Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Hana, 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 6:13AMSunset 6:23PM Thursday September 21, 2017 11:05 AM HST (21:05 UTC) Moonrise 7:36AMMoonset 7:45PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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 Thu Sep 21 2017
.small craft advisory in effect through late this afternoon...
Rest of today..North winds to 25 knots. Wind waves 2 feet or less.
Tonight..North winds to 25 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less.
Friday night..North winds 15 knots. Wind waves 2 feet or less.
Saturday..North winds 20 knots. Wind waves 2 feet or less.
Saturday night..Northeast winds 15 knots. Wind waves 2 feet or less.
Sunday..Northeast winds 15 knots. Wind waves 2 feet or less.
Monday..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers.
PHZ100 930 Am Hst Thu Sep 21 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure far north of the state will slowly weaken through Friday. The ridge will move closer to the state during the weekend as a cold front passes to the north.

7 Day Forecast for Marine Location Near Hana, HI
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location: 20.77, -155.98     debug


Area Discussion for -
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Fxhw60 phfo 211954
afdhfo
area forecast discussion
national weather service honolulu hi
954 am hst Thu sep 21 2017

Synopsis
Locally breezy trades will gradually weaken during the next couple
of days as surface high pressure far northeast of the state
erodes. A typical pattern of mainly windward showers will
prevail, though interior and leeward big island will experience
extensive afternoon cloud cover and a few showers through at least
the weekend.

Discussion
A locally breezy and generally stable trade wind flow persists.

The trades are being driven by a somewhat strong 1032 mb high
sitting 1600 miles northeast of the islands and its associated
ridge stretching about 650 miles north of kauai. A trough within
the itcz remains north of 10n, and this is helping to enhance the
winds as the pressure gradient over the state is somewhat tight.

Mid level ridging is producing an inversion around 5,000 to 7,000
ft according to the overnight soundings and recent aircraft data,
and precipitable water within the trade wind flow ranges from near
september normal of almost 1.5 inches to as low as 1.1 inches in
dry slots. This is resulting in typical pockets of showers that
are producing modest rainfall along windward slopes. The far
southwestern edge of an upper level trough extends over the
islands. This feature is having little effect other than pulling
up some elevated moisture near the big island.

Expect little change this afternoon. Breezy trade winds will hold,
and windward shower activity will diminish. Afternoon clouds
along leeward and interior terrain on the big island will be more
extensive than normal, thanks to elevated moisture being pulled
northward by the upper level trough overhead.

A gradual decrease in trade winds is due on Friday and Saturday as
the ridge currently 650 miles north of the state is pushed
southward. Moderate trade winds are forecast to persist through
the upcoming week. No big changes in the moisture content and
stability of the trade wind flow are noted in the near future. As
a result, showers will continue to be largely confined to windward
slopes. The upper level trough will meander in place through the
weekend, which will likely lead to continued afternoon cloud cover
and spotty showers over leeward and interior big island.

Aviation
Vfr conditions prevail at all TAF sites and these conditions are
expected to continue through the day today and on into the evening
hours. There will likely be some brief MVFR conditions along
windward slopes at times as moisture riding in on the trades
interacts with island terrain.

Airmet tango remains in effect for low level turbulence over and
immediately south and west mountain ranges of all islands. The
airmet will likely continue through the day today.

Marine
Fresh to locally strong trades associated with 1032 mb high
pressure north-northeast of the state across the eastern pacific
will hold through Friday. Trades should weaken to the light to
moderate range by the end of the weekend as high pressure shifts
eastward and weakens in response to a frontal boundary passing far
north of the state. This pattern should hold through the first
half of the upcoming week.

Trade winds will generate rough surf along east facing shores into
Friday. Surf along east facing shores will trend down over the
upcoming weekend as the trades weaken locally and upstream.

Surf along south facing shores will remain small through early next
week with mainly background southeast and southwest swell energy
expected. The next potential long-period pulse out of the southwest
from the tasman sea will be possible by Sunday, which should lead to
a slight increase in surf. For the extended, strong- to gale-force
southwest winds associated with a low that has been impacting the
tasman sea over the past 24 hrs may lead to another small southwest
(210-220 deg) swell Tuesday through midweek.

A small northwest (310 deg) swell associated with broad and complex
low pressure that has been centered over the central pacific near
the date line over the past couple of days will fill in today and
hold into the weekend before easing. The latest surface analysis
showed 990 mb low centered near the aleutians around the date
line with a decent pocket of strong to near gale-force winds
focused within the 320 to 330 deg band relative to the islands.

This may end up reinforcing what is left of this weekend's 310 deg
energy by Monday, before completely fading Tuesday through
Wednesday. As a result, a slight increase in surf is expected
along north and west facing shores today, which should hold into
early next week before dropping off.

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

Public... Wroe
aviation... Burke
marine... Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi53 min NE 16 G 22 80°F 80°F1017.8 hPa
51205 29 mi56 min 80°F6 ft
ILOH1 - 1617760 - Hilo, HI 87 mi53 min NW 4.1 G 4.1 80°F 79°F1017.8 hPa

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE15
G19
NE16
G22
NE14
G22
NE18
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NE16
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G21
NE16
G22
NE14
G19
NE12
G15
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NE7
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G17
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G17
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NE6
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1 day
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NE15
G21
NE17
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NE17
G24
NE18
G24
NE15
G20
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G21
NE16
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NE13
G21
E7
G17
NE10
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NE11
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NE22
G27
NE12
G15
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G14
NW8
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NE16
G24
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G24
NE20
G25
NE15
G25
NE19
G30
NE24
G30
NE21
G28
NE20
G27
NE19
G24
NE14
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NE13
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G15
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N14
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G19
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G25
NE14
G21
NE13
G17
NE10
G17
NE16
G20
NE16
G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi71 minENE 17 G 2510.00 miPartly Cloudy86°F68°F55%1018 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE21
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NE8NE11
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NE13NE12NE10NE12NE8NE15NE11NE12NE13NE14NE13NE12
G18
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1 day agoE16
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NE19
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NE12
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G24
E12E13
G18
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E12NE5NE15
G22
NE7NE11NE9NE7NE5NE9NE12
G20
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2 days agoNE19
G27
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E17
G31
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NE14NE11NE9NE12NE15NE13
G23
NE12NE96E10
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G19
E13NE19
G25
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G29
E20
G28

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Thu -- 03:34 AM HST     2.25 feet High Tide
Thu -- 06:12 AM HST     Sunrise
Thu -- 07:35 AM HST     Moonrise
Thu -- 09:27 AM HST     0.39 feet Low Tide
Thu -- 03:35 PM HST     2.17 feet High Tide
Thu -- 06:20 PM HST     Sunset
Thu -- 07:45 PM HST     Moonset
Thu -- 09:37 PM HST     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.522.22.221.61.10.70.40.40.711.51.92.12.11.91.510.60.30.20.4

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Thu -- 04:47 AM HST     2.00 feet High Tide
Thu -- 06:14 AM HST     Sunrise
Thu -- 07:37 AM HST     Moonrise
Thu -- 10:32 AM HST     0.37 feet Low Tide
Thu -- 04:52 PM HST     1.95 feet High Tide
Thu -- 06:22 PM HST     Sunset
Thu -- 07:47 PM HST     Moonset
Thu -- 10:48 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.91.31.71.921.81.510.60.40.40.60.91.31.61.91.91.81.510.60.30.2

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 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.