Tuesday, March28, 2017 L-36.com


Marine Weather and Tides
Hana, 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 6:20AMSunset 6:40PM Tuesday March 28, 2017 5:23 PM HST (03:23 UTC) Moonrise 6:59AMMoonset 7:39PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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- 332 Pm Hst Tue Mar 28 2017
Tonight..North winds 15 kt. Wind waves 2 ft or less.
Wednesday..Northwest winds 15 kt. Wind waves 2 ft or less.
Wednesday night..North winds 15 kt. Wind waves 2 ft or less.
Thursday..Northwest winds 10 kt. Wind waves 2 ft or less.
Thursday night..North winds 15 kt. Wind waves 2 ft or less.
Friday..North winds 20 kt. Wind waves 2 ft or less.
Friday night..North winds to 25 kt. Wind waves 2 ft or less.
Saturday..North winds to 25 kt. Wind waves 3 ft.
Sunday..North winds to 25 kt. Wind waves 8 ft.
PHZ100 332 Pm Hst Tue Mar 28 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the islands will shift east through midweek as a cold front passes far north of the state. High pressure will build north of the state over the weekend.

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 290202
afdhfo
area forecast discussion
national weather service honolulu hi
402 pm hst Tue mar 28 2017

Synopsis
A surface ridge north of the state will maintain light to
moderate east to east-southeast surface winds across the islands
through Friday. An upper level trough, which will dig east of the
island chain later tonight and Wednesday, is expected to bring an
increase in showers early Wednesday morning through Saturday. A
surface high building far northeast of the area starting late
Friday will produce breezy trades this weekend.

Discussion
A nearly stationary 1031 mb surface high is centered far east-
northeast of hawaii this afternoon. A surface ridge extends west-
southwest from this high passing about 300 miles north of kauai.

The pressure gradient south and southwest of these features is
maintaining light to moderate east to east-southeast wind flow
across the state. Water vapor imagery shows a shortwave trough
near oahu this afternoon digging towards just east of the state.

Afternoon soundings at hilo and lihue show dry and stable
midlevels, strong inversions and below normal precipitable water
values of 0.8 to 1 inch. Radar shows that much of the showers
from this morning have dissipated this afternoon. Due to the light
wind flow over the state, sea breezes have resulted in cloud build
ups over the leeward sides of the islands this afternoon. These
clouds should gradually dissipate this evening.

Water vapor imagery shows a shortwave trough currently passing
north of oahu, and is expected to merge into a much stronger
trough aloft east of the state by Wednesday morning before slowly
tracking away to the east through this weekend.

The surface ridge is expected to remain north of the islands through
Thursday night, which will continue to drive the light to moderate
east to east-southeast flow. With trade winds upstream, models
show an increase in showers expected to push in from the east
early Wednesday morning. The presence of this trough aloft east of
the area will enhance the low clouds and precipitation tracking in
from upstream through Saturday. The light winds will also continue
on Friday.

Therefore, expect wetter trade wind type weather after tonight
with the relatively weak low level flow focusing most of these low
clouds and showers over windward and southeast facing slopes.

While leeward areas should stay relatively dry at night, sea breezes
will continue to dominate over the next several days and produce
cloud build ups and showers. Given the relative atmospheric stability
over hawaii, showers enhanced by the upstream trough will likely
be loosing their intensity as they reach the islands. Therefore,
while it will likely be wetter than it has been, we do not
anticipate a flooding-type situation.

The surface ridge to our north is expected to erode some time on
Thursday, as a cold front approaches from the northwest. This
front will likely stall and weaken two to three hundred miles
north-northwest of kauai by late Friday, so it is not expected to
ever reach the state. However, the forecast models continue to
suggest a band of clouds and showers will form near the western
end of the state to the southeast of the front. These low clouds
and showers might produce moderate rains over parts of the state,
particularly the western islands, late Thursday and Friday.

Surface high pressure is expected to build far northeast of the region
this weekend, which will likely produce breezy trade winds across
the hawaiian islands beginning Friday night through early next
week. Clouds and showers will continue on Saturday, but a slightly
drier air mass is expected over most of the state beginning on
Sunday.

Aviation
Airmet sierra for mountain obscuration was recently cancelled as
lingering clouds and showers have continued to thin after a brief
uptick in coverage. The big island has the most clouds overhead
this afternoon, but expect clouds to thin overnight. The clouds
are topping out around 9000 ft. The north to south oriented jet
forecast to be over the islands this afternoon has not been as
strong as the models indicated, so have not issued a sigmet. Will
continue to monitor the situation.

Marine
The west-northwest (290-310 deg) swell that peaked Sunday into
Monday will hold through mid week due to a slight reinforcement
tonight into Wednesday. A combination of this swell and moderate
to fresh breezes over the channels and waters around the big
island will continue to generate rough boating conditions.

Although the winds have dropped slightly below small craft
advisory levels (25 kt), seas will hold around 10 ft through the
day today across windward waters between the big island and oahu.

