Thursday, May25, 2017 L-36.com


Marine Weather and Tides
Haiku-Pauwela, HI

Version 3.4
What's New / NOTES
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 5:43AMSunset 7:02PM Thursday May 25, 2017 10:01 AM HST (20:01 UTC) Moonrise 5:52AMMoonset 7:16PM Illumination 0% Phase: New Moon; Moon at 0 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- 933 Am Hst Thu May 25 2017
Rest of today..Northeast winds 20 knots. Wind waves 2 feet or less.
Tonight..North winds 15 knots. Wind waves 2 feet or less.
Friday..North winds 15 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Friday night..Northeast winds 15 knots. Wind waves 2 feet or less. SWell south 3 feet.
Saturday..Northeast winds 10 knots. Wind waves 2 feet or less. SWell south 4 feet. Scattered showers in the afternoon.
Saturday night..Northeast winds 10 knots. Wind waves 2 feet or less. SWell south 3 to 4 feet.
Sunday..Northeast winds 10 knots. Wind waves 2 feet or less. SWell south 3 feet. Haze. Scattered showers.
Monday..Northeast winds 10 knots. Wind waves 2 feet or less. Haze. Scattered showers.
PHZ100 933 Am Hst Thu May 25 2017
Synopsis for hawaiian coastal waters.. Ridge of high pressure north of the state is forecast to weaken into the weekend due to low pressure well northeast of the marine area.

7 Day Forecast for Marine Location Near Haiku-Pauwela, HI
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location: 20.92, -156.28     debug


Area Discussion for -
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Fxhw60 phfo 251409
afdhfo
area forecast discussion
national weather service honolulu hi
409 am hst Thu may 25 2017

Synopsis
Low clouds and showers associated with a weakening frontal
boundary will continue to move across the state today, especially
over the western islands. Trade winds will gradually weaken
through Friday, with light and variable winds expected during the
memorial day holiday weekend. This will produce muggy conditions,
and allow the development of local afternoon sea breezes and
nighttime land breezes this weekend. A weak upper level trough
passing over the state this weekend may provide some enhancement
to the afternoon showers, especially over leeward and interior
sections. In addition, volcanic haze may spread over the smaller
islands starting Sunday.

Discussion
The pressure gradient south of a 1039 mb surface high located
near 44n 177w, or almost 1900 miles northwest of honolulu.

However, a surface low located almost 1100 miles north-northeast
of the islands is beginning to diminish the pressure gradient over
the state. As a result, expect the trades to gradually weaken
today.

Aloft, a weak middle tropospheric trough is above the state. This
continues to maintain slight instability across the islands, with
no significant low-level trade wind inversion evident in the
early morning soundings from hilo and lihue. Satellite imagery and
radar reflectivity data show broken to overcast low clouds and
scattered showers associated with an old frontal boundary are
being transported by the low-level trade wind flow over kauai,
oahu and molokai. Additional scattered to locally broken low
clouds and isolated showers are also moving toward the eastern
half of the island chain.

The forecast guidance indicates the old frontal boundary will
continue to be a source of moisture in the form of low clouds and
showers moving mainly into the western end of the state today,
before eventually dissipating later tonight. Windward facing
sections of the state will continue to have some showers through
Friday.

The background synoptic flow is expected to shift out of the
southeast this weekend. Since the big island typically blocks most
of the low-level winds from this direction across the smaller
islands, expect the local winds to become light and variable. This
light wind regime will allow local afternoon sea breeze and
nighttime land breeze circulations to develop over the leeward and
interior sections of the individual islands from Saturday into
early next week. Weak middle to upper tropospheric troughs are
also expected to move over the islands this weekend. In addition,
a low aloft is forecast to form over the state. This feature is
expected to produce some atmospheric instability over the region
this weekend. The instability may enhance rainfall during daytime
heating, which could allow for brief localized heavy downpours to
occur Saturday and Sunday afternoons, especially over leeward and
interior sections of the island chain.

Note that the light winds will also bring muggy conditions during
most of the memorial day holiday weekend. In addition, the weak
southeasterly background flow may transport volcanic haze, or vog,
to the smaller islands from sources on the big island by Sunday.

Once this haze arrives, it is expected to linger into early next
week.

Aviation
High pressure north of hawaii will keep the islands in a
northeasterly trade wind regime. A remnant cold frontal
convergence boundary moving over kauai... Oahu and molokai this
morning will continue to drift southeastward across the islands
over the next 24 hours. Expect scattered to numerous showers and
periods of MVFR conditions along this convergence band. Expect
scattered MVFR ceilings and visibility along the convergence
band.

Airmet sierra remains in effect this evening for mountain
obscuration over kauai... Oahu and molokai with low cloud
ceilings.

Airmet tango continues for mechanical turbulence for kauai over
mountains and south through east sections due to the breezy trade
winds. Wind speeds will continue to decrease this morning likely
ending the turbulence airmet.

Marine
The latest surface analysis showed a large area of high pressure
(1039 mb) encompassing much of the northern pacific that continues
to support fresh trade winds across the local waters. An ascat
pass overnight reflected moderate to fresh trades over the area.

As a result, the small craft advisory will be dropped in the
morning package. Trades are forecast to weaken further into the
upcoming holiday weekend as a weakness within the ridge develops
in response to low pressure that has developed well northeast of
the state. Land sea breeze conditions will become a possibility
over the weekend, which will allow the seas to trend down locally.

