Saturday, July21, 2018 L-36.com


Marine Weather and Tides
Heeia, HI

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7/21/2018 Trying to make page Mobile Friendly

Sunrise 5:59AMSunset 7:15PM Saturday July 21, 2018 9:26 AM HST (19:26 UTC) Moonrise 2:31PMMoonset 1:23AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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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PHZ116 Kaiwi Channel- 328 Am Hst Sat Jul 21 2018
Today..Northeast winds 20 knots. Wind waves 5 feet. South swell 3 feet. Isolated showers in the morning.
Tonight..Northeast winds 20 knots. Wind waves 5 feet. South swell 3 feet. Isolated showers.
Sunday..Northeast winds 20 knots. Wind waves 5 feet. South swell 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Sunday night..Northeast winds 20 knots. Wind waves 5 feet. South swell 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Monday..Northeast winds 20 knots. Wind waves 6 feet. South swell 3 feet. Scattered showers.
Monday night..East winds 20 knots. Wind waves 7 feet. South swell 3 feet. Scattered showers.
Tuesday..Northeast winds to 25 knots. Wind waves 7 feet. Scattered showers.
Wednesday..Northeast winds to 25 knots. Wind waves 7 feet. Scattered showers.
PHZ100 328 Am Hst Sat Jul 21 2018
Synopsis for hawaiian coastal waters.. High pressure far northeast of the islands will maintain trade winds through the period. A disturbance passing south of the state may cause an uptick of trade winds early next week.

7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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Fxhw60 phfo 211400
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Sat jul 21 2018

Synopsis
Surface high pressure far north-northeast of the islands will
maintain a relatively dry trade wind weather pattern across the
islands through Sunday morning. Low clouds and light showers
transported by the trades will continue across windward and mauka
areas. An area of enhanced moisture embedded within the trades is
forecast to spread westward across the islands from late Sunday
into early next week. This will likely cause an increase in the
coverage of low clouds and showers over windward sections from
Sunday night into early next week.

Discussion
A 1034 mb surface high centered near 46n 140w has a surface ridge
extending southwest through a point about 1150 miles north of
hilo. There is also a monsoon trough, or area of low pressure, in
the deep tropics less than 600 miles south-southeast of south
point on the big island. These surface features north and south of
the islands are maintaining a relatively tight pressure gradient
across the region. As a result, the trade wind flow is moderate to
locally breezy over the islands early this morning.

Aloft, an upper-level low is centered near 28n 165w, or about 550
northwest of lihue, while an upper-level ridge is east of the big
island. The flow aloft between these features is transporting
patches of cirrus clouds across the state from the south and
southwest. The atmospheric conditions across the state are also
relatively stable early this morning, since the low-level trade
wind inversion is around 6 thousand feet at lihue, and near 7
thousand feet at hilo. Precipitable water (pw) values range from
1.2 to 1.4 inches. Note that some of this moisture is likely
related to the upper-level clouds, so the lower atmosphere remains
relatively dry. Radar reflectivity data show scattered showers
moving across the coastal waters into the windward side of the big
island, while isolated showers are moving into the windward
sections of some of the smaller islands. However, rainfall totals
at gages across the state remain meager, so these showers remain
mostly light.

The forecast models show the upper-level ridge east of the big
island will propagate slowly westward over the islands this
weekend. This will produce stable atmospheric conditions across
the area. With the relatively low pw values already in place,
expect only brief trade shower coverage over some windward
sections through Sunday morning.

Changes are expected in the dry trade wind weather pattern
starting later this weekend. Looking upstream of the islands, the
leading edge of an area of enhanced moisture is evident in
satellite imagery about 775 miles east of hilo. The forecast
models are in general agreement that the low-level trade wind flow
will eventually transport this area of moisture over the eastern
end of the island chain starting Sunday afternoon. This area will
continue spreading westward across the remainder of the state
from Sunday night into early next week. The current forecast
indicates that trade shower coverage will likely increase over
windward and mauka areas due to this enhanced moisture. Some brief
showers may also occur over leeward sections of the smaller
islands, as well as over the kona slopes of the big island each
afternoon. Since the upper-level ridge will be in the vicinity of
the islands, we do not currently anticipate heavy rainfall early
next week.

