Wednesday, August23, 2017 L-36.com


Marine Weather and Tides
Makena, 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 6:50PM Tuesday August 22, 2017 10:19 PM HST (08:19 UTC) Moonrise 7:05AMMoonset 7:53PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 943 Pm Hst Tue Aug 22 2017
.small craft advisory in effect through Thursday afternoon...
Rest of tonight..North winds to 25 knots. Wind waves 3 feet.
Wednesday..North winds to 25 knots. Wind waves 3 feet.
Wednesday night..North winds to 25 knots. Wind waves 3 feet.
Thursday..North winds to 25 knots. Wind waves 3 feet.
Thursday night..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds to 25 knots. Wind waves 3 feet.
Friday night..North winds to 25 knots. Wind waves 3 feet.
Saturday..North winds 20 knots. Wind waves 2 feet or less.
Sunday..North winds 20 knots. Wind waves 2 feet or less.
PHZ100 943 Pm Hst Tue Aug 22 2017
Synopsis for hawaiian coastal waters.. Trade winds will be moderate to breezy across the area as high pressure strengthens north of the islands.

7 Day Forecast for Marine Location Near Makena, HI
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location: 20.6, -156.6     debug


Area Discussion for -
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Fxhw60 phfo 230604
afdhfo
area forecast discussion
national weather service honolulu hi
804 pm hst Tue aug 22 2017

Synopsis
A drier and more stable airmass has built into the island chain
this evening and will remain in place through the remainder of the
work week and into the upcoming weekend. Tropical moisture and
muggy conditions may return Sunday through early next week. Clouds
and showers will favor windward and mauka areas through the
period, with a stray shower spilling into leeward areas from time
to time. Moderate to breezy trade winds will continue through the
remainder of the work week, with the trades then easing over the
weekend into early next week as high pressure weakens to the north
of the state.

Discussion
Currently at the surface, a 1026 mb high is centered around 1200
miles northeast of honolulu, with another 1030 mb high around 1300
miles north of kauai. Meanwhile aloft, the upper level low which
resulted in the unstable conditions over the last few days, is now
around 400 miles west of kauai and is shifting westward and
further away from the state. A drier and more stable airmass is
building into the island chain from the east, and this has
resulted in a notable decrease in shower activity across the
islands. Radar imagery shows a few showers affecting windward
areas, with coverage highest over kauai where moisture remains a
bit deeper and the airmass less stable. Meanwhile, infrared
satellite imagery shows partly to mostly cloudy skies in place
across the state. Main short term concerns revolve around rain
chances and the increasing trades over the next few days.

Tonight through Saturday,
the two areas of high pressure will merge and settle southward
closer to the islands over the next couple of days, increasing the
trade winds across the state. Moderate to breezy trade winds are
expected through the remainder of the work week due to the tighter
pressure gradient across the state, with the peak in the trades
expected on Thursday. We should then see the trades ease to
moderate levels on Saturday, as high pressure weakens north of
the island chain.

As for sensible weather details, a drier airmass will continue to
build over the islands tonight, with these drier than normal
conditions then expected to remain in place through Saturday.

Clouds and showers will favor windward and mauka areas through the
period, with a stray shower reaching leeward areas from time to
time due to the strength of the trades. Showers are expected to be
most prevalent during the overnight and early morning hours.

Saturday night through next Tuesday,
the high pressure ridge north of the islands as a weakening front
passes by well to the north of the state. This will weaken the
trades into the light to locally moderate range Sunday through
early next week. Both the GFS and ECMWF show some deeper tropical
moisture trying to lift northward into the area Sunday through
early next week, and this may result in an increase in trade winds
showers across the island chain. In addition to the increase in
showers, muggy conditions will likely make a return as well, with
both models showing dewpoints climbing back into the lower 70s.

Aviation
A strong high pressure center well north of hawaii will produce
moderate to locally breezy easterly trade winds over the islands.

Scattered shower activity will continue into the morning hours
with prevailingVFR conditions. Brief periods of MVFR conditions
in showers are possible tonight and Wednesday morning along
northeastern slopes of all islands potentially affecting hilo and
lihue terminals. Drier air will filter into the islands from the
northeast on Wednesday with a reduction in shower activity
statewide through the rest of the week.

Airmet tango for low level mechanical turbulence remains in
effect.

Marine
A small craft advisory (sca) remains posted this evening for the
windier zones around maui and waters south of the big island. This
sca is good through Thursday afternoon, but there is a strong
possibility that it will be extended into the weekend.

The warm muggy air mass continues to exit the islands, and the
upper level low near kauai that helped set off a few
thunderstorms across the region, continues to drift further away
from the islands. There is a slight chance of a thunderstorm over
the western offshore waters west of kauai tonight, and this threat
should be over with by Wednesday afternoon.

With the trades on the strengthening trend, the surf on the east
facing side will see a slight bump on Wednesday. A longer period
east swell may also arrive during this second half of the week as
a result of tropical cyclone activity in the eastern pacific.

A swell from the tasman sea, generated by a gale about a week
ago, is due to arrive Friday afternoon. This swell and a southeast
swell will maintain some level of small surf along the south
facing shores into the weekend and beyond.

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

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 22 mi50 min N 8.9 G 9.9 80°F 82°F1017.3 hPa
51205 30 mi71 min 80°F6 ft
51202 - Mokapu Point, HI (098) 80 mi46 min 81°F6 ft

Wind History for Kahului, Kahului Harbor, HI
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Last
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N10
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NW10
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G20

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI22 mi24 minE 610.00 miA Few Clouds73°F66°F81%1016.9 hPa
Kahului, Kahului Airport, HI23 mi26 minNE 910.00 miFair79°F64°F62%1017.4 hPa

Wind History from HNY (wind in knots)
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Last 24hrNE11E4NE5N7NE13NE12NE10NE8E6E5NE6NE133NE6SW6NW9N7E7N12NE13NE11NE10NE8E6
1 day agoNE10NE6NW4N6--NE8E5SE9E4CalmW6NW5SW7W4NW8NE16
G20
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NE18NE13E9NE8NE17NE13
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2 days agoNE7E3NE3N5NE6NE7NE10N8NE10NE11NE10
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G23
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G22
SE6S6N53NE10

Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
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Kuheia Bay
Click for Map
Wed -- 05:01 AM HST     1.56 feet High Tide
Wed -- 06:07 AM HST     Sunrise
Wed -- 08:01 AM HST     Moonrise
Wed -- 10:42 AM HST     0.15 feet Low Tide
Wed -- 05:14 PM HST     2.20 feet High Tide
Wed -- 06:49 PM HST     Sunset
Wed -- 08:34 PM HST     Moonset
Wed -- 11:50 PM HST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.40.81.21.51.61.51.20.80.50.20.20.30.71.21.622.22.11.81.40.90.50.2

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Wed -- 05:12 AM HST     1.64 feet High Tide
Wed -- 06:07 AM HST     Sunrise
Wed -- 08:01 AM HST     Moonrise
Wed -- 10:39 AM HST     0.24 feet Low Tide
Wed -- 05:25 PM HST     2.27 feet High Tide
Wed -- 06:49 PM HST     Sunset
Wed -- 08:33 PM HST     Moonset
Wed -- 11:41 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.91.21.51.61.61.30.90.50.30.30.40.81.21.72.12.32.221.510.50.3

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 (4,6,7,8)
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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.