Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Holualoa, 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 6:01AMSunset 6:45PM Sunday August 20, 2017 5:19 AM HST (15:19 UTC) Moonrise 5:04AMMoonset 6:17PM 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- 332 Am Hst Sun Aug 20 2017
Today..West of the big island, winds variable less than 10 knots becoming southwest 10 knots in the afternoon. NEar south point, north winds 10 knots becoming east 20 knots in the afternoon. Wind waves 4 feet. Haze through the day. Isolated showers through the day.
Tonight..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Haze. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. Haze. Isolated showers.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Haze. Isolated showers.
Tuesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Haze. Isolated showers.
Tuesday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Haze. Scattered showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. South swell 3 feet. Haze. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Southeast swell 3 feet and east 3 feet. Haze. Isolated showers.
PHZ100 332 Am Hst Sun Aug 20 2017
Synopsis for hawaiian coastal waters.. A surface high will remain far northeast of the area and weaken through Tuesday. A new surface high will build far north of the area on Monday. A low aloft will track southwest across the region today through Tuesday.

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 201331
afdhfo
area forecast discussion
national weather service honolulu hi
331 am hst Sun aug 20 2017

Synopsis
Light to moderate trade winds will prevail through early next
week as a weakened ridge remains to our north. Expect local sea
breezes along with increased afternoon clouds and showers across
leeward areas. Low clouds carried by the trades will continue to
affect windward and mauka areas. Tropical moisture from the east
will increase shower coverage and keep muggy conditions around
through Tuesday. Instability will introduce a slight chance of
thunderstorms today through Tuesday. Drier and windier conditions
will return Wednesday as the ridge strengthens to our north.

Discussion
The subtropical ridge far north of the main hawaiian islands
continues to weaken as upper troughing between 145w and 165w
takes its toll. The ridge is strong enough to drive light to
moderate trade winds across local waters, but we expect trade flow
will be too weak to defeat development of local leeward sea
breezes each afternoon today through Tuesday. Satellite loop shows
patchy broken low clouds embedded within trade flow moving across
windward and mauka areas of the islands, while radar shows
isolated to scattered showers across these same areas. Increased
low cloud cover is noted east of about 154w, along the leading
edge of an expected increase in tropical moisture. Overnight
soundings show increasing moisture, with about 1.5 inches of pw at
both stations, along with increasing instability. Weak inversions
are noted between 8000 and 10000 feet.

Models show the upper trough over and north of the islands will
dig to the southwest through early next week, keeping the ridge
weak and dragging a pool of cold air over the western half of the
chain. Combined with an expected increase in tropical moisture
from the east, this colder air aloft will introduce a slight
chance of thunderstorms to our forecast from this afternoon
through the day Tuesday. This threat will start with the potential
for thunderstorms across leeward portions of the big island
this afternoon, then morph into a broader threat including kauai
and or oahu Sunday night through Monday night. As the pool of cold
air begins to pass west of the islands, the thunderstorm threat
will shrink once again to only leeward portions of the big island
Tuesday afternoon before vanishing altogether.

Outside of the thunderstorm threat, the general weather pattern
today through Tuesday will consist of windward clouds and showers
merging with afternoon and evening leeward clouds and showers,
thanks to the hybrid light trade sea breeze setup. By Wednesday,
the upper trough, with its associated cold air pool, will be far
west of the main islands. This will allow the ridge to our north
to rebound and drive stronger trade winds across local waters. In
short, drier and windier conditions are expected Wednesday through
the rest of the forecast period.

Aviation
Airmass in the island vicinity has become unstable as an upper
level trough deepens in the area. Moisture from the east spreading
over the state will be enhanced under the unstable atmospheric
conditions, with more clouds and possible heavier showers developing,
affecting mainly windward and mountain areas. Conditions will also
be favorable for a slight chance of thunderstorms over the lee and
southeast areas of the big island this afternoon and evening.

Vfr conditions continue at all TAF sites with brief MVFR conditions
for the windward sites early this morning. Expect MVFR conditions
to become more widespread over the windward areas as the moisture
spread east, leading to possible airmet mountain obscuration later
today.

Marine
Winds and seas are expected to remain in the moderate to fresh
range through Tuesday, then strengthen into the fresh to strong
category Wednesday through the remainder of the week. Increasing
shower coverage will become a possibility tonight into the first
half of the week as an upper trough drifts southwestward over the
region. This upper trough will also support a slight chance of
thunderstorms from this afternoon through the day Tuesday.

Surf along south facing shores will continue to lower today as a
south-southeast swell that filled in and peaked late Friday eases.

Looking ahead, mainly small background long-period reinforcing
pulses out of the south-southwest (210-220 deg) and south-
southeast (130-160 deg) will keep the surf from going flat each
day along south facing shores this week. A slightly larger south-
southwest (220 deg) swell will be possible next weekend due to a
gale over the tasman sea. For more detailed surf information, see
the latest collaborative nearshore swell and wind forecast at


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 28 mi49 min NNE 1.9 G 4.1 78°F 82°F1013.1 hPa
ILOH1 - 1617760 - Hilo, HI 50 mi49 min SSE 2.9 G 4.1 74°F 82°F1013.8 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi49 min E 1 G 5.1 74°F 81°F1013.6 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi26 minN 010.00 miFair78°F71°F79%1012.7 hPa

Wind History from HKO (wind in knots)
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Last 24hrCalmNE3SE6S9S8SW10SW8SW9W10W10SW10SW10SW11W9W8SW8W5SW6SW5SE5S5----Calm
1 day agoSE3E4SE6S10S9S10S11S11S11S12S10SW7SW5W5W8NW11NW10N6SE10SE5CalmNE5CalmE4
2 days agoSE5NE5CalmS7S8S11SW10SW11SW10S9SW10SW11SW10S7S5SW4N7E7N3--CalmN3NE4NE6

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sun -- 02:34 AM HST     1.17 feet High Tide
Sun -- 05:03 AM HST     Moonrise
Sun -- 06:05 AM HST     Sunrise
Sun -- 08:11 AM HST     0.00 feet Low Tide
Sun -- 03:09 PM HST     2.50 feet High Tide
Sun -- 06:16 PM HST     Moonset
Sun -- 06:48 PM HST     Sunset
Sun -- 10:02 PM HST     0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.711.11.210.70.40.100.10.40.81.41.92.32.52.42.11.61.10.60.30.20.3

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sun -- 02:58 AM HST     1.16 feet High Tide
Sun -- 05:02 AM HST     Moonrise
Sun -- 06:04 AM HST     Sunrise
Sun -- 08:35 AM HST     -0.19 feet Low Tide
Sun -- 03:33 PM HST     2.57 feet High Tide
Sun -- 06:16 PM HST     Moonset
Sun -- 06:48 PM HST     Sunset
Sun -- 10:20 PM HST     0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.81.11.21.10.80.40.1-0.1-0.20.10.51.11.72.22.52.52.31.81.20.60.200.1

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 (11,2,3,4)
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Ground Weather Radar Station Kohala, 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.