Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Kihei, HI

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:56AMSunset 6:50PM Thursday April 26, 2018 3:27 AM HST (13:27 UTC) Moonrise 4:09PMMoonset 3:58AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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- 934 Pm Hst Wed Apr 25 2018
.small craft advisory in effect through early Thursday morning...
Tonight..Northeast winds to 25 knots. Wind waves 3 feet. Isolated showers through the night.
Thursday..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Thursday night..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers through the night.
Friday..Winds variable less than 10 knots becoming southwest 10 knots in the afternoon. Wind waves 2 feet or less. Isolated showers.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze through the night. Isolated showers in the evening. Showers likely after midnight.
Saturday..Winds variable less than 10 knots becoming north 15 knots in the afternoon. Wind waves 2 feet or less. Scattered showers.
Saturday night..Northeast winds 10 knots. Wind waves 2 feet or less. Scattered showers in the evening, then showers likely after midnight.
Sunday..North winds 10 knots in the morning backing west, then veering northeast in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Showers likely.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
PHZ100 934 Pm Hst Wed Apr 25 2018
Synopsis for hawaiian coastal waters.. Strong high pressure northeast of the area will weaken through Thursday. A low will develop north of the islands on Friday, and linger through the weekend. A front associated with the low will move down the island chain Friday through Saturday, with the front stalling near the big island Sunday and Monday.

7 Day Forecast for Marine Location Near Kihei, HI
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location: 20.75, -156.45     debug


Area Discussion for -
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Fxhw60 phfo 260639
afdhfo
area forecast discussion
national weather service honolulu hi
839 pm hst Wed apr 25 2018

Synopsis
Trade winds will begin to decrease late tonight through Thursday
night as high pressure to our north weakens. Low level flow will
shift to southeasterlies late Thursday and Thursday night as a
front approaches from the northwest. This front will bring
increased rainfall to the islands, with showers reaching kauai
Thursday night and Friday, before moving down the island chain
Friday night through Sunday morning. Showers may linger into the
new work week over the big island.

Discussion
A 1031 mb high far north of the main hawaiian islands continues
to drive moderate to locally breezy trade winds across the chain this
evening. Satellite loop shows a band of broken to overcast low
clouds embedded within trade flow approaching the islands from the
east, but skies are generally partly cloudy to clear across most
areas of the islands at this hour. Trade showers will likely pick
up tonight as the cloud band arrives. Rainfall will continue to
favor windward and mauka areas.

Models show trade winds will begin to decrease late tonight
through Thursday night as the high to our north weakens and gets
pushed eastward by a front expected to develop to our northwest.

Local winds will begin to change from weak northeasterly trades
to southeasterlies as this front approaches the islands late
Thursday and Thursday night. The front will reach kauai early
Friday, spreading increased showers along and ahead of it.

Uncertainty remains concerning the strength of the front as it
moves across the islands Friday into Sunday. Models show colder
temperatures aloft developing by Sunday, likely making this front
a more prolific rain producer as it reaches the big island late in
the weekend. The probability for heavy rainfall increases from
Friday through Sunday, but it remains too early to tell which
island, if any, is under threat. The frontal boundary may stall
near the big island, possibly providing that islands with lots of
rainfall into early next week.

We expect drier trade wind flow will return to the smaller islands
after frontal passage, setting up a pattern of windward and mauka
showers, post-frontally, into next week. Moisture from the frontal
boundary near the big island may enhance these showers from time
to time.

Aviation
Moderate strength trade winds will begin to weaken on Thursday as
a trough approaches the islands from the northwest. Airmet tango
remains in effect overnight for tempo moderate turbulence over and
downwind of mountain areas. This low level turbulence airmet will
likely be removed by Thursday morning as trade wind speeds
decrease.

A band of unstable clouds just east of the big island will drift
slowly across the state producing periods of MVFR ceilings and
showers mainly along windward slopes of all islands through
Thursday morning. A few of these showers will drift leeward,
however mostlyVFR conditions are forecast along southern and
western slopes of each island.

Marine
A surface high far to the nne will move E and gradually weaken
over the next two days as a low develops about 1000 miles N of
the islands. Fresh to locally strong trade winds will weaken
Thursday, then collapse completely Thursday night as a weak trough
develops over the area. A small craft advisory (sca) currently
posted for the windier marine zones around maui and the big island
will likely be allowed to expire Thursday morning as the high
weakens and trade winds begin to diminish.

