Thursday, June22, 2017 L-36.com


Marine Weather and Tides
Hana, 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 5:45AMSunset 7:11PM Thursday June 22, 2017 4:17 AM HST (14:17 UTC) Moonrise 4:30AMMoonset 5:58PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 330 Am Hst Thu Jun 22 2017
.small craft advisory in effect through late this afternoon...
Today..North winds to 25 knots. Wind waves 2 feet or less.
Tonight..Northeast winds 20 knots. Wind waves 2 feet or less.
Friday..Northeast winds 10 knots veering south in the afternoon. Wind waves 2 feet or less.
Friday night..Northeast winds 20 knots. Wind waves 2 feet or less.
Saturday..Northeast winds 15 knots. Wind waves 2 feet or less.
Saturday night..Northeast winds 15 knots. Wind waves 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Sunday..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Monday..Northeast winds 15 knots. Wind waves 2 feet or less.
PHZ100 330 Am Hst Thu Jun 22 2017
Synopsis for hawaiian coastal waters.. Moderate to occasionally breezy trade winds will persist into early next week as a ridge of high pressure remains far north of the islands.

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 221330
afdhfo
area forecast discussion
national weather service honolulu hi
330 am hst Thu jun 22 2017

Synopsis
High pressure far north of the islands will maintain gentle to
locally breezy trade winds through Friday. The trade winds will
deliver passing clouds and showers, mainly to windward areas. A weak
mid-level trough developing near the islands this weekend and early
next week may weaken the trades and bring an increase in showers.

Discussion
High pressure cells are centered far nnw and nne of the islands this
morning, with a low and associated stalled front separating the two.

The low-level gradient S of the highs is supporting trade wind flow
over the islands, with speeds ranging from light in sheltered
leeward locations to breezy in the more exposed areas. A low aloft
near 25n141w has been triggering high-based thunderstorms (in an
area otherwise dominated by low-topped stratus) about 900-1500 miles
to the ene of the islands over the past 24-36 hours, with the low
currently tracking nw, and associated thunderstorm coverage
diminishing. Overnight soundings continue to highlight a stable
island atmosphere, with a strong capping inversion based near 8 kft,
and a slight overnight increase in pwat to near 1.25". Based on
radar and satellite observations, the inversion is sufficiently high
to allow clouds embedded in the trade flow to produce showers,
especially as they interact with island terrain.

Little significant change to the overall weather pattern is expected
through Friday, with passing clouds fueling a few showers, mainly
over windward areas. A mid-level ridge over the islands will slowly
and slightly weaken as the low aloft slowly moves N and gradually
dissipates NE of the islands. A trend toward slightly weaker trade
winds is anticipated Friday and Saturday as a weakness in the low-
level gradient, associated with the dissipating low aloft, moves
over the islands from the e. The GFS also indicates increasing low-
level moisture associated with this feature moving in on the trades
by Saturday.

On Sunday and Monday, a weak and subtle trough in the surface
pressure and wind fields is expected to move E to W across the area,
potentially leading to another slight decrease in trade wind speeds.

The GFS is still depicting a slightly sharper trough than the ecmwf,
and depicts a weak surface trough that passes over the islands
Sunday, resulting in a veered low-level flow that could turn surface
winds to the ese into Monday. Although the low aloft is expected to
dissipate NE of the area, it leaves behind a weakness as a new
trough aloft moving in from the N helps to cool the mid-levels over
the islands. The combination of the incoming mid-level system and a
possibility for veered low level flow may bring increased shower
chances this weekend, and previous pop forecasts have been left
unchanged. The best chance for additional showers will be mostly
windward and mauka, though possibly some sea breeze or upslope
showers as well if the winds weaken enough.

On Tuesday and Wednesday, the high currently to the nnw will move e,
and models agree that breezy ene trades will prevail, delivering a
few showers to windward areas, with a ridge aloft building over the
area from the nw.

