Monday, May22, 2017 L-36.com


Marine Weather and Tides
Koloa, 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 5:49AMSunset 7:08PM Monday May 22, 2017 7:32 AM HST (17:32 UTC) Moonrise 3:38AMMoonset 4:16PM Illumination 9% Phase: Waning Crescent; Moon at 27 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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PHZ113 Kauai Channel- 330 Am Hst Mon May 22 2017
Today..Northeast winds 20 knots. Wind waves 6 feet. Northwest swell 5 feet. Scattered showers in the morning...then isolated showers in the afternoon.
Tonight..Northeast winds to 25 knots. Wind waves 7 feet. Northwest swell 5 feet. Isolated showers in the evening...then scattered showers after midnight.
Tuesday..East winds 20 knots. Wind waves 7 feet. North swell 5 feet. Scattered showers in the morning...then isolated showers in the afternoon.
Tuesday night..Northeast winds to 25 knots. Wind waves 7 feet. North swell 4 feet. Isolated showers in the evening...then scattered showers after midnight.
Wednesday..East winds 20 knots. Wind waves 6 feet. North swell 3 feet. Scattered showers.
Wednesday night..Northeast winds 15 knots. Wind waves 5 feet. North swell 3 feet. Scattered showers.
Thursday..Northeast winds 15 knots. Wind waves 3 to 4 feet. North swell 3 feet. Scattered showers.
Friday..Northeast winds 10 knots. Wind waves 2 feet or less. North swell 3 feet. Scattered showers.
PHZ100 330 Am Hst Mon May 22 2017
Synopsis for hawaiian coastal waters.. A front will stall and dissipate just northwest of kauai. At the same time...a new surface high far northwest of the islands will build eastward...resulting in strengthening trade winds through midweek.

7 Day Forecast for Marine Location Near Koloa, HI
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location: 21.9, -159.48     debug


Area Discussion for -
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Fxhw60 phfo 221406
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Mon may 22 2017

Synopsis
Trades will continue to increase and become quite brisk through
Tuesday, as a strengthening high pressure passes far north of the
islands. Showers embedded in the winds may be enhanced as a weak
upper level trough is expected to move across the state later today
through Tuesday. Trades will gradually weaken during the latter
half of the week, becoming light and variable by the start of the
holiday weekend as a surface trough is expected to develop near the
islands.

Discussion
Moderate trade winds prevail across the islands early this morning
as a high pressure far northwest of the area moves east-northeast.

There is a weakening frontal cloud band just northwest of the
islands, and it will stay northwest of the area through Tuesday.

Latest satellite imagery revealed not much low clouds in the island
vicinity early this morning, except for the big island where an area
of low clouds has reached that island earlier, bringing a little
more showers. There are also some thin high clouds passing over the
southern islands, keeping the skies a little cloudier at times.

Early morning lihue sounding revealed a stable airmass, though the
usual trade wind inversion is rather weak, while hilo sounding has a
much well-defined trade wind inversion. Surprisingly, hilo sounding
is rather dry considering the present of clouds and showers in its
vicinity.

As the aforementioned high passes far north of the islands through
Tuesday and strengthens, trades will firm up quite a bit across the
area, becoming locally windy later today through Tuesday. The rather
breezy trade wind weather is expected for the next couple of days,
with passing low clouds and showers affecting mainly windward areas.

Winds will be strong enough to carry low clouds and showers to the
lee areas of the smaller islands. In the meantime, a weak upper
level trough is expected to pass over the state later today through
Tuesday. The cooler temperatures aloft associated with this feature
will allow the airmass in the island vicinity to become a little
more unstable, with passing showers becoming more enhanced. On the
other hand, forecast models do not indicate much increase in the low
level moisture. Coupled with the rather robust trade winds, these
enhanced showers are not expected to pose any hydrological problem
for the islands.

The trades will very gradually decrease toward the later part of the
week as the latest models still indicated a sharp upper level trough
will move in from the northwest, leading to the possible development
of a weak surface trough near the islands by the start of the
holiday weekend. Moreover, pressure gradient across the area is
expected to ease enough for the synoptic winds to become quite
light, allowing more widespread daytime sea breezes to develop.

Moisture from the old frontal cloud band to our north may also
finally to spread to the islands, especially the northern ones,
while the airmass in the island vicinity may become unstable.

