Saturday, March23, 2019 L-36.com


Marine Weather and Tides
Wainaku, 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 6:20AMSunset 6:33PM Saturday March 23, 2019 11:22 AM HST (21:22 UTC) Moonrise 9:38PMMoonset 8:36AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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
    EDIT      (on/off)   Help
PHZ122 Big Island Windward Waters- 930 Am Hst Sat Mar 23 2019
.small craft advisory in effect through late this afternoon...
Rest of today..East winds 15 knots. Wind waves 4 feet. North swell 8 feet. Isolated showers late in the morning.
Tonight..East winds 20 knots. Wind waves 6 feet. North swell 7 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 6 feet. North swell 6 feet. Isolated showers through the day.
Sunday night..East winds 15 knots. Wind waves 6 feet. North swell 6 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 5 feet. Northwest swell 6 feet. Scattered showers.
Monday night..Northeast winds 15 knots. Wind waves 5 feet. North swell 5 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. North swell 4 to 5 feet. Scattered showers.
Wednesday..Southeast winds 10 knots veering south after midnight. Wind waves 4 feet. Northwest swell 4 to 6 feet. Isolated showers.
PHZ100 930 Am Hst Sat Mar 23 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the state through Sunday, then shift east and weaken Monday through Tuesday as a front approaches.


7 Day Forecast for Marine Location Near Wainaku, HI
   Hourly   EDIT   Help
location: 19.73, -155.06     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxhw60 phfo 231938
afdhfo
area forecast discussion
national weather service honolulu hi
938 am hst Sat mar 23 2019

Synopsis
Moderate to locally breezy trade winds will continue for the next
few days as surface high pressure remains north of the islands. A
band of moisture will provide a boost to windward rainfall for
kauai and oahu today. Otherwise, modest windward rainfall will
prevail through the weekend, followed by another increase in
rainfall on Monday. Trade winds steadily will drop on Tuesday and
Wednesday, and a front will likely affect portions of the state
on Thursday.

Discussion
A stable, locally breezy trade wind flow remains in place across
the state, while a band of moisture is providing a boost to
windward rainfall for kauai and oahu. The trades are being driven
by a 1028 mb high, currently located about 1,000 miles north-
northwest of kauai. Little change in the winds is expected through
the weekend as the high drifts southeastward. A band of low level
moisture is providing a boost to windward rainfall on kauai and,
to a lesser extent, on oahu, while the rest of the state is
experiencing modest windward shower activity. The band will lift
north of oahu by afternoon and will affect windward kauai into
tonight. Otherwise, expect typical windward rainfall and rather
dry leeward conditions through the weekend. The atmosphere will
remain stable with a firm low level inversion. However, an
approaching upper level trough will produce an increasing amount
of thin high clouds through the weekend.

An increase in shower activity is expected Monday. As the surface
high shifts to the northeast of the state, the band of low level
moisture currently impacting kauai and oahu will be pushed over
the entire state. Rainfall will be focused over windward slopes.

However, the upper level trough passing overhead will weaken and
lift the inversion, allowing some showers to periodically spread
to leeward areas on the easterly trade winds.

Easterly trade winds will steadily decline on Tuesday and will be
disrupted on Wednesday as a front approaches. Surface high
pressure will weaken far northeast of the state on Tuesday,
causing trades to fall to gentle to moderate strength. As the
front advances, it will push the surface ridge over the region on
Wednesday, causing winds to weaken significantly. Expect a land
and sea breeze regime to prevail, with afternoon clouds and
showers developing over interior sections. Although low level
moisture will be around seasonal average, an approaching mid to
upper level trough will create some instability. As a result, a
few, briefly heavy showers could be possible on Wednesday.

The front will affect portions of the state on Thursday. The gfs
and ECMWF models are not in agreement on the handling of this
feature. The GFS remains more progressive and pushes the front
through the islands, while the ECMWF suggests that the feature
will stall over the islands.

Aviation
High pressure to the north of hawaii will allow persistent
easterly trade winds over the state through the period. Will
monitor for low level turbulence and issue airmet tango if
necessary. Airmet sierra for mountain obscuration for kauai and
oahu for north and east sections but may be able to drop this
airmet by early afternoon. Expect periods of MVFR conditions
along the windward slopes, particularly on kauai and oahu and more
likely with the increasing possibility of windward showers
tonight, otherwiseVFR conditions across the rest of the state.