Surf along east facing shores will trend down into the weekend as
the trades relax. A small north-northeast swell, however, will
support small surf continuing at the exposed spots each day into
the weekend.

Surf along north facing shores will steadily trend down into the
weekend with mainly surf continuing at spots exposed to north-
northeast energy. For the long range, models are hinting at another
small to moderate north-northwest (330 deg) swell filling in early
next week due to a low tracking east of the date line over the
weekend and deepening as it passes well north of the state on
Monday.

The largest south swell this season is forecast to fill in later
today through Friday, peak Friday night through Saturday above
advisory levels, then slowly ease into early next week. This swell
peaked at the samoa buoy early Tuesday, which should correspond
to a peak locally along south facing shores Friday night into
Saturday. A high surf advisory for south facing shores will likely
be issued this afternoon, which will continue through the
memorial day weekend.

In addition to the expected advisory-level surf through the memorial
day weekend along south facing shores, impacts from coastal flooding
that have already begun each afternoon with the high tide cycles
will likely become enhanced Friday and Saturday evenings due to a
combination of record level spring (king) tides (especially for
maui county and oahu) and large surf expected. These waters levels
could break the late april record that occurred last month at
honolulu on Friday and Saturday. Flooded beaches, vulnerable low-
lying roads, boat ramps and docks will be impacted during these
hours surrounding the high tides each day. Water levels are
forecast to trend back down toward normal through the upcoming
week.

The following are the daily high tide times for honolulu that
will correspond to coastal flooding impacts each day through the
weekend:
5 25 today 4:20 pm hst
5 26 Friday 5:07 pm hst (peak water levels surf expected)
5 27 Saturday 5:55 pm hst (peak water levels surf expected)
5 28 Sunday 6:46 pm hst
5 29 Monday 7:40 pm hst
for more detailed information on surf for oahu, see the latest
collaborative nearshore swell and wind forecast that was issued
Wednesday afternoon (

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi44 min NNE 13 G 16 76°F 79°F1018.1 hPa
51205 10 mi53 min 78°F6 ft
51202 - Mokapu Point, HI (098) 82 mi58 min 79°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE19
G23
NE17
G22
NE18
G22
NE19
G24
NE21
G27
N20
N15
G20
NE15
NE18
NE12
G19
NE11
G15
NE10
G13
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NE7
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NE7
G10
NE4
G7
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N6
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NW7
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N14
1 day
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NE13
G19
NE14
G20
NE16
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G22
NE14
G17
NE19
G23
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G24
NE15
G20
NE16
G21
NE14
G22
NE11
G14
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G16
NE9
G13
NE9
G14
N10
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NE11
G15
NE7
G12
NE6
G12
N7
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G11
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NE11
G17
NE15
2 days
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NE10
G18
NE16
G21
NE12
G21
NE17
G24
NE21
NE15
G21
NE12
G24
NE11
G25
NE17
G22
NE12
G16
NE9
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G12
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G19
NE7
G12
NE12
G16
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G15
NE7
G14
NE9
G14
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NE6
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NE7
G10
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G12
NE10
G13
NE14
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI8 mi68 minNNE 1610.00 miPartly Cloudy81°F66°F61%1018.2 hPa
Lahaina - West Maui, HI20 mi72 minNE 1215.00 miPartly Cloudy79°F0°F%1018.3 hPa

Wind History from HOG (wind in knots)
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NE16NE12NE10NE9NE7NE6NE65SE4SE5CalmNE8NE5NE11NE16NE17
1 day agoE12
G19
NE20NE19
G26
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G28
NE14
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G25
NE21
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G24
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NE9NE9NE12NE11NE9NE8NE8NE8NE9NE15
G19
NE16NE20
2 days agoNE19
G25
NE20
G26
NE19
G31
NE21
G25
NE20
G28
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G27
NE23NE16
G22
NE12NE7NE8NE9NE7NE9NE9NE7NE8NE7NE6NE7NE8NE8NE13
G21
NE18

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 01:23 AM HST     1.59 feet High Tide
Thu -- 05:45 AM HST     Sunrise
Thu -- 05:53 AM HST     Moonrise
Thu -- 07:48 AM HST     -0.69 feet Low Tide
Thu -- 09:46 AM HST     New Moon
Thu -- 02:58 PM HST     2.72 feet High Tide
Thu -- 07:00 PM HST     Sunset
Thu -- 07:16 PM HST     Moonset
Thu -- 09:19 PM HST     0.57 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.51.30.80.3-0.2-0.6-0.7-0.500.71.52.12.62.72.62.21.71.20.80.60.60.8

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Thu -- 03:31 AM HST     1.20 feet High Tide
Thu -- 05:45 AM HST     Sunrise
Thu -- 05:53 AM HST     Moonrise
Thu -- 09:05 AM HST     -0.36 feet Low Tide
Thu -- 09:46 AM HST     New Moon
Thu -- 04:20 PM HST     2.65 feet High Tide
Thu -- 07:00 PM HST     Sunset
Thu -- 07:16 PM HST     Moonset
Thu -- 10:57 PM HST     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.711.21.210.60.2-0.2-0.4-0.20.10.71.31.92.42.62.62.21.71.10.50.20.1

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 (16,3,4,5)
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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.