Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Kapalua, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:24AMSunset 6:39PM Thursday March 23, 2017 11:56 AM HST (21:56 UTC) Moonrise 3:18AMMoonset 2:50PM Illumination 14% Phase: Waning Crescent; Moon at 26 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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PHZ120 Pailolo Channel- 947 Am Hst Thu Mar 23 2017
Rest of today..East winds 20 kt. Wind waves 4 ft. Northwest swell 3 ft. Isolated showers.
Tonight..East winds 20 kt. Wind waves 4 ft. Northwest swell 3 ft. Isolated showers.
Friday..East winds 20 kt. Wind waves 4 ft. Northwest swell 4 ft. Isolated showers in the morning.
Friday night..East winds to 25 kt. Wind waves 4 ft. Northwest swell 3 ft.
Saturday..East winds to 25 kt. Wind waves 6 ft. Northwest swell 3 ft.
Saturday night..East winds to 30 kt. Wind waves 6 ft. Northwest swell 4 ft. Isolated showers after midnight.
Sunday..East winds to 25 kt. Wind waves 6 ft. Northwest swell 5 to 6 ft. Isolated showers.
Monday..East winds to 25 kt. Wind waves 5 to 6 ft. Northwest swell 4 to 6 ft. Isolated showers.
PHZ100 947 Am Hst Thu Mar 23 2017
Synopsis for hawaiian coastal waters.. A ridge north of the state will weaken through tonight followed by a new high building north of the area Friday and Friday night. The new high will shift eastward and strengthen and will maintain moderate to fresh trade winds through the weekend and into early next week. A very large west northwest swell will affect the area Saturday through early next week.

7 Day Forecast for Marine Location Near Kapalua CDP, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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Fxhw60 phfo 232021
afdhfo
area forecast discussion
national weather service honolulu hi
1021 am hst Thu mar 23 2017

Synopsis
A trade wind regime is here and will continue through at least the
upcoming weekend. Showers riding in with the trades will favor the
windward and mountain areas, especially the night and morning
hours. The strength of the trades will be strengthening Friday to
moderate to locally strong speeds, and this pattern will hold
through at least the early part of next week.

Discussion
The clouds and showers of an old front have moved up the chain
from the big island to as far as oahu this morning, thus ending
about a week's worth of pleasant dry weather. It has been somewhat
showery across the windward sections of molokai maui, and parts of
windward big island thus far this morning. On oahu, there
certainly are more clouds over the koolau's but not much in the
way of showers. The models does not reduce the frequency of these
trade showers until Friday afternoon. In fact it appears to hint
the showers could be more tonight and Friday morning than this
morning.

A layer of high cirrus clouds is adding to the general low level
cloudiness resulting in the appearance of mostly cloudy skies.

The cirrus is part of an upper level disturbance with the back
edge of the field now in the kauai channel. It is moving east at
30 mph and at this speed the cirrus should clear oahu this
afternoon and maui this evening.

The strength of the trades will be light to moderate overall the
rest of today, favoring local sea breezes for the sheltered areas
of kauai, oahu, and lanai. But due to the high clouds, the
development of the low level afternoon clouds will be restricted
and limited due to the lack of sunshine. What is keeping the
trades light today is a weak surface ridge located 240 miles north
of kauai. The ridge is being held there by a front located 470
miles north of kauai. The ridge will strength on Friday as the
front vacates the area. This will allow locally strong trades to
spread to waters W and S of the big island by Friday afternoon...

then to waters around maui county Friday night. A new high forms
ne of the islands late in the weekend that will continue to
feed the islands with locally breezy trades into the first half of
next week.

As noted earlier, the frequency of the trade showers will be
down on Saturday, but picks up to more or less the typical amount
starting Saturday night. Despite this uptick, there will be plenty
of Sun to go around especially along the leeward beaches. The
somewhat breezy trades will help to cool things down.

Aviation
Low clouds from an old frontal boundary are embedded with
prevailing easterly flow, providing occasional MVFR ceilings along
windward slopes of molokai, maui and the big island.VFR
conditions dominate elsewhere. We will monitor the low clouds to
see if airmet sierra for mountain obscuration is needed today, but
for now no airmets are in effect.

