Sunday, September23, 2018 L-36.com


Marine Weather and Tides
Maalaea, HI

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

Sunrise 6:14AMSunset 6:21PM Sunday September 23, 2018 3:22 PM HST (01:22 UTC) Moonrise 5:55PMMoonset 5:05AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 Am Hst Sun Sep 23 2018
Rest of today..North winds 10 knots. Wind waves 2 feet or less.
Tonight..North winds 10 knots. Wind waves 2 feet or less.
Monday..Northeast winds 10 knots veering southwest in the afternoon. Wind waves 2 feet or less.
Monday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Thursday..North winds 15 knots in the morning becoming variable less than 10 knots, then becoming north 15 knots. Wind waves 2 feet or less. Scattered showers.
PHZ100 930 Am Hst Sun Sep 23 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 then weaken and shift to the southeast today and become more southerly beginning Monday night.


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 231937
afdhfo
area forecast discussion
national weather service honolulu hi
937 am hst Sun sep 23 2018

Synopsis
Low pressure northwest of kauai will lift to the northeast over
the next couple of days, bringing a weakening cold front and
increasing moisture towards the western islands. Showers will
increase mainly over the western islands Monday night through
Tuesday. Weak, south winds and higher than normal dewpoints will
continue muggy conditions into the middle of the week.

Discussion
A 1001 mb low was analyzed about 775 miles northwest of kauai
overnight, with a surface trough extending to the south of the
low. This feature will be the focus of our weather over the next
few days. The analysis also showed a northeast to southwest
oriented ridge over kauai, which supports the light southeasterly
winds we are seeing spreading across the islands.

Dewpoints across the islands are in the upper 60s to low 70s, and
as winds weaken, this will begin to feel more uncomfortable.

Dewpoints are expected to hover around 70 into mid week, before
starting to climb into the low to mid 70s. This will continue to
make atmosphere feel muggy for several days.

The GFS remains the most aggressive with the trough or weakening
front moving near or over kauai Monday night and Tuesday. All the
models have slowed the increase in precipitable water (pw) since
yesterday morning, but all the models suggest pw reaching 2 inches
over kauai at times Monday night through Tuesday. Although 500 and
700 mb temperatures remain near normal, that increase in pw is
significantly above the 1.42 inches which is normal for lihue for
september, with 2 inches being about 2 standard deviations above
normal. While there have been some isolated thunderstorms noted
near the low over the last few days, it would appear that the
bulk of the instability will stay closer to the center. However
with the amount of pw moving over kauai, it won't be surprising to
have some locally heavy rainfall move overhead.

While the main focus of the moisture will be over kauai, other
areas will see an increase in pw as well, which will likely bring
an increase in showers to some areas.

The models are still in some disagreement with the handling of the
situation during the second half of the week. The GFS keeps some
lingering parts of the trough over the western end of the island
chain, which would prevent trade winds from building back in too
strongly. Meanwhile, the ECMWF has a stronger high build in behind
the trough, with more trade winds making their way back in. Will
continue to watch for better consensus before making any
significant changes to the grids in the long term.

Aviation
Winds will veer to the southeast across the state today as a low
pressure trough to the west slowly approaches the state, with
seabreezes developing across many areas this afternoon.

Clouds and passing showers will remain mostly confined to the
windward and mauka areas the rest of this morning, with
isolated brief MVFR conditions possible. Some clouds and a few
showers will form over interior leeward areas along the seabreezes
this afternoon. Otherwise,VFR conditions will prevail. The more
widespread clouds and showers associated with the trough are
expected to remain west of kauai through today.

No airmets are currently in effect, and none are anticipated
today.

Marine
An area of low pressure far northwest of kauai will continue to
move slowly northeast and east through the middle of the week.

Surface winds will then weaken and shift more southeasterly today
and become southerly by Monday night through Wednesday. This will
also bring an increase in showers, especially across the western
coastal waters throughout the week.

Surf will remain below advisory levels along all shores through the
middle of the week. Rough, short-period surf along east facing
shores will gradually decline throughout the work week as the
winds ease and shift. A north-northwest swell is expected late
this week, which may increase surf to near the advisory level
along north facing shores. Small, long-period southwest and south
swells will give surf along south facing shores a small boost
throughout the week, but remain well below advisory level.

Hfo watches warnings advisories
None.

Discussion... M ballard
aviation... Ts
marine... Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 8 mi41 min ENE 11 G 17 80°F 1009.7 hPa
51205 17 mi53 min 80°F6 ft
51213 28 mi53 min 83°F3 ft
51202 - Mokapu Point, HI (098) 78 mi53 min 81°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE12
G20
NE11
G18
NE14
G19
NE1
E7
NE8
G13
E4
G8
NE5
G9
NE4
N5
NE6
G10
NW11
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N6
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N5
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G16
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G18
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NE14
G21
NE16
NE9
G14
NE4
G9
E3
G7
E7
G11
NE15
G20
NE11
G18
NE7
G12
NE15
G19
NE13
G16
NE12
G19
NE12
G17
NE12
G19
NE12
G17
NE16
G20
NE11
G19
NE11
G15
NE13
G17
NE15
G20
NE14
G22
NE17
G21
NE16
G20
NE13
G18
2 days
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N5
G13
N9
G13
NE4
G10
N4
G8
NE3
G6
NE9
NE7
E3
G6
NW4
NW3
G7
NE5
NE1
G4
NE10
G14
NE9
G15
N7
G10
E1
NE6
G11
NE6
NE9
G13
NE15
NE12
G20
NE14
G18
N10
G30
NE14
G23

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi29 minNE 1210.00 miPartly Cloudy91°F73°F57%1009.8 hPa
Lahaina - West Maui, HI19 mi33 minVar 515.00 miA Few Clouds84°F71°F66%1010.2 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE13NE12NE6SE3E6NE8E6E4CalmW3SE8SE3SE7CalmSE5S3CalmCalmNW7NW6NE14NE15NE13NE12
1 day agoE12
G21
E10
G21
E9SE7E6E9NE12E11NE9NE11NE10E9NE12NE11E8NE14
G18
E11
G21
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G22
NE17
G21
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G23
E16
G25
NE18
G25
NE15
G22
E15
G21
2 days agoNE11NE8NE8SW4E5NE5NE5CalmE5CalmSE4SE3SE5----SE44Calm4NE14NE14NE16
G23
NE16
G19
NE14
G20

Tide / Current Tables for Kihei, Maui (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 Kahului, Kahului Harbor, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (21,6,7,8)
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Ground Weather Radar Station Kohala, 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.