Friday, March24, 2017 L-36.com


Marine Weather and Tides
Paia, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:24AMSunset 6:39PM Thursday March 23, 2017 8:10 PM HST (06:10 UTC) Moonrise 3:17AMMoonset 2:49PM Illumination 12% Phase: Waning Crescent; Moon at 26 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- 338 Pm Hst Thu Mar 23 2017
Tonight..North winds 20 kt. Wind waves 2 ft or less.
Friday..North winds 20 kt. Wind waves 2 ft or less.
Friday night..Northeast winds to 25 kt. Wind waves 2 ft or less.
Saturday..North winds to 25 kt. Wind waves 2 ft or less then 3 ft in the afternoon.
Saturday night..North winds to 25 kt. Wind waves 3 ft.
Sunday..North winds to 25 kt. Wind waves 3 ft.
Sunday night..North winds to 25 kt. Wind waves 3 ft.
Monday..North winds to 25 kt. Wind waves 3 ft.
Tuesday..North winds to 25 kt. Wind waves 6 ft.
PHZ100 338 Pm Hst Thu Mar 23 2017
Synopsis for hawaiian coastal waters.. A ridge north of the state will weaken tonight and Friday. A new high will build north of the area and shift eastward and will produce moderate to locally strong trade winds this weekend and early next week. A very large west northwest swell will affect the area beginning Saturday.

7 Day Forecast for Marine Location Near Paia, HI
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location: 20.9, -156.36     debug


Area Discussion for -
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Fxhw60 phfo 240150
afdhfo
area forecast discussion
national weather service honolulu hi
350 pm hst Thu mar 23 2017

Synopsis
A trade wind regime is here and will continue through at least the
upcoming weekend. Showers riding in with the trades will favor the
windward and mountain areas, especially the night and morning
hours. The strength of the trades will be increasing Friday to
moderate to locally strong speeds, and this pattern will hold
through at least the early part of next week.

Discussion
The clouds and showers from an old front continue to harass most
of maui island and windward big island this afternoon. Meanwhile
kauai is generally sunny with some interior cloudiness and may be
an isolated shower or two. Oahu cleared up nicely, but there are
a few spotty localized clouds and an isolated showers over the
leeward areas of the island. Broken to overcast low clouds also
covered the koolau's and windward areas. Skies are mainly partly
cloudy across molokai and lanai and dry. And as noted, most of
maui is cloudy with some scattered windward showers. Likewise for
windward big island with some clouds and scattered upslope
showers.

Satellite imagery shows the back end of a field of cirrus over
west maui. The cirrus should be east of the big island by midnight
tonight.

Satellite imagery also show a shower area closing on CAPE kumukahi
of the big island. The pops have been bumped up to likely for windward
big island tonight. And expect this shower area to spread westward
this evening to maui and molokai and to oahu after midnight. Both
the ECMWF and GFS agree on a wet night ahead for these islands.

Kauai will likely remain dry through at least the first half of
the night. A sliver of clouds and showers may reach kauai around
day break Friday but we will see. The models differ on the pops
for Friday with the ec being wetter than the GFS which clears out
most of the elements. We kept in a low end chance of a shower for
Friday afternoon for the windward and mountain areas. The ec
matches up with the GFS for a relatively dry Friday evening. The
rest of the forecast to Tuesday calls for more of the scattered
trade showers variety mainly during the nights and mornings
favoring the islands windward and mountain sections.

The strength of the trade winds will be held down for another 12
to 18 hours to until a front about 440 miles N of kauai moves n
and away from the islands. The models are banking on the locally
strong trades to begin easing in Friday afternoon where the
waters W and S of the big island will first feel it. Locally
strong trades then spreads over to nearby maui county Friday.

A new surface high is forecast to form north of the islands
Saturday night. This new high will then assume control of the
trades supplying the islands lasting through Monday of next week.

In brief, strongest trades will be over the eastern part of the
island chain and lightest over the kauai end.

Thereafter, about the Monday night time frame, both the ec and
gfs shows a temporarily break down in the moderate to locally
strong trade wind flow. The GFS is showing a front NW of kauai as
the culprit to the lighter trades.

Aviation
Low clouds from an old frontal boundary are embedded within
prevailing easterly flow, providing occasional MVFR ceilings along
windward slopes of molokai, maui and the big island.VFR
conditions dominate elsewhere. Airmet sierra is in effect for
mountain obscuration across north and east sections of maui above
2500 feet, and may persist through most of tonight as a new
area of clouds and showers spreads westward from the big island.