As a result, the small craft advisory will remain up across these
areas for seas today. Surf associated with the west-northwest
swell should remain just below advisory levels along exposed
north and west facing shores through mid week.

Winds should remain below advisory levels through Friday as the
ridge of high pressure north of the state slightly weakens in
response to a two weak cold fronts passing north of the area.

Advisory- level winds will likely return across portions of the
waters over the weekend as high pressure builds north of the state
behind the second front.

Surf along east facing shores will remain small and choppy through
the week due to persistent moderate to fresh onshore winds, but
increase over the weekend as winds strengthen again locally. A
slight increase in surf along south facing shores will be possible
Thursday through Saturday due to a long-period swell (190 deg)
associated with recent activity across the southern pacific.

The main forecast challenge will be centered on another, slightly
larger, west-northwest (290-310 deg) swell that will impact the
islands Thursday night through the weekend. This is due to a powerful
storm-force low currently tracking east-northeastward across the
northwest pacific. Recent ascat and altimeter obs support latest model
model runs with regard to wind speeds and resulting sea heights.

The large west-northwest swell associated with this system could
reach the islands as early as Thursday night, peak through the day
Friday and Friday night, then slowly ease over the upcoming
weekend. Warning-level surf and advisory-level seas are expected
Friday into the weekend before trending down through the beginning
of next week. The southern shores could see impacts from this
swell again at select spots due to wrapping around the islands.

Hfo watches/warnings/advisories
None.

Discussion... Foster
aviation... M ballard
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi54 min NE 12 G 19 77°F 78°F1016.4 hPa
51205 29 mi45 min 76°F6 ft
51203 - Kaumalapau, HI (146) 55 mi39 min 80°F4 ft
ILOH1 - 1617760 - Hilo, HI 87 mi54 min ESE 8 G 13 81°F 76°F1017.1 hPa

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW4
G9
W7
G13
NW8
N3
G7
NE1
S1
W4
G8
SE2
NW5
NE1
SE1
NW8
G12
NW2
N3
SE4
NW2
NE15
G19
NE14
G19
NE14
G17
NE16
G20
NE15
G20
NE15
G23
NE16
G20
NE15
G19
1 day
ago
NE18
G27
NE23
G29
NE13
G20
E7
G17
SE5
NW10
W7
G11
NW8
NE5
N2
G5
NW11
NW6
NW6
S1
SW1
SE4
G10
NE8
G13
NE14
G19
NE21
G26
NE21
NE20
NE17
G21
NE14
G19
NE13
G18
2 days
ago
NE17
G23
NE15
G23
NE14
G17
NE11
G16
NE11
G15
E11
G14
NE14
G21
N12
NE11
G17
NE16
G23
NE15
G21
NE16
G20
NE15
G20
SE5
NE15
G25
N2
G7
N11
G16
NE22
G28
NE24
G30
NE22
G32
NE25
G33
NE24
G33
NE24
G34
NE25
G34

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi30 minNE 15 G 2210.00 miPartly Cloudy84°F63°F49%1016.6 hPa

Wind History from HOG (wind in knots)
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Last 24hr3W7SE6E6SE7SE6SE6S5SE6SE7S4S3CalmNE6SE3CalmE9
G20
E14
G23
E19
G23
E14
G24
E14
G24
NE19
G24
NE15
G20
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G22
1 day agoE19
G29
E15
G25
E13
G23
E9
G16
SE6CalmE4SE6SE7E4CalmSE7S3SE8S3SE6E10
G19
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G22
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G24
E14
G23
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E18
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E12
G19
2 days agoNE16
G23
NE13
G18
NE14
G22
E12
G20
NE7E7NE16
G23
NE13NE9NE14
G23
NE12
G23
NE14NE12
G17
SE9NE15
G27
S44NE22
G30
NE20
G29
NE23
G31
NE25
G33
NE20
G35
E22
G34
NE20
G35

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Tue -- 03:02 AM HST     2.05 feet High Tide
Tue -- 06:20 AM HST     Sunrise
Tue -- 06:59 AM HST     Moonrise
Tue -- 09:06 AM HST     -0.23 feet Low Tide
Tue -- 03:39 PM HST     2.15 feet High Tide
Tue -- 06:37 PM HST     Sunset
Tue -- 07:38 PM HST     Moonset
Tue -- 09:40 PM HST     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.921.91.510.4-0-0.2-0.10.20.81.31.82.12.11.91.40.90.40.100.2

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Tue -- 04:18 AM HST     1.85 feet High Tide
Tue -- 06:22 AM HST     Sunrise
Tue -- 07:01 AM HST     Moonrise
Tue -- 10:18 AM HST     -0.17 feet Low Tide
Tue -- 04:53 PM HST     1.97 feet High Tide
Tue -- 06:39 PM HST     Sunset
Tue -- 07:40 PM HST     Moonset
Tue -- 10:50 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.91.31.71.81.81.510.50.1-0.2-0.10.20.61.11.61.921.81.40.90.50.10

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 (23,6,7,8)
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Ground Weather Radar Station Kohala, 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.