Thursday, July19, 2018 L-36.com


Marine Weather and Tides
Kapalua, HI

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:54AMSunset 7:10PM Wednesday July 18, 2018 8:08 PM HST (06:08 UTC) Moonrise 11:45AMMoonset 12:00AM Illumination 37% 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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PHZ120 Pailolo Channel- 338 Pm Hst Wed Jul 18 2018
.small craft advisory in effect through Thursday afternoon...
Tonight..East winds to 25 knots. Wind waves 8 feet. SWell east 4 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 8 feet. SWell east 4 feet. Isolated showers.
Thursday night..Northeast winds 20 knots. Wind waves 6 feet. SWell southwest 3 feet.
Friday..Northeast winds 20 knots. Wind waves 5 feet. Isolated showers in the morning.
Friday night..Northeast winds 15 knots. Wind waves 5 feet.
Saturday..Northeast winds 20 knots. Wind waves 4 feet. South swell 3 feet in the afternoon. Isolated showers in the morning.
Saturday night..Northeast winds 20 knots. Wind waves 4 feet. South swell 3 feet.
Sunday..Northeast winds to 25 knots. Wind waves 5 feet. South swell 3 feet. Isolated showers.
Monday..Northeast winds to 25 knots. Wind waves 8 to 10 feet. South swell 3 feet. Scattered showers.
PHZ100 338 Pm Hst Wed Jul 18 2018
Synopsis for hawaiian coastal waters.. Broad high pressure far north of the islands will maintain breezy to locally strong trade winds. An area of low pressure passing south of the islands is expected to provide an additional boost to trade wind speeds through Thursday.

7 Day Forecast for Marine Location Near Kapalua, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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Fxhw60 phfo 190216
afdhfo
area forecast discussion
national weather service honolulu hi
416 pm hst Wed jul 18 2018

Synopsis
High pressure north of the state will drive breezy trade winds
into Thursday. A few windward showers will linger through the
night, but drier weather will spread across the islands through
Thursday. Winds will taper off to moderate breezes Thursday night
and continue through the weekend.

Discussion
Surface analysis depicts two 1033 mb highs about 1800 miles
northeast and northwest of honolulu. Meanwhile, a surface trough
is located about 500 miles south of honolulu and moving west. The
tight pressure gradient between these features is producing a
breezy trade wind pattern over the islands, which will continue
through Thursday as the trough weakens and moves away to the west.

Aloft, water vapor imagery depicts a narrow but strong midlevel
ridge sitting over the state maintaining stable atmospheric
conditions. An upper level trough to the northwest will drift
closer to kauai and keep areas of high clouds streaming overhead
tonight.

Radar shows much of the showers that moved in last night from the
passing surface trough to the south have dissipated, but a few
lingering showers remain across windward kauai this afternoon. 00z
soundings show increasingly stable but moist conditions over the
state this afternoon. Precipitable water (pw) of around 1.6 inches
was recorded at hilo and lihue with an elevated midlevel
inversion. Mimic-tpw satellite imagery depicts an incoming drier
airmass with estimated pw values below 1.4 inches about 50 miles
east of the big island moving steadily westward. This drier
airmass will push across the state tonight allowing for dry and
pleasant conditions that will continue over the next several
days.

Trades will weaken to moderate breezes Thursday night and continue
through the weekend. Passing mainly light showers will focus over
windward areas. Heading into early next week, the last couple of
gfs runs have come into much better agreement with the ECMWF in
keeping deeper moisture associated with the next westward moving
tropical disturbance suppressed mainly to the south of the state.

Therefore have lowered rain chances somewhat for Sunday and
Monday. Another wave of tropical moisture may approach the state
from the southeast by the middle of next week.

Aviation
Strong high pressure to the north of hawaii will keep breezy
trade winds in place through Thursday. Airmet tango for low-level
turbulence is in effect for turbulence below 8000 ft south and
west of mountains and should stay in place through Thursday.

Vfr conditions are expected through this period in most areas
except for small pockets of possible MVFR conditions on the
windward side of the mountains. With more moisture expected to
move across the big island, there is a better chance for MVFR
conditions and an airmet for mountain obscurations may eventually
be needed. Will monitor closely and update as necessary.

Marine
A surface trough is currently passing south of the state and is
causing locally fresh to strong trade winds. As a result, a small
craft advisory (sca) is in effect for the typical windy waters
around the big island and maui county and the waters around oahu.

