Thursday, July18, 2019 L-36.com


Marine Weather and Tides
Nanawale Estates, HI

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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 5:49AMSunset 7:03PM Wednesday July 17, 2019 11:35 PM HST (09:35 UTC) Moonrise 8:00PMMoonset 6:32AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 956 Pm Hst Wed Jul 17 2019
.small craft advisory in effect through Friday afternoon...
Rest of tonight..East winds to 25 knots. Wind waves 6 feet. SWell southeast 4 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 6 feet. SWell southeast 3 feet. Scattered showers.
Thursday night..East winds to 25 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers.
Friday..East winds to 25 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 feet. SWell southeast 3 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 5 feet. Scattered showers through the night.
Sunday..East winds 15 knots. Wind waves 4 to 5 feet. SWell southeast 3 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 4 feet. SWell southeast 3 feet. Scattered showers.
PHZ100 956 Pm Hst Wed Jul 17 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep breezy to strong trades in place through Friday. The trades will then ease over the weekend as the high weakens.


7 Day Forecast for Marine Location Near Nanawale Estates, HI
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location: 19.49, -154.81     debug


Area Discussion for -
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Fxhw60 phfo 180645
afdhfo
area forecast discussion
national weather service honolulu hi
845 pm hst Wed jul 17 2019

Synopsis
A broad area of high pressure centered far north of the islands
will continue to feed the islands with a typical summertime trade
wind pattern through early next week. Showers riding in with the
trades will favor the windward and mountain areas, with the
highest frequency of these showers occurring during the nights and
mornings. Most lee areas of the smaller islands will remain dry,
while the lee side of the big island will have its usual clouds
and a few showers every afternoon and evening.

Discussion
A 1032 mb surface high is centered about 1100 miles north of the
big island this evening, providing the islands with a nice
tradewind breeze. The high will meander around that area well into
next week. But the high will cycle through some weakening and
strengthening periods during this stretch. The high will weaken to
1029 mb about Friday, causing the trades to ease off slightly. The
high will then get reinforced around Monday night to 1031 mb,
resulting in a slight boost in the trades.

There is an upper level low at 500 mb over the central islands
this evening. It hasn't really done much, though. Low level
moisture appears limited, mainly scattered to locally broken
immediately upwind of the islands, as per latest satellite. The
locally broken applies to maui and molokai, the low inversion is
not all that strong; the bulk of the instability appears above 10k
feet. About 240 miles east of the big island is the leading edge
to a large field of low clouds consisting of a mix of cumulus and
stratocumulus clouds and possibly associated with a weak low level
trough. Roughly 200 miles further east is the beginning of a
large field of stable stratus and stratocumulus clouds, stretching
to baja california. This area of enhance low clouds is picked up
well by both GFS and ECMWF models, which has it reaching the big
island early Thursday afternoon. The area then falls apart or is
blended in with the other trade showers Thursday night. We could
be a few hours too early with the arrival of this cloud field,
with the clouds and showers reaching windward big island at day
break and oahu late tomorrow morning. So, we will be watching for
this progress of this field as the night progresses.

The upper low over the central islands will move west and stall
just west of kauai Thursday night. The upper low then deepens some
400 miles north-northwest of kauai Friday. A trough forms and
become oriented north to south over the weekend, leaving the
islands under a southerly wind flow aloft. This setup will probably
draw some high clouds over the islands from the south. Further
more, the GFS is showing the marine layer deepening from 6 to 7k
feet to 10-12k feet on Saturday afternoon over the smaller islands.

We may not see an increase in trade showers, but the showers will
be a little bit more robust or heavier with this profile. The big
island could be just outside the range of this upper low, meaning
there is the threat of thunderstorms over the interior, higher
slopes, is nill at this time.

Aviation
Relatively strong high pressure still sits well to the north of
hawaii. This will continue the recent trend of moderate to breezy
northeasterly trade winds across the island chain. Airmet tango
remains in place for moderate turbulence below 7,000ft and this
airmet will most likely continue into Thursday. Expect lower
clouds and showers on the windward slopes therefore passing
periods of MVFR conditions are possible. Otherwise,VFR for the
rest of the state.

Marine
Breezy to strong trade winds will persist through the end of the
work week with high pressure north of the state. There remains
good model agreement with the high starting to weaken some this
weekend, which will ease the winds slightly.

The small craft advisory (sca) continues for all waters in
response to the trade winds, and it may be trimmed back this
weekend as the winds weaken.

Expect choppy surf along the east facing shores with the breezy to
strong trade winds through the end of the work week. Will continue
to monitor the surf heights, but at this time expecting surf to
remain below advisory levels. East facing shores will see surf
slowly lower over the weekend as trades ease.

Some small background south and southwest swells are expected
through the weekend. An increase in surf along south facing shores
is possible early next week as a couple southwest swells arrive
in the islands.

See the latest oahu surf discussion (srdhfo) for additional
details on surf and swell.

Hfo watches warnings advisories
Small craft advisory until 6 am hst Saturday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Small craft advisory until 6 pm hst Friday for all hawaiian
waters.

H lau chevalier m ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi53 min SW 1.9 G 1.9 76°F 81°F1018.2 hPa
51206 22 mi49 min 81°F8 ft

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, HI21 mi42 minSW 310.00 miA Few Clouds74°F68°F82%1018.5 hPa

Wind History from HTO (wind in knots)
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Last 24hrCalmW3SW4SW4SW4SW6SW5CalmE5E6SW6W10W10W4SW4E10E10
G20
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1 day agoSW4SW5SW5SW5SW5SW5SW6SW5SW34SE6E12E13SE10SE7SE11S7E10CalmE6E5E84Calm
2 days agoW6W5SW4SW4SW4SW3SW4SW4W33NE8NE8NE12NE12
G17
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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 Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Thu -- 04:29 AM HST     1.25 feet High Tide
Thu -- 05:54 AM HST     Sunrise
Thu -- 07:28 AM HST     Moonset
Thu -- 09:49 AM HST     0.18 feet Low Tide
Thu -- 05:03 PM HST     2.68 feet High Tide
Thu -- 07:02 PM HST     Sunset
Thu -- 08:43 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.711.21.21.10.80.50.30.20.30.61.11.72.22.52.72.62.31.81.30.90.5

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (5,6,7,8)
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Ground Weather Radar Station South Shore, 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.