No other airmets are in effect.

Marine
A surface high is currently located far east northeast of the state
with a surface ridge trailing west to about 200 nm north of kauai.

As the high weakens tonight, so will the ridge. However, a new
high will set up to the northeast and strengthen starting Friday
afternoon and night. Winds are forecast to reach small craft
advisory (sca) strength by Friday afternoon or Friday night for
the typical windy areas around maui county and the big island.

Trade winds will strengthen further this weekend boosting wind
speeds to moderate to locally strong over the coastal waters as
redevelops to the north and strengthens.

A strong low pressure system currently about 2100 miles northwest
of hawaii will bring a very large west-northwest swell that will
build across the state Saturday and Saturday night. Surf along
most north and west facing shores will peak at high end advisory
or warning level heights. Surf will be the largest on kauai and
niihau, and slightly lower over the rest of the islands due to
some blockage caused by kauai and niihau. Rough and choppy
conditions will persist along east facing shores due to the
strengthening trade winds this weekend.

The SCA will need to be expanded this weekend for the incoming
swell and strengthening trade winds.

Hfo watches/warnings/advisories
None.

Discussion... Lau
aviation... Powell
marine... Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 6 mi41 min NE 11 G 17 76°F 78°F1019.5 hPa
51205 9 mi32 min 77°F5 ft
51203 - Kaumalapau, HI (146) 35 mi26 min 78°F3 ft
51202 - Mokapu Point, HI (098) 78 mi37 min 77°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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W6
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NE3
G6
NE7
G16
NE11
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G20
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NE12
G16
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NE17
NE14
G18
NE9
G15
NE9
G12
NE11
G15
NE13
G18
NE12
G20
N12
G16
NE5
G9
NE14
G20
SE2
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NE8
G11
NW3
NW3
G7
NE16
G21
NE18
G22
NE15
G20
NE13
G18
NE13
G24
NE9
G13
NE8
G11
W6
W8
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NE10
G14
NE11
G17
NE15
NE15
G19
NE13
G19
NE15
G20
NE16
G22
NE14
G19
NE13
G22
NE16
G21
NE16
G22
NE15
G23
NE17
G25
NE17
G23
NE13
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI4 mi17 minENE 1010.00 miPartly Cloudy75°F69°F82%1019.9 hPa
Lahaina - West Maui, HI17 mi4.4 hrsN 15 G 2415.00 miShowers in Vicinity81°F68°F66%1018.3 hPa

Wind History from HOG (wind in knots)
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Last 24hrE5CalmNE3SE7CalmSE6W3S4SE5S6E7SE4E8NE14E15
G21
NE12
G19
E16
G24
NE15
G22
NE14NE14NE15
G20
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NE7
G17
E10
1 day agoNE14
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NE9NE7E8NE9N12CalmE11E3S6Calm3S7E12
G20
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G17
NE11W6W7Calm
2 days agoNE9NE9NE12NE10NE13NE11NE12NE7NE12
G21
NE9NE11NE12
G19
SE8
G19
E15
G21
NE14
G25
NE14
G22
NE17
G23
NE17
G25
NE16
G26
NE17
G26
NE17
G29
E15
G24
E11
G19
NE13

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 12:47 AM HST     2.11 feet High Tide
Fri -- 04:02 AM HST     Moonrise
Fri -- 06:25 AM HST     Sunrise
Fri -- 07:18 AM HST     0.44 feet Low Tide
Fri -- 12:31 PM HST     1.33 feet High Tide
Fri -- 03:44 PM HST     Moonset
Fri -- 06:27 PM HST     -0.02 feet Low Tide
Fri -- 06:38 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
22.121.71.30.90.60.40.50.70.91.21.31.31.20.90.50.2-000.20.61.11.6

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Fri -- 01:45 AM HST     2.11 feet High Tide
Fri -- 04:02 AM HST     Moonrise
Fri -- 06:25 AM HST     Sunrise
Fri -- 08:11 AM HST     0.11 feet Low Tide
Fri -- 02:10 PM HST     1.34 feet High Tide
Fri -- 03:44 PM HST     Moonset
Fri -- 06:38 PM HST     Sunset
Fri -- 07:33 PM HST     0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.822.11.91.510.60.20.10.20.40.711.21.31.310.70.30.10.10.30.61.1

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 (2,6,7,8)
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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.