Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Launiupoko, 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 5:59AMSunset 6:48PM Sunday April 22, 2018 11:58 AM HST (21:58 UTC) Moonrise 12:14PMMoonset 12:47AM Illumination 51% Phase: First Quarter Moon; Moon at 7 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- 1014 Am Hst Sun Apr 22 2018
.small craft advisory in effect through Tuesday afternoon...
Rest of today..North winds to 25 knots. Wind waves 4 feet.
Tonight..Northeast winds to 25 knots. Wind waves 4 feet.
Monday..North winds to 25 knots. Wind waves 3 feet.
Monday night..Northeast winds to 25 knots veering east after midnight. Wind waves 2 feet or less.
Tuesday..East winds 25 knots. Wind waves 2 feet or less.
Tuesday night..Northeast winds 20 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds 20 knots. Wind waves 2 feet or less.
Thursday..Southeast winds 20 knots backing northeast in the evening, then becoming variable less than 10 knots after midnight. Wind waves 2 feet or less.
PHZ100 1014 Am Hst Sun Apr 22 2018
Synopsis for hawaiian coastal waters.. Strong high pressure will hold north of the waters through midweek, then weaken through the second half as a front approaches and moves into the area.

7 Day Forecast for Marine Location Near Launiupoko, HI
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location: 20.85, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 221945
afdhfo
area forecast discussion
national weather service honolulu hi
945 am hst Sun apr 22 2018

Synopsis
Quiet trade wind weather is expected to finish out the weekend
with plenty of sunshine for most areas. High pressure passing
north of the islands on Monday will give us a bit of an uptick in
trade wind speeds. Areas of moisture riding in on the trades will
give increased clouds and showers to some windward and mauka
areas on Tuesday, and again later Wednesday into Wednesday night.

Trade wind speeds will gradually decline during the latter half of
the week as low pressure develops to our north. A cold front may
push down the chain next weekend.

Discussion
Quiet trade wind weather with a good deal of sunshine is expected
for most places today, in stark contrast to some other weekends
over the last several weeks. A 1032 mb surface high far to the
northwest will pass about 1100 miles N of the islands mon, giving
a modest uptick in trade wind speeds. The high will then stall
well to the NE of the islands through midweek, with trade wind
speeds relaxing back to locally breezy levels. The models begin to
diverge a bit Thu night with the placement of a low developing to
the N of the islands, though the new 12z ECMWF is closer to the
12z GFS solution than previous runs were. This continues to
suggest a one day period of light winds with diurnal island
circulations taking over for late Thursday night into Friday. The
low will push a late season cold front down the chain Friday night
into Saturday, with cool dry northerlies for next weekend as it
looks right now.

We are within a relatively dry zone as yesterday's trade wind
shower area departs to the west. Not even expecting a lot of
windward and mauka showers today and tonight, though it's
difficult to rule them out completely. The high clouds from the
subtropical jet appear to have thinned quite a bit, and now are
expected to continue to diminish. A little more low-level trade
wind moisture returns on mon, with the models showing a more
robust push of trade wind moisture arriving on tue. This will be
followed by yet another later Wed into Wed night. None of these
areas of trade wind clouds and showers will be accompanied by
significant upper level support so only minor ups and downs in the
shower coverage are expected. The same is true for the cold front
next weekend, which is likely to have a band of clouds and
showers with it, but should not be too heavy.

Aviation
Pretty much fair weather across the main hawaiian islands this
morning. Airmet sierra for mountain obscuration was lowered a
little while ago after visual satellite imagery reveal minor
cloudiness hugging the mountain areas of all the larger islands.

This is despite a low ceiling reported by a few windward stations.

Perhaps windward kauai has the most clouds, but there aren't much
showers with these clouds. Not much trade showers actually, all
around, as a pocket of a drier air mass has descended on the
islands. This drier pattern should persist into the early evening
hours, followed by a generous increase in activity after midnight.

But, the area with the most significant change today will likely
be the kona and kau slopes, where daytime heating, will lead to
mostly cloudy skies and a couple of showers this afternoon and
evening. A stray shower may linger along the kona coast well into
the nighttime hours. MAX top of the trade wind clouds is expected
to be around 9k feet.

High above the island sky is a layer of lumpy looking cirrus
moving thru the area from west to east, especially east of kauai.

A 1029 mb surface high, located about a thousand miles NW of kauai
will be moving E 30 kt, which puts it directly N of the islands
this time Monday morning. This will beef up the trades a little
more area wide tonight and into Monday. Thus, airmet tango will
continue pretty much for at least the next 24 hours.

Marine
Fresh to strong trades are forecast to hold through much of the
upcoming week as high pressure remains established to the north.

A small craft advisory (sca) is currently in place for most
marine areas from oahu to the big island through tonight. The
advisory for the typically windier locations from maui to the big
island has been extended through Tuesday. Other marine zones may
become added Monday through Tuesday as the high strengthens and a
moderate northwest swell builds down the island chain boosting
seas up to around the 10 ft mark.

