Monday, August21, 2017 L-36.com


Marine Weather and Tides
Kihei, 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 6:06AMSunset 6:51PM Monday August 21, 2017 3:40 PM HST (01:40 UTC) Moonrise 6:05AMMoonset 7:08PM Illumination 0% Phase: New Moon; Moon at 29 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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PHZ119 Maalaea Bay- 325 Pm Hst Mon Aug 21 2017
Tonight..North winds 20 knots. Wind waves 2 feet or less. Scattered heavy showers in the evening, then isolated heavy showers after midnight.
Tuesday..North winds 20 knots. Wind waves 2 feet or less. Isolated heavy showers.
Tuesday night..North winds to 25 knots. Wind waves 2 feet or less.
Wednesday..North winds to 25 knots. Wind waves 2 feet or less then 3 feet in the afternoon.
Wednesday night..North winds to 25 knots. Wind waves 3 feet.
Thursday..Northeast winds to 25 knots. Wind waves 3 feet.
Thursday night..Northeast winds to 25 knots. Wind waves 3 feet.
Friday..Northeast winds 20 knots. Wind waves 3 feet.
Saturday..Northeast winds 20 knots. Wind waves 5 feet.
PHZ100 325 Pm Hst Mon Aug 21 2017
Synopsis for hawaiian coastal waters.. A weak cold front far to the north has weakened the subtropical ridge of high pressure. As the front moves east, high pressure will rebuild north of the area on Tuesday and strengthen the trade winds. An upper level low will produce unstable conditions over the western waters through Tuesday.

7 Day Forecast for Marine Location Near Kihei, HI
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location: 20.75, -156.45     debug


Area Discussion for -
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Fxhw60 phfo 211948
afdhfo
area forecast discussion
national weather service honolulu hi
948 am hst Mon aug 21 2017

Synopsis
Trade winds will prevail through the week as a ridge remains to
our north. Tropical moisture overrunning the islands from the east
will maintain muggy conditions with enhanced showers through
Tuesday. Instability aloft will introduce a slight chance of
thunderstorms. Drier and windier conditions will return Wednesday
as the ridge strengthens to our north.

Discussion
Morning satellite, lightning, and radar data show moderate trade
showers moving into windward areas, along with and area of thunderstorms
about 100 miles northwest through north of kauai. The thunderstorms
are forming under an upper low that is moving slowly southward,
bringing cooler temperature aloft and instability to the
atmosphere. Showers are expected to increase statewide this
afternoon with land heating lending some extra oomph at the
surface to combine with the instability of the upper low. The
combination of the nearby upper low, afternoon land heating, and
enhanced low level moisture will bring the chance of thunderstorms
and locally heavy showers both this afternoon and possibly again
Tuesday afternoon. Overnight, showers will focus mainly over
windward slopes and mountain areas with passing showers over
leeward locations. The elevated low level moisture has brought
uncomfortable conditions with dew points in the low to mid 70's.

Muggy conditions will continue through Tuesday.

The upper level low will push southwest near kauai tonight and
Tuesday maintaining instability over the western islands. By
Wednesday, the low is expected to move farther west of kauai with
ridging building over the state from the east. A slight chance of
thunderstorms is possible mainly near kauai and oahu through
Tuesday. The possibility of afternoon upslope thunderstorms over
the big island will remain through Tuesday due to the elevated
terrain, enhanced low level moisture, and slight instability.

Outside of the thunderstorm threat, the general weather pattern
will consist of windward clouds and showers merging with
afternoon and evening leeward clouds and showers. By Wednesday,
the upper low will be far west of the islands, and the ridge to
the north is expected to rebound and drive stronger trade winds
across local waters. More stable conditions will prevail as
ridging aloft builds over the state.

Aviation
A ridge of high pressure north of the state will keep moderate
trade winds in place through tonight. Clouds and showers will
favor windward and mauka areas, but daytime heating will result in
showers across leeward areas as well. An unstable airmass over
the islands may also result in thunderstorms across portions of
the island chain this afternoon into early this evening. MVFR and
lower conditions will become more common as shower coverage and
intensity increases across the state this afternoon into this
evening. Otherwise, MVFR CIGS vsbys should remain primarily
confined to windward and mauka locales.

Airmet sierra remains in effect for mountain obscuration on the
island of oahu. Conditions should improve here later this
morning. This afternoon, mountain obscuration will likely become
an issue once again across portions of the state, and will issue
airmets as conditions develop.

