Monday, August21, 2017 L-36.com


Marine Weather and Tides
Lanai City, 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 6:06AMSunset 6:51PM Monday August 21, 2017 3:41 PM HST (01:41 UTC) Moonrise 6:07AMMoonset 7:10PM Illumination 0% Phase: New Moon; Moon at 29 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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PHZ118 Maui County Leeward Waters- 325 Pm Hst Mon Aug 21 2017
Tonight..East winds 20 knots. Wind waves 4 feet. Slight chance of Thunderstorms in the evening. Scattered heavy showers through the night.
Tuesday..Northeast winds 15 knots. Wind waves 5 feet. Scattered heavy showers in the morning, then isolated showers in the afternoon.
Tuesday night..Northeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Isolated showers in the morning.
Wednesday night..Northeast winds 15 knots. Wind waves 6 feet. SWell east 3 feet.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. SWell east 3 feet.
Thursday night..Northeast winds 15 knots. Wind waves 5 feet. SWell east 3 feet.
Friday..Northeast winds 15 knots. Wind waves 4 to 5 feet. SWell east 3 feet.
Saturday..East winds 10 knots. Wind waves 3 feet.
PHZ100 325 Pm Hst Mon Aug 21 2017
Synopsis for hawaiian coastal waters.. A weak cold front far to the north has weakened the subtropical ridge of high pressure. As the front moves east, high pressure will rebuild north of the area on Tuesday and strengthen the trade winds. An upper level low will produce unstable conditions over the western waters through Tuesday.

7 Day Forecast for Marine Location Near Lanai City, HI
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location: 20.78, -157     debug


Area Discussion for -
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Fxhw60 phfo 211948
afdhfo
area forecast discussion
national weather service honolulu hi
948 am hst Mon aug 21 2017

Synopsis
Trade winds will prevail through the week as a ridge remains to
our north. Tropical moisture overrunning the islands from the east
will maintain muggy conditions with enhanced showers through
Tuesday. Instability aloft will introduce a slight chance of
thunderstorms. Drier and windier conditions will return Wednesday
as the ridge strengthens to our north.

Discussion
Morning satellite, lightning, and radar data show moderate trade
showers moving into windward areas, along with and area of thunderstorms
about 100 miles northwest through north of kauai. The thunderstorms
are forming under an upper low that is moving slowly southward,
bringing cooler temperature aloft and instability to the
atmosphere. Showers are expected to increase statewide this
afternoon with land heating lending some extra oomph at the
surface to combine with the instability of the upper low. The
combination of the nearby upper low, afternoon land heating, and
enhanced low level moisture will bring the chance of thunderstorms
and locally heavy showers both this afternoon and possibly again
Tuesday afternoon. Overnight, showers will focus mainly over
windward slopes and mountain areas with passing showers over
leeward locations. The elevated low level moisture has brought
uncomfortable conditions with dew points in the low to mid 70's.

Muggy conditions will continue through Tuesday.

The upper level low will push southwest near kauai tonight and
Tuesday maintaining instability over the western islands. By
Wednesday, the low is expected to move farther west of kauai with
ridging building over the state from the east. A slight chance of
thunderstorms is possible mainly near kauai and oahu through
Tuesday. The possibility of afternoon upslope thunderstorms over
the big island will remain through Tuesday due to the elevated
terrain, enhanced low level moisture, and slight instability.

Outside of the thunderstorm threat, the general weather pattern
will consist of windward clouds and showers merging with
afternoon and evening leeward clouds and showers. By Wednesday,
the upper low will be far west of the islands, and the ridge to
the north is expected to rebound and drive stronger trade winds
across local waters. More stable conditions will prevail as
ridging aloft builds over the state.

