Monday, May20, 2019 L-36.com


Marine Weather and Tides
Hilo, 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 5:41AMSunset 6:52PM Monday May 20, 2019 4:34 AM HST (14:34 UTC) Moonrise 8:57PMMoonset 7:23AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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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PHZ122 Big Island Windward Waters- 315 Am Hst Mon May 20 2019
Today..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers.
Tonight..Southeast winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet in the evening. Scattered showers.
Tuesday..Southeast winds 15 knots. Wind waves 5 feet. Isolated showers through the day.
Tuesday night..East winds 15 knots. Wind waves 5 feet. Scattered showers in the evening, then isolated showers after midnight.
Wednesday..East winds 15 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 15 knots. Wind waves 5 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 5 to 6 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 6 to 7 feet. Mixed swell northwest 3 to 4 feet and south 3 feet. Scattered showers.
PHZ100 315 Am Hst Mon May 20 2019
Synopsis for hawaiian coastal waters.. A surface high northeast of the waters will build northeastward through tonight as a cold front approaches the state from the northwest. The front is expected to stall and dissipate northwest of the island chain Tuesday and Tuesday night, while the high far northeast of the waters strengthens and persists through rest of the week.


7 Day Forecast for Marine Location Near Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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Fxhw60 phfo 201321
afdhfo
area forecast discussion
national weather service honolulu hi
321 am hst Mon may 20 2019

Synopsis
Trade winds will become light southeasterlies today with as a
cold front approaches the state from the northwest. This front
will stall north of the islands with light and variable winds in
the forecast through Friday. Clouds and scattered showers will
favor windward mountains and interior sections of each island
mainly in the afternoon and early evening time periods. Moderate
trade winds are forecast to return just in time for the memorial
day weekend.

Discussion
High level icy cirrus clouds, riding the subtropical jet stream,
are moving across the state from southwest to northeast this
morning. Fairly stable bands of cumulus and stratocumulus clouds
are upstream of the islands drifting in on the southeasterly winds
this morning.

A 1025 mb high center far northeast of the hawaiian islands will
slowly drift eastward today as a cold front approaching the
state from the northwest breaks down the ridge north of the
islands. Decreasing pressure gradients as the front stalls north
of the islands will cause winds to veer southeasterly today as we
transition to light and a light and variable wind pattern.

A weak upper level disturbance will also pass through the western
islands today, producing a slight enhancement in clouds and
showers mainly over kauai this afternoon and evening.

Light southeasterly winds today will allow local scale sea
breezes to develop along sheltered leeward slopes as the islands
heat up relative to the ocean. A light easterly background wind
flow from Tuesday through Friday will allow a stronger land and
sea breeze circulation to dominate island weather conditions
through the end of the work week. Weather conditions will feel
hotter and more humid than normal under this light wind pattern.

Clouds and scattered showers will form along windward mountain
ranges, interior sections, and sea breeze convergence boundaries;
favoring the afternoon and early evening hours. Medium range
weather model solutions remain in good agreement with this light
and variable wind pattern through Friday.

Trade winds are expected to return just in time for the memorial
day weekend as the stalled front lifts north allowing the ridge
to slowly build back in over the islands. Subtle differences
between the american (gfs) model and the european (ecmwf) model
remain keeping our confidence for returning trades in the fair
category this far out. We continue to lean towards the GFS model
and climatology for the long range memorial day wind forecast.

Clouds and showers will then favor more typical windward and mauka
areas.

Aviation
Expect a mainlyVFR day across the main hawaiian islands area. A
ridge of high pressure located 420 nm N of kauai will be moving s
throughout today, weakening the trade winds and causing it to veer
to the SE over the western islands.

The area of low clouds and showers has moved on, clearing kauai in
the process, and thereby lowering airmet sierra for the mountains
north through east of kauai. Radar returns paint a very loose
field of showers upwind of the islands. There is a concentrated
area of showers but it is located some 45 nm north of oahu and
will likely miss kauai. Tops of the showers area between 7 and 10k
feet. Expect brief periods of MVFR ceilings and vis with these
clouds and showers, as they cross the mountain ranges. The coverage
of the clouds and showers is not expected to be extensive to
warrant airmet sierra for mountain obscuration. There is a broken
to overcast layer of cirrus clouds above fl250, covering the
islands.The cirrus should be thinning out later today as the jet
stream begins to move away from the islands.

Although the low level winds are down, there is enough vertical
speed shear at the mid to high levels, lending to the potential of
tempo moderate turbulence between fl220 and fl300. Satellite
water vapor imagery show transverse banding with the cirrus over
the islands, which is a sign of clear air turbulence. The
turbulence is expected to dissipate by 22z.

Marine
Winds have dropped below advisory levels across the typically
windy waters around maui and the big island early this morning,
therefore the small craft advisory (sca) has been cancelled. The
winds will continue to ease and shift around to the east-
southeast today through Tuesday, as a cold front approaches from
the northwest. The front will then stall northwest of the area
during the middle and latter part of the week, while high pressure
strengthens northeast of the island chain. This will bring an
increase in the east to east-southeasterly winds Wednesday through
Friday.

A series of small southwest and south swells will produce small
to moderate surf along south facing shores through the middle of
the week. Currently, we have a small background southwest swell
from the tasman sea. A reinforcing long-period south-southwest
swell is expected to build Tuesday into Wednesday. Further out, a
larger long-period south-southwest swell is expected to arrive
during the memorial day weekend, with surf possibly reaching
advisory levels along south facing shores.

The current small northwest swell will continue to decline
today, with only small surf expected along north facing shores
through Thursday. A new small to moderate sized northwest swell
is expected to arrive Friday and linger through much of the
memorial day weekend. Surf along east facing shores will remain
small through the middle of the week. A developing fetch of
moderate trades upstream of the islands could bring a boost to
east shore surf later in the week through the memorial day
weekend.

Hfo watches warnings advisories
None.

Discussion... Bohlin
aviation... Lau
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi46 min SSW 1.9 G 4.1 71°F 78°F1016.7 hPa
51206 7 mi48 min 79°F6 ft
KWHH1 45 mi52 min E 2.9 G 4.1 76°F 81°F1016.5 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi41 minSW 410.00 miMostly Cloudy71°F64°F79%1017.1 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW5SW5SW5W44E6NE10NE9NE10
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1 day agoSW3SW3CalmN3NE6N7NE7NE8N10NE8
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2 days agoSW7SW5SW5NW3N4E85E10NE6N11N9NE7N8NE3NE4CalmNW3NW3CalmCalmSW3CalmW3Calm

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
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Mon -- 04:49 AM HST     0.94 feet High Tide
Mon -- 05:45 AM HST     Sunrise
Mon -- 07:24 AM HST     Moonset
Mon -- 10:16 AM HST     -0.08 feet Low Tide
Mon -- 05:34 PM HST     2.53 feet High Tide
Mon -- 06:54 PM HST     Sunset
Mon -- 09:00 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.50.70.90.90.80.60.30.1-0.1-00.20.71.21.82.22.52.52.31.91.40.90.5

Weather Map and Satellite Images
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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.
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Wind Forecast for (10,2,3,4)
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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.