Monday, August20, 2018 L-36.com


Marine Weather and Tides
Hana, HI

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Sunrise 6:05AMSunset 6:52PM Monday August 20, 2018 5:04 AM HST (15:04 UTC) Moonrise 2:53PMMoonset 1:22AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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PHZ119 Maalaea Bay- 1229 Am Hst Mon Aug 20 2018
.small craft advisory in effect through Tuesday afternoon...
Rest of tonight..North winds 25 knots. Wind waves 2 feet or less.
Monday..North winds 25 knots. Wind waves 2 feet or less.
Monday night..North winds 25 knots. Wind waves 3 feet.
Tuesday..North winds 25 knots. Wind waves 3 feet. Scattered showers in the afternoon.
Tuesday night..North winds 20 knots. Wind waves 3 feet.
Wednesday..North winds 20 knots. Wind waves 3 feet.
Wednesday night..North winds 20 knots in the evening becoming variable less than 10 knots. Wind waves 3 feet. Isolated showers after midnight.
Thursday..Northeast winds 20 knots. Wind waves 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Thursday night.. Tropical storm conditions possible. Scattered showers in the evening.
Friday.. Tropical storm conditions possible. Scattered showers.
PHZ100 1229 Am Hst Mon Aug 20 2018
Synopsis for hawaiian coastal waters.. A weak trough west of kauai will move west and dissipate today while high pressure builds to the distant north. Hurricane lane, centered near 13.8n 147.0w at 11 pm hst Sunday is moving west at 12 kt. Lane is forecast to pass to the south and southwest of all islands this week, potentially bringing dangerously strong winds and rough seas and swells.


7 Day Forecast for Marine Location Near Hana, HI
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location: 20.77, -155.98     debug


Area Discussion for -
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Fxhw60 phfo 201355
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Mon aug 20 2018

Synopsis
A drier airmass will persist across the state through Tuesday, with
trade winds strengthening. For the remainder of the week, the
forecast will be highly dependent on the track and intensity of
hurricane lane. An increase in winds and showers will be the likely
result based on the latest forecast for lane.

Discussion
Please note that tropical cyclone operations are in effect. So as
to incorporate the latest forecast information from the central
pacific hurricane center (cphc), public forecast updates from the
honolulu forecast office will come shortly after forecast updates
from cphc, namely after 5 and 11 am pm, instead of the normal 4
am pm.

Drier airmass has spread across the state since last night, though
early morning lihue sounding only indicated a slight drying, while
hilo sounding has a more typical trade wind weather type profile.

Latest radar data revealed not much showers, though satellite
imagery, even with some high clouds obscuring, indicated there are
embedded low clouds just upstream east of the islands. A surface
high pressure far northeast of the state providing the trade winds
continues to drop south-southwestward. Meanwhile another high
pressure far northwest of the state is advancing east as well. This
will allow a tightening of pressure gradient across the area,
resulting in an increase in trade winds for the state. Regardless,
the more typical trade wind weather is back across area, with
passing low clouds and showers affecting mainly windward and
mountain areas. High clouds will stream over the area at times today
and will keep skies a little more opaque at times.

The aforementioned two highs will gradually merge and take up a
position far to our north by Tuesday. This will lead to a further
strengthening in trade wind speeds across area. The somewhat drier
and more stable airmass will persist in the as well. Therefore,
expect breezy trade wind weather for the islands Tuesday, with
passing low clouds and showers affecting mainly windward and
mountain areas. Lee areas of the smaller islands may also see some
clouds and showers as winds may be strong enough to carry them over.

As for Wednesday through the weekend time frame, our weather will be
highly dependent on the track and intensity of hurricane lane. It is
still too early to determine the weather impacts from lane will have
on the state. The last forecast track from the central pacific
hurricane center still has lane passing south of the main hawaiian
islands, but has it tracked closer to the island chain. If this
track holds, the potential impacts on the islands weather would be
an increase in wind speeds due to a tightened pressure gradient
between high pressure north of the state and lane traversing to our
south. Also moisture associated with lane would likely bring an
increase in shower activity over the big island Wednesday, mainly
east and southeast and then eventually spreading up the island chain
through the remainder of the week.

