Thursday, July27, 2017 L-36.com


Marine Weather and Tides
Launiupoko, 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 5:57AMSunset 7:07PM Thursday July 27, 2017 2:51 PM HST (00:51 UTC) Moonrise 10:16AMMoonset 10:40PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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- 938 Am Hst Thu Jul 27 2017
.small craft advisory in effect through late this afternoon...
Rest of today..North winds to 25 knots. Wind waves 3 feet late in the morning then 2 feet or less.
Tonight..North winds 20 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less. Scattered showers in the afternoon.
Friday night..Northeast winds 20 knots. Wind waves 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Saturday..Northeast winds to 25 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Saturday night..Northeast winds to 25 knots. Wind waves 2 feet or less. Isolated showers after midnight.
Sunday..Northeast winds to 25 knots. Wind waves 2 feet or less.
Monday..Northeast winds 20 knots. Wind waves 2 feet or less.
PHZ100 938 Am Hst Thu Jul 27 2017
Synopsis for hawaiian coastal waters.. High pressure far northeast of the area will maintain moderate to locally breezy east trade winds through the period.

7 Day Forecast for Marine Location Near Launiupoko, HI
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location: 20.85, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 271957
afdhfo
area forecast discussion
national weather service honolulu hi
957 am hst Thu jul 27 2017

Synopsis
Trade winds will continue to fan the islands for at least the next
week, bringing a few brief showers to windward slopes and coasts
today. From late tonight through Saturday, moisture associated with
the remnants of greg is expected to bring increased humidity, while
also fueling an increase in showers, some of which may be heavy on
Friday. Most of the showers will affect windward areas, but a few
will stray leeward on the smaller islands, while leeward big island
slopes could see a few afternoon downpours. A trend toward drier
trade wind weather is expected from Sunday into early next week.

Discussion
Currently, moderate to fresh trade winds are being supported by
surface high pressure centered about 1400 miles northeast of the
islands. The center of the surface trough from ex-tropical
cyclone greg is estimated to be about 600 miles east of the big
island, and mimic total precipitable water (pw) imagery shows that
an associated area of increased pw (2-2.3 inches) extends from
17n to 22n between 153w and 138w, with additonal moisture trailing
se from greg. Water vapor imagery highlights a closed low aloft
centered about 500 miles northwest of kauai, and a ridge aloft
centered about 700 miles south southeast of the big island. The
resultant southwest flow aloft is advecting some high level
cloudiness toward the islands. Early morning soundings indicate
modest instability CAPE in the mid and upper levels of the island
atmosphere, with a strong low level subsidence inversion based
around 6000-8000 feet keeping a cap on the incoming low clouds.

A relatively quiet trade wind weather pattern is expected into
tonight, with a few showers gracing windward slopes and coasts, with
showery low clouds currently in greater concentration upstream of
maui and the big island. An isolated heavy shower developed over the
leeward slopes of mauna kea yesterday afternoon, and a repeat
performance is possible Friday and Saturday afternoons, but the
current sounding doesn't support their development today. High
clouds are expected to pepper skies over the big island and portions
of maui county today before the bulk of this moisture aloft slides
east of the area tonight and Friday.

Low to mid-level moisture associated with the remnants of greg
will begin streaming over the islands from the east later
tonight, bringing an increase in humidity as dew points climb into
the lower 70's, and fueling an increase in trade wind showers.

Some of the showers may be briefly heavy on Friday and Friday
night as the upper low northwest of kauai opens up to a trough,
and passes over the island chain. A significant reduction of mid-
level temperatures is not expected at this time, but the abundance
of low-level moisture may be sufficient to help fuel a few heavy
showers, and they have been added to the forecast with the latest
forecast package. With trade winds continuing, showers will focus
over windward slopes and coasts, and these are the areas most
likely to see a briefly heavy downpour, aside from leeward big
island slopes. With trade winds keeping most showers on the move,
and with relatively warm mid-levels, the idea of a flash flood
watch was rejected.

Gfs continues to keep this moisture over windward big island and
maui into Sunday while the ECMWF indicates a state-wide drying
trend on Sunday. With the trough aloft expected to have moved east
of the islands by Sunday, the ECMWF solution is favored at this
time. A ridge aloft building over the islands early next week
should support a drier than normal trade wind pattern, but
windward areas will likely still receive a few brief showers. With
respect to trade wind speeds, some slight reduction to the
locally breezy conditions is expected over the next day or so, and
a slight increase is possible late in the weekend as the trough
marking the remnants of greg passes south of the islands.