Aviation
A ridge of high pressure north of the state will keep moderate
trade winds in place through tonight. Clouds and showers will
favor windward and mauka areas, but daytime heating will result in
showers across leeward areas as well. An unstable airmass over
the islands may also result in thunderstorms across portions of
the island chain this afternoon into early this evening. MVFR and
lower conditions will become more common as shower coverage and
intensity increases across the state this afternoon into this
evening. Otherwise, MVFR CIGS vsbys should remain primarily
confined to windward and mauka locales.

Airmet sierra remains in effect for mountain obscuration on the
island of oahu. Conditions should improve here later this
morning. This afternoon, mountain obscuration will likely become
an issue once again across portions of the state, and will issue
airmets as conditions develop.

Marine
A cold front far to the north of the hawaiian islands has weakened
the subtropical ridge of high pressure resulting in moderate trade
winds across the region. As the front moves eastward, high
pressure north of the state will strengthen and increase the trade
winds. The trades are expected to reach small craft advisory
criteria on Tuesday for the normally windier channels between the
islands and the coastal waters south of the big island.

The above-mentioned upper level low will continue to produce a
slight chance for thunderstorms over coastal and offshore waters
through Tuesday. The highest risk is for the waters in the west
half of the forecast area. More stable and drier conditions are
expected on Wednesday and through the second half of the week.

Surf is expected to remain small through the week. East-facing
shores should see a slight increase in surf heights as the trade
winds rebuild on Tuesday. A longer period east swell may also
arrive during the second half of the week as a result of tropical
cyclone activity in the eastern pacific. South-facing shores may
see a slight increase in surf this weekend from a swell train that
originated from a tasman sea gale. A small background southeast
swell is also expected through the forecast period.

Hfo watches warnings advisories
None.

Morrison... Discussion
kodama... Marine
jelsema... Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 29 mi41 min NE 11 G 20 80°F 82°F1014.7 hPa (-0.0)
51205 35 mi32 min 80°F5 ft
51202 - Mokapu Point, HI (098) 57 mi37 min 81°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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N16
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N15
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NE9
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NE5
G12
W3
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NE17
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NE1
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G8
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NW12
G16
N12
G16
NE14
G18
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G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI3 mi45 minNE 20 G 2410.00 miFair and Breezy82°F71°F69%1013.8 hPa

Wind History from HNY (wind in knots)
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Last 24hrNE16
G22
NE17
G22
SE6S6N53NE10NE10NE6NW4N6--NE8E5SE9E4CalmW6NW5SW7W4NW8NE16
G20
NE20
G24
1 day agoNE17NE16NE16NE13NE12NE8NE7NE7E3NE3N5NE6NE7NE10N8NE10NE11NE10
G14
NE8NE9NW6N17NE16NE18
G23
2 days agoNE18
G22
NE15
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S4NE11NE14NE12NE11NE8E7NE10NE14NE8NE10E7NE11E8
G16
NE16
G19
NE13
G16
NE11NE11
G21
S3NE12NE14
G21
NE17

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Mon -- 03:42 AM HST     1.38 feet High Tide
Mon -- 06:07 AM HST     Moonrise
Mon -- 06:09 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 09:20 AM HST     -0.09 feet Low Tide
Mon -- 04:12 PM HST     2.53 feet High Tide
Mon -- 06:52 PM HST     Sunset
Mon -- 07:09 PM HST     Moonset
Mon -- 10:56 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
0.40.71.11.31.41.20.90.50.1-0.1-00.20.71.31.92.32.52.42.11.610.50.20.1

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Mon -- 03:08 AM HST     1.42 feet High Tide
Mon -- 06:06 AM HST     Moonrise
Mon -- 06:07 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 08:38 AM HST     0.16 feet Low Tide
Mon -- 03:35 PM HST     2.54 feet High Tide
Mon -- 06:51 PM HST     Sunset
Mon -- 07:08 PM HST     Moonset
Mon -- 10:16 PM HST     0.27 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.11.31.41.41.10.80.40.20.20.40.71.31.82.22.52.52.31.91.30.80.50.30.3

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 (21,6,7,8)
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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.