Marine
The current long period ssw swell will gradually decrease. However,
this swell will be reinforced by another above average south swell,
arriving this afternoon, and peaking late tonight or Friday.

In addition to the new southerly swell, tides have been running
about a half a foot above predicted levels. These elevated tide
levels will increase the risk for minor coastal flooding when
combined with the high surf. For the next few afternoons, the
predicted high tides are around 2.5 feet, which does not include the
extra 1 2 foot mentioned above.

Other wave trains are affecting hawaii as well, with a small out-of-
season northwest swell diminishing today, a small trade wind-
generated swell and a short period southeast swell. The southeast
swell will continue into the weekend and will add a small component
to the wave heights along south facing shores.

In the longer range, models indicate a northeast swell developing
for the beginning of next week. This swell will need to be monitored
as it interacts with the trade wind swell, and a high surf advisory
may eventually be needed for east facing shores if the swell comes
in bigger than anticipated.

Moderate to occasionally fresh trade winds may diminish slightly
over the weekend, with a small craft advisory now in effect through
this afternoon for the typically windier zones around maui and the
big island.

For more details on the surf, please refer to the oahu collaborative
surf forecast (srdhfo) prepared by pat caldwell under wmo header
fxhw52 phfo.

Aviation
High pressure far NE of the state will maintain light to moderate
trade winds over the islands through the period. Clouds and showers
will tend to favor the windward and mountain areas, with some
showers introducing brief periods of MVFR. Otherwise, expectVFR
conditions. No airmets are expected.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening for south facing
shores of all islands.

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

Discussion... Birchard
marine... Kinel
aviation... Bedal


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi65 min NNE 2.9 G 5.1 75°F 79°F1014.6 hPa
51205 29 mi68 min 79°F5 ft
ILOH1 - 1617760 - Hilo, HI 87 mi65 min SSW 1.9 G 4.1 73°F 78°F1013.8 hPa

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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G20
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N4
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E10
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NE7
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NE14
NE6
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G17
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G14
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G20
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G26
NE12
G26
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G24
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G31
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G29
NE16
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G26
NE13
G23
NE15
G24
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G27
NE8
G15
NE14
G20
E8
G12
E4
SE2
SE1

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi23 minNNE 510.00 miFair73°F68°F84%1014.8 hPa

Wind History from HOG (wind in knots)
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Last 24hrS4E7E6NE12NE13NE16
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NE13NE8NE7NE8NE3E4NE6NE83NE5
1 day agoS3CalmCalmS3SW4CalmE11
G23
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NE9NE7NE9NE6NE10NE12NE9NE9
2 days agoE5NE8NE73NE12E17
G24
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G29
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G29
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G31
E16
G22
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G27
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G27
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G20
E4CalmS3SE4

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Thu -- 12:57 AM HST     1.32 feet High Tide
Thu -- 04:30 AM HST     Moonrise
Thu -- 05:44 AM HST     Sunrise
Thu -- 06:38 AM HST     -0.40 feet Low Tide
Thu -- 02:11 PM HST     2.89 feet High Tide
Thu -- 05:57 PM HST     Moonset
Thu -- 07:07 PM HST     Sunset
Thu -- 09:05 PM HST     0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.31.20.90.4-0-0.3-0.4-0.20.30.91.62.22.72.92.82.41.81.20.60.20.10.20.5

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Thu -- 02:22 AM HST     1.15 feet High Tide
Thu -- 04:32 AM HST     Moonrise
Thu -- 05:46 AM HST     Sunrise
Thu -- 07:56 AM HST     -0.35 feet Low Tide
Thu -- 03:20 PM HST     2.73 feet High Tide
Thu -- 05:59 PM HST     Moonset
Thu -- 07:09 PM HST     Sunset
Thu -- 10:02 PM HST     0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.811.11.10.90.50.1-0.2-0.4-0.20.20.81.422.52.72.72.31.81.10.60.30.20.2

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 (10,2,3,4)
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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.