friday, then slowly shift to the
north-northwest and fade over the weekend. This swell may briefly
reach advisory levels for exposed north and west facing shores
Thursday night and Friday. In the long range, an active weather
pattern will continue to produce small to moderate northwest swell
through early next week. A larger northwest swell is possible
towards the later half of next week.

Hfo watches warnings advisories
Small craft advisory from 6 am to 6 pm hst Thursday for kauai
northwest waters-kauai windward waters-kauai channel-oahu
windward waters.

Discussion... Houston
aviation... Bedal
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi51 min SE 2.9 G 4.1 71°F 76°F1014.2 hPa
KWHH1 46 mi45 min ENE 5.1 G 6 74°F 77°F1014.6 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, HI1 mi46 minS 410.00 miMostly Cloudy68°F64°F87%1014.5 hPa

Wind History from HTO (wind in knots)
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Last 24hrCalmCalmCalmW5CalmW6S3SW4W7W5S3SE5SE7E12E12SE11E5NE4NE3CalmSE4S4SW3S4
1 day agoS4CalmSW4SW4SW4SW6SW6SW6SW7SW6SW4CalmSE5E8E7E10E7CalmCalmCalmSW3SW4SW4SW4
2 days agoCalmSW5SW5SW6SW6SW6SW6W6SW6SW4S4S6SE7SE8SE12SE10SE10SE5SE4S3SW3CalmSW3S3

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 01:35 AM HST     2.25 feet High Tide
Thu -- 03:26 AM HST     Moonset
Thu -- 07:01 AM HST     Sunrise
Thu -- 08:40 AM HST     0.48 feet Low Tide
Thu -- 01:00 PM HST     0.91 feet High Tide
Thu -- 02:58 PM HST     Moonrise
Thu -- 06:05 PM HST     Sunset
Thu -- 06:51 PM HST     -0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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22.22.22.11.71.410.70.50.50.60.70.90.90.90.70.40.1-0.1-0.1-00.30.81.3

Weather Map and Satellite Images
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wmap_P
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 (4,6,7,8)
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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.