Everyone is encouraged to monitor the latest advisories on hurricane
lane from the central pacific hurricane center.

Aviation
A high pressure ridge north of the islands will produce stronger
trade winds today with with improving weather trends as drier more
stable air moves in from the east.

No airmets in effect. As winds strengthen and the atmosphere
becomes more stable this afternoon, turbulence in the lee of the
mountains may become moderate and airmet tango may be needed.

Marine
Please note that tropical cyclone operations are in effect. So as to
incorporate the latest forecast information from the central pacific
hurricane center (cphc), marine forecast updates from the honolulu
forecast office will come shortly after forecast updates from cphc,
namely shortly after 5 and 11 am pm, instead of the normal 4 and 10
am pm.

A weak surface trough W of kauai will move W away from the area
today and tonight as high pressure builds to the n. This will result
in a gradually increasing trade wind flow through Tuesday. A small
craft advisory (sca) has been posted for the windier areas around
maui and the big island in anticipation of the increasing trade wind
flow. As hurricane lane moves into an area S of the islands by
mid-week, the pressure gradient will likely increase, likely leading
to increasing trade winds, and potentially an expansion of the sca.

More significantly, tropical storm and or hurricane watches may be
required for portions of the southern coastal waters later today.

There is significant uncertainty regarding the position and
intensity of lane later in the week, so it is too early to determine
what impacts lane may eventually bring, and mariners need to
continue to closely monitor forecasts.

Long period ese swells from hurricane lane are building at buoy
51004 to the SE of the big island this morning, while the pacioos
buoy in hilo is just beginning to detect long-period energy from the
e. A high surf advisory for E facing shores of maui and the big
island is now in effect. As hurricane lane moves into an area S of
the islands later this week, S swell will likely increase, with a
wide variety of wave periods leading to rough and potentially
damaging surf. Still significant uncertainty and difficult to know
the level of impacts, but there is potential for large seas swells
from lane to lead to warning-level surf along E through S facing
shores of the islands. A small nnw swell is expected to arrive
Monday and peak on Tuesday before gradually diminishing Wednesday
and Thursday.

See the latest oahu surf discussion (srdhfo) for more details on
surf and swell.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Tuesday for windward haleakala-
south big island-big island north and east.

Small craft advisory until 6 pm hst Tuesday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Synopsis discussion... Hui
aviation... Bohlin
marine... Birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi40 min NE 8.9 G 14 79°F 83°F1014.6 hPa
51205 29 mi34 min 80°F5 ft
ILOH1 - 1617760 - Hilo, HI 87 mi40 min SW 2.9 G 4.1 75°F 79°F1014.6 hPa

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi70 minNE 1510.00 miFair78°F73°F85%1014.8 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE4NW5Calm64NE14
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4NW8NW5E7NE9NE11NE12E7NE7NE10NE8NE15NE6
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NE10E9SE4E5CalmN4CalmCalmCalmS4Calm
2 days agoNE9NE3NE13NE13--NE18NE19
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NE18NE19NE14NE15NE13NE17NE13NE8NE8NE6NE13N7NE5

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Mon -- 01:22 AM HST     Moonset
Mon -- 03:58 AM HST     0.34 feet Low Tide
Mon -- 06:04 AM HST     Sunrise
Mon -- 11:50 AM HST     2.47 feet High Tide
Mon -- 02:52 PM HST     Moonrise
Mon -- 06:49 PM HST     Sunset
Mon -- 07:02 PM HST     0.57 feet Low Tide
Mon -- 11:36 PM HST     1.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.210.70.40.30.40.611.41.82.22.42.52.321.61.20.90.60.60.70.91.21.3

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Mon -- 01:24 AM HST     Moonset
Mon -- 04:53 AM HST     0.27 feet Low Tide
Mon -- 06:06 AM HST     Sunrise
Mon -- 12:36 PM HST     2.26 feet High Tide
Mon -- 02:54 PM HST     Moonrise
Mon -- 06:51 PM HST     Sunset
Mon -- 07:39 PM HST     0.68 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.110.80.50.30.30.40.60.91.31.722.22.22.11.71.410.80.70.70.80.91

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (11,2,3,4)
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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.