Sunday, November19, 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 6:43AMSunset 5:49PM Saturday November 18, 2017 10:52 PM HST (08:52 UTC) Moonrise 6:56AMMoonset 6:25PM Illumination 0% Phase: New Moon; Moon at 1 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- 934 Pm Hst Sat Nov 18 2017
.small craft advisory in effect from Sunday morning through Monday afternoon...
Rest of tonight..North winds 15 knots. Wind waves 3 feet. North swell 6 feet. Showers likely late in the evening, then scattered showers after midnight.
Sunday..Northwest winds 15 knots. Wind waves 4 feet. North swell 10 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..North winds 15 knots. Wind waves 4 feet. North swell 10 feet. Isolated showers in the evening, then scattered showers after midnight.
Monday..North winds 15 knots. Wind waves 3 feet. North swell 10 feet. Scattered showers.
Monday night..Northeast winds 15 knots. Wind waves 3 feet. North swell 10 feet. Scattered showers.
Tuesday..Northeast winds 10 knots. Wind waves 2 feet or less then 3 feet in the afternoon. North swell 9 feet. Scattered showers.
Tuesday night..Northeast winds 10 knots. Wind waves 3 feet. North swell 7 feet. Scattered showers.
Wednesday..Northeast winds 15 knots. Wind waves 3 to 5 feet. North swell 8 to 10 feet. Isolated showers.
Thursday..Northeast winds to 25 knots. Wind waves 10 feet. North swell 10 to 12 feet. Isolated showers.
PHZ100 934 Pm Hst Sat Nov 18 2017
Synopsis for hawaiian coastal waters.. An area of low pressure located far northeast of the islands waters will remain nearly stationary through early next week before lifting toward the northeast. The low will be replaced by a strong high pressure system, resulting in breezy trade winds during the second half of next week.

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 190630
afdhfo
area forecast discussion
national weather service honolulu hi
830 pm hst Sat nov 18 2017

Synopsis
Cool northerly winds will increase tonight and Sunday as a weak
front moves down the island chain and dissipates. The north winds
will weaken slightly, but continue on Monday and Tuesday as a slow-
moving low sits far northeast of the islands, keeping cool
temperatures in place. Low clouds will drop a few showers, mainly
along north facing slopes and coasts. Trade winds will gradually
return on Wednesday and may become quite gusty by thanksgiving as a
strong high builds north of the state.

Discussion
A deep-layer complex low is centered about 700 miles nne of the
islands, with a strong surface high centered about 1500 miles to the
nnw. The gradient between these two features is producing light to
moderate NW to N winds over the islands this evening, which is
advecting cool and relatively dry air over the area. A diffuse and
poorly-organized frontal band is fragmenting near oahu, while other
low diffuse cloud bands are developing in the cyclonic flow around
the low to the n. A mix of high and low clouds is making for mostly
cloudy skies in many areas, while radar shows widely scattered
showers tracking toward the sse near kauai, oahu and molokai, with
isolated showers near maui and the big island. The gradient
associated with low aloft is generating strong winds over the
summits of the big island, where a high wind warning remains in
place through Sunday.

Latest forecast guidance indicates that the deep-layer low will
linger to the N of the islands through Monday before it gradually
moves away to the NE on Tuesday. This will keep winds elevated over
the big island summits, and may necessitate an extension of the high
wind warning. At the surface, light to moderate NW to N winds will
continue to keep a cool air mass in place, while also sending a
varying amount of low clouds toward the islands. These clouds will
likely produce a few showers along N facing slopes and coasts, but
as the low-level winds continue to advect dry air over the area,
these showers are not expected to amount to very much, especially on
the SE end of the island chain. The caveat is that the island
atmosphere is expected to be quite unstable due to cold mid- and
upper-level temperatures associated with the low, and this
instability is expected to tap some of the limited low-level
moisture, resulting in a few showers.

Winds will gradually shift toward a trade wind direction on
Wednesday then potentially become quite strong on thanksgiving as
the low departs and strong high pressure builds to the N of the
area. This high is expected to support strong trades into the
holiday weekend. A trough aloft may make for a showery trade wind
weather regime with windward showers spreading leeward on the strong
winds.

Aviation
A weak frontal band will continue to move south over the island
chain, low clouds are currently moving into molokai and maui. These
bands of showers will produce temporary periods of MVFR conditions
in moderate showers as the front moves south down the island chain.

