Tuesday, April24, 2018 L-36.com


Marine Weather and Tides
Manele, 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 6:03AMSunset 6:55PM Tuesday April 24, 2018 2:21 AM HST (12:21 UTC) Moonrise 2:19PMMoonset 2:34AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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PHZ118 Maui County Leeward Waters- 930 Pm Hst Mon Apr 23 2018
.small craft advisory in effect through early Wednesday morning...
Rest of tonight..Northeast winds to 25 knots. Wind waves 8 feet. Northwest swell 3 feet. Isolated showers through the night.
Tuesday..Northeast winds 20 knots. Wind waves 8 feet. Northwest swell 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Tuesday night..Northeast winds to 25 knots. Wind waves 8 feet. Northwest swell 3 feet. Isolated showers.
Wednesday..Northeast winds 15 knots. Wind waves 7 feet. North swell 3 feet. Isolated showers.
Wednesday night..Northeast winds 15 knots. Wind waves 6 feet. North swell 3 feet. Isolated showers through the night.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. North swell 3 feet. Isolated showers in the morning.
Thursday night..East winds 10 knots. Wind waves 4 feet. North swell 3 feet. Isolated showers in the evening.
Friday..Southeast winds 10 knots in the morning becoming variable less than 10 knots, then becoming northwest 10 knots. Wind waves 3 feet. Northwest swell 4 feet. Haze. Showers likely.
Saturday..Northeast winds 15 knots. Wind waves 4 to 5 feet. Northwest swell 4 to 5 feet. Showers likely.
PHZ100 930 Pm Hst Mon Apr 23 2018
Synopsis for hawaiian coastal waters.. Fresh to strong trade winds will increase slightly as a strong surface high passes north of the islands. Winds will gradually decline Wednesday through Friday as the ridge north of the state weakens. A front is expected to move across the western half of the island chain Friday, then reach the central or eastern end of the state Saturday.

7 Day Forecast for Marine Location Near Manele, HI
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location: 20.67, -157.6     debug


Area Discussion for -
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Fxhw60 phfo 240645
afdhfo
area forecast discussion
national weather service honolulu hi
845 pm hst Mon apr 23 2018

Synopsis
Breezy trades winds will hold through midweek, then begin to weaken
and shift out of the south by late Thursday as a front approaches
from the northwest. Clouds and showers will continue to focus mainly
over windward and mauka areas through midweek. The front is forecast
to push down the island chain Friday and Friday night, then
potentially stall and bring another round of wet weather through the
weekend over portions of the state.

Discussion
The latest surface analysis showed strong high pressure (1034 mb)
centered around a 1000 miles north-northeast of the state and a cold
front extending south-southwest across the north-central pacific to
an area just northwest of midway. Observations depicted breezy
trades holding over the area with gusts reaching the 30 to 40 mph
range over some of the windier locations due to terrain
accelerations. Satellite radar imagery showed mainly low
clouds showers riding in on the trades focusing over windward
locations. A larger batch of clouds was located a couple of hundred
miles east of hilo, which should move into the windward areas of the
big island and maui county through the early morning period Tuesday
and could support a slight uptick in windward shower coverage. The
latest rainfall summary showed minimal accumulations over the past
24 hrs with peak totals coming in over windward maui county and
the big island (near around an inch).

Guidance remains in decent agreement through midweek and is
initializing well with the current pattern and trends. Consensus
supports stable conditions with breezy trades holding as high
pressure passes to the north. Clouds and showers will continue to
focus over windward mauka locations, especially as pockets of
enhanced moisture ride in on the trades. Model precipitable water
(pw) values reflect this and are forecast to hold around normal (1.1-
1.3").

Conditions will begin to evolve through the day Thursday and
Thursday night as the aforementioned front over the north-central
pacific approaches from the northwest. Guidance continues to
advertise a strong shortwave trough digging southeast toward the
region and closing off an upper low Friday through Saturday north of
the state. This upper feature will support strong cyclogenesis
setting up several hundred miles north of the islands with a cold
front advancing down the island chain late Friday through Friday
night. A pre-frontal trough is depicted Thursday night over the
northwest islands, which could correspond to the beginning of
another wet scenario unfolding for the state.

