Tuesday, September25, 2018 L-36.com


Marine Weather and Tides
Lanai City, HI

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9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:14AMSunset 6:19PM Tuesday September 25, 2018 3:19 AM HST (13:19 UTC) Moonrise 7:12PMMoonset 6:50AM Illumination 100% Phase: Full Moon; Moon at 15 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- 918 Pm Hst Mon Sep 24 2018
Rest of tonight..Southeast winds 10 knots. Wind waves 3 feet. Isolated showers.
Tuesday..Southeast winds 10 knots veering south in the afternoon. Wind waves 3 feet. Scattered showers.
Tuesday night..South winds 15 knots. Wind waves 3 feet. Scattered showers.
Wednesday..South winds 10 knots. Wind waves 4 feet. Scattered showers.
Wednesday night..South winds 10 knots. Wind waves 3 feet. Scattered showers.
Thursday..Northeast winds 10 knots backing north in the afternoon. Wind waves 3 feet in the morning then 2 feet or less. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..Northeast winds 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Isolated showers through the night.
Friday..Northeast winds 10 knots. Wind waves 3 feet. North swell 3 to 4 feet. Isolated showers.
Saturday..Northeast winds 15 knots. Wind waves 4 feet. North swell 4 to 5 feet.
PHZ100 918 Pm Hst Mon Sep 24 2018
Synopsis for hawaiian coastal waters.. An area of low pressure far northwest of kauai will gradually move northeast and east through the middle of the week. Surface winds will become more southerly tonight and an increase of locally heavy showers are expected through Tuesday night for the western coastal waters.


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 250630
afdhfo
area forecast discussion
national weather service honolulu hi
830 pm hst Mon sep 24 2018

Synopsis
Low pressure northwest of kauai will lift slowly northeast during
the next couple of days, dragging a trough toward the islands.

High moisture levels with southerly winds ahead of the trough will
bring frequent showers to kauai through Tuesday night, with heavy
rainfall possible. Muggy conditions are expected to continue
across the state through much of the week as the trough slowly
weakens. A more typical trade wind pattern may return by Thursday
night or Friday.

Discussion
Numerous showers continue over the coastal waters west and
southwest of kauai early this evening, however little rainfall has
occurred over kauai itself thus far. The heaviest rains during the
past few hours have actually occurred over the windward slopes of
haleakala and windward sections of the big island southwest of
hilo. Satellite imagery shows colder cloud tops over the offshore
waters to the south through west of kauai, with a line of
thunderstorms located about 180 miles west of barking sands at the
moment. Surface analysis depicts a 1005 mb low located about 650
miles northwest of kauai, with a trough extending southward from
the low. Southeast to south winds ahead of this trough are
bringing a muggy airmass northward over the state, with dewpoints
well into the 70s. Aloft, water vapor imagery also shows a cutoff
low several hundred miles northwest of kauai, while a ridge lies
over the eastern end of the state. The 00z lihue sounding showed a
moist airmass in place, with pw of 1.91 inches, although there
was still a significant inversion based near 6000 feet at that
time. The 00z hilo showed rather typical trade wind conditions,
with pw of 1.55 inches and a strong inversion at 7000 feet. Mimic-
tpw imagery depicts greater than 2 inch pw values moving over
kauai from the south, with lower pws of 1.5 to 1.7 inches from
oahu eastward through the big island.

Overnight and Tuesday, high moisture with pw values of 2 inches
or more will continue over kauai, possibly edging eastward into
the kauai channel, as the surface and upper troughs remain stalled
to our west. Models also show some mid-level ascent over kauai
during this time due to the proximity of the upper trough. Would
expect frequent showers, some heavy, along with a slight chance of
thunderstorms, and the flash flood watch will remain posted for
kauai and niihau. The remainder of the state will see a
continuation of southeast south background flow and a land sea
breeze pattern, with scattered showers possible over the islands,
especially in the afternoon.

Tuesday night, the high moisture edges slowly eastward into the
kauai channel and toward oahu, while the large-scale ascent
gradually lifts out to the north of the state along with the
upper trough. Some heavy downpours will remain possible over kauai
during this time, and will have to keep an eye on the eastward
progression of this activity as it may reach oahu.

Model guidance shows above normal moisture lingering over much of
the state from Wednesday through the remainder of the work week.

Heavy rains will be less likely, as the upper trough flattens out
to our north resulting in the loss of forcing over the islands.

Surface troughing also to our north will maintain light southerly
flow through at least Thursday, therefore expect warm and muggy
weather to continue. Trade winds may resume by Thursday night or
Friday as weak high pressure builds to our north, and a tropical
low pressure area possibly develops to our south. Longer range
guidance shows the tropical low developing further during the
upcoming weekend as it tracks off to the southwest and west of
the islands, with a drier airmass finally returning to the state.

Aviation
A nearly stationary surface trough to the west of kauai will keep
the low level surface flow weak and out of the southeast. Weak
flow will allow light sea breezes to predominate most areas in
the afternoon and early evening hours and light land breezes in
the late night and early morning hours.

The surface trough will also continue to draw moisture and
instability out of the south. Thickening clouds and persistent
shower activity over kauai tonight has necessitated the issuance
of airmet sierra for mountain obscuration. Conditions are expected
to persist through at least tomorrow afternoon. Slight chance of
thunderstorms or heavy downpours over kauai and its adjacent
waters both tonight and tomorrow.

Elsewhere, higher clouds moving in from the east will spread
across the remaining smaller islands by morning and the big island
Tuesday afternoon. Localized MVFR conditions are possible in
showers, otherwiseVFR conditions will prevail through Tuesday
evening.

Marine
Surface winds will become more southerly beginning tonight as a
trough approaches the western coastal waters. This will result in
increasing showers which may be locally heavy at times, and winds
veering more south to southwest Tuesday into Wednesday for the
western coastal waters. Elsewhere, southeast winds are expected to
persist with some scattered showers through the middle of the
week. A weak front is expected to move across the western coastal
waters late Wednesday into Thursday. High pressure will build
behind it and trade winds will return by the weekend.

A moderate north-northwest swell is expected Friday into the
weekend, but should remain just below advisory levels. Small to
moderate long-period southwest swell is expected later in the
week, which will hold into the weekend before easing.

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

Hfo watches warnings advisories
Flash flood watch through late Tuesday night for niihau-kauai.

Discussion... Jacobson
aviation... Bedal
marine... Gibbs powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 2 mi49 min 82°F3 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 29 mi37 min 76°F 1010.3 hPa
51205 35 mi49 min 80°F5 ft
51202 - Mokapu Point, HI (098) 57 mi19 min 80°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI3 mi23 minENE 810.00 miPartly Cloudy68°F64°F90%1010.6 hPa

Wind History from HNY (wind in knots)
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Last 24hrE8E9E10E9SE9SE9SE116S9W86NW8W7W5S3CalmE4E4E7E4E4E5SE7E8
1 day agoNE7NE10NE7E5E5S3W7W64W96W8W9W6NE10NE11NE8NE5E6SE7SE7SE5E6E8
2 days agoCalmNE5CalmNE7NE5CalmSE7E8
G14
3W9NW9NE13NE17NE15NE16NE14NE11NE12E6SE7NE4N8N6N8

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
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Weather Map and Satellite Images
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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 (9,2,3,4)
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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.