Low cloud ceilings along the frontal band will linger over oahu this
evening and airmet sierra for tempo mountain obscuration remains in
effect. The expansion of airmet sierra may be needed over molokai
and maui later tonight as the front moves south.

Cool and drier air will move into the islands from the north on
Sunday with shower activity becoming more isolated for the smaller
islands by late Sunday afternoon. Scattered showers and low cloud
ceilings will continue to linger over the big island through Sunday
evening.

Marine
A slow-moving intense low pressure system located far NE of the
islands will be the primary weather feature impacting the islands
over the next couple of days. Northerly winds blowing across the
islands will remain below small craft advisory (sca) levels through
Tuesday. But as the low drifts off toward the NE thereafter,
moderate to strong NE trades will be filling in across the island
waters. This process is expected to take place between Tuesday night
and Thursday, where an a SCA will likely be posted for many, if not
all, of the marine zones.

This intense low has generated a large open swell a couple of days
ago, targeting the islands. This swell is slated to reach the north
shores later tonight. It is expected to peak Sunday into Monday, and
then begin to fade Tuesday through Wednesday. Advisory level surf is
expected for most areas exposed to the north swell, with warning
level surf on tap for kauai. A high surf warning has been posted for
kauai and niihau, and a high surf advisory for oahu, molokai, maui
and the big island, starting at 6 am hst Sunday morning. This swell
will bring seas in excess of 10 ft to exposed waters, so an SCA has
also been posted for most waters.

But as one swell departs, another one is expected to arrive. Models
are predicting a storm low will form in the gulf of alaska in the
next 24 hours. This low will generate a large ocean swell aimed
toward the islands, slated to impact the north facing shores on
Wednesday. This swell will have about the same magnitude as the
current one, although its period will be slightly longer, at around
15 seconds, as compared to the current 10 to 13 seconds. Never-the-
less, near or at warning level surf is likely for thanksgiving
before subsiding into the weekend.

In response to recent activity in the far south pacific, small surf
is expected to continue along the south facing shores of the islands
through next week.

See the latest collaborative nearshore and swell forecast for oahu
for more details on the surf at:

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51210 3 mi53 min 79°F6 ft
51202 - Mokapu Point, HI (098) 7 mi49 min 79°F6 ft
51211 14 mi53 min 80°F2 ft
51201 - Waimea Bay, HI (106) 22 mi51 min 77°F7 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi1.9 hrsW 410.00 miMostly Cloudy73°F63°F71%1011.4 hPa
Honolulu, Honolulu International Airport, HI10 mi60 minNW 710.00 miA Few Clouds73°F60°F64%1012.5 hPa
Wheeler Air Force Base / Oahu, HI12 mi57 minNW 710.00 miLight Drizzle65°F62°F91%1013.4 hPa
Oahu, Kalaeloa Airport, HI17 mi60 minNE 610.00 miFair70°F61°F73%1013.6 hPa

Wind History from HNG (wind in knots)
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Last 24hrSW5S5CalmS3S4CalmCalmCalmCalmS3CalmNW4N5N7N8N9N8N11N10N12N12NW6W4NW3
1 day agoNE9NE10NE8NE6
G14
NE7NE5NE6E5NE5NE4NE6NE7NE7NE6N7N9NE6NE7NE10NE854S5S5
2 days agoNE17
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G18
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NE9

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Sun -- 04:36 AM HST     2.24 feet High Tide
Sun -- 06:44 AM HST     Sunrise
Sun -- 07:46 AM HST     Moonrise
Sun -- 11:37 AM HST     0.34 feet Low Tide
Sun -- 04:19 PM HST     0.90 feet High Tide
Sun -- 05:48 PM HST     Sunset
Sun -- 07:09 PM HST     Moonset
Sun -- 09:50 PM HST     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.11.622.22.221.71.30.90.50.40.40.50.60.80.90.90.70.50.30.100.1

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Sun -- 03:39 AM HST     2.18 feet High Tide
Sun -- 06:44 AM HST     Sunrise
Sun -- 07:45 AM HST     Moonrise
Sun -- 10:57 AM HST     0.40 feet Low Tide
Sun -- 03:22 PM HST     0.90 feet High Tide
Sun -- 05:48 PM HST     Sunset
Sun -- 07:08 PM HST     Moonset
Sun -- 09:06 PM HST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.92.12.221.71.310.70.50.40.50.60.80.90.90.80.60.40.20.10.20.4

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 (3,6,7,8)
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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.