Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Laupahoehoe, HI

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:00AMSunset 6:46PM Tuesday August 20, 2019 10:18 PM HST (08:18 UTC) Moonrise 10:15PMMoonset 10:12AM Illumination 68% Phase: Waning Gibbous; Moon at 20 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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PHZ122 Big Island Windward Waters- 925 Pm Hst Tue Aug 20 2019
Rest of tonight..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers.
Wednesday night..Northeast winds 20 knots. Wind waves 5 feet. South swell 4 feet. Scattered showers in the evening, then isolated showers after midnight.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 4 feet and northwest 3 feet. Isolated showers through the day.
Thursday night..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 3 feet and northwest 3 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 feet. SWell northwest 3 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 6 feet. SWell northwest 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 to 7 feet. SWell northwest 3 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 7 feet. Scattered showers.
PHZ100 925 Pm Hst Tue Aug 20 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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Fxhw60 phfo 210628
afdhfo
area forecast discussion
national weather service honolulu hi
828 pm hst Tue aug 20 2019

Synopsis
A surface ridge north of the area will maintain locally breezy
trade winds over the islands. Expect showers to remain focused
over windward and mountain areas.

Discussion
No changes to the forecast expected this evening.

A surface ridge north of the islands will maintain a moderate to
locally breezy trade wind pattern over the islands. A weakening
trough south of the big island continues on its westward trek.

This trough is partly responsible for the increase in moisture,
particularly over the southern end of the state. Satellite derived
precipitable water (pw) shows lower values should start filtering
into the islands later tonight. As a result, shower activity over
windward maui and the big island should be on the decrease
overnight.

The trade winds are expected to increase a bit more tomorrow
(Wednesday) as the high associated with the ridge continues to
build. The models remain in good agreement with a front far north
of the islands moving southward through Thursday. This will help
to disrupt the trade wind flow a bit during the second half of the
week. The front will move to the west at the end of the week, and
trade winds will rebound for the weekend. The bulk of the
moisture associated with this front is expected to remain to the
north of the islands, however some increase in shower activity is
possible over kauai Friday.

Aviation
A moderate to locally strong trade wind regime will continue into
Wednesday. Most of the cloudiness lies over the alenuihaha channel,
the waters off the NE facing big island coast, and over the lee
areas of the big island. Otherwise, skies are fair with minimal
shower activity. Cloud bases are estimated above 3k feet with
tops at 6k feet but as high as 9k feet with the showers.

Although there are minimal showers now, we anticipate an increase
overnight, not enough to warrant an airmet sierra, though. But
will bring some brief periods of MVFR ceilings and vis to
especially the windward and mountain areas. A few late night
showers may also develop along the kona coast as well. Otherwise,
vfr conditions will prevail overnight and into Wednesday morning.

Airmet tango is not in effect as conditions are marginal at best
for low level turb, which should hold through Wednesday. But we
will monitor the situation closely and issue it if needed.

Marine
High pressure building northwest of the state will keep a moderate
to locally strong trade wind flow in place over the next couple
days. As a result, a small craft advisory (sca) remains in effect
for the typically windy waters around maui and the big island. A
front dropping southward and closer to the island chain late in
the week, will ease the trade winds slightly Thursday night
through Friday night. A new high building northeast of the islands
will then strengthen the trades back to moderate and locally
fresh levels over the weekend, with scas likely being required
once again for the windier marine zones.

The current south swell will peak tonight, then gradually lower
late Wednesday into the weekend. A high surf advisory remains in
effect for south facing shores of all islands through 6 am
Thursday. A series of small long-period south and southwest swells
will move through Sunday through early next week. A larger
southwest swell is possible Tuesday through the middle of next
week.

Small northwest swells will linger over the next few days
providing some out of season surf along north facing shores.

Strengthening trade winds will give a boost in short period
choppy surf along east facing shores through Wednesday night and
again over the weekend.

Hfo watches warnings advisories
High surf advisory until 6 am hst Thursday for niihau-kauai
windward-kauai leeward-oahu south shore-waianae coast-molokai
leeward-lanai makai-kahoolawe-maui leeward west-maui central
valley-leeward haleakala-kona-south big island-big island north
and east.

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

Discussion... M ballard
aviation... H lau
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi49 min WSW 1.9 G 2.9 75°F 83°F1017.2 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI84 mi26 minW 410.00 miOvercast78°F72°F82%1017.6 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrW6W7E5S3SW4CalmW6SW5SW5W64NW6N43E6W6N5NE6N5N3SE3N5CalmSW3
1 day agoSW3CalmSW4SW6SW6SW5SW6SW5SW4CalmN5N6NE14N10N9NE11NE9N7N8N8N6NW66Calm
2 days agoSW3W3CalmSW3S5S5SW5SW4S5SW5CalmNW53N766NE8NE8NE7NE6N3NW7W5W4

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Wed -- 12:16 AM HST     0.36 feet Low Tide
Wed -- 06:04 AM HST     Sunrise
Wed -- 07:16 AM HST     1.93 feet High Tide
Wed -- 11:09 AM HST     Moonset
Wed -- 12:55 PM HST     0.85 feet Low Tide
Wed -- 06:19 PM HST     1.77 feet High Tide
Wed -- 06:49 PM HST     Sunset
Wed -- 10:58 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.60.91.31.61.81.91.91.71.41.10.90.80.91.11.41.61.81.71.61.310.7

Weather Map and Satellite Images
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wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (4,6,7,8)
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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.