Aviation
Vfr conditions will prevail at all TAF sites today, though passing
low clouds embedded in the trade winds will bring brief MVFR
conditions to windward and mountain areas.

Airmet tango remains in effect for moderate low level turbulence
over and south through west of all mountains below 8000 feet.

Marine
High pressure north of the islands will maintain moderate to
locally breezy trade winds over the next several days. A small
craft advisory (sca) is posted for the typically windier waters
around the big island and maui through this afternoon. Winds are
expected to drop just below SCA levels tonight and Friday, but
could pick up to SCA levels again this weekend.

A distant typhoon in the west pacific is expected to send a small
mid to long period west swell towards the islands Friday into the
weekend. However, niihau and kauai will help effectively block
several areas on the remaining smaller islands from this swell.

Another round of distant east pacific tropical cyclones could send a
series of mid to long period east swells to the islands late
Saturday into midweek. This will need to be monitored over the next
several days for more specific details on timing and height, and
if a high surf advisory will be needed.

Otherwise, the locally breezy trade winds will keep rough choppy
surf along the east facing shores. A series of small south,
southeast, and southwest swells will produce small background surf
through the period.

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

Discussion... Foster
aviation... Powell
marine... Eaton


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi52 min NNE 13 G 16 79°F 82°F1016.1 hPa (-1.3)
51205 18 mi43 min 80°F5 ft
51202 - Mokapu Point, HI (098) 66 mi48 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Last
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NE17
NE15
G20
NE13
G17
NE16
NE13
G18
NE15
G19
NE14
G17
NE9
G12
NE8
G14
NE6
G9
NE11
G15
NE10
G16
NE10
G13
NE11
G17
NE8
NE5
N6
E10
G14
NE5
G8
NE10
G13
NE11
G16
NE14
NE14
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N13
G16
1 day
ago
NE17
G25
NE18
G25
NE19
G24
NE15
G25
NE17
G24
NE16
G23
NE16
G21
NE13
G19
NE18
G24
NE11
G16
NE11
G19
NE12
G17
NE13
G19
NE17
G23
NE16
G20
N14
G18
NE13
G17
NE11
G17
NE11
G15
NE11
G17
NE13
G18
NE13
G19
NE15
G21
NE16
2 days
ago
NE15
G19
NE6
NE14
G18
NE16
NE17
G22
NE12
G16
NE14
G19
NE12
G17
NE13
G18
NE9
G12
NE8
G12
NE10
G13
NE5
G8
NE13
G17
NE11
G14
NE8
G13
E8
G17
NE13
G18
NE12
G18
NE18
G23
NE18
G24
NE18
G25
NE22
NE18
G23

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi62 minNE 15 G 2015.00 miPartly Cloudy86°F64°F49%1016.3 hPa
Kahului, Kahului Airport, HI14 mi58 minNNE 2010.00 miPartly Cloudy and Breezy86°F69°F57%1016.2 hPa
Lanai City, Lanai Airport, HI15 mi56 minNE 12 G 1710.00 miFair82°F64°F56%1015.2 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE17
G25
NE15
G25
----------------------------N9NE13
G18
NE15
G21
NE16
G20
NE13
G19
NE14
G19
NE14
G22
NE15
G20
1 day agoNE15
G24
NE18NE17
G24
NE16------------------------NE12NE15NE15NE15NE12
G20
NE20NE15
G24
NE15
G25
2 days agoNW5E10E8Calm------------------------NE15N8NE12E15NE12
G20
NE15
G20
NE15
G23
NE18

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 12:58 AM HST     0.22 feet Low Tide
Thu -- 05:59 AM HST     Sunrise
Thu -- 07:01 AM HST     1.34 feet High Tide
Thu -- 10:15 AM HST     Moonrise
Thu -- 12:06 PM HST     0.61 feet Low Tide
Thu -- 06:41 PM HST     1.93 feet High Tide
Thu -- 07:07 PM HST     Sunset
Thu -- 10:40 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.20.30.50.81.11.31.31.31.10.90.70.60.70.81.11.41.71.91.91.81.51.20.8

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 04:59 AM HST     1.43 feet High Tide
Thu -- 05:58 AM HST     Sunrise
Thu -- 10:14 AM HST     Moonrise
Thu -- 10:42 AM HST     0.35 feet Low Tide
Thu -- 05:33 PM HST     2.21 feet High Tide
Thu -- 07:06 PM HST     Sunset
Thu -- 10:39 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.70.91.21.41.41.31.10.90.60.40.40.50.81.21.622.22.221.71.30.90.7

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 (20,4,5,8)
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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.