Tuesday, May22, 2018 L-36.com


Marine Weather and Tides
Kahului, 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 5:44AMSunset 7:00PM Tuesday May 22, 2018 9:22 AM HST (19:22 UTC) Moonrise 1:08PMMoonset 1:15AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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- 321 Am Hst Tue May 22 2018
.small craft advisory in effect through Friday afternoon...
Today..North winds to 25 knots. Wind waves 2 feet or less then 3 feet in the afternoon.
Tonight..Northeast winds to 25 knots. Wind waves 3 feet.
Wednesday..Northeast winds to 25 knots. Wind waves 3 feet.
Wednesday night..Northeast winds to 25 knots. Wind waves 3 feet.
Thursday..Northeast winds to 25 knots. Wind waves 3 feet.
Thursday night..Northeast winds to 25 knots. Wind waves 3 feet.
Friday..Northeast winds to 25 knots. Wind waves 3 feet.
Saturday..Northeast winds to 25 knots. Wind waves 3 feet.
PHZ100 321 Am Hst Tue May 22 2018
Synopsis for hawaiian coastal waters.. High pressure will shift slowly eastward well to the north of the state through the work week, keeping moderate to breezy trade winds in place across the coastal waters. The trades may trend down slightly over the weekend into early next week as high pressure weakens and shifts northeastward further away from the island chain.

7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 221328
afdhfo
area forecast discussion
national weather service honolulu hi
328 am hst Tue may 22 2018

Synopsis
Locally breezy trade winds will persist across the state this
week. The low-level trade wind flow will continue to transport
low clouds and brief showers over windward and mauka sections of
the island chain.

Discussion
A 1031 mb surface high is centered near 37n 166w, or more 1100
miles north-northwest of lihue. Elsewhere, the leading edge of a
band of broken to overcast low clouds and showers associated with
a weakening surface front is about 440 miles north of lihue. The
surface high is pushing this front toward the east-southeast at
about 10 mph. The tightening pressure gradient south the high
is producing locally breezy trade winds across the state early
this morning. Evidence for this included an ascat pass over the
western and central islands several hours ago, which showed a
wide spread area of 20 to 25 mph winds over the ocean adjacent to
the state.

Loops of water vapor imagery indicate the islands are sandwiched
between a weak upper-level ridge to the east and an upper-level
low and trough to the west. The southwesterly flow aloft between
these systems is transporting patches of cirrus rapidly across
most of the smaller islands. The atmosphere remains relatively
stable over the region. Satellite derived precipitable water (pw)
values are near normal across must of the smaller islands from
oahu to maui county, while the pw appears to be slightly higher
in the vicinity of kauai and the big island. Satellite imagery
shows broken low clouds along windward sections of most islands.

Radar indicates scattered showers are embedded within the clouds
near the eastern and southeastern big island, while isolated
light showers are evident near and upstream of windward oahu,
molokai and maui.

The forecast guidance shows the surface front will continue to
weaken as it shifts toward the east-southeast today. At the same
time, the surface high will build northwest and north of the
state, where it will dominate our weather through the remainder of
the week. As a result, the locally breezy trade winds will likely
persist through the end of this week.

The models show there may be a slight increase in pw starting
Wednesday. This may provide for somewhat wetter conditions across
windward and mauka areas starting around mid-week. However, a
weak mid-tropospheric ridge is forecast to be above the islands
around this same time, so no heavy rainfall is expected.

Note that both the GFS and ECMWF models appear to show remnant
moisture from the front, which was described above, may
eventually be carried toward the state some time this weekend.

This may cause another slight increase in low clouds and showers
over some windward and mauka sections starting late Saturday
or Sunday.

A special weather statement remains posted for the kau district
on the big island due to intermittent volcanic ash emissions at
the halemaumau kilauea crater. At least one of these episodes
occurred shortly before sunset Monday evening, with an ash cloud
detected several thousand feet above the crater. Close monitoring
of the volcano on the big island will continue, since scientists
at the hawaii volcano observatory indicate that additional steam-
driven explosions may occur at any time, and with no advance
warning. Ashfall advisories or warnings will be issued if
necessary.

Aviation
High pressure north of the area will maintain locally strong trade
winds for the next few days. Airmet tango for low level
turbulence is posted over and immediately south through west of
the mountains. Trade winds will help focus scattered showers along
the windward and mountain areas. Expect conditions to remain
widelyVFR, with brief periods of MVFR is passing showers.

Conditions are not expected to be widespread enough to warrant the
need for mountain obscurations.

Periodic explosive eruptions at kilauea halemaumau crater
continue to produce periods of volcanic ash, with the plume of
emissions predominately rising to the inversion level, between
8-10 kft and extending to the southwest over kau district on the
big island. MVFR vis should be expected in this area. Volcanic
ash sigmet tango series remains in place at this time.

