Monday, September25, 2017 L-36.com


Marine Weather and Tides
Hawi, 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 6:14AMSunset 6:19PM Monday September 25, 2017 5:57 PM HST (03:57 UTC) Moonrise 11:02AMMoonset 10:29PM Illumination 30% Phase: Waxing Crescent; Moon at 5 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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PHZ121 Alenuihaha Channel- 332 Pm Hst Mon Sep 25 2017
Tonight..Northeast winds 15 knots. Wind waves 3 feet. Isolated showers.
Tuesday..Northeast winds 15 knots. Wind waves 3 feet. Isolated showers in the morning.
Tuesday night..Northeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the morning. Scattered showers in the afternoon.
Wednesday night..Northeast winds 20 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers.
Thursday..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. Isolated showers.
Thursday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. Isolated showers.
Friday..East winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers.
Saturday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Haze. Isolated showers.
PHZ100 332 Pm Hst Mon Sep 25 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will weaken as a front approaches from the northwest and a trough moves over the eastern waters. The ridge will rebuild around mid-week after the front stalls and dissipates northwest of the coastal waters on Tuesday.

7 Day Forecast for Marine Location Near Hawi, HI
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location: 20.41, -156.09     debug


Area Discussion for -
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Fxhw60 phfo 260158
afdhfo
area forecast discussion
national weather service honolulu hi
358 pm hst Mon sep 25 2017

Synopsis
A slow increase in the trades is expected over the next few days as
a surface ridge to our north strengthens. The trades will peak on
Friday at locally breezy levels. Some increase in trade wind
showers is expected Tuesday night through Wednesday night as a
band of moisture pushes across the islands. Our winds will shift
to southeast by the weekend as the ridge pushes south over the
state.

Discussion
The afternoon soundings came in rather dry with precipitable water
of only 1.03 inch at lihue and 1.10 inch at hilo, along with
relatively weak inversions near 6500 feet. Some sea breeze
cloudiness developed over leeward sections, but rain has been
quite sparse in most areas. One exception to that is over the
leeward and kau slopes of the big island where a few showers have
popped this afternoon.

The current gentle trade wind scenario is due to a weak
subtropical ridge about 300 miles NW of kauai, and a weakening
surface trough nearly stationary E of the big island near 154w.

Our trades will make a slow, gradual, and short-lived comeback
the next few days as the subtropical ridge strengthens to our
north, reaching locally breezy levels by thu.

At the same time, the airmass will remain relatively dry with
plenty of fine weather until a band of remnant moisture once
associated with the surface trough moves in from the e. Models
show this moisture getting to the windward side of the big island
late Tue night, spreading across the chain wed, and starting to
exit Wed night. This will bring us a few more windward and mauka
showers, but will not be a major rain event by any means with the
air remaining quite stable.

Changes are in the cards for the end of the week. By Friday models
are showing a fall-like low pressure center reaching 40n 170w, or
roughly 1400 mi NW of kauai. This low will not affect us directly
but it will weaken the subtropical ridge and push it rather
quickly S over the islands over the weekend. Trades will shift
rather abruptly to SE flow and weaken over the islands this
weekend. There's some minor disagreement in the models about how
much moisture will be available, but it seems likely there will be
some increase in afternoon and evening clouds and showers, as
well as considerable vog as well.

Earlier runs of the ECMWF held out hope for trade winds returning
for Sunday and Monday, but the 12z run looks a lot more like the
recent gfs, keeping SE flow going through the end of the forecast
period.

Aviation
Localized sea breezes developed across sheltered leeward areas
this afternoon, leading to afternoon cloud buildups and general
vfr ceilings. As the sea breezes weaken and leeward clouds
dissipate with sunset, windward clouds will fill back in under a
gentle trade wind pattern. Brief MVFR conditions are possible in
showers over windward and mauka areas; otherwiseVFR conditions
will prevail.

No airmets are currently in effect or anticipated.

Marine
Light to moderate trades are expected to persist through the first
half of the week as a weak surface trough approaches the islands
from the east. An upper level trough above the surface trough is
providing sufficient instability to support thunderstorms to the
east of the offshore waters. As the surface trough moves west,
some thunderstorms may develop over the eastern offshore waters on
Tuesday before the upper level trough departs to the northeast. A
return of moderate to locally fresh trades is forecast through
the second half of the week as the high pressure ridge north of
the state rebuilds. Some of the typically windier channel waters
may even reach small craft advisory levels Thursday through
Friday.

Surf is expected to remain below advisory levels through the
forecast period. Surf along south facing shores will remain small
through the week with mainly a mix of background southeast and
southwest swells expected. The next long-period pulse out of the
southwest should fill in Tuesday night through midweek, leading to
a slight increase in surf.

Small, short period, northwest swell energy should be enough to
keep the surf from going flat along north facing shores through
the week. A reinforcing north-northwest swell should reach the
local waters late Wednesday through Thursday.

Surf along east facing shores will remain small through the first
half of the week as the trades locally and upstream of the state
remain light. Small and choppy surf will likely return as the
trades fill back in through the second half of the week.

Hfo watches warnings advisories
None.

R ballard bravender kodama


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 29 mi40 min S 8 G 12 85°F 84°F1011.4 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 39 mi46 min N 7 G 8.9 79°F 82°F1013.3 hPa
51205 46 mi49 min 82°F4 ft
ILOH1 - 1617760 - Hilo, HI 72 mi46 min NNE 8 G 9.9 81°F 81°F1012.8 hPa

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI38 mi64 minN 910.00 miPartly Cloudy82°F69°F65%1013.5 hPa

Wind History from HOG (wind in knots)
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Last 24hrN9NE9N9E5E4E5NE4N3E3SE3SE5SE5SE6S3CalmN6N9N10N11N12NE12N11NE11N9
1 day agoNE13NE10NE7NE5N6NE4N3N6NE4N4N5E5NW6N5N7N9N14NE13NE14N12NE14NE13NE12NE12
2 days agoNE16NE12NE10NE10NE7NE7NE10N6NE6NE5NE3NE5N4NE3NE11NE15NE16NE17NE16NE18NE17NE17NE16N14

Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Mon -- 06:13 AM HST     Sunrise
Mon -- 06:35 AM HST     2.27 feet High Tide
Mon -- 11:01 AM HST     Moonrise
Mon -- 01:35 PM HST     0.73 feet Low Tide
Mon -- 06:14 PM HST     1.47 feet High Tide
Mon -- 06:16 PM HST     Sunset
Mon -- 10:28 PM HST     Moonset
Mon -- 11:44 PM HST     0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.711.41.82.12.22.32.11.81.51.10.90.80.70.91.11.41.51.41.310.80.6

Tide / Current Tables for Kawaihae, Hawaii Island, Hawaii
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Kawaihae
Click for Map
Mon -- 12:27 AM HST     0.21 feet Low Tide
Mon -- 06:12 AM HST     Sunrise
Mon -- 07:32 AM HST     1.83 feet High Tide
Mon -- 10:59 AM HST     Moonrise
Mon -- 02:24 PM HST     0.57 feet Low Tide
Mon -- 06:16 PM HST     Sunset
Mon -- 07:13 PM HST     0.98 feet High Tide
Mon -- 10:28 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.20.40.711.41.61.81.81.71.41.10.90.70.60.60.70.80.910.90.80.70.5

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (23,6,7,8)
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Ground Weather Radar Station Kohala, HI
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weather_mapweather_map weather_map

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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.