Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Maalaea, 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 6:14AMSunset 6:18PM Tuesday September 26, 2017 4:30 AM HST (14:30 UTC) Moonrise 11:54AMMoonset 11:15PM Illumination 34% 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- 331 Am Hst Tue Sep 26 2017
Today..North winds 15 knots. Wind waves 2 feet or less.
Tonight..North winds 20 knots. Wind waves 2 feet or less.
Wednesday..North winds 15 knots. Wind waves 2 feet or less.
Wednesday night..North winds 20 knots. Wind waves 2 feet or less.
Thursday..North winds to 25 knots. Wind waves 2 feet or less.
Thursday night..North winds to 25 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Saturday..North winds 20 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. Haze. Isolated showers.
PHZ100 331 Am Hst Tue Sep 26 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 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 Maalaea, HI
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location: 20.78, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 261311
afdhfo
area forecast discussion
national weather service honolulu hi
311 am hst Tue sep 26 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 tonight 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 1900
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
200 miles east of hilo. Infrared satellite imagery shows clear to
partly cloudy skies in most areas, with some pockets of enhanced
cloud cover in windward areas as well as southern sections of the
big island near south point. Radar imagery shows a few light
showers drifting into windward areas, with generally rain free
conditions elsewhere. Main short term concerns revolve around
rain chances and the strengthening trades over the next few days.

Today 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 tonight. 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 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. Additionally, some
volcanic haze will likely work northward into the smaller islands
Saturday through early next week.

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 at night. 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
The trades are expected to strengthen Wednesday night and reach
small craft advisory criteria Thursday for some of the waters
around maui county and waters south of the big island. This boost
in the trades is brief as they will lower to below advisory level
on Friday. 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. At this time, the front is expected to stall some 350
miles northwest of kauai, or just outside of our offshore waters
northwest of kauai.

A weakening 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. This trough is currently 160 miles
east of the big island. The strengthening of the trades Wednesday
night coincide with the passage of this trough.

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. A small bump from the NW is expected tonight.

It will gradually fade after Wednesday. A 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 relatively small through the period, even with
the brief boost in the trades between Wednesday night and Friday.

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 8 mi48 min NW 4.1 G 6 77°F 82°F1014 hPa
51205 17 mi51 min 81°F3 ft
51202 - Mokapu Point, HI (098) 78 mi56 min 81°F3 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi36 minNE 410.00 miFair71°F66°F84%1014.5 hPa

Wind History from HOG (wind in knots)
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Last 24hrSE5SE6S3CalmN6N9N10N11N12NE12N11NE11N9NE7N6NE7NE4E5NE3NE5NE3NE3NE5NE5
1 day agoE5NW6N5N7N9N14NE13NE14N12NE14NE13NE12NE12N9NE9N9E5E4E5NE4N3E3SE3SE5
2 days agoNE5N4NE3NE11NE15NE16NE17NE16NE18NE17NE17NE16N14NE13NE10NE7NE5N6NE4N3N6NE4N4N5

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
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Tue -- 01:19 AM HST     0.45 feet Low Tide
Tue -- 06:15 AM HST     Sunrise
Tue -- 08:52 AM HST     2.06 feet High Tide
Tue -- 11:53 AM HST     Moonrise
Tue -- 03:26 PM HST     0.75 feet Low Tide
Tue -- 06:17 PM HST     Sunset
Tue -- 09:05 PM HST     1.17 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
0.60.50.50.70.91.31.61.822.121.71.41.10.90.80.80.80.911.11.21.11

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 (10,2,3,4)
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Ground Weather Radar Station Kohala, 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.