A trade wind weather pattern is expected to remain in place
through the remainder of next week. The trade winds will
gradually strengthen with breezy conditions likely starting
Tuesday. Low clouds and showers carried by the trades will
continue to favor windward and mauka areas.

Aviation
Persistent east winds will focus clouds and showers over mainly
east areas of the islands. Cloud and shower coverage will be
relatively sparse through Sunday morning.VFR conditions will
prevail. Isolated MVFR ceilings and visibility are expected, but
we do not anticipate that airmet sierra will be required for mtn
obsc. Clouds and showers will increase starting Sunday afternoon
as low level moisture spreads over the islands from the east.

Marine
Moderate to fresh trade winds will hold through the weekend over
the coastal waters. A disturbance is expected to pass south of
the state early next week, which will tighten the pressure gradient
over the state, and result in an increase of trade winds speeds
and seas.

A new long period south swell is expected to build late today,
peak on Sunday and fade during the first half of next week. A
high surf advisory has been issued for all south facing shores
beginning at 6 pm hst this evening and continuing through Monday.

No other significant swells are expected for next week.

See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.

Hfo watches warnings advisories
High surf advisory from 6 pm this evening to 6 pm hst Monday for
south facing shores of all hawaiian islands.

Discussion... Houston
aviation... Donaldson
marine... Foster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi51 min ENE 12 G 15 79°F 80°F1016.6 hPa
51210 4 mi57 min 79°F5 ft
51207 4 mi33 min 79°F5 ft
51202 - Mokapu Point, HI (098) 7 mi53 min 80°F6 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi45 min ENE 7 G 11 80°F 80°F1015.7 hPa
51211 13 mi57 min 80°F3 ft
51212 20 mi57 min 80°F4 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi90 minENE 10 G 1410.00 miMostly Cloudy80°F70°F71%1015.1 hPa
Daniel K Inouye International Airport, HI9 mi34 minNNE 1410.00 miMostly Cloudy82°F64°F56%1016 hPa
Wheeler Air Force Base / Oahu, HI12 mi31 minNE 510.00 miMostly Cloudy76°F65°F70%1015.9 hPa
Oahu, Kalaeloa Airport, HI16 mi34 minENE 11 G 1510.00 miFair82°F66°F58%1017.1 hPa

Wind History from HNG (wind in knots)
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Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Sat -- 01:23 AM HST     Moonset
Sat -- 05:14 AM HST     0.02 feet Low Tide
Sat -- 06:00 AM HST     Sunrise
Sat -- 12:48 PM HST     1.83 feet High Tide
Sat -- 02:31 PM HST     Moonrise
Sat -- 07:14 PM HST     Sunset
Sat -- 07:41 PM HST     0.64 feet Low Tide
Sat -- 11:43 PM HST     0.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.80.60.30.100.10.20.50.91.31.61.81.81.71.51.310.80.70.60.70.80.9

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Sat -- 01:22 AM HST     Moonset
Sat -- 04:30 AM HST     0.07 feet Low Tide
Sat -- 06:00 AM HST     Sunrise
Sat -- 11:52 AM HST     1.79 feet High Tide
Sat -- 02:30 PM HST     Moonrise
Sat -- 07:03 PM HST     0.66 feet Low Tide
Sat -- 07:14 PM HST     Sunset
Sat -- 10:46 PM HST     0.89 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.60.40.20.10.10.20.50.91.21.51.71.81.71.51.310.80.70.70.70.80.90.9

Weather Map and Satellite Images
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wmap_P
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (15,3,4,5)
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Ground Weather Radar Station Molokai, 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.