Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Honaunau-Napoopoo, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:17AMSunset 6:34PM Saturday March 25, 2017 1:28 PM HST (23:28 UTC) Moonrise 4:43AMMoonset 4:39PM Illumination 3% 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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PHZ123 Big Island Leeward Waters- 928 Am Hst Sat Mar 25 2017
.small craft advisory in effect through early Monday morning...
Rest of today..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 4 ft. Haze.
Tonight..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 9 ft. Northwest swell 6 ft. Haze. Isolated showers.
Sunday..West winds 10 kt west of the big island...east to 25 kt near south point. Wind waves 10 ft. Northwest swell 8 ft. Haze. Isolated showers.
Sunday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 9 ft. Northwest swell 8 ft. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Monday..Winds variable less than 10 kt west of the big island... East to 25 kt near south point. Wind waves 9 ft. Northwest swell 7 ft. Haze. Isolated showers.
Monday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 6 ft. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Tuesday..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 5 to 6 ft. Haze. Isolated showers.
Wednesday..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 5 ft. Haze. Isolated showers.
PHZ100 928 Am Hst Sat Mar 25 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the state will strengthen over the next few days...providing locally breezy trade winds through the weekend. Winds will ease slightly early next week as the high moves further from the state. A large west-northwest swell is expected to spread across the waters today...then peak tonight into Sunday.

7 Day Forecast for Marine Location Near Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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Fxhw60 phfo 251925
afdhfo
area forecast discussion
national weather service honolulu hi
925 am hst Sat mar 25 2017

Synopsis
A persistent ridge of high pressure north of the islands will keep
trade winds blowing through the next week, with locally breezy
levels expected this weekend. A dry and stable airmass will keep
showers limited and confined to windward slopes through early next
week. An increase in trade wind showers is then expected Tuesday
through late next week as upper level troughing sets up over the
island chain.

Discussion
Currently at the surface, a 1027 mb high is centered around 700
miles to the northeast of honolulu, and this is resulting in
moderate trade winds across the state this morning. Mimic total
precipitable water (pw) imagery shows a dry airmass overspreading
the island chain with pw values at or below 1 inch. This
correlates well with the 12z sounding from phto indicating a pw
value of 0.77 inches, while the phli sounding observed a pw value
of 1.23 inches in a slightly more moist airmass which has now
shifted west of the kauai. Additionally the 12z soundings showed a
stable airmass working in from the east, with a sharp low level
inversion around 3kft at phto and a weaker inversion around 3 kft
at phli. Satellite and radar imagery also reflect the dry airmass
over the islands, with clear to partly cloudy skies in most areas
and little if any shower activity. Main short term concern
revolves around the building large northwest swell moving into the
islands.

Today through Tuesday,
a pair of high pressure areas will consolidate northeast of the
state through the weekend, leading to an increase in the local
pressure gradient across the islands. As a result, moderate to
locally breezy trade winds are expected to prevail through Sunday
night, with the trade wind speeds then dropping off a notch on
early next week as high pressure lifts further northeast and away
from island chain. A dry and stable airmass is expected to limit
shower activity across the island chain through the period, with
pw values remaining around or slightly below 1 inch. Showers will
favor windward and mauka areas, primarily during the overnight and
early morning hours.

Tuesday night through Friday,
model solutions are in good agreement showing high pressure
remaining anchored well to the northeast of the state through the
period, with a weakening front approaching from the northwest late
in the week. Light to moderate trades are expected to prevail
through the period, with some decrease in trade wind speeds
possible by the end of the week depending on the proximity of the
approaching front to the island chain. Aloft, a weakness in the
upper level ridge is expected to move overhead during the middle
and latter part of next week, and this should de-stabilize the
airmass a bit. This in combination with increasing boundary layer
moisture resulting from the persistent easterly trades, should
lead to an increase in trade wind showers across the islands.

Showers will continue to favor windward and mauka areas, with
activity most prevalent during the overnight and early morning
hours.

Aviation
Locally breezy trade winds will continue. The morning sounding
from phto shows a strong low level inversion near 3 kft, and the
phli sounding shows a weaker inversion near 3 kft as well. Airmet
tango for low level turb has been issued this morning for areas
over and south through west of the mountains. The first few
visible satellite images show wave clouds starting to set up
along the koolau mountains. Expect prevailingVFR conditions at
most terminals today.