Rough surf is forecast to persist through the week along east facing
shores due to fresh to strong trades holding in place locally and
just upstream of the area. The best chance for advisory-level surf
will come Tuesday through Thursday as the trades increase locally
and expand farther upstream. Although confidence remains low this
far out in the forecast, there could be a break in the trades by
Thursday Friday as a front approaches and moves into the area.

A new northwest (320 deg) swell is expected to begin slowly
filling in by this evening, peak Monday, then slowly ease through
midweek. This source is from a potent system that reached storm-
force category Friday as it crossed the date line just south of
the aleutians between 40n and 50n (around 2000 miles northwest of
the state). Surf is forecast to peak on Monday at heights below
advisory levels along north and west facing shores.

A reinforcing moderate northwest (330 deg) swell is forecast to fill
in Thursday, peak Thursday night into Friday, then ease into the
weekend. This reinforcement will be from a developing storm that is
currently near the kamchatka peninsula and forecast to track east
while skirting the aleutian islands Sunday through Wednesday.

Surf associated with this feature should remain below advisory
levels along north and west facing shores.

A reinforcing southwest (220 deg) swell is forecast to fill in
Monday and hold through midweek due to recent activity across the
southern pacific tasman sea. Small to moderate surf will result
along south facing shores each day.

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

Small craft advisory until 6 am hst Monday for oahu leeward
waters-kaiwi channel-maui county windward waters-maui county
leeward waters.

R ballard lau foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi47 min NE 12 G 22 76°F 77°F1018.3 hPa
51205 18 mi29 min 76°F8 ft
51202 - Mokapu Point, HI (098) 66 mi55 min 75°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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NE16
NE17
G21
NE16
G21
NE21
NE16
G23
NE13
G22
NE12
G18
NE17
G24
NE16
G20
NE13
G19
E9
G16
NE15
G19
NE5
NE17
G22
NE11
G19
NE12
G17
NE16
G20
NE12
G15
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G20
NE18
G22
NE11
G14
NE8
G12
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NE19
G27
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NE15
G21
NE19
G25
NE18
G23
NE13
G21
NE20
G25
NE20
NE18
G22
NE13
G18
N15
NE14
NE9
G12
NE10
G15
NE11
G14
NE9
G12
NE11
G15
NE11
G15
NE10
G14
NE8
N12
N12
G15
NE11
G14
N12
NE14
G17
NE18
G22
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ago
NE16
G20
NE14
G17
NE16
G22
NE16
G22
NE17
G21
NE13
G17
NE13
G18
NE11
G17
E10
G15
NE13
NE3
G6
NE11
G15
NE12
G15
E6
G14
NE10
G16
NE18
G24
NE14
G19
N9
G12
N15
NE8
G14
NE15
G20
NE11
G14
NE13
G20
NE15
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi74 minNNE 13 G 2310.00 miMostly Cloudy79°F71°F79%1018.6 hPa
Kahului, Kahului Airport, HI14 mi65 minENE 18 G 2810.00 miA Few Clouds and Breezy83°F66°F59%1018.6 hPa
Lanai City, Lanai Airport, HI15 mi63 minW 810.00 miMostly Cloudy74°F64°F74%1018.4 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE14NE13NE14NE10NE10
G20
NE13------------------------NE10NE8NE13NE14NE13
G23
NE14
G25
1 day agoNE16
G21
E12
G23
NE12
G20
NE15
G22
NE15
G24
NE8
G21
------------------------NE12N13NE12NE12
G23
N12
G22
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G24
2 days agoNE12
G16
NE10NE11
G15
NE13NE10N14
G18
------------------------E5NE5NE13
G16
NE12
G19
NE17
G22
NE19
G24

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
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Sun -- 12:47 AM HST     Moonset
Sun -- 04:49 AM HST     0.12 feet Low Tide
Sun -- 06:02 AM HST     Sunrise
Sun -- 10:13 AM HST     0.71 feet High Tide
Sun -- 11:46 AM HST     First Quarter
Sun -- 12:14 PM HST     Moonrise
Sun -- 02:32 PM HST     0.32 feet Low Tide
Sun -- 06:48 PM HST     Sunset
Sun -- 10:11 PM HST     1.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.410.60.30.20.10.20.30.50.60.70.70.60.40.30.30.40.60.91.31.61.821.9

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sun -- 12:46 AM HST     Moonset
Sun -- 06:01 AM HST     Sunrise
Sun -- 11:46 AM HST     First Quarter
Sun -- 12:13 PM HST     Moonrise
Sun -- 01:04 PM HST     0.21 feet Low Tide
Sun -- 06:47 PM HST     Sunset
Sun -- 09:44 PM HST     2.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.210.90.80.80.70.70.70.60.50.40.30.20.20.40.60.91.21.61.8221.9

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.
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Wind Forecast for (17,4,5,8)
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Ground Weather Radar Station Molokai, 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.