Sunday, November19, 2017

Marine Weather and Tides
Kahaluu-Keauhou, 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 6:30AMSunset 5:41PM Sunday November 19, 2017 2:08 AM HST (12:08 UTC) Moonrise 7:37AMMoonset 7:04PM Illumination 1% 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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PHZ123 Big Island Leeward Waters- 934 Pm Hst Sat Nov 18 2017
Rest of tonight..North winds 10 knots. Wind waves 3 feet. North swell 3 feet. Haze.
Sunday..West of the big island, north winds 15 knots. NEar kawaihae, winds variable less than 10 knots becoming west 10 knots in the afternoon. Wind waves 5 feet. North swell 4 feet. Isolated showers.
Sunday night..North winds 15 knots west of the big island... Variable less than 10 knots near kawaihae. Wind waves 4 feet. North swell 4 feet.
Monday..West of the big island, northwest winds 15 knots. NEar kawaihae, winds variable less than 10 knots becoming north 10 knots in the afternoon. Wind waves 3 feet. North swell 5 feet.
Monday night..West of the big island, north winds 15 knots veering east after midnight. NEar south point, winds variable less than 10 knots becoming east 10 knots after midnight. Wind waves 3 feet. North swell 6 feet. Isolated showers in the evening. Haze through the night.
Tuesday..Northeast winds 10 knots. Wind waves 2 feet or less then 3 feet in the afternoon. North swell 7 feet. Haze.
Tuesday night..Northeast winds 15 knots. Wind waves 3 feet. North swell 6 feet. Isolated showers in the evening. Haze through the night.
Wednesday..West of the big island, northeast winds 10 knots in the morning backing northwest, then veering east in the evening becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 4 to 5 feet. North swell 5 to 7 feet. Haze. Isolated showers.
Thursday..West of the big island, northeast winds 15 knots backing north in the afternoon, then veering northeast. NEar kawaihae, northeast winds 20 knots. Wind waves 11 to 12 feet. North swell 7 to 8 feet. Haze. 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-Keauhou, HI
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location: 19.61, -155.97     debug

Area Discussion for -
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Fxhw60 phfo 190630
area forecast discussion
national weather service honolulu hi
830 pm hst Sat nov 18 2017

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.

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

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

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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Wind History for Kawaihae, HI
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi76 minNE 410.00 miA Few Clouds72°F61°F68%1011.1 hPa

Wind History from HKO (wind in knots)
Last 24hrE6E6E5CalmE4E3NE3--NW9NW7W10W9NW6NW8N8N9N8N8NE6NE6NE5NE6NE4E5
1 day agoS3SE11E8E6E6E4S3S9S10S12S13S11SW11SW11SW10SW8SW5S4S6SE5SE6E6E6E4
2 days agoE4NE4NE5NE7NE3NE3E4N7W6SW9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
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Sun -- 04:18 AM HST     2.25 feet High Tide
Sun -- 06:34 AM HST     Sunrise
Sun -- 07:36 AM HST     Moonrise
Sun -- 11:19 AM HST     0.38 feet Low Tide
Sun -- 04:03 PM HST     0.98 feet High Tide
Sun -- 05:43 PM HST     Sunset
Sun -- 07:04 PM HST     Moonset
Sun -- 09:37 PM HST     0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Sun -- 04:35 AM HST     2.40 feet High Tide
Sun -- 06:34 AM HST     Sunrise
Sun -- 07:36 AM HST     Moonrise
Sun -- 11:28 AM HST     0.24 feet Low Tide
Sun -- 04:28 PM HST     1.04 feet High Tide
Sun -- 05:42 PM HST     Sunset
Sun -- 07:02 PM HST     Moonset
Sun -- 10:00 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Hawaii    EDIT

Wind Forecast for (7,2,3,4)
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Ground Weather Radar Station Kohala, HI
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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 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 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.