Tuesday, March19, 2019 L-36.com


Marine Weather and Tides
Hilo, 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 6:24AMSunset 6:31PM Monday March 18, 2019 10:13 PM HST (08:13 UTC) Moonrise 4:29PMMoonset 4:45AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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- 953 Pm Hst Mon Mar 18 2019
.small craft advisory in effect through early Tuesday morning...
Rest of tonight..East winds 15 knots. Wind waves 5 feet. Northwest swell 11 feet.
Tuesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 9 feet. Isolated showers.
Tuesday night..East winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 9 feet. Isolated showers.
Thursday..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 8 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Thursday night..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 9 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 to 6 feet. North swell 9 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 6 feet. North swell 8 to 9 feet. Scattered showers.
PHZ100 953 Pm Hst Mon Mar 18 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the area through Tuesday. The associated ridge will shift south near the area by Wednesday as another front passes to the north. High pressure will then again build north of the state late in the week and will bring the return of fresh to strong trade winds.


7 Day Forecast for Marine Location Near Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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Fxhw60 phfo 190633
afdhfo
area forecast discussion
national weather service honolulu hi
833 pm hst Mon mar 18 2019

Synopsis
A high pressure system will drift eastward just north of the
hawaiian islands, keeping moderate trade winds in the forecast
through Tuesday. Dry stable air aloft will limit shower activity.

On Wednesday, a cold front approaching the islands from the north
will weaken the ridge and produce light winds. High pressure will
build back in over the region from Thursday onward with a cold
front bringing clouds and showers to the islands on Saturday and
Sunday. Stronger trade winds are expected to arrive with the
frontal passage.

Discussion
Satellite imagery this evening shows stable stratocumulus clouds
across the region with some clouds banking upstream of each island.

A high confidence for fair weather remains in the local area
forecast through Friday.

A surface high will drift eastward across the central pacific
basin tonight with moderate trade winds continuing through
Tuesday. By Wednesday, the surface high moves into the east
pacific and a broad trough with associated cold front will move
into the central pacific. This trough will weaken the ridge north
of the islands producing a light wind regime on Wednesday with
modified sea breezes developing over leeward sections of each
island. Large scale subsidence under the upper level subtropical
ridge will keep a stable layer aloft (trade wind inversion)
capping vertical cloud development to around 6000 feet. Shower
activity will therefore remain isolated through Wednesday.

A stronger surface high will move eastward into the central
pacific on Thursday, heralding a return to northeast trade winds
with just a slight increase in windward shower activity. A weak
cold front will drift into the islands from the north reaching
kauai on Saturday morning. Expect clouds and showers to spread
southeastward across the rest of the state through the weekend.

Model trends from both the american (gfs) and european (ecmwf)
over the last 24 hours are showing a weaker and slower moving
frontal boundary. Cloud heights on model cross sections are now
ranging between 8000 and 10000 feet, roughly 2000 feet lower than
previous operational model runs. However, surface trade winds
remain strong which will tend to focus clouds and showers over
windward and mountain areas of each island through the weekend.

Dry stable air aloft will move in behind the front and breezy
trade winds will stay in the forecast through the first half of
next week. Expect more typical isolated to scattered windward and
mauka showers through the middle of next week with the higher
trends in this range forecast during the overnight and early
morning hours.

Aviation
Tonight, surface high pressure north of the region will bring
light to moderate east northeast flow, veering to easterly by
mid-day Tuesday. Limited shallow moisture may allow for
-shra along the windward coasts and slopes. Otherwise,
vfr conditions and partly cloudy skies prevail.

No airmets are current in effect.

Marine
Moderate to locally strong trades will continue tonight, then ease
Tuesday through Wednesday as a front passes by well to the north
of the islands. A small craft advisory (sca) remains in effect for
all waters through tonight, and this will likely need to be
extended through Tuesday for portions of the marine area due to
elevated seas associated with the current large northwest swell,
with all areas forecast to drop below SCA levels by Tuesday night.

The trades will begin to re-strengthen Wednesday night as a new
high builds northwest of the state, reaching moderate to strong
speeds once again Thursday through the weekend.

Surf along north and west facing shores continues to steadily
decline this evening, but the latest buoy observations continue to
support warning level surf along north and west facing shores. As
a result, the high surf warning (hsw) remains in effect for most
north and west facing shores and high surf advisory (hsa) remains
in effect for west facing shores of the big island through
tonight. Buoys 51001 and 51101 northwest of the state continue to
show a steady decline in swell and should translate to surf
dropping below warning levels from northwest to southeast down the
island chain later tonight.

The active pattern across the northern pacific will continue
through the week with overlapping long-period northwest swells
expected Wednesday, Friday, and Sunday. The northwest swell Wednesday
and Wednesday night will be the largest of the three, which could
drive the surf close to warning levels around its peak.

Otherwise, the series of swells is expected to keep surf near or
at advisory levels along north and west facing shores Wednesday
through Saturday.

Surf along east facing shores will remain small through midweek,
then rise Friday into the weekend as strong trades return locally
and upstream. Surf along south facing shores will remain small
through the week with mainly background southerly pulses moving
through.

Hfo watches warnings advisories
High surf warning until 6 am hst Tuesday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala-big island north and east.

High surf advisory until 6 am hst Tuesday for kona.

Small craft advisory until 6 am hst Tuesday for all hawaiian
waters-
discussion... Bohlin
aviation... Jt
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi43 min NNW 6 G 7 71°F 75°F1018.6 hPa
51206 7 mi57 min 76°F11 ft
KWHH1 45 mi49 min ENE 1 G 2.9 73°F 77°F1016.5 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, HI1 mi20 minW 510.00 miA Few Clouds70°F57°F66%1019.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrN6N9NW9NW9NW9NW8NW7W6NW5W4N5NE8NE10NE9NE10N10N12N9N10N11N6N6NE7W5
1 day agoCalmW3SW4SW5SW6W5SW4SW6SW6W45N16
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2 days agoSW33SE4CalmW6SW7SW6SW6SW5SW7CalmE4E6NE8NE8NE8NE8NE5NE4E6E4NE3CalmW4

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
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Tue -- 01:58 AM HST     2.57 feet High Tide
Tue -- 05:35 AM HST     Moonset
Tue -- 06:25 AM HST     Sunrise
Tue -- 08:44 AM HST     -0.07 feet Low Tide
Tue -- 02:23 PM HST     1.72 feet High Tide
Tue -- 05:33 PM HST     Moonrise
Tue -- 06:30 PM HST     Sunset
Tue -- 08:12 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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22.42.62.421.40.80.3-0-0.10.10.61.11.51.71.71.410.50.1-0.100.40.9

Tide / Current Tables for Kawaihae, Big Island, Hawaii (2)
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Kawaihae
Click for Map
Tue -- 02:58 AM HST     2.07 feet High Tide
Tue -- 05:38 AM HST     Moonset
Tue -- 06:28 AM HST     Sunrise
Tue -- 09:40 AM HST     -0.17 feet Low Tide
Tue -- 03:23 PM HST     1.22 feet High Tide
Tue -- 05:36 PM HST     Moonrise
Tue -- 06:34 PM HST     Sunset
Tue -- 09:08 PM HST     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.622.11.91.61.10.60.1-0.1-0.200.30.711.21.210.60.3-0-0.2-0.10.2

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 (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.