Marine
A surface high is currently located far east northeast of the state
with a surface ridge trailing west to about 200 nm north of kauai.

As the high weakens through tonight, so will the ridge. However, a
new high will set up to the northeast and strengthen starting
Friday. Winds are expected to reach small craft advisory (sca) strength
by Friday afternoon or Friday night for the typical windy areas
around maui county and the big island. Trade winds will strengthen
further this weekend boosting wind speeds to fresh to locally
strong over the coastal waters as the high builds. Rough and
choppy conditions will persist along east facing shores due to
the strengthening trade winds.

A strong low pressure system currently about 2100 miles northwest
of hawaii will bring a very large west-northwest swell that will
build across the state Saturday and Saturday night. Surf along
most north and west facing shores will peak above warning level
heights. Surf will be the largest on kauai and niihau, and
slightly lower over the rest of the islands due to some blockage
caused by kauai and niihau. The SCA will need to be expanded this
weekend for the incoming swell and strengthening trade winds.

Hfo watches/warnings/advisories
None.

Discussion... Lau
aviation... Powell
marine... Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi48 min 77°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi45 min ENE 15 G 19 76°F 78°F1020.8 hPa
51203 - Kaumalapau, HI (146) 25 mi42 min 78°F3 ft
51202 - Mokapu Point, HI (098) 61 mi53 min 77°F4 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE18
G22
NE15
G20
NE13
G18
NE13
G24
NE9
G13
NE8
G11
W6
W8
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E3
G6
N2
N4
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SE4
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G6
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G16
NE11
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G16
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NE14
G19
NE13
G22
NE16
G21
NE16
G22
NE15
G23
NE17
G25
NE17
G23
NE13
G18
NE17
NE14
G18
NE9
G15
NE9
G12
NE11
G15
NE13
G18
NE12
G20
N12
G16
NE5
G9
NE14
G20
SE2
S3
NE8
G11
NW3
NW3
G7
NE16
G21
2 days
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N12
N12
G15
N9
G17
N11
G17
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G15
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G19
N13
G24
NE15
G19
NE12
G15
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G17
NE15
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G15
NE10
G15
NE13
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G18
NE13
G16
NE7
G10
NE10
G14
NE11
G17
NE15
NE15
G19
NE13
G19
NE15
G20
NE16
G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI1 mi67 minENE 1215.00 miShowers in Vicinity81°F64°F58%1021.3 hPa
Kahului, Kahului Airport, HI14 mi63 minENE 15 G 2110.00 miPartly Cloudy80°F68°F67%1021.7 hPa
Lanai City, Lanai Airport, HI23 mi61 minVar 610.00 miOvercast76°F64°F69%1023 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE15
G22
NE15NE12
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G20
6----------------------------NE12NE12NE10NE10E12
1 day ago66NE18NE17
G23
NE16
G24
----------------------------NE12NE10NE12E10NE12
G22
2 days agoE13
G24
NE12
G23
NE13
G24
NE12
G23
NE16
G27
NE12
G22
NE14
G24
------------------------NE10NE12NE15NE15NE15
G22

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 12:33 AM HST     1.88 feet High Tide
Thu -- 03:18 AM HST     Moonrise
Thu -- 06:27 AM HST     Sunrise
Thu -- 07:28 AM HST     0.24 feet Low Tide
Thu -- 12:56 PM HST     1.05 feet High Tide
Thu -- 02:50 PM HST     Moonset
Thu -- 06:16 PM HST     0.21 feet Low Tide
Thu -- 06:38 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.91.71.410.70.40.30.30.40.60.811.110.80.50.30.20.20.40.81.11.5

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 12:19 AM HST     1.97 feet High Tide
Thu -- 03:17 AM HST     Moonrise
Thu -- 06:26 AM HST     Sunrise
Thu -- 07:06 AM HST     0.60 feet Low Tide
Thu -- 11:50 AM HST     1.10 feet High Tide
Thu -- 02:49 PM HST     Moonset
Thu -- 05:43 PM HST     0.11 feet Low Tide
Thu -- 06:38 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.91.81.51.20.90.70.60.60.80.91.11.110.80.60.30.20.10.30.611.41.8

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 (17,4,5,8)
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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.