Tuesday, June27, 2017 L-36.com


Marine Weather and Tides
Kahului, 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 5:46AMSunset 7:12PM Tuesday June 27, 2017 12:22 AM HST (10:22 UTC) Moonrise 9:40AMMoonset 10:42PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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- 1003 Pm Hst Mon Jun 26 2017
.small craft advisory in effect through Thursday afternoon...
Rest of tonight..North winds to 25 knots. Wind waves 2 feet or less.
Tuesday..North winds to 25 knots. Wind waves 2 feet or less.
Tuesday night..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 2 feet or less.
Saturday..North winds 20 knots. Wind waves 5 feet. Isolated showers.
PHZ100 1003 Pm Hst Mon Jun 26 2017
Synopsis for hawaiian coastal waters.. A surface high far north-northeast of the state will maintain moderate to locally strong trade winds this week.

7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 270634
afdhfo
area forecast discussion
national weather service honolulu hi
834 pm hst Mon jun 26 2017

Synopsis
A trade wind weather pattern can be expected over the next
several days as high pressure remains far to the north northeast
of the area. Clouds and passing light showers will favor windward
and mauka areas with most leeward locations remaining dry. An
upper low is forecast to pass westward just north of the area late
in the work week and over the upcoming weekend, bringing a more
showery trade wind pattern to the island chain.

Discussion
Currently at the surface, a 1030 mb high centered 1800 miles
north-northeast of honolulu, is driving moderate to locally breezy
trade winds across the island chain this evening. Infrared
satellite imagery shows partly to mostly cloudy skies in place
across the state, with cloud cover most prevalent in windward
areas. Additionally, there is some jet stream cirrus enhancing
upper level cloud cover over the central islands as well. Radar
imagery shows some light showers moving into windward areas, with
rain free conditions elsewhere. Main short term concern revolves
around rain chances.

Tonight through Friday,
a ridge of high pressure will remain to the north and northeast of
the state through the period, keeping a breezy trade wind flow in
place across the island chain. The airmass will remain quite dry
through Thursday, with precipitable water (pw) values remaining
in the 1.0 to 1.2 inch range. Pw values will then climb slight
above normal levels in the 1.3 to 1.5 inch range Thursday night
and Friday, as an upper level low approaches from the east. As a
result, we expect a dry trade wind shower pattern through
Thursday, with showers limited primarily to windward and mauka
areas. The trade showers should increase in coverage and intensity
Thursday night and Friday as the airmass moistens up and becomes
less stable.

Friday night through next Monday,
the GFS and ECMWF both show the trade winds weakening over the
weekend as weak surface troughing develops over the islands in
response to an upper level low north of the state. The trades are
then expected to strengthen early next week as the surface
troughing over the islands breaks down.

Aloft, the model solutions start in fairly good agreement Friday
night, but then diverge with respect to the handling of the upper
level low over the weekend. The GFS pivots the upper low north of
the islands Friday night through Saturday night, with the feature
then stalling out through early next week with a trailing upper
trough lingering over the state. The ECMWF on the other hand,
lifts the upper level low north of the islands Friday night and
Saturday, with the feature then shifting northwest and away from
the islands Saturday night through early next week as upper level
ridging builds in from the east.

Given the model differences, will continue to favor a blended
forecast approach until the details become more clear. As a
result, we expect a fairly moist and somewhat unstable pattern
will keep a showery trade wind regime in place through at least
Saturday night. We will then show a more typical trade wind
weather pattern Sunday through early next week, but this could be
wetter if the GFS is correct or drier if the ECMWF ends up panning
out. Showers will continue to favor windward and mauka areas
through the period, with some afternoon evening shower development
likely over interior and leeward areas Saturday and Sunday
afternoon, in the weakened trade wind regime.

Aviation
The high pressure ridge north of the hawaiian islands will
produce moderate to breezy northeast to east trade winds. Airmet
tango is in effect for tempo low level moderate turbulence south
through west of mountains.

Tempo cloud ceilings and showers will move over mountain areas
and across north through east sections of all islands with
isolated showers forecast elsewhere. Brief mountain obscurations
are possible along windward mountain slopes and coasts.

Marine
A small craft advisory (sca) remains in effect due to strong
trade winds over the typically windy waters adjacent to the big
island and the islands of maui county. The sca, which is
currently in effect through Thursday, may need to be expanded to
include the maui county windward waters and the kaiwi channel by
mid-week. The latest forecast keeps SCA conditions over the
typically windy areas through Friday, followed by slightly weaker
trade winds this weekend.

The locally strong trades combined with a small northeast swell
generated by a fetch of gales west of oregon and california, will
produce slightly elevated choppy surf along east facing shores
during most of this week. However, surf is expected to remain
below the high surf advisory criteria along east facing shores.

Some of the northeast swell energy will also likely wrap into
exposed north facing shores across the state into mid-week. A
small short-period northwest swell (2 ft, 10 sec) is forecast for
Friday and Saturday.

Small pulses of swell energy from the southeast through southwest
will continue to produce near normal summertime surf along south
facing shores into mid-week. Reinforcing long-period south-
southwest and southwest swells will result in a slight bump in
surf heights along south facing shores from Thursday into this
weekend.

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... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi53 min NNE 16 G 22 78°F 80°F1018.7 hPa
51205 8 mi44 min 79°F6 ft
51202 - Mokapu Point, HI (098) 73 mi49 min 80°F7 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi29 minENE 710.00 miA Few Clouds77°F69°F77%1018.8 hPa

Wind History from HOG (wind in knots)
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Last 24hrCalmNE9SE5E6S6CalmCalmNE4E12
G17
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G30
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G26
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1 day agoSE5E6SE5SE6CalmS53Calm--NE16NE19NE18NE17
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W13W13--E5NE5E4E6
2 days agoE6E43SE3SE5NW3SE4NW6NE12NE18
G22
NE17NE19NE18NE21
G26
NE20NE17NE19NE18NE17NE13NE11NE8E5Calm

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 04:13 AM HST     1.18 feet High Tide
Tue -- 05:47 AM HST     Sunrise
Tue -- 09:39 AM HST     Moonrise
Tue -- 10:16 AM HST     -0.14 feet Low Tide
Tue -- 05:42 PM HST     2.49 feet High Tide
Tue -- 07:10 PM HST     Sunset
Tue -- 10:42 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.70.91.11.21.10.90.60.30-0.1-0.10.20.61.21.72.22.42.52.321.61.10.8

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Tue -- 01:17 AM HST     0.06 feet Low Tide
Tue -- 05:47 AM HST     Sunrise
Tue -- 07:01 AM HST     1.05 feet High Tide
Tue -- 09:40 AM HST     Moonrise
Tue -- 11:53 AM HST     0.16 feet Low Tide
Tue -- 07:09 PM HST     2.37 feet High Tide
Tue -- 07:10 PM HST     Sunset
Tue -- 10:41 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.10.10.30.50.81110.70.50.20.20.30.611.51.92.22.42.321.50.9

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 (6,6,7,8)
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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.