Friday, September20, 2019 L-36.com


Marine Weather and Tides
Kihei, HI

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:13AMSunset 6:25PM Friday September 20, 2019 12:34 AM HST (10:34 UTC) Moonrise 11:07PMMoonset 11:47AM Illumination 63% 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
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PHZ119 Maalaea Bay- 923 Pm Hst Thu Sep 19 2019
Rest of tonight..North winds 15 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Friday night..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers through the night.
Saturday..North winds 15 knots. Wind waves 2 feet or less. Scattered showers in the afternoon.
Saturday night..North winds 15 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Sunday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Monday..East winds 10 knots becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..Winds variable less than 10 knots becoming east 10 knots in the evening, then becoming variable less than 10 knots after midnight. Wind waves 2 feet or less.
PHZ100 923 Pm Hst Thu Sep 19 2019
Synopsis for hawaiian coastal waters.. High pressure will remain far north-northeast of the islands into next week. A trough will approach the area from the east and bring unstable, wet conditions through this weekend.


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 200636
afdhfo
area forecast discussion
national weather service honolulu hi
836 pm hst Thu sep 19 2019

Synopsis
Island weather will trend wetter through the weekend, with
diminishing trade winds and increased moisture also making it feel
quite muggy. The chances for a few locally heavy showers will
increase as well, as low pressure in the upper atmosphere develops
over the islands. A trend toward more settled trade wind weather is
in the forecast for the middle of next week as the low moves away,
but trade wind speeds will likely remain on the lighter side.

Discussion
In the short term, a somewhat dynamic situation is in place, as a
sharp trough in the mid- to upper-atmosphere is quickly digging
toward the island chain from the north. Water vapor nicely
highlights this feature, currently about 400 miles north of kauai,
and moving south near 30 mph. It will bring increasing layered high
clouds to all islands overnight, while also helping to carve out a
cut-off closed low aloft Friday night into Saturday. This low is
expected to develop just northeast of the islands, then drift slowly
west and northwest into early next week before dissipating and
moving north. Unclear how much instability this trough and
developing low will bring in the short term, but a few locally heavy
downpours can't be ruled out overnight into Friday as divergence
aloft associated with the trough moves from north to south across
the islands. With moderate to locally breezy trade winds in the low-
levels supplied by a surface high to the distant northeast, the most
likely area for a downpour will be windward areas, while the trades
will also keep showers from sitting over any one area for too long.

A brief period of convergence aloft summat increased stability
(and decreased high clouds over the western islands) is highlighted
by latest model guidance as the upper trough stalls over the islands
during the day Friday, and before the low aloft consolidates. From
Saturday into Tuesday, the low will move slowly west, and will
induce the development of a low-level trough over the area that will
weaken the low-level gradient, leading to light winds that will
favor an east to southeast direction. Layered high clouds south and
east of the low's center will spread from the big island to the
other islands by Sunday and Monday, and periods of considerable
cloudiness are possible.

500 mb temperatures are forecast to drop 4-5 degrees c through the
weekend (bottoming out near -10c), as the low aloft moves directly
over the island chain. Although only about one standard deviation
colder than normal, given the unusually warm water temperatures near
the islands and the expected increase in low-level moisture, locally
heavy showers and thunderstorms will be possible, and may need be
added to the forecast overnight. Difficult to pinpoint exactly where
and when these would occur, but the diminished winds may allow sea
breezes to drive heavy shower development over leeward and interior
areas during the afternoons and evenings, while the light east to
southeast winds deliver windward showers that would favor nights and
mornings. The peak of the instability and deep moisture is expected
Sunday and Monday, so those with weekend outdoor plans should plan
accordingly. A flash flood watch may be required at some point, but
timing and confidence do not support its issuance at this time.

The low aloft will move west of the islands Tuesday before being
drawn northward into the circulation of a new low aloft that is
forecast to approach from the distant northwest by the middle of
next week. This appears to allow a mid-level ridge to build over the
islands from the northeast, bringing a more settled weather pattern,
although trade wind speeds look to remain light as a surface ridge
will be just north of the area. Another low aloft may move toward
the islands from the northeast by the end of next week as light to
moderate trade winds prevail.

Aviation
Trade wind flow continues, but a low northwest of the state will
bring an uptick in clouds and showers to the island chain for
Friday. Mid and high level clouds associated with this low are
beginning to fill in over the state from west to east. Airmet zulu
for icing may be needed later on tonight.

Brief periods of MVFR conditions are possible through tonight for
windward areas, especially the big island, but overall,VFR should
prevail.

Marine
Fresh to locally strong, easterly trade winds will continue through
Friday. A small craft advisory remains in effect for most of the
typical windy areas around maui and the big island. Winds will
gradually weaken into the weekend as a surface trough approaches
from the east. The trough will increase showers starting Saturday,
as well as shift winds out of the southeast by Sunday, allowing sea
and land breezes to develop over leeward areas.

A series of small swells from the southwest and south are expected
through the rest of this week. A small northwest swell is possible
late in the weekend into early next week. A small east swell from
tropical cyclone kiko will persist into the weekend.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Friday for pailolo channel-
alenuihaha channel-big island leeward waters-big island
southeast waters.

Discussion... Birchard
aviation... Dye
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi53 min NE 12 G 19 79°F 1014.6 hPa
51213 29 mi35 min 83°F3 ft
51202 - Mokapu Point, HI (098) 80 mi35 min 82°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI10 mi41 minNE 1210.00 miOvercast80°F69°F69%1014.7 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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2 days agoCalmE4E8CalmSE6CalmE7E6NE6E13
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Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Fri -- 01:24 AM HST     0.40 feet Low Tide
Fri -- 06:14 AM HST     Sunrise
Fri -- 08:57 AM HST     2.08 feet High Tide
Fri -- 11:46 AM HST     Moonset
Fri -- 03:32 PM HST     0.77 feet Low Tide
Fri -- 06:23 PM HST     Sunset
Fri -- 08:47 PM HST     1.11 feet High Tide
Fri -- 11:07 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.40.40.60.91.31.61.822.121.81.51.20.90.80.80.90.911.11.11.10.9

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 06:14 AM HST     Sunrise
Fri -- 06:48 AM HST     1.91 feet High Tide
Fri -- 11:47 AM HST     Moonset
Fri -- 12:42 PM HST     1.43 feet Low Tide
Fri -- 03:53 PM HST     1.51 feet High Tide
Fri -- 06:23 PM HST     Sunset
Fri -- 11:06 PM HST     Moonrise
Fri -- 11:51 PM HST     0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.60.91.21.51.71.91.91.81.71.61.51.41.41.51.51.51.51.41.210.80.60.5

Weather Map
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wmap_P
GEOS 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

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Wind Forecast for (6,6,7,8)
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Ground Weather Radar Station Kohala, HI
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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.