Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Kahaluu, 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 6:58PM Saturday August 19, 2017 10:02 PM HST (08:02 UTC) Moonrise 4:06AMMoonset 5:35PM Illumination 4% Phase: Waning Crescent; Moon at 28 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- 924 Pm Hst Sat Aug 19 2017
Rest of tonight..East winds 20 knots. Wind waves 4 feet. Isolated showers.
Sunday..Northeast winds 15 knots. Wind waves 4 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..East winds 20 knots. Wind waves 5 feet. Showers likely in the evening, then scattered showers after midnight.
Monday..Northeast winds 15 knots. Wind waves 5 feet. Scattered showers.
Monday night..East winds 15 knots. Wind waves 4 feet. Slight chance of Thunderstorms in the evening. Scattered showers through the night.
Tuesday..East winds 15 knots. Wind waves 6 feet. Scattered showers.
Tuesday night..East winds 20 knots. Wind waves 7 feet. Showers likely in the evening, then scattered showers after midnight.
Wednesday..East winds 20 knots. Wind waves 7 to 8 feet. Scattered showers.
Thursday..East winds 20 knots. Wind waves 7 feet. Isolated showers.
PHZ100 924 Pm Hst Sat Aug 19 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 on Monday. A low aloft will track southwest across the region Sunday through Tuesday.

7 Day Forecast for Marine Location Near Kahaluu, HI
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location: 21.46, -157.8     debug


Area Discussion for -
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Fxhw60 phfo 200648
afdhfo
area forecast discussion
national weather service honolulu hi
848 pm hst Sat aug 19 2017

Synopsis
Light to moderate trade winds will prevail through early next
week as a weakened ridge remains to our north. Expect local sea
breezes along with increased afternoon clouds and showers across
leeward areas. Low clouds carried by the trades will continue to
affect windward and mauka areas. Tropical moisture from the east
will increase shower coverage and keep muggy conditions around
through Tuesday. Instability will introduce a slight chance of
thunderstorms Sunday through Tuesday. Drier and windier conditions
will return Wednesday as the ridge strengthens to our north.

Discussion
The subtropical ridge far north of the main hawaiian islands
continues to weaken as upper troughing between 140w and 165w takes
its toll. The ridge is strong enough to drive light to moderate
trade winds across local waters, but we expect trade flow will be
too weak to defeat development of local leeward sea breezes each
afternoon Sunday through Tuesday. Satellite loop shows patchy
broken low clouds embedded within trade flow moving across
windward and mauka areas of the islands, while radar shows
scattered showers across these same areas. Increased low cloud
cover is noted east of about 152w, along the leading edge of an
expected increase in tropical moisture. Afternoon soundings show
either no inversion or one much weaker than at this time
yesterday, another sign of increased troughing aloft. Hilo had
more moisture than lihue, with 1.32 versus 0.98 inches of pw.

Models show the upper trough over and north of the islands will
dig to the southwest through early next week, keeping the ridge
weak and dragging a pool of cold air over the western half of the
chain. Combined with an expected increase in tropical moisture
from the east, this colder air aloft will introduce a slight
chance of thunderstorms to our forecast from Sunday afternoon
through the day Tuesday. This threat will start with the potential
for thunderstorms across leeward portions of the big island Sunday
afternoon, then morph into a broader threat including kauai
and or oahu Sunday night through Monday night. As the pool of cold
air begins to pass west of the islands, the thunderstorm threat
will shrink once again to only leeward portions of the big island
Tuesday afternoon before vanishing altogether.

Outside of the thunderstorm threat, the general weather pattern
Sunday through Tuesday will consist of windward clouds and
showers merging with afternoon and evening leeward clouds and
showers, thanks to the hybrid light trade sea breeze setup. By
Wednesday, the upper trough, with its associated cold air pool,
will be far west of the main islands. This will allow the ridge to
our north to rebound and drive stronger trade winds across local
waters. In short, drier and windier conditions are expected
Wednesday through the rest of the forecast period.