Marine
Trade winds will shift out of a more easterly direction and
strengthen into the fresh to strong category today through Monday
as high pressure builds north of the state. A combination of the
breezy trades and a north-northwest swell has pushed seas above
the small craft advisory threshold (10 ft) this morning, which is
above the wavewatch iii predicted levels by a couple of feet.

Seas will hold at these levels through today, then gradually lower
through the second half of the weekend into Monday as this north-
northwest swell eases. Trades should begin to weaken Tuesday
through midweek as the ridge shifts south toward the area and
a front approaches. Guidance continues to indicate light and
variable winds by Wednesday followed by a quick shift out of the
north Thursday as the boundary makes it into the area.

Surf along north and west facing shores will hold around advisory
levels today due to the current north-northwest swell, then
steadily ease tonight through Monday. A small reinforcement out
of a more northerly direction is expected Monday night through
Tuesday. Overlapping long-period northwest swells will fill in
through the day Wednesday and hold into the second half of the
week. Surf should remain below advisory levels Sunday through
Wednesday for north and west facing shores and potentially reach
advisory levels Thursday.

Surf along east facing shores will rise Sunday due to fresh to
strong trades. A downward trend is expected Monday through
Wednesday as the trades weaken.

Surf along south facing shores will remain small each day with
mainly background long period southerly pulses and short-period
southeast energy expected.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening for north and west
facing shores of niihau, kauai, oahu, and molokai, and for north
facing shores of maui.

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

Small craft advisory until 6 pm hst this evening for kauai
northwest waters-kauai windward waters-kauai leeward waters-
kauai channel-oahu windward waters-kaiwi channel-maui county
windward waters-big island windward waters.

Discussion... Wroe
aviation... Chevalier
marine... Foster


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi35 min 76°F 76°F1020.2 hPa
51206 6 mi37 min 76°F9 ft
KWHH1 46 mi41 min 82°F 77°F1019.3 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
Last
24hr
NE6
NE8
NE10
G13
E8
G11
E9
G12
E6
G9
E3
G7
E2
SE3
SE4
W2
E2
E4
E3
SE1
G4
S1
S2
S2
SW2
S2
SW1
W1
G5
N3
NE7
G10
1 day
ago
NE7
N4
G7
NW4
NW6
NW4
E5
NE5
NE3
W3
S1
G4
W6
G9
SW2
--
SE3
SW2
G6
SW2
SW2
G5
SW2
E1
W6
SW3
W4
G8
W2
G6
W1
2 days
ago
SE4
NE5
N4
--
W4
NW6
W3
W2
SW1
SW1
SW2
SW1
SW2
SW1
SW1
W5
SW3
S2
W3
W8
G12
W5
N8
N5
NE3
G6

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi30 minENE 810.00 miOvercast79°F61°F54%1020.6 hPa

Wind History from HTO (wind in knots)
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
Last 24hrCalmNE10E10
G16
E10E10E8E7E5E3E7SW4E7E3E4E3CalmSW4SW4SW5SW6SW54CalmNE8
1 day agoNE8N10Calm--NW7NE7NE4N4CalmW5SW4SW4W5S3SW6W5SW6W3SW3CalmS6W9W6Calm
2 days agoE6E8NE4E5W6NW6W4W3CalmSW5SW5W5SW6SW6SW6W7SW6S6SW7W8W8NE3N7N10

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
   EDIT      (on/off)   Help   One Week of Data
Kawaihae
Click for Map
Sat -- 05:42 AM HST     1.70 feet High Tide
Sat -- 06:24 AM HST     Sunrise
Sat -- 08:39 AM HST     Moonset
Sat -- 11:49 AM HST     -0.07 feet Low Tide
Sat -- 06:26 PM HST     2.10 feet High Tide
Sat -- 06:35 PM HST     Sunset
Sat -- 09:41 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.20.30.611.41.61.71.51.20.70.30-0.10.10.511.51.92.12.11.81.510.6

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Kohala, HI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.