Thursday, April25, 2019 L-36.com


Marine Weather and Tides
Holualoa, 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 5:53AMSunset 6:42PM Thursday April 25, 2019 2:46 PM HST (00:46 UTC) Moonrise 12:04AMMoonset 11:20AM Illumination 60% Phase: Waning Gibbous; Moon at 21 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
PHZ123 Big Island Leeward Waters- 919 Am Hst Thu Apr 25 2019
Rest of today..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet.
Tonight..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet.
Friday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet.
Friday night..North winds 10 knots west of the big island... East 20 knots near south point. Wind waves 5 feet. Isolated showers after midnight.
Saturday..West of the big island, west winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 5 feet. Isolated showers.
Saturday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers.
Monday..North winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Northwest swell 3 to 4 feet. Isolated showers.
PHZ100 919 Am Hst Thu Apr 25 2019
Synopsis for hawaiian coastal waters.. The ridge of high pressure will remain north of the state through tonight, then begin to weaken Friday through the weekend as a front stalls and dissipates northwest of kauai.


7 Day Forecast for Marine Location Near Holualoa, HI
   Hourly   EDIT   Help
location: 19.65, -156     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxhw60 phfo 251935
afdhfo
area forecast discussion
national weather service honolulu hi
935 am hst Thu apr 25 2019

Synopsis
A ridge to the north will maintain moderate trade winds today. An
approaching cold front will weaken the trades and allow the
background flow to become southeast on Friday. This will lead to
some local land and seas breezes this weekend. An upper level
trough digging into Sunday night into Monday will enhance shower
activity.

Discussion
No changes to the forecast this morning, with no short term
changes expected.

A high pressure ridge to the north will maintain the moderate
trade wind flow today. A front approaching from the northwest will
start to erode the ridge tomorrow, which will result in a
weakening of the trade flow initially, and then a switch to a more
southeasterly flow. Winds could go light enough for some local
land and seas breezes this weekend, so we can expect a few more
clouds and showers over interior parts of the islands.

The bigger weather story is an upper level trough approaching
from the northwest Sunday night through Monday. The ECMWF depicts
a more defined trough approaching kauai than the GFS right now.

Both models have 500 mb temperatures around -11 to -12 celsius but
the ECMWF has a little more moisture with the system. Temperatures
this cold at 500 mb are below normal for april, and the
precipitable water (pw) being forecast in the models between 1.30
and 1.50 inches is well above normal. The ECMWF is forecasting a
max pw near 1.60, while the GFS is a little drier. The gfs
forecast lifted index for Sunday night over kauai is around -3.

All said, this will be an unstable airmass moving over at least
the western end of the island chain. The current progression of
the trough has it approaching from the northwest and then moving
to the east, which may keep the most of the focus over kauai and
oahu.

Will likely be making some changes to the forecast for Sunday
night through Monday to beef up the pops and possibly introduce
the wording for some heavier rain. Will likely hold off on the
introduction of thunderstorms while monitoring the next couple of
model runs.

High pressure is expected to build in north of the area Tuesday
into Wednesday which will at least briefly return trades to the
area. However some moisture leftover from the above mentioned
front may be riding in on the trades.

Aviation
Trade winds will be in the moderate range today as a high
pressure ridge remains north of the state.VFR will prevail, with
only isolated areas of showers and lower ceilings in windward and
mauka sections over the individual isles.

No airmets are currently in effect.

Marine
Moderate to fresh easterly trades associated with a ridge north
of the islands will continue today, then weaken Friday into the
weekend as a cold front approaches. Winds will steadily veer out
of the east-southeast direction and trend down into the light to
moderate range Saturday (strongest eastern end of the state), then
continue into early next week. Land and sea breeze conditions
with a light background east-southeast component will result near
the coasts through this time, especially for the waters west of
maui. In addition to the winds, the shower coverage will likely
increase later in the weekend into early next week as an upper
trough and cold front begin to influence the local weather.

Although confidence remains low at this point, a thunderstorm or
two can't be ruled out Sunday through Monday as the upper trough
moves over the area.

Small but steady surf will continue along north facing shores
through the weekend due to a couple of recent systems passing north
of the islands. Swell directions associated with these small
sources will transition from the north-northwest to the north
today, then to the north-northeast Friday through the weekend.

