Monday, September16, 2019 L-36.com


Marine Weather and Tides
Launiupoko, HI

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:12AMSunset 6:29PM Monday September 16, 2019 12:13 PM HST (22:13 UTC) Moonrise 8:25PMMoonset 8:18AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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- 904 Am Hst Mon Sep 16 2019
.small craft advisory in effect through late this afternoon...
Rest of today..North winds to 25 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Tonight..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the evening.
Tuesday..North winds 20 knots. Wind waves 2 feet or less.
Tuesday night..North winds 20 knots. Wind waves 2 feet or less.
Wednesday..North winds 20 knots. Wind waves 2 feet or less.
Wednesday night..North winds 15 knots. Wind waves 2 feet or less.
Thursday..North winds 20 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less.
PHZ100 904 Am Hst Mon Sep 16 2019
Synopsis for hawaiian coastal waters.. A ridge of high pressure will remain far north of the islands through the week. Meanwhile to the west of the state, a low pressure system is expected to track south to north towards the middle of the week.


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 161959
afdhfo
area forecast discussion
national weather service honolulu hi
959 am hst Mon sep 16 2019

Synopsis
Moist and unstable conditions associated with an upper disturbance
and surface trough of low pressure in the vicinity of the islands
will keep the potential for heavy showers in the forecast through
this evening. A return of drier air and more stable conditions is
anticipated from east to west Tuesday through the second half of
the week. Increasing moisture and rain chances will become a
possibility once again over the upcoming weekend.

Discussion
At the surface, a 1026 mb high is centered about 1400 miles north
of hawaii. A passing trough to the north between the islands and
the high is allowing for the otherwise moderate to fresh trade
winds to veer east southeasterly across the smaller islands this
morning.

Water vapor imagery shows an mid to upper low centered about 400
miles north northwest of hawaii that will gradually be lifting
northwest over the next day or so. Southwest winds along the
eastern flank of the low is currently drawing scattered to broken
midlevel clouds across the central and eastern parts of the state
as shown on visible satellite. A few low clouds are anchoring
along the windward slopes as well. Mimic total precipitable water
(pw) shows a swath of pw near 2 inches across the state and 12z
soundings show a weak inversion. Dew points are mainly in the
upper 60s to low 70s at the sea level observation stations.

The upper low will keep conditions unstable today, especially
across the western half of the state. Localized sea breezes may
set up leeward and along the northwest coasts allowing for clouds
and showers to develop this afternoon into the early evening
similar to yesterday. Can't rule out a few of these showers
becoming heavy at times. Conditions will gradually begin to
improve over the eastern end of the state by late tonight into
Tuesday, as drier air and more stable conditions move in from the
east.

Guidance remains in decent agreement Tuesday night through the
second half of the week and reflects a return of drier and more
stable conditions statewide. The low-level flow (up to 10,000 ft)
is forecast to shift back to a more typical easterly direction
and strengthen. Model pws should drop back to and around normal
through this period. Clouds and showers will focus over windward
and mountain areas, especially through the overnight and early
morning periods as pockets of higher moisture move through from
east to west.

Despite some differences between the various model solutions, a
return of light winds and increasing moisture (two inch pws) will be
possible next weekend as a trough associated with a tropical
disturbance to the south moves through. Added instability
associated with an upper low setting up over the state combined
with this moisture will support increasing rainfall chances.

Aviation
Elevated moisture will keep low clouds and showers around for
today and into the overnight hours. Brief periods of MVFR
conditions are possible, particularly for windward areas. Winds
are in the light to moderate category out of the east-southeast. A
drying trend with increasing trades is on tap as we head into
Tuesday thanks to the upper low north of kauai moving away from
the state.

Airmet zulu remains in effect for light icing 160-fl280.

Marine
High pressure far north of the state is expected to strengthen
slightly and slowly move east through the week. This will lead to
moderate to locally strong easterly trades through most of this
week. Winds may veer to the southeast across the far western
hawaiian waters near the middle of the week as a low pressure
system tracks south to north, west of the state. The small craft
advisory (sca) remains in effect for waters around maui and the
big island through this afternoon. We will continue to monitor the
winds today to see if the SCA needs to be extended. Nonetheless,
borderline SCA level winds are expected for Monday night into
Tuesday.

A series of small swells from the southwest, south, and southeast
is expected this week. The largest of these swells looks to be
towards the end of the week as a combination of a long-period
south-southwest swell and potential short-period southwest swell
moves in across the area. Surf heights are expected to be below
advisory levels with these swells.

Small surf is expected along north, east and west facing shores
through the new week. Expect a small east swell from tropical
cyclone kiko as early as Wednesday along exposed east facing
shores and likely continuing through the weekend. Exposed west
shores may see some of the aforementioned southwest swell on
Friday. A small northwest swell will be possible late in the
weekend into early next week.

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

Discussion... Foster
aviation... Dye
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 12 mi79 min N 8.9 G 14 84°F 1012.8 hPa
51213 18 mi73 min 84°F4 ft
51202 - Mokapu Point, HI (098) 66 mi73 min 82°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI12 mi23 minSW 615.00 miA Few Clouds86°F69°F59%1013.2 hPa
Kahului, Kahului Airport, HI14 mi19 minENE 1110.00 miPartly Cloudy92°F66°F44%1012.3 hPa
Lanai City, Lanai Airport, HI15 mi17 minW 910.00 miPartly Cloudy82°F70°F67%1013.2 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrW7N7NE10NE12----W4--------------------------Calm3NE7
G14
Calm
1 day agoE10NE10E6NE10--------------------------------CalmCalmNE7Calm
2 days agoNE15N14
G20
N8NE8NE8--NE12--------------------------SE7CalmCalmS5

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
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Mon -- 04:44 AM HST     1.82 feet High Tide
Mon -- 06:14 AM HST     Sunrise
Mon -- 08:18 AM HST     Moonset
Mon -- 10:39 AM HST     0.59 feet Low Tide
Mon -- 04:42 PM HST     1.79 feet High Tide
Mon -- 06:28 PM HST     Sunset
Mon -- 08:24 PM HST     Moonrise
Mon -- 10:52 PM HST     0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.91.31.61.81.81.71.41.10.80.60.60.711.31.61.71.81.61.410.70.50.4

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 03:27 AM HST     2.08 feet High Tide
Mon -- 06:13 AM HST     Sunrise
Mon -- 08:18 AM HST     Moonset
Mon -- 09:24 AM HST     0.51 feet Low Tide
Mon -- 03:29 PM HST     2.18 feet High Tide
Mon -- 06:27 PM HST     Sunset
Mon -- 08:23 PM HST     Moonrise
Mon -- 09:47 PM HST     0.35 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.51.82.121.81.51.10.70.50.60.81.21.61.92.22.11.91.51.10.70.40.40.5

Weather Map
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wmap_P
GEOS 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

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Wind Forecast for (18,4,5,8)
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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.