Saturday, April20, 2019 L-36.com


Marine Weather and Tides
Kapalua, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:01AMSunset 6:47PM Saturday April 20, 2019 6:15 AM HST (16:15 UTC) Moonrise 8:27PMMoonset 7:16AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 312 Am Hst Sat Apr 20 2019
.small craft advisory in effect through Sunday afternoon...
Today..East winds to 25 knots. Wind waves 6 feet. Northwest swell 3 feet. Isolated showers in the morning.
Tonight..East winds to 25 knots. Wind waves 6 feet. Isolated showers after midnight.
Sunday..East winds to 25 knots. Wind waves 7 feet. Isolated showers in the morning.
Sunday night..East winds to 25 knots. Wind waves 6 feet. Isolated showers after midnight.
Monday..East winds to 25 knots. Wind waves 6 feet. Isolated showers.
Monday night..East winds to 25 knots. Wind waves 5 feet. Isolated showers.
Tuesday..East winds to 25 knots. Wind waves 5 to 6 feet. Isolated showers.
Wednesday..East winds to 25 knots. Wind waves 7 to 9 feet. Isolated showers.
PHZ100 312 Am Hst Sat Apr 20 2019
Synopsis for hawaiian coastal waters.. The ridge will strengthen north of the state this weekend, then remain in place into next week.


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


Area Discussion for -
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Fxhw60 phfo 201322
afdhfo
area forecast discussion
national weather service honolulu hi
322 am hst Sat apr 20 2019

Synopsis
Seasonal trade wind conditions will prevail through the weekend and
much of next week as high pressure remains in place to the north.

Clouds and showers will favor the typical windward locations each
day.

Discussion
The latest surface analysis showed a 1029 mb area of high pressure
centered over the northeast pacific and a ridge extending west-
southwest from it to an area north of the islands. Water vapor
imagery showed an upper ridge positioned over the region and
mostly dry air aloft. Satellite data and upper air soundings
depicted moisture levels near to slightly below normal for this
time of year and a strong subsidence inversion between six and
eight thousand feet. Rain gages support the dry conditions with
minimal accumulations measured over the past 12-hrs (through 2 am
hst). Peak totals for this period have been on the big island
along the windward coast from hamakua to north kohala (.22 to .7
inches).

Guidance supports the mostly dry and stable trade wind pattern
continuing through much of next week. Trades are forecast to
trend up today through Sunday due to the ridge strengthening north
of the islands. Breezy conditions will result, especially through
the late morning and afternoon hours. The upper ridge is forecast
to remain over the region into next week with mostly dry mid- to
upper-level air holding in place. These upper conditions combined
with a strong subsidence inversion will limit the rainfall
potential coverage, even for windward locations. The exception
will be due to pockets of higher moisture moving through
periodically within the trades, which will translate to better
windward rainfall coverage.

For the extended period, guidance depicts lowering upper heights and
the surface ridge to the north weakening due to a weak shortwave
trough and surface front moving into the region late next week.

Forecast confidence this far out remains low, but if this scenario
does evolve, trades would trend down, potentially becoming light
and variable for some locations.

Aviation
A high pressure ridge north of the state will keep the islands in
a moderate to breezy trade wind weather pattern through Monday.

Near surface wind speeds are strong enough to support moderate low
level turbulence over and south through west of mountain ranges
of all islands. Scattered shower activity will favor windward and
mountain sections with brief periods of MVFR conditions mainly
during the overnight hours.

Airmet tango remains in effect for tempo moderate turbulence below
080. This airmet will likely remain in effect through the
weekend.

Marine
No significant changes to the forecast with the morning package.

The ridge to the north of the islands will maintain fresh to
strong trade winds into early next week. The small craft advisory
(sca) is in effect for most of the waters near maui county and the
big island through tonight, and through tomorrow for the more
typical windier areas. Will wait to see how things pan out today
before making any change in the timing of the sca.

Surf along all shores is expected to remain below advisory levels
for the next week. The current north-northwest swell will
continue to decline through the weekend. A small, west-northwest
swell is possible early next week. Background south-southwest
swells will keep surf small along south facing shores through the
weekend. An upward trend along south facing shores is possible
early next week, due to recent activity southeast of new zealand.

Surf along east facing shores will see a bump over the weekend
in response to the trade winds. See the latest oahu surf
discussion (srdhfo) for additional details on surf and swell.

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

Small craft advisory until 6 am hst Sunday for kaiwi channel-
maui county windward waters-big island windward waters.

Discussion... Gibbs
aviation... Bohlin
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi46 min 75°F7 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi34 min NNE 9.9 G 13 73°F 1019.6 hPa
51213 27 mi46 min 77°F2 ft
51202 - Mokapu Point, HI (098) 61 mi46 min 76°F7 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI14 mi22 minENE 10 G 1710.00 miA Few Clouds73°F66°F79%1019.7 hPa
Lanai City, Lanai Airport, HI23 mi20 minNNE 510.00 mi67°F66°F100%1019.3 hPa

Wind History from HJH (wind in knots)
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Last 24hr--NE14NE15NE12
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NE10NE12------------------------NE12
1 day agoNE11
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2 days agoE6
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------------------------NE10

Tide / Current Tables for Pukoo Harbor, Molokai Island, Hawaii
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Pukoo Harbor
Click for Map
Sat -- 03:26 AM HST     1.13 feet High Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 07:15 AM HST     Moonset
Sat -- 09:35 AM HST     -0.29 feet Low Tide
Sat -- 04:18 PM HST     2.01 feet High Tide
Sat -- 06:48 PM HST     Sunset
Sat -- 08:28 PM HST     Moonrise
Sat -- 11:17 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.11.10.90.60.3-0.1-0.3-0.3-0.10.30.91.41.8221.71.30.90.50.20.1

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sat -- 03:54 AM HST     1.23 feet High Tide
Sat -- 06:03 AM HST     Sunrise
Sat -- 07:15 AM HST     Moonset
Sat -- 09:43 AM HST     -0.19 feet Low Tide
Sat -- 04:46 PM HST     2.11 feet High Tide
Sat -- 06:47 PM HST     Sunset
Sat -- 08:27 PM HST     Moonrise
Sat -- 11:25 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.21.21.10.80.50.1-0.1-0.2-00.30.81.31.822.11.91.61.10.70.40.2

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 (12,3,4,5)
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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.