Friday, January19, 2018 L-36.com


Marine Weather and Tides
Heeia, 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 7:10AMSunset 6:14PM Friday January 19, 2018 7:23 AM HST (17:23 UTC) Moonrise 9:04AMMoonset 8:45PM Illumination 9% Phase: Waxing Crescent; Moon at 3 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- 335 Am Hst Fri Jan 19 2018
.small craft advisory in effect through early Saturday morning...
Today..East winds to 25 knots. Wind waves 12 feet. North swell 4 feet and east 5 feet. Slight chance of showers through the day.
Tonight..East winds 20 knots. Wind waves 10 feet. North swell 3 feet and east 6 feet. Slight chance of showers.
Saturday..East winds 20 knots veering southwest in the afternoon. Wind waves 9 feet. North swell 3 feet and east 6 feet. Slight chance of showers.
Saturday night..East winds 10 knots. Wind waves 7 feet. Mixed swell north 4 feet and east 6 feet. Slight chance of showers.
Sunday..East winds 15 knots. Wind waves 7 feet. Mixed swell north 5 feet and east 6 feet. Isolated showers in the morning.
Sunday night..East winds 15 knots. Wind waves 7 feet. Mixed swell northwest 6 feet and east 6 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 6 to 7 feet. Mixed swell northwest 7 to 8 feet and east 5 to 6 feet. Isolated showers.
Tuesday..East winds 15 knots. Wind waves 7 to 8 feet. Mixed swell northwest 5 to 7 feet and east 5 feet. Scattered showers.
PHZ100 335 Am Hst Fri Jan 19 2018
Synopsis for hawaiian coastal waters.. Strong high pressure north-northeast of the islands will continue to move east through today, resulting in softening trade winds. A trough will form and dissipate over the offshore waters just west of kauai during the weekend. An approaching front will cause winds to become southeast over the western waters by the middle of next week.

7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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Fxhw60 phfo 191424
afdhfo
area forecast discussion
national weather service honolulu hi
424 am hst Fri jan 19 2018

Synopsis
A strong high pressure center located northeast of hawaii this
morning will continue to drift away from the state resulting in
diminishing wind speeds today. Expect windy weather to persist
along the kohala district of the big island through the morning
and into the afternoon hours today. Wind speeds will weaken
tomorrow as the high moves far enough away from the state,
allowing land and sea breezes to develop along southern and
western slopes of all islands from Sunday onward. For next week,
light east to southeast wind directions will shift to
southeasterly by Wednesday with southerly flow possible by the end
of the week as a cold front approaches the islands from the
northwest.

Discussion
Wind speeds have diminished as a high pressure center roughly
1000 miles northeast of hawaii continues to move eastward away
from the state. A low pressure area with a cold front continues to
move across the central pacific helping to weaken the high
pressure ridge axis north of the islands. The high wind warning
for leeward kohala on the big island was downgraded to a wind
advisory and will be in effect through this afternoon. All other
wind advisories have been cancelled.

This weekend... Wind speeds have decreased this morning as the
high pressure ridge north of the islands continues to weaken. A
cold frontal boundary will stall approximately 300 nautical miles
northwest of kauai as wind directions range from east to
southeast over the islands. Lighter east to southeast wind speeds
will allow on-shore sea breezes to develop along the south and
west slopes of all islands by Sunday morning with off-shore land
breezes developing by Sunday night.

Monday and Tuesday... The ridge aloft remains weak with light
east to southeasterly winds. Meanwhile an upper level trough
shown on the 500 mb chart is expected to drift into the hawaiian
islands. This trough will set up around 300 miles northeast of
the islands likely enhancing upstream shower activity on Tuesday.

Forecast guidance on the intensity of this upper level trough
between the european (ecmwf) model and the american (gfs) model
has shown more consistency over the past 12 hours.

Wednesday through next Thursday... A deeper low pressure system
is forecast to sweep across the central pacific with a cold front
approaching the islands from the northwest. Wind directions will
veer towards the south by Thursday as pressure gradients shift
ahead of this next frontal system. The plume of volcanic fog or
vog may be drawn northward into the smaller islands by Thursday.

The highest chances for showers will develop over island interior
sections each afternoon as a plume of deeper tropical moisture
with precipitable water (pw) amounts ranging from 1.25 to 1.75
inches are being drawn up from the south near kauai by the end of
the week. Both global weather models are in good agreement with
this solution and therefore we should expect elevated chances for
showers along prefrontal convergence bands in this developing
weather pattern. Stay tuned.

Aviation
Trade winds are beginning to veer and weaken. Moderate turbulence
persists across leeward kohala district on the big island, and
thus airmet tango continues there. The turbulence airmet has been
cancelled elsewhere. Airmet tango persists for strong surface
winds across leeward kohala.

Vfr conditions will prevail, however passing clouds and showers
will bring periods of MVFR conditions. No mountain obscuration is
anticipated.

