Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Lahaina, 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 6:15AMSunset 6:18PM Tuesday September 26, 2017 1:09 AM HST (11:09 UTC) Moonrise 11:55AMMoonset 11:16PM Illumination 33% 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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PHZ119 Maalaea Bay- 930 Pm Hst Mon Sep 25 2017
Rest of tonight..Northeast winds 15 knots. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots becoming northeast 10 knots in the afternoon. Wind waves 2 feet or less.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Wednesday..North winds 20 knots veering east in the afternoon. Wind waves 2 feet or less.
Wednesday night..North winds 20 knots. Wind waves 2 feet or less.
Thursday..Northeast winds 20 knots. Wind waves 2 feet or less.
Thursday night..Northeast winds 20 knots. Wind waves 2 feet or less.
Friday..Northeast winds 20 knots becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Isolated showers.
PHZ100 930 Pm Hst Mon Sep 25 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the islands will strengthen in the next day or two resulting in a slight boost in the trades. Over the weekend...the trades will become light southerly as a front approaches the islands from the northwest.

7 Day Forecast for Marine Location Near Lahaina, HI
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location: 20.88, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 260657
afdhfo
area forecast discussion
national weather service honolulu hi
857 pm hst Mon sep 25 2017

Synopsis
A slow increase in the trades is expected over the next couple
days as a surface ridge to our north strengthens. The trades will
peak on Thursday at locally breezy levels. Some increase in trade
wind showers is expected Tuesday night through Wednesday night as
a band of moisture pushes across the islands. Our winds will shift
around to the southeast by the weekend as a cold front approaches
from the northwest. This will allow for daytime sea breezes and
overnight land breezes in most areas, along with bringing some vog
northward and into the smaller islands.

Discussion
Currently at the surface, a 1024 mb high is centered around 1700
miles northeast of honolulu, with a ridge axis extending
southwestward to a location around 250 miles north of kauai.

Meanwhile, a weakening trough of low pressure is located around
250 miles east of hilo. Infrared satellite imagery shows some
lingering clouds over leeward sections of the big island, with
mostly clear to partly cloudy skies across the remainder of the
state. Radar imagery shows a few light showers moving into
windward areas, with some lingering showers over leeward sections
of the big island as well. Main short term concerns revolve around
rain chances and the strengthening trades over the next few days.

Tonight through Friday night,
the weak surface trough to the east of the state will weaken as
it shifts westward, reaching windward sections of the big island
late Tuesday night. The trough will dissipate by the middle of the
week, but will send a band of deeper moisture westward across the
island chain Wednesday and Wednesday night, bringing an increase
in trade wind showers to the area. At the same time, the surface
ridge axis will lift northward over the next couple of days,
resulting in a gradual strengthening of the trade winds. Light to
moderate trade winds are expected through Wednesday, with the
trades then increasing to moderate and locally breezy levels
Wednesday night through Thursday night. The trades will then
begin to ease again by the end of the work week and heading into
the weekend as a cold front begins to approach from the northwest.

Clouds and showers will favor windward and mauka areas through
the period, with a stray shower reaching leeward areas from time
to time. Rainfall amounts should generally remain on the light
side.

Saturday through next Monday,
there remains a significant amount of uncertainty with respect to
the overall synoptic pattern evolution over the weekend into
early next week, with quite a bit of wavering in the model
solutions from run to run as well as significant differences
between the GFS and ecmwf. The big question is how far east the
cold front manages to move, with the GFS showing it possibly
reaching the western islands, while the ECMWF keeps it to the west
of the state. For now will follow the more optimistic and
consistent ECMWF solution, keeping the cold front and deeper
moisture associated with it, to the west of the island chain.

Overall, with the cold front approaching the islands from the
northwest, we should see a weakening of the trades, with the
winds also shifting around to a more southeasterly direction over
the weekend into early next week. This will likely allow for
overnight land breezes and daytime sea breezes across the island
chain, with showers most common over leeward and interior sections
of the islands during the afternoon and evening hours and near
the coast during the overnight and early morning hours.

Aviation
A cold front far to the north of hawaii will continue to weaken
the high pressure ridge producing light to moderate trade winds
over the islands through Wednesday. Localized sea breezes will
develop in some areas during the day with clouds ceilings
building over interior sections of each island. Localized land
breezes will clear out cloud cover in most areas. Large scale
stability across the region will limit any shower potential to
mostly isolated coverage over island interior and mountain
regions during the day and windward areas at night.

No airmets are currently in effect or anticipated.

Marine
Trades will remain below small craft advisory criteria through the
rest of the work week. There is a slight bump between Wednesday
night and Friday to moderate speeds, but not any higher as noted
in the previous discussion. This warrants closer attention,
however. Over the weekend, the trades are replaced by a light se
to S wind flow, as a front nears the NW limit of our offshore
waters. According to the latest GFS run, the front may advance
further into the NW coastal waters of kauai on Monday with light
southerly winds as the primary wind flow ahead of it. Light
northerly winds follow in behind the front if this solution pans
out.

A low level trough embedded in the trade wind flow, will pass
through the main hawaiian islands on Wednesday, adding a boost to
the trade showers. Also, the passage of the trough will bring a
slight bump in the trades to the area.

The spotty thunderstorm activity just outside the NE offshore
waters has ceased as the upper low has weakened.

Surf is expected to remain below advisory levels through the
forecast period. Surf along south facing shores will remain small
through the week with mainly a mix of background southeast and
southwest swells. The next long-period pulse out of the southwest
should fill in Tuesday night through midweek, leading to a slight
rise along the south facing shores. A small bump from the NW is
expected Tuesday night. It will gradually fade after Wednesday. A
more moderate size NW swell is slated to arrive next week Monday.

Forerunners from this swell should be showing up Sunday afternoon.

Surf along east facing shores will remain small through
Wednesday, a slight rise is expected on Thursday as the trades
strengthen slightly.

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Bohlin
marine... Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi57 min NNE 6 G 7 77°F 82°F1015.3 hPa
51205 17 mi60 min 81°F4 ft
51202 - Mokapu Point, HI (098) 65 mi35 min 81°F3 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI13 mi75 minNNE 510.00 miFair74°F68°F82%1015.9 hPa
Lanai City, Lanai Airport, HI16 mi73 minNNE 1010.00 miFair70°F66°F87%1015.2 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------E10NE5N6N10N11N13N12
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1 day ago------------------------56NE9NE13
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2 days ago------------------------NE7NE13N14N12NE14NE13NE14NE14N13
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Tue -- 12:27 AM HST     0.62 feet Low Tide
Tue -- 06:16 AM HST     Sunrise
Tue -- 08:17 AM HST     1.95 feet High Tide
Tue -- 11:54 AM HST     Moonrise
Tue -- 03:59 PM HST     0.81 feet Low Tide
Tue -- 06:18 PM HST     Sunset
Tue -- 08:15 PM HST     1.07 feet High Tide
Tue -- 11:15 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.60.70.91.21.41.71.91.91.91.81.61.41.110.80.80.90.911.11.110.9

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 06:15 AM HST     Sunrise
Tue -- 06:52 AM HST     1.85 feet High Tide
Tue -- 11:53 AM HST     Moonrise
Tue -- 01:48 PM HST     1.34 feet Low Tide
Tue -- 03:18 PM HST     1.34 feet High Tide
Tue -- 06:17 PM HST     Sunset
Tue -- 11:14 PM HST     Moonset
Tue -- 11:38 PM HST     0.56 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.70.91.21.51.71.81.91.81.71.61.51.41.31.31.31.31.31.21.10.90.80.70.6

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 (7,2,3,4)
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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.