Monday, August21, 2017 L-36.com


Marine Weather and Tides
Maunaloa, 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 6:10AMSunset 6:56PM Monday August 21, 2017 7:59 AM HST (17:59 UTC) Moonrise 6:08AMMoonset 7:11PM Illumination 0% Phase: New Moon; Moon at 29 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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PHZ116 Kaiwi Channel- 306 Am Hst Mon Aug 21 2017
Today..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Scattered showers in the morning, then heavy showers likely in the afternoon.
Tonight..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Slight chance of Thunderstorms in the evening. Scattered heavy showers through the night.
Tuesday..East winds 20 knots. Wind waves 6 feet. SWell east 3 feet. Scattered heavy showers.
Tuesday night..East winds 20 knots. Wind waves 6 feet. SWell east 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..East winds 20 knots. Wind waves 7 feet. SWell east 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 20 knots. Wind waves 7 feet. SWell east 4 feet. Isolated showers after midnight.
Thursday..East winds 20 knots. Wind waves 7 feet. SWell east 4 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 5 to 6 feet. SWell east 3 to 4 feet. Isolated showers.
PHZ100 306 Am Hst Mon Aug 21 2017
Synopsis for hawaiian coastal waters.. A surface high will remain far northeast of the area and weaken through Tuesday. A new surface high will build far north of the area today. A low aloft will pass to the north and west of kauai through Tuesday.

7 Day Forecast for Marine Location Near Maunaloa, HI
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location: 21.1, -157.2     debug


Area Discussion for -
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Fxhw60 phfo 211326
afdhfo
area forecast discussion
national weather service honolulu hi
326 am hst Mon aug 21 2017

Synopsis
Increasing moisture combined with an upper disturbance over the
region will support heavy showers and a few thunderstorms through
Tuesday. Drier and windier conditions will return Wednesday through
the second half of the week as the ridge strengthens to our north
and the upper disturbance shifts away from the region.

Discussion
Recently animated water vapor loop showed plenty of middle- to upper-
level moisture streaming northward over the islands due to a broad
upper low drifting southwestward just north of kauai. This upper low
combined with a sufficient amount of instability and moisture will
keep the chance of heavy rain and thunderstorms in the forecast
through Tuesday. The early morning upper air sounding at lihue
reflected this instability and depicted a relatively steep mid-level
lapse rate with -9c at 500 mb. The latest satellite-derived
precipitable water (pw) imagery showed values ranging from 1.5-2"
over and around the islands, which is above normal for this time of
year. As a result, localized flooding will remain a concern
through Tuesday, mainly where the heavy showers become focused.

Some of this activity will become focused over the leeward areas
through the afternoon and early evening periods where sea breezes
develop.

For the extended period, the GFS and ECMWF both depict breezy trades
and drier conditions returning across the state beginning Wednesday
as the upper low shifts away from the region and high pressure
builds north of the state. Model pws support this and dip back down
to below average for this time of year (near 1"). Showers will
remain focused over windward and mauka areas each day.

Aviation
Surface high pressure to the north will maintain moderate east
northeast surface winds across the area. These winds will carry
very moist air over the area. A low aloft 150 nm north northwest of
kauai is forecast to move south southwest over the next 24 hours,
then move off to the northwest. The low aloft will make the atmosphere
unstable.

Vfr conditions
prevail over southwest sections of all the islands this morning, but
tempo MVFR and isol ifr conditions are expected over northeast sections
of maui, molokai and oahu. Airmet sierra is currently in effect for
mtn obsc over the northeast section of maui. Mtn obsc is expected to
spread to the northeast sections of molokai and oahu before sunrise.

Thunderstorms may develop again over land as the islands heat up today.

Marine
Winds are expected to remain in the moderate to fresh range
through tonight, then strengthen into the fresh to locally strong
category Tuesday through the remainder of the week. Increasing
shower coverage will remain in the forecast through Tuesday as an
upper trough drifts southwestward over the region. This upper
trough will also support a slight chance of thunderstorms through
Tuesday. Drier conditions will return Wednesday through the second
half of the week.

Surf will remain generally small all around. Small background
long-period pulses from the south-southwest (210-220 deg) and
south- southeast (130-160 deg) will keep the surf from being flat
along south facing shores this week. A slightly larger south-
southwest (220 deg) swell will be possible this coming weekend due
to a recent gale over the tasman sea.

Surf along east facing shores will remain generally small through
tonight, then build Tuesday through the rest of the week as
stronger trades return. Additionally, a long-period swell
associated with tropical activity across the eastern pacific will
be possible Wednesday through Friday, especially along the exposed
beaches of the big island.

Expect higher than normal water levels due to a combination of an
oceanic eddy moving through from east to west and the regular
king tide cycles. Water levels will slowly lower each day through
the week. Please refer to the special weather statement for more
details.

Hfo watches warnings advisories
None.

Discussion... Gibbs
aviation... Donaldson
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51202 - Mokapu Point, HI (098) 33 mi55 min 80°F4 ft
OOUH1 - 1612340 - Honolulu, HI 38 mi41 min N 1 G 1.9 80°F 81°F1016.6 hPa
MOKH1 - 1612480 - Mokuoloe, HI 39 mi83 min E 6 G 8 80°F 82°F1015.8 hPa
51210 39 mi29 min 81°F3 ft
51205 41 mi50 min 80°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 41 mi41 min NE 6 G 8 78°F 81°F1015.5 hPa
51211 42 mi59 min 81°F2 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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G5
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaunakakai, Molokai Airport, HI6 mi65 minNNE 610.00 miFair78°F72°F82%1015.8 hPa

Wind History from HMK (wind in knots)
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1 day agoN8
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NE7NE5NE10NE6NE7NE5N6NE9
2 days agoNE11NE10NE10
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Calm3E12N5NE7N4NE4NE7

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Mon -- 03:48 AM HST     1.22 feet High Tide
Mon -- 06:08 AM HST     Moonrise
Mon -- 06:09 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 09:19 AM HST     0.06 feet Low Tide
Mon -- 04:15 PM HST     2.34 feet High Tide
Mon -- 06:53 PM HST     Sunset
Mon -- 07:11 PM HST     Moonset
Mon -- 10:57 PM HST     0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.711.21.21.10.80.50.20.10.10.40.81.31.82.12.32.321.510.60.30.2

Tide / Current Tables for Kaunakakai, Molokai (Hawaii)
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Kaunakakai
Click for Map
Mon -- 03:41 AM HST     1.27 feet High Tide
Mon -- 06:07 AM HST     Moonrise
Mon -- 06:08 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 09:14 AM HST     0.04 feet Low Tide
Mon -- 04:08 PM HST     2.42 feet High Tide
Mon -- 06:53 PM HST     Sunset
Mon -- 07:10 PM HST     Moonset
Mon -- 10:52 PM HST     0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.711.21.31.10.80.50.200.10.40.81.41.92.32.42.321.510.50.30.2

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 (13,3,4,5)
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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.