Marine
Trade wind have started to weaken area-wide this early Friday
morning. The gale warning (gw) for selected waters around maui and
big island counties has been lowered to a small craft advisory
(sca). And the SCA has been canceled for the leeward waters. This
softening of the trades is due to the surface high continuing to
pull further away from the islands. The high is currently a
thousand nautical miles nne of the maui. The coverage of the sca,
due to winds, will shrink to the waters south of the big island
by tonight. However, due to elevated seas generated east of the
big island, the SCA will persist over most of the windward waters
into Saturday. We expect seas to subside to below advisory level
of 10 feet, and the subsequent cancellation of the SCA on Sunday
night. The high surf advisory (hsa) for east facing shores has
been extended through 6 am hst Saturday.

Surf will remain below advisory levels for the remaining shoreline
through this weekend. A small northwest swell (330 degrees) is
expected arrive Saturday night, and be reinforced with a moderate
west- northwest (300 degrees) swell on Sunday night through
Monday, peak Monday night, followed by a gradual decline through
Wednesday. This second swell may warrant an hsa for the north
facing shores of some of the smaller islands.

Hfo watches warnings advisories
High surf advisory until 6 am hst Saturday for kauai windward-
oahu koolau-olomana-molokai windward-maui windward west-windward
haleakala-south big island-big island north and east.

Wind advisory until 6 pm hst this evening for kohala.

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

Discussion... Bohlin
aviation... Powell
marine... Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi53 min E 9.9 G 14 73°F 75°F1019.8 hPa
51210 4 mi53 min 76°F11 ft
51202 - Mokapu Point, HI (098) 7 mi49 min 76°F14 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi53 min ENE 8.9 G 16 73°F 75°F1018.5 hPa
51211 13 mi53 min 76°F4 ft
51201 - Waimea Bay, HI (106) 23 mi51 min 74°F9 ft

Wind History for Mokuoloe, HI
(wind in knots)    EDIT      (on/off)   Help
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E11
G17
E15
G21
E16
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G21
E15
G21
E13
G17
E12
G17
E14
G23
E18
G23
E20
G25
E15
G21
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E16
G23
E10
G17
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G21
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G15
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E6
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NE15
G20
NE16
G21
NE16
NE18
G22
NE19
G23
NE20
E18
G22
E15
G22
NE18
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G21
NE16
G20
E16
G21
E18
G24
NE15
G19
E13
G19
E16
G21
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E14
G20
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G20
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G22
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NE10
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G14
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G13
NE12
NE8
G13
NE8
G12
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G13
NE11
G14
NE11
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G15
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G16
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G16
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G16
NE12
G17
NE12
G16
NE13
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi86 minE 12 G 2210.00 miOvercast74°F68°F82%1018.2 hPa
Daniel K Inouye International Airport, HI9 mi30 minENE 16 G 2210.00 miMostly Cloudy75°F64°F71%1018.9 hPa
Wheeler Air Force Base / Oahu, HI12 mi27 minN 010.00 miOvercast70°F65°F86%1019.5 hPa
Oahu, Kalaeloa Airport, HI16 mi30 minENE 610.00 miMostly Cloudy73°F66°F79%1019.8 hPa

Wind History from HNG (wind in knots)
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Last 24hrE11
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G25
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G27
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E11
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NE11
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G24
1 day agoNE13
G21
NE15
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G28
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2 days agoSE4NE10--NE10NE10NE9----NE11--NE10NE9NE9NE9NE12
G16
NE12E9
G15
NE11NE12NE13
G18
NE14
G19
NE10
G20
NE12
G18
NE13
G19

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Fri -- 05:37 AM HST     2.08 feet High Tide
Fri -- 07:11 AM HST     Sunrise
Fri -- 09:03 AM HST     Moonrise
Fri -- 12:44 PM HST     0.10 feet Low Tide
Fri -- 05:49 PM HST     0.78 feet High Tide
Fri -- 06:13 PM HST     Sunset
Fri -- 08:45 PM HST     Moonset
Fri -- 11:02 PM HST     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.511.41.822.11.91.51.10.70.30.10.10.20.40.60.70.80.70.50.30.10.1

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Fri -- 04:40 AM HST     2.09 feet High Tide
Fri -- 07:10 AM HST     Sunrise
Fri -- 09:02 AM HST     Moonrise
Fri -- 12:02 PM HST     0.20 feet Low Tide
Fri -- 04:55 PM HST     0.85 feet High Tide
Fri -- 06:12 PM HST     Sunset
Fri -- 08:45 PM HST     Moonset
Fri -- 10:20 PM HST     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.511.41.822.11.91.61.20.80.50.30.20.30.40.60.80.90.80.60.50.30.20.2

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
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GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (12,3,4,5)
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Ground Weather Radar Station Molokai, 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.