Monday, May20, 2019 L-36.com


Marine Weather and Tides
Keokea, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:45AMSunset 6:59PM Monday May 20, 2019 10:41 AM HST (20:41 UTC) Moonrise 9:04PMMoonset 7:26AM Illumination 97% 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- 920 Am Hst Mon May 20 2019
Rest of today..North winds 15 knots. Wind waves 2 feet or less.
Tonight..North winds 15 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Tuesday night..North winds 10 knots. Wind waves 2 feet or less.
Wednesday..North winds 10 knots. Wind waves 2 feet or less.
Wednesday night..North winds 10 knots. Wind waves 2 feet or less.
Thursday..North winds 15 knots veering east. Wind waves 2 feet or less.
Friday..East winds 10 knots. Wind waves 2 feet or less.
PHZ100 920 Am Hst Mon May 20 2019
Synopsis for hawaiian coastal waters.. A surface high northeast of the waters will build northeastward through tonight as a cold front approaches the state from the northwest. The front is expected to stall and dissipate northwest of the island chain Tuesday and Tuesday night, while the high far northeast of the waters strengthens and persists through rest of the week.


7 Day Forecast for Marine Location Near Keokea, HI
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location: 20.67, -156.34     debug


Area Discussion for -
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Fxhw60 phfo 202002
afdhfo
area forecast discussion
national weather service honolulu hi
1002 am hst Mon may 20 2019

Synopsis
Gentle to moderate east southeast winds expected through Friday which
will allow daytime sea breezes and nighttime land breezes to set
up over the islands. Clouds and showers will build each day across
island interior sections and then clear at night. Expect warm and
humid conditions to continue as well. Trade winds are forecast to
return over the memorial day weekend.

Discussion
A 1027 mb surface high is positioned about 1150 miles northeast
of kauai while an approaching front is about 800 miles northwest
of of kauai. The two features will bring gentle to moderate east
southeast wind flow across the state. Because the wind direction
will line up parallel to the island chain, most areas will be
blocked from the wind flow allowing sea breezes along with
interior clouds and showers to set up later today. Winds will then
shift to land breezes tonight with cloud cover and showers
decreasing over the islands. Exceptions to this will be along the
hana and hamakua coastlines which are generally more exposed to
east southeast winds. Both hilo and hana may see stronger than
typical winds from the topographical effects.

The diurnal weather pattern will persist over through much of the
work week with mostly sunny mornings, cloudy afternoons and
clearing at night. Conditions will feel warmer and more humid
under this light wind regime. Rain amounts should be on the light
side, but can't rule out some moderate intensity showers
developing over the island interior sections each afternoon.

An upper level trough will gradually shift closer to the islands
to the west over the next several days, but should not destabilize
our weather. However, we can expect some passing cirrus clouds
moving across the area as the subtropical jet along the eastern
flank of the trough moves on top of the island chain. The front is
expected to stall just west of kauai Tuesday night and then
gradually shift back to northwest during the middle and ending of
the work week. Long range guidance shows trade winds slowly
building in over the memorial day weekend as the front weakens and
dissipates.

Aviation
Expect a mainlyVFR day across the area. A ridge of high pressure
n of kauai will move S today, weakening the trade winds and causing
them to veer to the SE over the smaller islands.

Shower activity is quite light across the islands this morning and
is expected to remain so through this afternoon. High cirrus clouds
continue to stream across the state today as well, ahead of a front
far NW of kauai. With the trades weakening, expect some cloud build-
ups and possible a light shower or two over leeward areas of each
island this afternoon. The coverage of the clouds and showers is
not expected to be extensive to warrant airmet sierra for mountain
obscuration.

Although the low-level winds are weakening, there is enough vertical
speed shear at the mid to high levels, leading to the potential
of tempo moderate turbulence between fl220 and fl300. The turbulence
is expected to dissipate this afternoon.

Marine
High pressure to the northeast of the state will continue to move
to the east as a low moves north of the islands. The low and its
associated cold front will remain north of the islands, but will
ease winds and shift them to the east to southeast near the
islands through tomorrow. The low will move to the north as we
head into the middle of the week, stalling the front to the north
of the islands. This will allow the surface ridge to build back
over the area during the second half of the week, allowing winds
to strengthen and become more easterly.

Surf is expected to remain below advisory levels through the week
for all shores. A series of small southwest and south swells will
produce small to moderate surf along south facing shores through
the middle of the week. The memorial day weekend could advisory
level surf with the arrival of a larger long-period south-
southwest swell.

Small to moderate sized swells will impact the north and west
facing shores into the holiday weekend. Surf along east facing
shores will remain small through the middle of the week. As winds
increase during the second half of the week, we can expect a boost
to surf along east facing shores this weekend.

Hfo watches warnings advisories
None.

Discussion... Foster
aviation... Ts
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 17 mi48 min NE 15 G 17 80°F 1017.1 hPa
51205 24 mi42 min 77°F6 ft
51213 36 mi42 min 80°F3 ft
51202 - Mokapu Point, HI (098) 88 mi42 min 78°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI17 mi48 minVar 610.00 miPartly Cloudy87°F64°F46%1017.3 hPa

Wind History from HOG (wind in knots)
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NE10E9W3S5SE3SE6SE4SW3SE6NW7NE5Calm6
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NE15NE15NE8NE7CalmSE5SE7CalmSE5CalmSE466
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Tide / Current Tables for Makena, Maui Island, Hawaii
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Makena
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Mon -- 04:12 AM HST     0.46 feet High Tide
Mon -- 05:46 AM HST     Sunrise
Mon -- 07:26 AM HST     Moonset
Mon -- 09:37 AM HST     -0.22 feet Low Tide
Mon -- 05:09 PM HST     1.97 feet High Tide
Mon -- 06:57 PM HST     Sunset
Mon -- 09:04 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.30.40.50.40.30.1-0.1-0.2-0.2-0.10.20.71.11.51.821.91.71.30.90.50.3

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Mon -- 04:55 AM HST     0.93 feet High Tide
Mon -- 05:46 AM HST     Sunrise
Mon -- 07:26 AM HST     Moonset
Mon -- 10:10 AM HST     -0.14 feet Low Tide
Mon -- 05:39 PM HST     2.44 feet High Tide
Mon -- 06:58 PM HST     Sunset
Mon -- 09:04 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.50.70.90.90.80.60.30-0.1-0.10.20.71.21.72.12.42.42.21.81.30.80.4

Weather Map and Satellite Images
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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 (16,3,4,5)
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Ground Weather Radar Station Kohala, 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.