Aviation
Vfr conditions will continue at all TAF sites with brief MVFR
conditions expected mainly for the windward sites this evening.

As an area of enhanced moisture from the east reaches the eastern
islands overnight, MVFR conditions will become more widespread
over windward areas. No airmets are currently in effect but one
may be needed overnight for mountain obscuration over eastern
portions of the state.

Marine
Winds and seas are expected to remain below small craft advisory
levels through early next week as a trough aloft helps weaken the
pressure gradient. The trough may make showers more active, and
could even produce some thunderstorms Sunday through Tuesday.

Wind speeds will increase again later next week.

Surf along south facing shores will continue to lower overnight
as a south-southeast swell that filled in and peaked late Friday
eases. Looking ahead, mainly small background long-period
reinforcing pulses out of the south-southwest (210-220 deg) and
south-southeast (130-160 deg) will keep the surf from going flat
each day along south facing shores. For more detailed surf
information, see the latest collaborative nearshore swell and
wind forecast at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 2 mi87 min ENE 7 G 12 80°F 82°F1015.4 hPa
51210 3 mi33 min 81°F3 ft
51202 - Mokapu Point, HI (098) 7 mi59 min 80°F4 ft
OOUH1 - 1612340 - Honolulu, HI 11 mi51 min NE 1 G 2.9 81°F 81°F1015.8 hPa
51211 14 mi93 min 81°F3 ft
51201 - Waimea Bay, HI (106) 22 mi31 min 79°F3 ft

Wind History for Mokuoloe, HI
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E6
G11
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NE9
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E11
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E7
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G17
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G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi2.1 hrsENE 9 G 167.00 miMostly Cloudy81°F73°F77%1013.5 hPa
Honolulu, Honolulu International Airport, HI10 mi70 minNE 510.00 miPartly Cloudy75°F69°F82%1014.9 hPa
Wheeler Air Force Base / Oahu, HI12 mi65 minNNE 310.00 miOvercast76°F68°F77%1014 hPa
Oahu, Kalaeloa Airport, HI17 mi70 minENE 410.00 miPartly Cloudy80°F68°F67%1016.1 hPa

Wind History from HNG (wind in knots)
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Last 24hrE7
G14
E7--NE8E7E8--E8E8E75NE9E9NE10NE9NE8E7NE11NE7NE9E8NE6NE9
G16
E6
1 day agoE10E9E9E7E4--E10
G18
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NE10E8
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NE7E7NE9NE10NE8NE10
G15
NE9NE8NE10NE9NE8NE9E10
2 days agoE10NE9
G15
E9NE8E9--E7E6--E6E6NE8NE9NE9E10NE8NE9NE9NE11NE10NE10NE11--NE9
G19

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Sun -- 02:53 AM HST     1.07 feet High Tide
Sun -- 05:09 AM HST     Moonrise
Sun -- 06:11 AM HST     Sunrise
Sun -- 08:29 AM HST     -0.13 feet Low Tide
Sun -- 03:31 PM HST     2.42 feet High Tide
Sun -- 06:26 PM HST     Moonset
Sun -- 06:57 PM HST     Sunset
Sun -- 10:19 PM HST     0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.811.110.70.40.1-0.1-0.10.10.61.11.72.12.42.42.11.71.20.70.30.10.1

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Sun -- 01:58 AM HST     1.12 feet High Tide
Sun -- 05:08 AM HST     Moonrise
Sun -- 06:11 AM HST     Sunrise
Sun -- 07:44 AM HST     0.02 feet Low Tide
Sun -- 02:33 PM HST     2.43 feet High Tide
Sun -- 06:25 PM HST     Moonset
Sun -- 06:56 PM HST     Sunset
Sun -- 09:38 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.811.110.80.50.30.100.20.61.11.72.12.42.42.21.81.30.80.40.20.20.4

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 (4,6,7,8)
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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.