Monday, March27, 2017 L-36.com


Marine Weather and Tides
Kaneohe Station, 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 6:26AMSunset 6:46PM Monday March 27, 2017 4:36 AM HST (14:36 UTC) Moonrise 6:22AMMoonset 6:45PM Illumination 0% Phase: New Moon; Moon at 0 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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PHZ116 Kaiwi Channel- 343 Am Hst Mon Mar 27 2017
.small craft advisory in effect through late this afternoon...
Today..East winds 20 kt. Wind waves 7 ft. Northwest swell 8 ft.
Tonight..East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft.
Tuesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft. Isolated showers in the morning.
Tuesday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft.
Wednesday..East winds 15 kt. Wind waves 6 ft. Northwest swell 7 ft. Isolated showers.
Wednesday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Isolated showers in the evening. Scattered showers after midnight.
Thursday..East winds 15 kt. Wind waves 6 ft. Northwest swell 6 to 8 ft. Isolated showers.
Friday..East winds 15 kt. Wind waves 5 to 6 ft. Northwest swell 10 to 12 ft. Isolated showers.
PHZ100 343 Am Hst Mon Mar 27 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. A large west-northwest swell is expected to enter the area late on Thursday.

7 Day Forecast for Marine Location Near Kaneohe Station, HI
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location: 21.47, -157.77     debug


Area Discussion for -
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Fxhw60 phfo 271345
afdhfo
area forecast discussion
national weather service honolulu hi
345 am hst Mon mar 27 2017

Synopsis
A surface ridge will remain north of the islands through next
weekend. A ridge aloft will remain over the islands through the
middle of the week. During the second half of the week, a trough
aloft and a front will approach from the northwest. The front will
stall north of the area over the weekend. A strong new high will
build northeast of the islands early next week.

Discussion
A 1030 mb high lies about 1650 miles northeast of honolulu near 36n
136w, with a surface ridge extending southwest from the high to 375
miles north of honolulu. The ridge will remain north of the islands
through next weekend. The ridge will weaken over the next 12 hours
as a front passes by far north of the area. As a result, the trade
winds will weaken a bit and remain at moderate strength through
Friday.

A ridge aloft will remain over the main hawaiian islands through
tomorrow night. The ridge will keep the atmosphere dry and stable,
so rainfall will remain light. Starting Wednesday, a deep trough
aloft and an associated front will approach from the northwest. The
front is expected to stall about 300 miles northwest of kauai Friday
night, but atmosphere over the islands will become more moist and
less stable. Showers will likely become more active starting
Wednesday.

A strong new high will move east behind the front and is forecast to
be north of the islands by Friday night. Trade winds will strengthen
over the weekend and become quite breezy by early next week.

Marine
The current large west-northwest (wnw; 290-310 deg) swell will
slowly ease into Tuesday, then hold through mid week due to a slight
reinforcement Wednesday. A combination of this swell and fresh to
strong trade winds over waters around the big island will continue
to generate rough boating conditions today. The small craft advisory
will remain up over most marine areas due to a combination of seas
and winds. Winds and seas are forecast to drop below advisory levels
through mid week (Tuesday through Thursday) as the ridge of high
pressure north of the state slightly weakens in response to a
passing cold front well north of the area. Another cold front is
forecast to approach the region later in the week, then stall and
weaken north and northwest of the area into the upcoming weekend.

Surf along east facing shores will remain small and choppy through
the week due to moderate to strong onshore winds persisting.

Surf along south facing shores will likely remain up today due to
the large wnw swell wrapping around the islands and a small south-
southwest (ssw; 220 deg) long-period swell that is forecast to fill
in. A slight increase in surf along south facing shores is possible
Thursday through Saturday due to a long-period swell (190 deg)
associated with a low southeast of new zealand.

Later in the week, the main forecast challenge will become centered
on another, potentially larger, wnw (310 deg) swell that will impact
the islands Thursday night through the weekend. A powerful low that
has already developed off the coast of japan, based on the latest
satellite trends and surface analysis. An ascat pass overnight
reflected this developing system and showed a decent sized batch of
storm to near hurricane force winds (50-63 kt) out of the west
focused toward the region. Model consensus depicts this system
rapidly deepening to around 980 mb today while lifting northeastward
across the northwest pacific. The westerly wind field associated
with this system is expected to expand through this period and
remain at storm force levels over a large area with seas reaching as
high 35 to 40 ft. As this system evolves and lifts northeastward to
the date line by mid week, a large westerly swell will result, that
could reach the islands as early as Thursday night, peak through the
day Friday, then slowly ease over the upcoming weekend. Some
uncertainty regarding the details this far out still exists due to
some model differences depicted between the ecmwf-wave and gfs-
wavewatch iii solutions.

