Monday, January22, 2018 L-36.com


Marine Weather and Tides
Hana, HI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 7:03AMSunset 6:12PM Monday January 22, 2018 2:24 AM HST (12:24 UTC) Moonrise 10:52AMMoonset 11:15PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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- 933 Pm Hst Sun Jan 21 2018
Rest of tonight..North winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Monday..North winds 20 knots. Wind waves 2 feet or less then 3 feet in the afternoon. Isolated showers through the day.
Monday night..North winds to 25 knots. Wind waves 3 feet. Isolated showers through the night.
Tuesday..North winds to 25 knots. Wind waves 3 feet. Isolated showers.
Tuesday night..North winds to 25 knots. Wind waves 3 feet. Isolated showers.
Wednesday..North winds to 25 knots. Wind waves 3 feet. Isolated showers through the day.
Wednesday night..East winds 10 knots. Wind waves 3 feet. Isolated showers in the evening.
Thursday..East winds 10 knots. Wind waves 2 feet or less. Haze. Isolated showers.
Friday..South winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. Haze. Isolated showers.
PHZ100 933 Pm Hst Sun Jan 21 2018
Synopsis for hawaiian coastal waters.. Ridge of high pressure will strengthen north of the islands through the first half of the week as weak low pressure to the north lifts northeastward and away from the region. The ridge will weaken through the second half of the week as low pressure passes far to the north and drags a front into the area.

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 220709
afdhfo
area forecast discussion
national weather service honolulu hi
909 pm hst Sun jan 21 2018

Synopsis
A long band of unstable cumulus clouds and showers near the big
island this evening will slowly drift north by tomorrow increasing
clouds and showers over maui county. Elsewhere moderate trade
winds will focus clouds and showers over windward and mountain
areas of each island. A weak upper level disturbance will help to
enhance shower activity through Wednesday. Lighter winds with land
and sea breezes are forecast from Thursday onward as the ridge
north of the islands weakens.

Discussion
Drier weather conditions were observed over the northern hawaiian
islands today mainly due to weaker than expected upper level
forcing. Higher showers will remain in the forecast for the big
island and maui tomorrow as the stream of unstable clouds drifts up
over both islands. The evening forecast was adjusted slightly to
decrease chances for precipitation tomorrow over kauai, oahu and
molokai with scattered showers mainly over windward and mountain
areas and isolated showers over leeward sections. Moisture trends
in the latest guidance continues to be on track with unsettled
weather spreading to the northern islands on Tuesday and
Wednesday.

The satellite analysis this evening shows the east pacific high
centered off the southern california coast and a long 2000 mile
band of unstable clouds and showers along 19n latitude drifting
into the big island. A weak cold frontal system has stalled just
northwest of kauai. The cloud band near the big island contains
scattered to numerous showers and will slowly drift northward over
the next 48 hours. Model guidance continues to show higher
precipitable water (pw) values in the 1 inch to 1.6 inch range
advecting northward likely increasing showers over maui tomorrow
and the northern islands by early Tuesday morning. An upper level
disturbance will also pass over the islands helping to lift the
boundary layer and increase both windward and leeward shower
coverage.

A stronger frontal system will move into the central pacific by
the middle of the week. This system will help break down the
ridge north of the islands allowing on-shore sea breezes and off-
shore land breezes to develop each day Thursday through Saturday.

Land surface heating during the daytime hours will produce clouds
and a few showers over interior sections with overnight clearing.

Aviation
Moderate trade winds will continue through Monday as a ridge of
high pressure persists to the north of the islands. Clouds and
showers will favor windward areas through the period, with
showers also reaching leeward areas from time to time. The
majority of the shower activity will remain over the eastern end
of the state however, where prevailing MVFR conditions are
expected tonight and Monday.

Airmet sierra is in effect for mountain obscuration across
windward sections of the big island and maui. These conditions are
expected to persist through the night and possibly through the
day on Monday.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of the terrain of all islands. The airmet is
expected to remain in place through Monday.

Marine
Guidance remains in good agreement and depicts fresh to strong trade
winds through the first half of the week as the ridge of high
pressure strengthens in the wake of a weak front passing to the
north. Advisory-level winds will likely setup over the windier
channel waters east of molokai and south of the big island,
beginning as early as tonight. A combination of winds and seas will
support small craft advisory conditions over most waters through as
late as Wednesday.

