Saturday, February17, 2018 L-36.com


Marine Weather and Tides
Maalaea, HI

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:52AMSunset 6:26PM Saturday February 17, 2018 4:46 PM HST (02:46 UTC) Moonrise 8:16AMMoonset 8:20PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 323 Pm Hst Sat Feb 17 2018
Tonight..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered heavy showers and isolated Thunderstorms.
Sunday..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze through the day. Isolated Thunderstorms in the morning. Scattered heavy showers through the day. Scattered Thunderstorms in the afternoon.
Sunday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered heavy showers and Thunderstorms.
Monday..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered heavy showers and Thunderstorms.
Monday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered showers.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered showers.
Tuesday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Haze. Scattered showers.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers.
Thursday..North winds 20 knots in the morning becoming variable less than 10 knots, then becoming east 10 knots in the evening becoming variable less than 10 knots. Wind waves 3 feet.
PHZ100 323 Pm Hst Sat Feb 17 2018
Synopsis for hawaiian coastal waters.. An upper low will bring the chance of Thunderstorms and heavy rain through Monday. A surface trough near the big island will move slowly west over the weekend bringing moderate southeast winds east of the trough and northeast winds to the west.

7 Day Forecast for Marine Location Near Maalaea, HI
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location: 20.78, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 180139
afdhfo
area forecast discussion
national weather service honolulu hi
339 pm hst Sat feb 17 2018

Synopsis
Moist and unstable conditions will spread across the entire state
overnight and Sunday as a strong upper level trough approaches
and a weak surface trough currently near maui drifts westward. The
resulting unstable conditions will bring a threat of heavy,
flooding rainfall and thunderstorms through the Monday holiday. A
somewhat wet, though more stable, southeasterly flow will likely
develop by Tuesday.

Discussion
Moist and unstable conditions are in place across the eastern half
of the state this afternoon. The afternoon hilo sounding, recent
aircraft data from kona and kahului, and satellite imagery show no
inversion and ample precipitable water (pw) values of 1.25 to 2
inches. Persistent clusters of thunderstorms have been pulsing
around maui and the big island through much of the day, and a few
brief thunderstorms have flared across maui county this
afternoon. That said, conditions remain ripe for heavy rainfall
over the entire eastern half of the state, and a flash flood watch
remains in effect, as well as a winter weather advisory for the
high summits of the big island.

Rather dry conditions have managed to hang on over the western
half of the island chain so far today, though instability is
increasing. Recent aircraft data out of hnl and lihue and
satellite imagery showed the low level inversion eroding and
precipitable water values creeping up. As the upper level trough
advances, we could see an isolated heavy shower or thunderstorm
pop off this afternoon.

Moist and unstable conditions will spread to the entire island
chain tonight and Sunday. The approaching upper level trough will
wipe out the inversion everywhere this evening, and later tonight,
500 mb temps will drop to -13 to -16c, leading to mid level lapse
rates greater than 7c km. Meanwhile, the surface trough and
associated moisture currently over the eastern half of the state
will spread westward. As a result, the flash flood watch that
was already in effect for maui and the big island has been
expanded to all islands, and the winter weather advisory for the
big island summits will continue. In addition, we will have to
monitor the potential for strong thunderstorms capable of
generating hail and gusty winds.

The threat for heavy showers and thunderstorms is expected to
continue into the Monday holiday. The GFS and ECMWF models both
show a compact upper level low developing just southwest of kauai
Sunday night then swinging over the islands on Monday. Although
500 mb temperatures will be on an upward trend, significant
instability will persist and will be easily strong enough to
support thunderstorms. The models are in fairly good agreement in
showing a sharpening of the surface trough over the western end
of the island chain during this time. While this could shift the
focus of heavy showers to a zone of convergence to the northeast
of the state, there should still be enough moisture to trigger
heavy showers and thunderstorms over the islands, especially
during the afternoon hours.