Therefore, weather may become more active for the state toward the
next weekend, with more enhanced showers and less winds. The
unsettled weather may linger in the area through the memorial day
weekend.

Aviation
Trade winds will continue to strengthen today and remain breezy
through mid week, as an area of high pressure well northwest of the
state strengthens and shifts eastward. Clouds and showers will favor
windward and mauka areas, but may occasionally spread leeward due to
the strength of the trades. PredominantlyVFR conditions are
expected in most areas through early this evening. The exceptions
are windward big island and possibly windward maui, where an area of
enhanced clouds and showers will bring several hours of MVFR
cigs/vsbys later this morning.

Airmet sierra may be needed for windward big island and possibly
windward maui later this morning as the area of enhanced clouds and
showers moves in with the trades.

Airmet tango will likely be needed for low level turbulence over and
downwind of the terrain with the 22/16z airmet issuance due to the
strengthening trade winds.

Marine
With trade winds on the increase, a small craft advisory (sca) is
now in effect for the typically windier zones around maui and the
big island. More zones are likely to be added, possibly later today
or tonight, as high pressure strengthens across the area. Winds will
begin to weaken by midweek.

The current south swell will gradually lower through Wednesday. Wave
model guidance continues to show a larger south-southwest swell
arriving later in the week, persisting through most of the memorial
day weekend. This swell has the potential of boosting surf along
south-facing shores to near 8 feet, which is at the threshold for a
high surf advisory. In addition, the combination of swell energy and
greater than normal astronomical tides may result in minor coastal
flooding due to wave run-up along south-facing shores this coming
weekend, especially during each high tide.

The next moderate northwest swell has been arriving this morning. It
is forecast to peak today before slowly subsiding and swinging
around to a north-northwest direction through midweek. This swell is
expected to increase surf along north- and west-facing shores, but
remaining below advisory level. A small, short-period north swell is
expected to follow Thursday and Friday, before shifting around to a
north-northeast swell early this coming weekend. Also, short-period
choppy wind waves will return along east-facing shores as the trade
winds gradually strengthen.

For more detailed information on surf for oahu, see the latest
collaborative nearshore swell and wind forecast
(

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi51 min ENE 11 G 15 76°F 82°F1017.7 hPa
51208 27 mi41 min 79°F5 ft
51201 - Waimea Bay, HI (106) 74 mi61 min 78°F5 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi40 minNE 1410.00 miPartly Cloudy77°F64°F66%1018.2 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI20 mi37 minENE 310.00 miFair0°F0°F%1017.9 hPa

Wind History from HLI (wind in knots)
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Last 24hrNW4NE9NE9NE12NE11NE10NE11NE11NE12NE12NE13NE10NE14NE13NE12NE11NE14NE12NE12NE14NE14NE15NE12NE14
1 day agoW5E5NE5E6E9E10E9E7E5E7E6E6E9E7NE7E7E7NE6W4W5W4W6NW5W5
2 days agoW64E5E6E8E75E4E4E5E5E5E5N11N8W4W6W7W3NE6W9W8W8SW6

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
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Mon -- 12:38 AM HST     1.12 feet High Tide
Mon -- 03:36 AM HST     Moonrise
Mon -- 05:55 AM HST     Sunrise
Mon -- 06:58 AM HST     -0.32 feet Low Tide
Mon -- 01:54 PM HST     1.60 feet High Tide
Mon -- 04:15 PM HST     Moonset
Mon -- 07:12 PM HST     Sunset
Mon -- 08:07 PM HST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.110.70.40-0.2-0.3-0.20.10.40.91.31.51.61.51.20.90.50.30.20.30.40.6

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Mon -- 03:37 AM HST     Moonrise
Mon -- 05:32 AM HST     -0.32 feet Low Tide
Mon -- 05:55 AM HST     Sunrise
Mon -- 12:43 PM HST     1.70 feet High Tide
Mon -- 04:16 PM HST     Moonset
Mon -- 06:41 PM HST     0.20 feet Low Tide
Mon -- 07:13 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.210.70.3-0.1-0.3-0.3-0.10.20.61.11.41.71.71.51.20.80.50.20.20.30.50.81

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 (13,3,4,5)
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Ground Weather Radar Station Kauai, 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.