Ecmwf and GFS both support a downward trend for the local winds
through the second half of the week as a potent gale-force low
passes north of midway Monday night into Tuesday, then tracks slowly
northeastward to an area well north of hawaii Wednesday through
Friday. Light and variable (land sea breeze conditions) winds can't
be ruled out for the northwest islands as early as Thursday, then
for the entire state by Friday, which could linger into the weekend.

The high surf advisory in place for east facing shores continues
through 6 am hst Monday and will likely be extended due to a
persistent large area of strong trades south of high pressure
between hawaii and the west coast. Will continue to monitor buoy
trends and observations overnight and make final decision in the
late night package for which islands will be covered in this.

For northern shores, surf will steadily rise overnight and through
the day Monday as a new, long-period, west-northwest (300-310 deg)
swell fills in. Forerunners associated with this source have already
hit the offshore buoy northwest of kauai earlier today within the 18-
22 sec energy band, and are now showing up at the nearshore pacioos
hanalei and waimea buoys. This source will slowly fill in and likely
reach advisory levels for north and west facing shores of the
smaller islands by the end of the day Monday (potentially earlier
in the day for kauai). Surf will remain below advisory levels
along north and west facing shores of the big island from this
source.

For southern shores, surf will come up overnight into Monday as a
new, long-period, south (170-180 deg) swell fills in from recent
activity across the southern pacific. The nearshore pacioos pearl
harbor buoy has already begun to register an uptick in energy
within the lower frequency bands (16 sec) this evening. Will
likely see this source peak through the night Monday night, then
trend down into midweek. Current forecast is likely slightly
underdone and will be adjusted upwards in the overnight package.

Hfo watches warnings advisories
High surf advisory from midnight tonight to 6 pm hst Tuesday for
niihau-kauai leeward-waianae coast-oahu north shore-molokai
leeward.

High surf advisory until 6 pm hst Tuesday for kauai windward-
oahu koolau-molokai windward-maui windward west-windward
haleakala.

High surf advisory until 6 am hst Monday for olomana-south big
island-big island north and east.

Small craft advisory until 6 pm hst Tuesday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters-
pailolo channel-alenuihaha channel-big island windward waters-
big island leeward waters-big island southeast waters.

Discussion... Bohlin
aviation... Jelsema
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi55 min NE 2.9 G 11 73°F 75°F1016.1 hPa
51205 29 mi55 min 76°F9 ft
ILOH1 - 1617760 - Hilo, HI 87 mi55 min SW 9.9 G 11 69°F 74°F1016.2 hPa

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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G20
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G13
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N1
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G20
NE16
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NE14
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NE12
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NE15
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G25
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NE6
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S1
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E5
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G9
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G7
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G9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi31 minNE 1210.00 miFair71°F64°F81%1016 hPa

Wind History from HOG (wind in knots)
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Last 24hrE7E7SE3E6S4SE5NE8NE12
G20
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NE11E8NE9N9NE9NE10NE10NE11NE12
1 day agoCalmSE7SE6SE3S6S6CalmCalmCalmCalmNE14
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2 days agoE12
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NE7E6SE7S4S4S8
G23
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G34
E15
G26
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G25
NE12
G23
S9E9E12SE4E4SE7E6SE5S7SE6

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Mon -- 06:09 AM HST     2.15 feet High Tide
Mon -- 07:02 AM HST     Sunrise
Mon -- 10:51 AM HST     Moonrise
Mon -- 01:09 PM HST     0.13 feet Low Tide
Mon -- 06:08 PM HST     Sunset
Mon -- 07:45 PM HST     1.60 feet High Tide
Mon -- 11:14 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.711.41.722.12.11.81.410.60.30.10.20.40.81.11.41.61.61.41.20.9

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Mon -- 12:57 AM HST     0.46 feet Low Tide
Mon -- 07:04 AM HST     Sunrise
Mon -- 07:31 AM HST     1.82 feet High Tide
Mon -- 10:53 AM HST     Moonrise
Mon -- 02:16 PM HST     0.07 feet Low Tide
Mon -- 06:10 PM HST     Sunset
Mon -- 09:06 PM HST     1.34 feet High Tide
Mon -- 11:16 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.60.81.11.41.71.81.81.71.410.50.20.10.10.30.60.91.11.31.31.31.1

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 (7,2,3,4)
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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.