A front associated with the developing low is expected to reach
kauai sometime Friday, then move down the chain through Saturday
before potentially stalling near the big island through the rest
of the weekend. Initially, right behind the front, N winds may
briefly reach SCA criteria in some of the marine zones. The low
will send a mix of swells and seas toward the islands this weekend
into next week, with associated seas rising above 10 feet in most
zones, necessitating a SCA from late Saturday into Monday.

A moderate long-period nnw swell is expected to arrive tomorrow
and peak Friday, with peak surf heights below advisory levels. The
low that develops N of the islands late in the week will remain
in place until early next week. The amount of swell surf that
arrives in the islands is somewhat uncertain, and will depend on
the evolution of the low and associated fetch. Current indications
are that a fairly significant (but poorly organized) swell will
produce advisory-level surf along exposed N and W facing shores,
with the peak of the swell around Sunday.

Elsewhere, several pulses of relatively small SW to S swell are
expected over the next week or so, with a peak in swell energy
around Sunday. Rough and choppy surf along E facing shores will
diminish Thursday and Friday. The oahu surf discussion (srdhfo) contains
further details on the sources of the swells.

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

Discussion... Powell
aviation... Bohlin
marine... Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi45 min NNE 14 G 17 73°F 77°F1016.9 hPa
51205 19 mi57 min 75°F8 ft
51202 - Mokapu Point, HI (098) 80 mi53 min 76°F8 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
G19
N8
NE8
NE13
G20
NE15
G19
NE13
G17
NE14
G18
NE13
G20
NE14
NE17
G22
NE16
G22
N13
G18
N16
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G16
NE7
G11
NE15
G19
NE13
G17
NE12
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NE12
G16
NE12
G19
NE12
G16
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G21
1 day
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NE8
G12
NE16
G20
NE15
G19
N12
G15
NE16
G20
NE16
G23
NE19
G23
NE16
G23
NE15
G24
NE19
G30
NE20
G25
NE20
G26
NE14
G22
NE12
G21
NE13
G22
N3
G10
NE9
G17
NE15
G19
NE13
G19
NE12
G17
NE9
G12
NE9
G12
NE10
G14
NE12
G17
2 days
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NE11
G15
NE9
G15
NE8
G17
NE8
G22
NE17
G21
NE5
G15
NE8
G15
NE7
G18
NE11
G24
NE9
G19
NE19
G23
NE17
G22
NE15
G24
NE14
G22
NE14
G21
NE13
G19
NE13
G16
NE18
G22
NE16
G20
NE18
G25
NE16
G21
NE15
G19
NE15
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI10 mi33 minENE 127.00 miOvercast72°F71°F97%1017.4 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE12NE10NE9NE8NE14NE12NE21
G24
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NE24NE20
G26
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NE18NE12E9NE12
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NE16NE12
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1 day agoNE11
G18
NE12NE13NE15NE12
G22
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G29
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E15
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NE12NE9NE13NE7NE8NE11NE10NE10
G20
2 days agoNE12NE13NE9NE12NE16NE18
G25
NE19
G24
NE17NE15NE19NE26
G31
NE14
G23
E18
G29
NE17NE11
G21
NE13
G21
NE13
G23
NE12NE16NE13
G20
NE12NE11NE13NE13

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Thu -- 01:23 AM HST     1.92 feet High Tide
Thu -- 03:57 AM HST     Moonset
Thu -- 05:58 AM HST     Sunrise
Thu -- 07:44 AM HST     -0.11 feet Low Tide
Thu -- 02:13 PM HST     1.71 feet High Tide
Thu -- 04:09 PM HST     Moonrise
Thu -- 06:48 PM HST     Sunset
Thu -- 07:53 PM HST     0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.91.91.61.20.70.2-0.1-0.100.40.81.21.51.71.61.410.60.30.20.40.61

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 12:14 AM HST     2.06 feet High Tide
Thu -- 03:57 AM HST     Moonset
Thu -- 05:58 AM HST     Sunrise
Thu -- 06:49 AM HST     0.04 feet Low Tide
Thu -- 12:55 PM HST     1.67 feet High Tide
Thu -- 04:09 PM HST     Moonrise
Thu -- 06:40 PM HST     0.29 feet Low Tide
Thu -- 06:48 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.121.71.30.80.40.100.20.50.91.31.61.71.61.30.90.60.30.30.50.81.21.7

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 (9,2,3,4)
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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.