Saturday, February29, 2020
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Marine Weather and Tides
Kihei, HI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
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.

Sunrise 6:45AMSunset 6:31PM Friday February 28, 2020 9:28 PM HST (07:28 UTC) Moonrise 10:01AMMoonset 10:54PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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- 911 Pm Hst Fri Feb 28 2020
.small craft advisory in effect through Sunday afternoon...
Rest of tonight..Northeast winds to 25 knots. Wind waves 4 feet. Isolated showers through the night. Slight chance of Thunderstorms after midnight.
Saturday..Northeast winds to 30 knots. Wind waves 4 feet. Isolated showers in the morning. Slight chance of Thunderstorms through the day. Scattered showers in the afternoon.
Saturday night..Northeast winds to 25 knots. Wind waves 4 feet. Scattered showers and slight chance of Thunderstorms.
Sunday..Northeast winds to 25 knots. Wind waves 4 feet. Scattered showers and slight chance of Thunderstorms.
Sunday night..Northeast winds to 25 knots. Wind waves 4 feet. Scattered showers and slight chance of Thunderstorms in the evening, then isolated showers after midnight.
Monday..Northeast winds 10 knots. Wind waves 3 feet in the morning then 2 feet or less. Isolated showers.
Monday night..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
PHZ100 911 Pm Hst Fri Feb 28 2020
Synopsis for hawaiian coastal waters.. Strong high pressure will remain northeast of the region through the weekend. An upper low will move into the area over the weekend, which may trigger a few Thunderstorms. A weak surface trough will approach the area from the east early next week.


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 290640 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 840 PM HST Fri Feb 28 2020

SYNOPSIS. A strong high pressure system far northeast of the islands will produce windy conditions statewide through Sunday. An upper level low northeast of the Hawaiian Islands will drift over the state this weekend, keeping wet weather conditions in the forecast for all islands with isolated thunderstorms and periods of snowfall reaching the highest peaks of Maui and the Big Island. Unsettled weather will continue into the first half of next week. Improving conditions in the forecast by Wednesday, then trending towards more unsettled weather for the second half of next week.

DISCUSSION. A strong high pressure system will build above 1040 mb central surface pressure this weekend, increasing local area pressure gradients and keeping windy trade winds in the forecast through Sunday. Wind speeds are already exceeding wind advisory thresholds in portions of Maui and Hawaii Counties this evening. A Wind Advisory was issued this evening for both counties.

Meanwhile in the upper levels, a cold core low pressure system is forming northeast of the island chain. This low will drift over the eastern half of the state by Saturday morning. Unstable conditions associated with the cold core temperatures aloft will lift/weaken the subsidence inversion heights/cap producing numerous showers and isolated thunderstorms across the region through Sunday. This evenings radar imagery shows these numerous showers already moving into the windward slopes of all islands. Most leeward areas will also see periods of wet weather this weekend. Snow levels over the highest peaks of the Big Island and Maui will fall just below the 10,000 foot level. Periods of snow and ice are likely over Haleakala, Mauna Loa and Mauna Kea through Sunday. A Winter Weather Watch remains in effect from Saturday night through Sunday evening for all three mountain peaks.

Monday through Wednesday . The upper level low slowly weakens and drifts northward with lingering scattered to numerous showers in the forecast trending downward through the middle of the week. The surface high north of the islands drifts further eastward away from the state causing wind speeds to weaken down into the moderate to breezy range.

Thursday and Friday . High pressure builds back in north of the islands with trade winds increasing back up to breezy to locally windy levels across the region. A weak upper level trough will trend shower activity higher with continued unsettled weather in the forecast through Friday.

AVIATION. Strong high pressure northeast of the state will keep strong and gusty trade winds blowing across the island chain through Saturday. Clouds and showers will favor windward and mauka areas, although showers will reach leeward areas regularly due to the strength of the trades. Some temporary MVFR cigs/vsbys can be expected as showers move through windward locales, with VFR conditions expected to prevail in leeward areas.