More details will follow in later packages this week as this system
evolves and confidence increases with regard to specifics on arrival
times and impacts.

Aviation
No airmets are in effect and none are expected over the next couple
of days. Clouds and showers will remain sparse, soVFR ceilings and
visibilities will prevail. Moderate easterly trade winds will
continue.

Hfo watches/warnings/advisories
High surf advisory until 600 pm today for north and west facing
shores of niihau, kauai, oahu and molokai, north facing shores of
maui, and west facing shores of the big island.

Small craft advisory through 600 pm Monday for all hawaiian waters
except oahu leeward waters and maalaea bay.

Marine... Gibbs
remainder... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51210 1 mi37 min 76°F6 ft
51207 1 mi42 min 75°F6 ft
MOKH1 - 1612480 - Mokuoloe, HI 3 mi61 min E 9.9 G 13 76°F 79°F1019.3 hPa
51202 - Mokapu Point, HI (098) 6 mi63 min 77°F8 ft
OOUH1 - 1612340 - Honolulu, HI 13 mi49 min E 5.1 G 8 76°F 78°F1019.8 hPa
51201 - Waimea Bay, HI (106) 23 mi35 min 75°F9 ft

Wind History for Mokuoloe, HI
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Last
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E11
G16
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G14
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G17
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G20
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E5
G8
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G11
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G14
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G17
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G15
E7
G12
NE12
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G13
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E8
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W4
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E7
G12
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G15
E2
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G12
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G16
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G18
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G14
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G6

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Honolulu, Honolulu International Airport, HI12 mi44 minENE 710.00 miA Few Clouds75°F64°F69%1019 hPa
Wheeler Air Force Base / Oahu, HI14 mi99 minW 310.00 miPartly Cloudy65°F63°F93%1018.7 hPa
Oahu, Kalaeloa Airport, HI19 mi44 minNNE 410.00 miFair71°F63°F76%1020.2 hPa

Wind History from HNG (wind in knots)
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Last 24hrE8
G14
E10E10E10--E10E10
G17
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G16
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G18
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G20
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NE13
G19
NE9
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G16
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G14
5E7
1 day agoE6----E5----3E5E6E7E7NE9NE11
G15
E10
G17
--NE10NE10E8NE7
G16
E10
G17
--E11
G15
E6--
2 days ago--E4E3E8CalmCalmNW3CalmSE5E10
G15
E11
G17
NE4E7E10
G17
E11
G17
E9
G18
E12
G17
6E9
G15
E7----E9E6

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Mon -- 03:36 AM HST     1.73 feet High Tide
Mon -- 06:22 AM HST     Moonrise
Mon -- 06:28 AM HST     Sunrise
Mon -- 09:58 AM HST     -0.25 feet Low Tide
Mon -- 04:06 PM HST     1.53 feet High Tide
Mon -- 04:59 PM HST     New Moon
Mon -- 06:44 PM HST     Sunset
Mon -- 06:45 PM HST     Moonset
Mon -- 10:08 PM HST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.611.41.71.71.51.10.60.2-0.1-0.2-0.10.20.61.11.41.51.41.20.80.30-0.1-0

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Mon -- 02:38 AM HST     1.68 feet High Tide
Mon -- 06:21 AM HST     Moonrise
Mon -- 06:27 AM HST     Sunrise
Mon -- 09:12 AM HST     -0.19 feet Low Tide
Mon -- 03:08 PM HST     1.52 feet High Tide
Mon -- 04:59 PM HST     New Moon
Mon -- 06:44 PM HST     Sunset
Mon -- 06:44 PM HST     Moonset
Mon -- 09:25 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.41.61.71.51.10.70.3-0-0.2-0.10.20.611.41.51.41.20.80.40.1-0-00.2

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 (10,2,3,4)
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Ground Weather Radar Station Molokai, 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.