Although uncertainty remain high this far out in the forecast,
the latest guidance depicts this boundary quickly moving through
kauai late Friday and Friday night with northerly winds and drier
air filtering in. This boundary is forecast to then stall at some
point over the central or eastern half of the chain by the end of
the weekend. The upper low combined with this stalling boundary
will draw up 2" plus pws out of the tropics that will support a
continuation of the wet pattern over the eastern end of the state
through the weekend and possibly into early next week.

Aviation
Strong northeast trade winds will produce scattered showers along
windward mountain areas of all islands with isolated showers
possibly drifting to a few leeward spots.VFR conditions across
the state with a few areas of MVFR conditions windward. Airmet
sierra is in effect for tempo mountain obscurations on the
windward side on the big island. Airmet tango is in effect through
this period on the leeward side of the mountains on all islands
due to the strong winds.

Marine
Fresh to strong trade winds will pick up slightly and persist
into Tuesday as strong high pressure currently far north of the
state moves off to the northeast. A small craft advisory (sca)
expands to all hawaiian waters tonight through Tuesday. Winds
will gradually ease Wednesday and Thursday as the ridge north of
the state weakens. The SCA will likely be trimmed back to the
usual windy areas around the big island and maui, then be dropped
completely Friday as a front moves over the state from the
northwest. Look for northerly winds to build behind the front,
but uncertainty in its eventual position means there is low
confidence in the wind forecast for the weekend.

A pair of moderate northwest swells are due during the next
several days, with considerable uncertainty for the weekend. The
current swell has peaked, will drop through Tuesday, and fade
Wednesday. A similarly sized swell will build Thursday and peak
Friday. Uncertainty increases in the swell forecast for the
weekend. The GFS and ECMWF are showing a gale low forming north of
the state between 30n and 40n, but the models continue to lack
agreement in the exact position and strength of the low. There is
the potential for a large, short-period north-northwest swell to
produce surf well above advisory levels.

Rough, moderate surf will hold along east facing shores during the
next few days. Seas should increase slightly tonight and Tuesday,
and resulting surf along east facing shores will approach the
high surf advisory threshold. East shore surf will gradually
decline Thursday and Friday.

Small to occasionally moderate surf is expected along south
facing shores this week. An inconsistent southwest swell will
persist during the next few days. A moderate south-southwest swell
is expected this weekend into early next week.

Hfo watches warnings advisories
Small craft advisory until 6 am hst Wednesday for all hawaiian
waters-
aviation... Chevalier foster
marine... Kinel
rest of discussion... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 46 mi52 min ENE 5.1 G 6 73°F 77°F1017.7 hPa
51211 47 mi52 min 77°F3 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI35 mi26 minNE 1310.00 miFair67°F62°F84%1016.5 hPa

Wind History from HNY (wind in knots)
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Last 24hrNE7E12NE10
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1 day agoNE7E7E4SE3CalmN9--S6W8NE20
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NE23NE13NE13NE14E9NE9NE6NE13NE10
2 days agoNE6N9NE9NE10NE9NE12
G16
NE10S8N8N12
G17
E7NE13NE12SE6S5NE4SW4CalmCalmE3N5E4NE6N9

Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
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Tue -- 02:31 AM HST     Moonset
Tue -- 06:02 AM HST     Sunrise
Tue -- 07:02 AM HST     -0.15 feet Low Tide
Tue -- 01:01 PM HST     1.12 feet High Tide
Tue -- 02:16 PM HST     Moonrise
Tue -- 06:11 PM HST     0.22 feet Low Tide
Tue -- 06:50 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.81.51.10.60.2-0-0.1-0.10.20.50.811.110.80.60.30.20.30.50.81.21.6

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Tue -- 02:32 AM HST     Moonset
Tue -- 06:02 AM HST     Sunrise
Tue -- 07:03 AM HST     -0.14 feet Low Tide
Tue -- 01:09 PM HST     0.90 feet High Tide
Tue -- 02:16 PM HST     Moonrise
Tue -- 06:12 PM HST     0.25 feet Low Tide
Tue -- 06:51 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.61.310.60.2-0.1-0.1-0.10.10.40.60.80.90.90.70.50.30.20.30.50.71.11.4

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (8,2,3,4)
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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.