AIRMET Sierra is in effect for mountain obscuration across windward sections of Oahu, Molokai, Maui, and the Big Island. These conditions will likely continue through the night.

AIRMET Tango is in effect for low level turbulence over and downwind of the terrain of all islands. These conditions will likely persist through the weekend. AIRMET Tango may also be needed for upper level turbulence over the western half of the state later tonight.

MARINE. Strong east-northeast trades associated with 1038 mb high pressure northeast of the state are here to stay through Monday. Pailolo and Alenuihaha Channels, Maalaea Bay and waters around South Point of the Big Island will remain near gale-force levels through Sunday. WAVEWATCH III and ECMWF-Wave guidance depict seas building into the 12-18 ft range over the weekend/early next week across a good sized area within a couple of hundred nautical miles to the northeast of the windward waters as the gradient tightens between high pressure to the northeast and a trough in the vicinity the islands. As this surface trough continues westward through the islands Tuesday through Wednesday, there may be a brief period of time when the local winds trend down into the light to moderate range for some locations (low confidence being this far out).

The Small Craft Advisory (SCA) remains in effect through the weekend for all waters due to a combination of winds and seas, which will be extended through Monday in later packages. In addition to the rough conditions, shower coverage will increase through the weekend as an upper low moves into the area.

Surf along east facing shores will steadily rise through the weekend due to the aforementioned scenario evolving over and upstream of the islands. Heights will hold around the advisory level (8 ft) through Saturday, then climb toward warning levels late Saturday night through Sunday. The advisory in place through Sunday will need to be extended through Monday in later packages.

Surf along north and west facing shores will gradually ease over the weekend as the northwest swell that peaked earlier fades. This will be the beginning a quiet stretch for north and west facing shores, which may continue through all of next week. Some of the trade wind energy, however, may wrap into exposed north facing shores each day.

Surf along south facing shores will remain small with mainly background south and south-southwest swells moving through.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST Sunday for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West-Windward Haleakala-South Big Island-Big Island North and East.

Wind Advisory until 6 AM HST Monday for Lanai-Maui Windward West- Maui Leeward West-Leeward Haleakala-South Big Island-Big Island North and East-Kohala-Big Island Interior.

Winter Storm Watch from Saturday evening through Sunday afternoon for Haleakala Summit-Big Island Summits.

Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters.



DISCUSSION . Bohlin AVIATION . Jelsema MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi58 min E 6 G 8.9 71°F 74°F1021.9 hPa
51205 19 mi58 min 75°F10 ft
51213 29 mi118 min 76°F4 ft
51202 - Mokapu Point, HI (098) 80 mi58 min 75°F9 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 mi94 minENE 710.00 miLight Rain68°F60°F76%1021.7 hPa
Lahaina - West Maui, HI21 mi3.6 hrsNE 20 G 2815.00 miPartly Cloudy and Breezy72°F59°F65%1019.6 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Sat -- 01:54 AM HST     0.59 feet Low Tide
Sat -- 06:46 AM HST     Sunrise
Sat -- 07:31 AM HST     1.21 feet High Tide
Sat -- 10:36 AM HST     Moonrise
Sat -- 01:47 PM HST     0.15 feet Low Tide
Sat -- 06:30 PM HST     Sunset
Sat -- 09:13 PM HST     1.67 feet High Tide
Sat -- 11:46 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.60.60.70.811.11.21.21.10.90.70.40.20.20.30.50.81.11.41.61.71.61.5

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sat -- 04:40 AM HST     1.64 feet High Tide
Sat -- 06:46 AM HST     Sunrise
Sat -- 10:36 AM HST     Moonrise
Sat -- 11:34 AM HST     0.26 feet Low Tide
Sat -- 06:30 PM HST     Sunset
Sat -- 06:40 PM HST     1.53 feet High Tide
Sat -- 11:42 PM HST     1.14 feet Low Tide
Sat -- 11:46 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.11.31.51.61.61.51.310.70.40.30.30.40.60.91.21.41.51.51.51.31.21.2

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (2,6,7,8)
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Ground Weather Radar Station Kohala, HI
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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 numerous 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.