The upper level trough lifts to the northeast on Tuesday,
allowing the atmosphere to become more stable through midweek.

East to southeast winds and lingering shower activity is expected.

Aviation
A surface trough near maui will move slowly westward this
evening. The airmass over the state will become increasingly moist
and unstable. Thick layered clouds and embedded heavier showers
will linger over the big island and waters south of maui will
spread north and westward covering the remainder of the state by
morning. Isolated thunderstorms over the eastern half of the state
this afternoon will spread as far west as oahu by late this
evening. Airmet sierra for tempo mountain obscuration along
eastern exposures of the big island and maui may need to be
expanded this evening to include molokai and oahu.

Marine
An upper low will bring the chance of thunderstorms and heavy
rain through Monday. A surface trough near maui will move slowly
west over the weekend bringing moderate southeast winds east of
the trough and northeast winds to the west. East to southeast
winds will prevail next week.

A series of small west-northwest swells are expected over the
next few days with resultant surf remaining below advisory
levels. A longer period swell is expected Tuesday night which
will produce near advisory level surf Wednesday. High pressure in
the east pacific will send a short period swell into east facing
shores starting Monday. This could produce advisory level surf
along east facing shores next week.

See the oahu surf discussion (srdhfo) for additional details on
surf and swell.

Hfo watches warnings advisories
Flash flood watch from 6 pm hst this evening through Monday
afternoon for niihau, kauai, oahu, molokai, lanai, and kahoolawe.

Flash flood watch through Monday afternoon for maui and the big
island.

Winter weather advisory until 6 pm hst Monday for big island
summits.

Discussion... Wroe
aviation... Bedal
marine... Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 8 mi47 min NNE 8.9 G 9.9 74°F 78°F1012.6 hPa (-0.4)
51205 17 mi47 min 76°F6 ft
51202 - Mokapu Point, HI (098) 78 mi43 min 74°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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NE7
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S18
G24
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G31
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G17
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NE6
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N20
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NW7
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G14

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi53 minNE 1110.00 miMostly Cloudy76°F70°F82%1012.9 hPa
Lahaina - West Maui, HI19 mi62 minN 715.00 miMostly Cloudy75°F71°F89%1013.5 hPa

Wind History from HOG (wind in knots)
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Last 24hrN5NE3NW7NW43SE4S3CalmSW3SE3CalmCalmCalmCalmN7N4N11N11N9N9N8NE9NE7NE11
1 day agoE4E7NE10NE4NE6CalmCalmN3CalmS4S3S3SE3CalmSE5CalmCalmN4CalmN66N7NW8N7
2 days agoS25
G33
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N8N20
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N13N16
G24
N15E12
G16

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
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Sat -- 05:14 AM HST     2.14 feet High Tide
Sat -- 06:54 AM HST     Sunrise
Sat -- 08:15 AM HST     Moonrise
Sat -- 11:37 AM HST     0.06 feet Low Tide
Sat -- 05:41 PM HST     1.34 feet High Tide
Sat -- 06:25 PM HST     Sunset
Sat -- 08:20 PM HST     Moonset
Sat -- 11:06 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.71.21.722.12.11.81.30.80.40.10.10.20.50.81.11.31.31.20.90.60.30.1

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sat -- 03:42 AM HST     2.41 feet High Tide
Sat -- 06:54 AM HST     Sunrise
Sat -- 08:15 AM HST     Moonrise
Sat -- 10:03 AM HST     0.34 feet Low Tide
Sat -- 03:27 PM HST     1.57 feet High Tide
Sat -- 06:25 PM HST     Sunset
Sat -- 08:20 PM HST     Moonset
Sat -- 09:25 PM HST     -0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.522.32.42.21.81.30.80.50.30.40.71.11.41.61.51.310.50.2-0.1-00.2

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 (21,6,7,8)
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Ground Weather Radar Station Kohala, 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.