A slightly larger northwest swell associated with a gale that has
developed around the date line near 40n (around 1300 nm NW of the
islands) is forecast to arrive late Sunday, peak Sunday night into
Monday, then ease into midweek. Surf will respond along exposed
north and west facing shores, but remain well below advisory levels.

A similar trend will continue along south facing shores due to the
recent active pattern over the southern pacific within hawaii's
swell window. A series of long-period pulses, spaced a couple of
days apart, out of the south are expected through the first half
of next week. For the long range, the powerful, near hurricane-
force, system passing south of australia yesterday will continue
eastward through Saturday. As it passes south of tasman sea and
new zealand, a decent fetch driving seas into the 20 to 25 ft
range this weekend may translate to a small southwest swell
(tasman source) for the islands next weekend (1st weekend in may)
if the fetch sets up as projected.

Minimal surf is anticipated along east facing shores due to the
local trades that are forecast to trend down locally and upstream of
the state over the weekend into next week.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst this evening for alenuihaha
channel.

Discussion... M ballard
aviation... Kinel
marine... Kino


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
KWHH1 28 mi47 min WSW 5.1 G 6 79°F 80°F1014.1 hPa (-1.8)
ILOH1 - 1617760 - Hilo, HI 50 mi47 min ENE 2.9 G 6 75°F 77°F1014.8 hPa (-1.7)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 90 mi47 min NNE 12 G 18 77°F 1014.6 hPa (-1.9)

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
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
12
PM
1
PM
2
PM
Last
24hr
SW9
SW7
SW9
W4
SW4
W5
SW4
N2
NE3
E5
NE2
NE2
G5
N4
NE3
NE3
N1
NE4
W3
W6
W8
W10
W7
W4
SW5
1 day
ago
W6
G9
E11
G20
E16
G24
SE17
G25
E10
G16
E9
G20
E10
G22
E5
G11
NE3
NE6
G10
N3
G6
E1
G4
NE4
E5
G9
E8
G14
NW3
N3
W4
NW10
W10
G14
W9
G12
W9
W8
SW7
G10
2 days
ago
W6
W6
SW3
G6
E21
G29
E13
G28
SW3
G7
NW2
S3
E12
G18
NW1
NE3
NE3
NE3
NE6
G15
SE4
G7
E5
G10
E3
G6
NW5
G8
N3
G6
SE15
G22
SE10
G20
W11
G14
W9
W7

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI0 mi54 minW 910.00 miPartly Cloudy81°F68°F65%1014 hPa

Wind History from HKO (wind in knots)
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
12
PM
1
PM
2
PM
Last 24hrSW10S11S12S8SE9SE5E10N8SE12SE7S5S4SE6S4N4CalmCalmW4SW6SW9SW9W9W9W9
1 day agoW12W8SW5SW7SW6E8E8S5SE6SE3SE6SE6S3NE53SE4NW7W7W4W8W8W9SW11SW9
2 days agoW10W9W6S7S6S6S9S5S5SE5SE6SE6SE6SE8E9SE5E9SE9S8SW10SW10SW10SW10SW12

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Kailua Kona
Click for Map
Thu -- 12:03 AM HST     Moonrise
Thu -- 04:39 AM HST     0.15 feet Low Tide
Thu -- 05:58 AM HST     Sunrise
Thu -- 09:28 AM HST     0.49 feet High Tide
Thu -- 11:20 AM HST     Moonset
Thu -- 01:10 PM HST     0.29 feet Low Tide
Thu -- 06:45 PM HST     Sunset
Thu -- 09:22 PM HST     1.67 feet High Tide
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
10.70.50.30.20.20.20.30.40.50.50.40.30.30.30.40.60.81.11.41.61.71.61.5

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
   EDIT      (on/off)   Help   One Week of Data
Napoopoo
Click for Map
Thu -- 12:03 AM HST     Moonrise
Thu -- 04:49 AM HST     0.15 feet Low Tide
Thu -- 05:58 AM HST     Sunrise
Thu -- 09:38 AM HST     0.49 feet High Tide
Thu -- 11:20 AM HST     Moonset
Thu -- 01:20 PM HST     0.29 feet Low Tide
Thu -- 06:44 PM HST     Sunset
Thu -- 09:32 PM HST     1.67 feet High Tide
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
1.10.80.50.30.20.20.20.30.40.50.50.40.40.30.30.40.50.811.31.51.71.71.5

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 (20,4,5,8)
      (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.