Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Holualoa, 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 6:22AMSunset 6:32PM Thursday March 21, 2019 12:44 PM HST (22:44 UTC) Moonrise 7:43PMMoonset 7:13AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 904 Am Hst Thu Mar 21 2019
Rest of today..West of the big island, south winds 10 knots veering west in the afternoon. NEar south point, east winds 15 knots. Wind waves 6 feet. Northwest swell 6 feet.
Tonight..West of the big island, north winds 10 knots veering southeast after midnight. NEar south point, east winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Isolated showers.
Friday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 9 feet. Northwest swell 5 feet.
Friday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 9 feet. Northwest swell 5 feet. Isolated showers in the evening.
Saturday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 9 feet. Northwest swell 5 feet. Isolated showers in the morning.
Saturday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 9 feet. Northwest swell 4 feet. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 9 feet. Northwest swell 3 to 4 feet. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 9 feet. North swell 3 feet. Isolated showers.
PHZ100 904 Am Hst Thu Mar 21 2019
Synopsis for hawaiian coastal waters.. Trades will build through tomorrow as high pressure settles far north of state and a front dissipates about 75 nm north of kauai. Trades will strengthen further during the weekend as another high builds north of the islands.


7 Day Forecast for Marine Location Near Holualoa, HI
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location: 19.65, -156     debug


Area Discussion for -
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Fxhw60 phfo 211934
afdhfo
area forecast discussion
national weather service honolulu hi
934 am hst Thu mar 21 2019

Synopsis
Trade winds will continue into next week, even as a cold front
approaches the islands from the northwest. The relatively dry and
stable airmass over the islands today will be replaced with
increasing clouds and showers as a cold front approaches from the
northwest this weekend.

Discussion
Have made some tweaks to the short term pops and associated fields
to align better with the satellite and radar observations this
morning. Have also made some modifications for Monday night into
Tuesday to better reflect the current model depictions for that
time period.

A northeast to southwest cloud band was found over the kauai
channel and oahu during the pre-dawn hours, but the band has been
breaking up since daybreak. The overnight analysis showed the
approaching cold front about 150 miles northwest of kauai. This
has pushed the surface ridge over the islands leading to the
lighter winds persisting. The high is expected to move to the east
later today and tonight, which will allow the pressure gradient
over the islands to strengthen ahead of the front, which is not
expected to reach the islands.

Low level moisture will increase Friday and into the weekend ahead
of the front, and will bring increasing clouds and showers for the
weekend. Will likely nudge the trade winds back up a notch or two
for this weekend, given the latest model trends. There is good
model agreement with a high pressure system currently far
northwest of the islands moving to the east over the next couple
of days, before settling north of the islands and strengthening
Saturday night. By Monday the front starts to fall apart, with the
high continuing to drive trade winds into the region. The moisture
from the front is expected to get caught up in the trade wind
flow, maintaining more clouds and showers for the start of the new
work week.

Aviation
Weak trade wind flow over the islands today will gradually
strengthen over the next twenty-four hours. Scattered to broken
high based stratocumulus is spread out across most of the state
this morning but will become focused along windward slopes and
coasts towards evening. Sea breeze driven cumulus are expected
to develop over island interiors this afternoon then taper off
after sunset. There will be an increased chance of rain over the
smaller islands late tonight as an approaching cold front stalls
to the northwest of kauai.

Isolated moderate turbulence to the lee of mountains is possible
in response to the strengthening trade winds. However, conditions
are not expected to be widespread enough to warrant an airmet.

Isolated MVFR ceilings and visibilities are to be expected in
passing showers, otherwiseVFR conditions will prevail all areas.

Marine
Trades will gradually increase through Friday. Surface high
pressure, currently centered about 950 nm northwest of kauai, will
settle north of the state on Friday as a front dissipates about
75 nm north of kauai. Trades should reach the moderate to fresh
strength later today, then potentially build to fresh to strong
levels tonight and Friday. A further uptick in the trades is
likely late Saturday and Sunday as stronger high pressure passes
to the north. The strongest winds are expected over the typical
windier waters around maui county and the big island, where a
small craft advisory (sca) may be needed later today or tonight.

In addition, seas may reach border line SCA levels of 10 ft for
additional waters on Friday as a new north-northwest swell
builds. Confidence in SCA conditions increases for the weekend
since stronger trades are expected. Trades will ease early next
week.

Surf along north and west facing shores will hold at or above
march normal through the weekend. The current northwest swell
will produce surf just below advisory levels into Friday. A pulse
of north-northwest swell will build late Friday and may push
north shore surf to the advisory level Friday night and Saturday.

North shore surf will drop below march average late Sunday. For
next week, a small north swell expected Monday night will keep the
surf up for locations that favor this direction through the day
Tuesday. A moderate long-period northwest swell due Wednesday
through Thursday may produce near advisory level surf by
Thursday.

As trade winds build, rough surf along east facing shores will
gradually increase, with wind swell reaching around the march
average of 6 to 7 ft at 7 seconds late Saturday through Monday.

Only trace background southerly swell will occur.

Hfo watches warnings advisories
None.

Discussion... M ballard
aviation... Abedal
marine... Wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 28 mi50 min W 6 G 7 77°F 77°F1017.8 hPa
ILOH1 - 1617760 - Hilo, HI 50 mi44 min ENE 7 G 8.9 74°F 76°F1018.9 hPa (-0.6)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi50 min NNE 12 G 15 74°F 1019.9 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi51 minSW 1010.00 miFair80°F62°F54%1017.9 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW9SW9S10SW11SW8SW7SW5NW3E3SE5E5E5E3NE5NE6N6N7N6N8NE18
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1 day agoSW9SW10SW9SW7W7SW5SW6SW5S6SE7E8SE8E7E7E7E3E5E4E5SE6S6W8SW8SW9
2 days agoNW12NW12NW14NW13NW14N11N16N11N9CalmNE6NE5NE3E5CalmN6NE4E4CalmE3W6W7W6SW8

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Thu -- 04:00 AM HST     1.89 feet High Tide
Thu -- 06:27 AM HST     Sunrise
Thu -- 07:12 AM HST     Moonset
Thu -- 10:27 AM HST     -0.17 feet Low Tide
Thu -- 04:34 PM HST     1.63 feet High Tide
Thu -- 06:35 PM HST     Sunset
Thu -- 07:42 PM HST     Moonrise
Thu -- 10:37 PM HST     0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.511.41.81.91.81.410.50.1-0.1-0.10.10.511.41.61.61.41.10.70.30.10

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 04:27 AM HST     2.20 feet High Tide
Thu -- 06:26 AM HST     Sunrise
Thu -- 07:11 AM HST     Moonset
Thu -- 10:48 AM HST     -0.15 feet Low Tide
Thu -- 04:57 PM HST     1.94 feet High Tide
Thu -- 06:34 PM HST     Sunset
Thu -- 07:41 PM HST     Moonrise
Thu -- 10:59 PM HST     0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.41.92.22.21.91.40.80.3-0.1-0.100.511.51.81.91.81.410.50.10

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 (18,4,5,8)
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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.