Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Kalaoa, 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 6:45AMSunset 6:22PM Tuesday February 19, 2019 7:44 PM HST (05:44 UTC) Moonrise 6:57PMMoonset 7:05AM Illumination 99% Phase: Full Moon; Moon at 15 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- 314 Pm Hst Tue Feb 19 2019
Tonight..Northeast winds 20 knots becoming east 10 knots after midnight. Wind waves 3 feet. East swell 6 feet. SWell northwest 3 feet. Periods of rain and chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall.
Wednesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. East swell 6 feet. SWell northwest 3 feet. Scattered showers.
Wednesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 3 feet. East swell 7 feet. Scattered showers.
Thursday..Northeast winds 10 knots. Wind waves 3 feet. East swell 6 feet. Isolated showers.
Thursday night..North winds 10 knots. Wind waves 3 feet. East swell 6 feet. Isolated showers.
Friday..North winds 10 knots. Wind waves 3 feet in the morning then 2 feet or less. East swell 5 feet. Isolated showers.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. East swell 4 feet. Isolated showers.
Saturday..West of the big island, north winds 10 knots becoming variable less than 10 knots. NEar kawaihae, northeast winds 10 knots. Wind waves 3 feet. East swell 3 to 4 feet.
Sunday..West of the big island, north winds 10 knots becoming variable less than 10 knots. NEar kawaihae, northeast winds 10 knots. Wind waves 3 feet. East swell 3 feet.
PHZ100 314 Pm Hst Tue Feb 19 2019
Synopsis for hawaiian coastal waters.. A surface trough will linger near the big island into the weekend. Winds may briefly increase to moderate to fresh levels near the trough tonight, especially in the vicinity of strong Thunderstorms. Elsewhere, generally gentle and variable winds are expected, with northeasterly winds possible by late Wednesday or Thursday.


7 Day Forecast for Marine Location Near Kalaoa, HI
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location: 19.75, -156.05     debug


Area Discussion for -
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Fxhw60 phfo 200335
afdhfo
area forecast discussion
national weather service honolulu hi
535 pm hst Tue feb 19 2019

Update
Radar and satellite trends indicate that the flash flood watch for
maui county is no longer necessary, and it has been cancelled.

Synopsis
Widespread light to moderate rain will affect the big island into
Wednesday, with a chance of thunderstorms and heavy rainfall due to
a nearby surface trough. The trough will linger near the big island
into Friday, acting as a continued focus for cloud and shower
development. A mostly dry and quiet weather pattern now over kauai
and oahu will spread to maui county overnight, with light winds and
limited rainfall expected for the next couple of days. Light to
moderate trade winds will prevail statewide by the weekend, with
brief windward showers favoring nights and mornings.

Discussion
A complex weather pattern remains in place over the islands this
afternoon, with a weakening mid- and upper-level trough over the
islands fueling widespread light to moderate rain over the area from
molokai to the big island. Strong to severe thunderstorms have been
noted over big island SE waters this afternoon, and over offshore
waters to the E and se, but little in the way of thunderstorms have
been noted elsewhere.

A weak 1012 mb surface low is centered about 450 miles NW of kauai,
a very strong 1043 mb high is centered far nne of the islands, while
a developing surface trough is analyzed near and NE of the big
island. The swath of mid- and high-level clouds moving over the area
from the S is reducing confidence as to the location and strength of
the surface trough.

The forecast calls for the mid- and upper-level trough to move E and
ne across the islands as the parent low lifts N over the next 12-24
hours. Rain chances over the area from kauai to oahu have decreased
dramatically as the trough axis has moved e, and a similar
drying clearing trend is expected over maui county this evening. The
ongoing flash flood watch (ffa) for maui county will expire this
evening, but has been extended overnight for the big island as the
trough aloft will combine with a nearby surface trough to bring the
threat of heavy rainfall on already wet grounds. Additionally,
temperatures on the summits of mauna kea and mauna loa are hovering
near the freezing mark, with a mix of snow and rain (and potentially
ice) prompting a winter storm warning through tonight. The potential
for winter weather diminishes significantly tomorrow as temperatures
at summit levels warm. The upper trough is also bringing strong
winds to the summits that should also diminish Wednesday, and the
current wind advisory should be allowed to expire.

After light to moderate rain diminishes over maui county this
evening, light winds and isolated showers are expected to prevail
from kauai to maui into Thursday. Meanwhile locally heavy showers
will continue near and E of the big island as the surface trough
lingers. Late in the week, a weak high pressure cell passing N of
the islands will bring light NE trade winds to most of the island
chain, with these trade winds expected to deliver brief windward
showers that will likely favor nights and mornings. The surface
trough is expected to linger near the big island, continuing to act
as a focus for cloud and shower development until it finally moves e
over the weekend.

Long range outlook features NE trade winds that will bring windward
showers, but high-impact weather is not expected at this time.