Marine
High pressure will shift slowly eastward well to the north of the
state through the work week, keeping moderate to breezy trade
winds in place across the coastal waters. The trades may trend
down slightly over the weekend into early next week as high
pressure weakens and shifts northeastward and further away from
the island chain. A small craft advisory (sca) remains in effect
for the typically windy waters around maui county and the big
island through Friday, and this SCA may need to be extended into
the upcoming weekend. The trades are expected to peak tonight and
Wednesday, so a SCA has been issued for the kauai and kaiwi
channels during this time as well.

Surf is expected to remain below advisory levels across all
shores through early next week.

A new small to moderate south to southwest (200-210 deg) is
expected to begin filling in through the day Wednesday, then hold
through Friday before lowering into the upcoming weekend.

Small northwest swells will continue through the upcoming
weekend, with a slight bump in surf heights expected on
Wednesday.

Small to low end moderate surf will remain rough and hold in
place along east facing shores through the upcoming weekend.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Friday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Small craft advisory from 6 pm this evening to 6 pm hst
Wednesday for kauai channel-kaiwi channel.

Discussion... Houston
aviation... Eaton
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi52 min ENE 15 G 20 76°F 78°F1017.9 hPa
51205 8 mi52 min 77°F6 ft
51202 - Mokapu Point, HI (098) 73 mi48 min 77°F7 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
G23
NE13
G23
NE11
G21
NE14
G24
NE12
G23
NE17
G23
NE16
G23
NE11
G21
NE16
G22
NE17
G23
NE19
NE15
NE13
G17
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G16
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G16
NE11
G16
NE14
G18
NE15
NE15
G22
NE13
G21
NE13
G18
NE18
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G21
1 day
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NE14
G20
NE12
G18
NE12
G17
N12
G15
NE15
G19
NE15
G20
N12
G15
N11
G14
NE10
G13
NE8
G14
NE10
G13
N8
N9
N8
N10
G13
NE11
G15
NE9
G16
NE10
G15
NE13
G17
NE12
G15
NE9
G12
NE12
NE10
G19
NE15
G19
2 days
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NE16
G21
NE18
G23
NE17
G25
NE18
G23
NE18
G23
NE20
G27
NE20
G27
NE22
G30
NE21
G29
NE17
G24
NE17
G21
NE20
NE18
NE13
G20
NE12
G20
NE15
G22
NE15
G19
NE16
NE14
G20
NE11
G18
NE13
G17
NE12
G18
NE12
G20
NE13
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi28 minNE 1710.00 miPartly Cloudy77°F69°F77%1018.4 hPa
Lahaina - West Maui, HI12 mi32 minNE 17 G 2315.00 miPartly Cloudy77°F66°F69%1017.9 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE19
G26
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NE14
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NE12NE9NE9NE9NE11NE8NE5E7E6NE11NE12
G17
NE11NE17
1 day agoNE20
G24
NE21NE19
G25
NE16NE15
G28
NE15NE16NE12E12
G21
NE11NE13
G18
NE11
G16
NE10NE10NE11NE12NE8NE10NE14NE11NE9NE12NE10
G19
NE17
G23
2 days agoNE14
G23
NE22
G31
NE24
G30
NE25
G30
NE25
G32
NE26
G34
NE20
G31
NE19
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G33
NE19
G27
NE15
G23
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NE13
G19
NE12NE14
G19
NE11NE10
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NE11
G20
NE11
G17
NE14
G19
NE15
G21

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 01:15 AM HST     Moonset
Tue -- 04:38 AM HST     0.44 feet Low Tide
Tue -- 05:45 AM HST     Sunrise
Tue -- 09:55 AM HST     0.91 feet High Tide
Tue -- 01:07 PM HST     Moonrise
Tue -- 02:33 PM HST     0.58 feet Low Tide
Tue -- 06:59 PM HST     Sunset
Tue -- 09:52 PM HST     1.98 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.10.80.60.50.50.50.70.80.90.90.90.80.70.60.60.70.91.21.51.71.921.9

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Tue -- 01:15 AM HST     Moonset
Tue -- 05:00 AM HST     -0.02 feet Low Tide
Tue -- 05:46 AM HST     Sunrise
Tue -- 11:25 AM HST     1.23 feet High Tide
Tue -- 01:07 PM HST     Moonrise
Tue -- 04:12 PM HST     0.50 feet Low Tide
Tue -- 06:59 PM HST     Sunset
Tue -- 11:01 PM HST     1.91 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.20.70.30.1-00.10.20.50.81.11.21.210.80.60.50.50.711.31.61.81.9

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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Wind Forecast for (15,3,4,5)
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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.