Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Hilo, 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 6:46PM Saturday August 19, 2017 10:01 PM HST (08:01 UTC) Moonrise 3:58AMMoonset 5:21PM Illumination 4% 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
    EDIT      (on/off)   Help
PHZ122 Big Island Windward Waters- 924 Pm Hst Sat Aug 19 2017
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 4 feet. Scattered showers.
Sunday night..East winds 20 knots. Wind waves 4 feet. Showers likely.
Monday..East winds 15 knots. Wind waves 4 feet. Showers likely.
Monday night..East winds 15 knots. Wind waves 4 feet. Showers likely.
Tuesday..East winds 15 knots. Wind waves 5 feet. Occasional showers in the morning, then showers likely in the afternoon.
Tuesday night..East winds 15 knots. Wind waves 6 feet. Occasional showers.
Wednesday..East winds 15 knots. Wind waves 6 to 7 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. Scattered showers.
PHZ100 924 Pm Hst Sat Aug 19 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 Sunday through Tuesday.

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


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxhw60 phfo 200648
afdhfo
area forecast discussion
national weather service honolulu hi
848 pm hst Sat aug 19 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 Sunday 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 140w 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 Sunday 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
scattered showers across these same areas. Increased low cloud
cover is noted east of about 152w, along the leading edge of an
expected increase in tropical moisture. Afternoon soundings show
either no inversion or one much weaker than at this time
yesterday, another sign of increased troughing aloft. Hilo had
more moisture than lihue, with 1.32 versus 0.98 inches of pw.

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 Sunday afternoon
through the day Tuesday. This threat will start with the potential
for thunderstorms across leeward portions of the big island Sunday
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
Sunday 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
Vfr conditions will continue at all TAF sites with brief MVFR
conditions expected mainly for the windward sites this evening.

As an area of enhanced moisture from the east reaches the eastern
islands overnight, MVFR conditions will become more widespread
over windward areas. No airmets are currently in effect but one
may be needed overnight for mountain obscuration over eastern
portions of the state.

Marine
Winds and seas are expected to remain below small craft advisory
levels through early next week as a trough aloft helps weaken the
pressure gradient. The trough may make showers more active, and
could even produce some thunderstorms Sunday through Tuesday.

Wind speeds will increase again later next week.

Surf along south facing shores will continue to lower overnight
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. For more detailed surf
information, see the latest collaborative nearshore swell and
wind forecast at

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 1 mi50 min SW 2.9 G 4.1 77°F 81°F1015.4 hPa
51206 7 mi35 min 81°F4 ft
KWHH1 45 mi44 min NE 2.9 G 4.1 81°F 83°F1014.1 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last
24hr
W7
NE3
N6
G9
E6
G11
W6
NW7
SW5
SW4
SW8
SW5
E1
NE3
SW4
NW5
NE6
G9
NW8
NW5
NE6
G9
NE9
NE7
G10
NE6
SE2
SW2
SW3
1 day
ago
SW5
W7
E4
G7
SW6
W5
SW3
S2
SW4
SW3
SW3
NW2
N3
NE8
G11
N6
N4
G7
NE8
NE9
G12
NE7
G11
NE8
NE7
G10
NE4
NE4
G7
NE2
G5
S2
G5
2 days
ago
S2
SW2
SW1
SW2
N6
N4
G7
N5
N7
NE9
NE8
G12
NE9
NE11
NE13
NE7
G10
NE6
G9
N7
NW5

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi69 minWSW 410.00 miMostly Cloudy76°F72°F88%1015.3 hPa

Wind History from HTO (wind in knots)
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
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hrNW7CalmCalm3CalmNW5SW4SW5W5CalmE7E5W6NW74NW7NE7E6NE9NE6CalmCalmSW4SW4
1 day agoW63CalmW3SW3SW3SW4SW5SW5CalmN5N4N6N6N10N9NE9NE7NE7NE7NE3NE3SW5Calm
2 days agoW5W3SW4W3W4SW4SW5SW5S4CalmCalmE3N4NE8N8E9N10N9NE8NE6NE4NE4NW3NW3

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
Hilo
Click for Map
Sun -- 01:47 AM HST     1.70 feet High Tide
Sun -- 04:59 AM HST     Moonrise
Sun -- 06:01 AM HST     Sunrise
Sun -- 07:50 AM HST     -0.35 feet Low Tide
Sun -- 02:46 PM HST     2.99 feet High Tide
Sun -- 06:13 PM HST     Moonset
Sun -- 06:44 PM HST     Sunset
Sun -- 09:13 PM HST     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.71.51.10.60.1-0.2-0.3-0.10.41.11.82.52.932.72.21.610.50.30.40.7

Tide / Current Tables for Kawaihae, Big Island, Hawaii
   EDIT      (on/off)   Help   One Week of Data
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
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (4,6,7,8)
      (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.