Aviation
An upper level trough axis just north of kauai will move away from
the area tonight. Meanwhile, a north to south surface trough axis is
stretched over the big island. These features will bring widespread
layered clouds and showers, mainly over maui and the big island
tonight. Isolated thunderstorms will also be possible over the big
island tonight.

Airmet sierra is in effect for tempo ifr conditions in the showers
across maui and eastern sections of the big island. Airmet sierra
for tempo ifr conditions or mountain obscurations will likely
continue into tonight for maui and the big island.

Airmet tango is in effect for moderate turbulence between fl250 and
fl350 across the entire state. Turbulence will likely decrease as
the trough lifts away later tonight.

Light icing is also expected across the eastern half of the state
due to the layered clouds and showers associated with the upper
trough.

Marine
A surface trough will continue to develop near the big island
tonight. Strong thunderstorms with gusty and erratic winds can be
expected near the trough across big island waters tonight. Outside
of thunderstorms, fresh southeasterly winds may briefly develop to
the east of the big island, while gentle and variable winds are
expected over the rest of the island chain.

The surface trough will meander around the big island from Wednesday
into the weekend. Variable winds will prevail to the west of the
trough, with gentle to locally moderate northeasterly winds
potentially developing late Wednesday or Thursday. To the east of
the trough, moderate southeasterly winds are expected, with gale
force winds over the offshore waters to the north of the big island
into Wednesday.

During the next 24 hours, small moderate northwest and north swells
will fade as a short-period east swell builds. A high surf advisory
remains in effect for east facing shores of the big island and maui,
and was just expanded westward for molokai, oahu, and kauai. This
east swell is being generated by a fetch of east to southeast winds
produced by a strong 1043 mb high sitting 1500 miles north-northeast
of the state. These winds have also been enhanced just east of the
state by the surface trough developing near the big island. Winds in
the fetch aimed at hawaii should slowly ease beginning tonight,
leading to a peak in the swell locally on Wednesday or early
Thursday. East shore surf will decline late Thursday and Friday. No
significant northwest swells are due through the weekend, though an
increase in northwest swell is likely heading into next week.

A small craft advisory (sca) is in effect for waters around the big
island and maui exposed to the building, short-period east swell,
which should cause combined seas to reach 10 ft. The SCA may nee to
be expanded westward to windward oahu and kauai waters as the east
swell peaks on Wednesday.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Thursday for east facing shores
of kauai oahu molokai maui and the big island.

Flash flood watch through late tonight for big island.

Wind advisory until 6 am hst Wednesday for big island summits.

Winter storm warning until 6 am hst Wednesday for big island summits.

Small craft advisory until 6 am hst Thursday for maui county
windward waters-alenuihaha channel-big island windward waters-
big island southeast waters.

Discussion... Birchard
aviation... Foster
marine... Wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 23 mi51 min SE 2.9 G 5.1 71°F 76°F1013.5 hPa
ILOH1 - 1617760 - Hilo, HI 53 mi45 min N 23 G 29 71°F 75°F1012.3 hPa (+1.3)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 82 mi51 min W 8 G 8 69°F 1011.7 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI7 mi52 minNE 19 G 348.00 miLight Rain and Breezy71°F64°F81%1011.1 hPa

Wind History from HKO (wind in knots)
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Last 24hrNE6NE3NE5NE4S6NW4E6SW3N8NE3S16S14SE10CalmSE9SE9S8S7W12N9NW11NW10NW15N10
1 day agoN5NE3E3E5E4E5E4E4E5E5NE5NE5NE8N13N13NW12NW6S6S6N5N6S8CalmN14
2 days agoNW6NW7NW5NE5NE4E3E5E6E7E7E7E8E5S6S7S8W9SW10SW9SW10SW8SW8W6N4

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
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Wed -- 04:24 AM HST     2.33 feet High Tide
Wed -- 06:49 AM HST     Sunrise
Wed -- 07:53 AM HST     Moonset
Wed -- 11:14 AM HST     -0.12 feet Low Tide
Wed -- 04:49 PM HST     1.30 feet High Tide
Wed -- 06:25 PM HST     Sunset
Wed -- 08:00 PM HST     Moonrise
Wed -- 10:31 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.511.62.12.32.321.510.40.1-0.1-00.20.611.21.31.20.90.50.2-0-0

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 04:28 AM HST     2.29 feet High Tide
Wed -- 06:49 AM HST     Sunrise
Wed -- 07:53 AM HST     Moonset
Wed -- 11:15 AM HST     -0.12 feet Low Tide
Wed -- 04:51 PM HST     1.24 feet High Tide
Wed -- 06:25 PM HST     Sunset
Wed -- 08:00 PM HST     Moonrise
Wed -- 10:32 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.411.522.32.321.510.50.1-0.1-0.10.20.60.91.21.21.10.80.50.2-0-0

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 (0,6,7,8)
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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.