Marine
A cold front far to the north of the hawaiian islands has weakened
the subtropical ridge of high pressure resulting in moderate trade
winds across the region. As the front moves eastward, high
pressure north of the state will strengthen and increase the trade
winds. The trades are expected to reach small craft advisory
criteria on Tuesday for the normally windier channels between the
islands and the coastal waters south of the big island.

The above-mentioned upper level low will continue to produce a
slight chance for thunderstorms over coastal and offshore waters
through Tuesday. The highest risk is for the waters in the west
half of the forecast area. More stable and drier conditions are
expected on Wednesday and through the second half of the week.

Surf is expected to remain small through the week. East-facing
shores should see a slight increase in surf heights as the trade
winds rebuild on Tuesday. A longer period east swell may also
arrive during the second half of the week as a result of tropical
cyclone activity in the eastern pacific. South-facing shores may
see a slight increase in surf this weekend from a swell train that
originated from a tasman sea gale. A small background southeast
swell is also expected through the forecast period.

Hfo watches warnings advisories
None.

Morrison... Discussion
kodama... Marine
jelsema... Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi52 min ENE 13 G 21 80°F 82°F1014.7 hPa
51205 19 mi61 min 80°F5 ft
51202 - Mokapu Point, HI (098) 80 mi66 min 81°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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N16
G21
N14
G18
NE10
G19
NE11
G16
N10
G19
NE9
G18
NE8
G20
N7
G15
NE12
NE8
G13
NE11
G16
NE9
G17
NE13
NE15
NE14
G17
NE10
G15
NE8
G14
NE5
G16
NE17
G22
NE20
NE21
G27
NE24
NE20
G26
NE11
G20
1 day
ago
N15
NE15
G19
NE13
G17
NE13
G16
NE11
G15
NE11
G14
NE11
G15
NE10
G14
NE9
G15
NE11
G16
N14
G18
NE5
G12
W3
NW10
N8
G12
N10
G14
N14
G18
N15
G20
N11
G14
N12
G21
NE16
G23
NE6
G25
N12
G20
N14
G18
2 days
ago
NE17
G22
NE17
G23
NE15
G22
NE14
G22
NE11
G15
NE9
G14
NE10
G14
NE7
G11
NE10
G13
N5
G9
E4
S2
W2
G5
NW4
NE1
NE4
G8
NW8
N8
NW12
G16
N12
G16
NE14
G18
N14
N15
N11
G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI10 mi46 minENE 18 G 2710.00 miPartly Cloudy and Breezy84°F73°F70%1014.8 hPa
Lahaina - West Maui, HI21 mi55 minNNE 11 G 2115.00 miLight Rain81°F73°F79%1015.2 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE25
G31
NE19
G26
NE16
G23
NE18NE13NE9NE9NE12NE7NE8NE8NE12NE6E8NE9E6NE11NE14NE16
G22
NE16
G24
NE18
G25
NE21
G29
NE17
G26
NE18
G27
1 day agoNE17
G22
NE18NE18NE13NE12NE13NE12NE5NE8E6E6SE6S3SE4CalmE3NE13
G18
NE17NE18NE22NE19
G26
NE20
G28
NE22
G28
NE24
G29
2 days agoNE19
G27
NE18
G25
E15
G25
NE17
G22
NE11NE11NE12NE5NE10N7E5SE6CalmCalmE6N5NE6NE12NE14NE16NE20NE18NE18NE19

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Mon -- 03:42 AM HST     1.48 feet High Tide
Mon -- 06:05 AM HST     Moonrise
Mon -- 06:06 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 09:05 AM HST     0.03 feet Low Tide
Mon -- 04:08 PM HST     2.63 feet High Tide
Mon -- 06:50 PM HST     Sunset
Mon -- 07:07 PM HST     Moonset
Mon -- 10:36 PM HST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.91.21.41.51.30.90.50.200.10.50.91.522.42.62.52.11.610.50.20.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 01:45 AM HST     1.70 feet High Tide
Mon -- 06:05 AM HST     Moonrise
Mon -- 06:06 AM HST     Sunrise
Mon -- 07:54 AM HST     -0.30 feet Low Tide
Mon -- 08:31 AM HST     New Moon
Mon -- 02:49 PM HST     2.76 feet High Tide
Mon -- 06:50 PM HST     Sunset
Mon -- 07:07 PM HST     Moonset
Mon -- 09:10 PM HST     0.47 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.71.51.10.70.2-0.2-0.3-0.10.311.72.32.72.82.62.11.610.60.50.50.8

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 (21,6,7,8)
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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.