Winds will decline a notch Thursday and Friday, and the SCA will
likely be scaled back to the typically windy waters through the
weekend.

Local pacioos buoys have recently been registering seas of 8 to 10
ft at 8 to 10 seconds. Thus, a high surf advisory (hsa) is in
effect for east facing shores through tonight. As winds decline
Thursday and Friday, east shore surf will drop back to seasonable
levels.

A series of reinforcing south and southwest swells will maintain
small to moderate surf along south facing shores across the state
through Friday. Slightly larger and longer period south-southwest
swells spreading across the state this weekend may cause surf to
approach the hsa threshold along south facing shores from Saturday
into Monday.

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

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

Small craft advisory until 6 pm hst Thursday for kaiwi channel-
maui county windward waters-maalaea bay-pailolo channel-
alenuihaha channel-big island leeward waters-big island
southeast waters.

Small craft advisory until 6 am hst Thursday for kauai channel-
oahu windward waters-oahu leeward waters-maui county leeward
waters.

Discussion... Foster
aviation... Chevalier
marine... Kino m ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi39 min 79°F9 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi45 min NE 19 G 26 78°F 81°F1016 hPa
51213 27 mi39 min 80°F4 ft
51202 - Mokapu Point, HI (098) 61 mi35 min 80°F9 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE14
G20
NE14
G20
NE15
G20
NE10
G15
NE17
G25
NE15
G20
NE13
G20
NE13
G19
NE8
G13
N11
NE19
G24
NE17
G21
NE15
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G20
NE14
G22
NE17
G25
NE17
G24
NE20
G28
NE21
G30
NE24
G31
NE21
G27
NE21
G26
NE21
G29
NE17
G22
1 day
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NE22
NE16
G22
NE15
G21
NE13
G18
NE17
G21
NE15
G20
NE13
G18
N11
NE14
G21
N12
NE16
G20
NE19
G24
NE14
G23
N16
G20
NE17
G22
NE20
G28
NE20
NE21
G27
NE19
G26
NE20
G27
NE19
G26
NE18
G24
NE20
NE19
G25
2 days
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NE1
N7
G13
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NE3
G10
NE18
G24
NE21
NE24
NE25
NE25
G31
NE27
G33
NE28
NE28
NE29
NE25
G31
NE25

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI1 mi3.4 hrsNE 14 G 2410.00 miMostly Cloudy with Haze81°F68°F66%1015.6 hPa
Kahului, Kahului Airport, HI14 mi75 minENE 14 G 2610.00 miPartly Cloudy79°F71°F77%1016.2 hPa
Lanai City, Lanai Airport, HI23 mi73 minNE 610.00 miOvercast75°F69°F82%1015.6 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE12------------------------NE8NE10
G18
NE9
G16
NE14NE12
G21
NE18
G29
NE19
G24
NE16
G26
E10
G21
NE15
G25
NE14
G24
1 day agoNE12
G20
------------------------NE11NE10
G17
NE15NE14NE12NE10
G18
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G23
NE14
G20
NE13
G25
NE13
G20
NE10
2 days agoE13------------------------NE15NE9NE14NE14
G22
NE14NE16
G25
NE15
G25
NE15
G24
NE16
G27
NE15
G22
NE17

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 03:08 AM HST     0.14 feet Low Tide
Thu -- 05:55 AM HST     Sunrise
Thu -- 09:53 AM HST     First Quarter
Thu -- 10:19 AM HST     1.61 feet High Tide
Thu -- 12:39 PM HST     Moonrise
Thu -- 03:54 PM HST     0.90 feet Low Tide
Thu -- 07:10 PM HST     Sunset
Thu -- 09:01 PM HST     1.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.50.20.10.20.40.711.31.51.61.61.51.31.10.90.911.11.21.41.41.41.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 02:11 AM HST     0.40 feet Low Tide
Thu -- 05:55 AM HST     Sunrise
Thu -- 08:53 AM HST     1.36 feet High Tide
Thu -- 09:53 AM HST     First Quarter
Thu -- 12:38 PM HST     Moonrise
Thu -- 01:25 PM HST     1.08 feet Low Tide
Thu -- 07:09 PM HST     Sunset
Thu -- 07:31 PM HST     1.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.50.40.40.60.811.21.31.41.31.21.11.11.11.21.31.51.61.71.71.61.41.1

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 (2,6,7,8)
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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.