Marine
The large west-northwest (wnw) swell approaching the area
continues to rise at NOAA buoys 51101 and 51001. Both buoys
reported the swell height at 7.5 feet every 19 seconds from the
wnw. Forerunners of this swell have reached the hanalei, kauai and
waimea bay cdip buoys with reports of 20 and 22 second periods
respectfully. These observations are in excellent agreement with
the forecast models, and therefore no adjustments are needed to
the forecast.

Surf on kauai is expected to build to warning levels (25 ft
north/20 ft west) during the day, then peak tonight into Sunday
morning. Warning level surf should continue through the day
Sunday, before gradually subsiding early next week. The more
westerly direction of the swell will likely cause kauai to shadow
the other smaller islands. The current forecast continues to hold
surf for exposed north and west facing shores of oahu and maui
county just under warning levels. This will be monitored as more
observations come in from the northwest buoys, and a slightly
larger or more northwest swell could bring warning level surf to
oahu/maui county as well. Surf along west facing shores of the big
island is also forecast to reach low-end warning level (12 ft)
tonight through Sunday night. A high surf warning has been posted
for north/west facing shores of niihau and kauai, and for the west
facing shores of the big island. A high surf advisory has been
posted for north/west facing shores of oahu and molokai, and for
north facing shores of maui.

Otherwise, small long period south swells will continue through
this weekend and into next week, with a slightly larger long
period south swell forecast for Wednesday night through Friday.

Another large west-northwest swell will be possible from next
Friday into the following weekend.

The small craft advisory (sca) remains posted for the typically
windier waters around the big island and maui county through
Sunday night. High pressure strengthening northeast of the state
will provide locally breezy conditions through the weekend. The
expansion of the SCA to cover most of the other coastal waters
late this morning, and the remaining waters early this evening,
due to building seas of the large incoming west-northwest swell is
on track.

Hfo watches/warnings/advisories
High surf advisory from noon today to 6 am hst Monday for
waianae coast-oahu north shore-oahu koolau-molokai-maui windward
west-maui central valley-windward haleakala.

High surf warning until 6 am hst Monday for niihau-kauai
windward-kauai leeward.

High surf warning from 6 pm this evening to 6 am hst Monday for
kona-south big island-kohala.

Small craft advisory until 6 am hst Monday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Small craft advisory from 6 pm this evening to 6 am hst Monday
for oahu leeward waters-maui county leeward waters-big island
windward waters.

Small craft advisory until 6 am hst Monday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters.

Discussion... Jelsema
aviation... Eaton
marine... Evans


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 37 mi41 min W 9.9 G 13 79°F 81°F1019.5 hPa
ILOH1 - 1617760 - Hilo, HI 40 mi41 min ESE 8.9 G 13 1022.1 hPa
51206 45 mi47 min 78°F6 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi36 minWSW 910.00 miMostly Cloudy83°F64°F55%1019.7 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi33 minSE 20 G 2810.00 miFair and Breezy75°F20°F13%1018 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW10S10S14S14S12SE10S10SE11SE7E4S8S9S5SW8N6N5N3CalmCalmSW7SW9SW8SW10SW9
1 day agoSW9SW10SW8W8W7W6W5CalmS4S5SE6SE7SE6E5E4NE3NE6NE12N10N11NW11NW11NW9W7
2 days agoW9W8SW9SW8S7S8S8SE7SE8E6E6E6E3E5E6E6E7E6CalmSW5W8NW11NW10W6

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
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Sat -- 02:04 AM HST     1.92 feet High Tide
Sat -- 04:44 AM HST     Moonrise
Sat -- 06:23 AM HST     Sunrise
Sat -- 08:42 AM HST     -0.00 feet Low Tide
Sat -- 02:27 PM HST     1.30 feet High Tide
Sat -- 04:40 PM HST     Moonset
Sat -- 06:36 PM HST     Sunset
Sat -- 08:17 PM HST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.81.91.81.51.10.70.30.100.20.50.81.11.31.31.10.80.50.200.10.30.7

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 02:19 AM HST     1.89 feet High Tide
Sat -- 04:44 AM HST     Moonrise
Sat -- 06:23 AM HST     Sunrise
Sat -- 08:42 AM HST     0.05 feet Low Tide
Sat -- 02:26 PM HST     1.40 feet High Tide
Sat -- 04:40 PM HST     Moonset
Sat -- 06:36 PM HST     Sunset
Sat -- 08:23 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
1.41.71.91.81.61.20.70.40.10.10.20.50.91.21.41.41.20.80.40.1-0.1-0.10.20.6

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 (19,4,5,8)
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Ground Weather Radar Station South Shore, 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.