Friday, September18, 2020
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Marine Weather and Tides
Rossmoor, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:36AMSunset 6:55PM Friday September 18, 2020 3:07 AM PDT (10:07 UTC) Moonrise 7:56AMMoonset 8:09PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PZZ655 Inner Waters From Point Mugu To San Mateo Pt. Ca Including Santa Catalina And Anacapa Islands- 826 Pm Pdt Thu Sep 17 2020
Tonight..W winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell W 2 ft at 7 seconds and S 3 ft at 10 seconds.
Fri..Winds variable 10 kt or less, becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 8 seconds and S 2 ft at 9 seconds.
Fri night..W winds 10 to 20 kt, becoming 10 to 15 kt after midnight. Wind waves 1 to 3 ft. W swell 3 to 4 ft at 8 seconds. Patchy fog after midnight.
Sat..W winds 10 to 15 kt. Wind waves 2 ft or less. W swell 3 to 4 ft at 8 seconds. Patchy fog in the morning.
Sat night..W winds 10 to 15 kt, becoming 5 to 10 kt after midnight. Wind waves 2 ft or less. Mixed swell W 3 ft at 8 seconds and S 2 ft at 15 seconds. Patchy fog after midnight.
Sun..W winds 5 to 10 kt, becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 2 to 3 ft at 8 seconds. S swell 2 ft. Patchy fog in the morning.
Sun night..W winds 10 to 15 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. W swell 2 to 3 ft at 8 seconds. Patchy fog after midnight.
Mon..W winds 10 to 15 kt. Wind waves 2 ft or less. W swell 2 to 3 ft. Patchy fog.
Tue..W winds 15 to 20 kt. Combined seas 2 to 3 ft. Patchy fog.
PZZ600 826 Pm Pdt Thu Sep 17 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 03z, or 8 pm pdt, a 1018 mb high pressure was 550 nm W of point conception and a 1007 mb thermal low was over the gulf of california. Patchy dense fog across much the coastal waters is possible through Friday morning. Gusty nw winds across the outer waters will lead to choppy, short-period seas through Saturday.


7 Day Forecast for Marine Location Near Rossmoor, CA
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location: 33.79, -118.07     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 180627 AFDLOX

Area Forecast Discussion . UPDATED National Weather Service Los Angeles/Oxnard CA 1127 PM PDT Thu Sep 17 2020

SYNOPSIS. 17/838 PM.

Partly cloudy skies will persist through Friday except for smoky conditions for the San Gabriel Mountains and Antelope Valley. Mostly clear skies can be expected this weekend into next week, with coastal low clouds returning. There will be a modest cooling trend this weekend with additional cooling early next week due to a weak trough moving through California. Gusty north Canyon winds are expected across southern Santa Barbara County this evening, becoming stronger Friday evening.

SHORT TERM (THU-SUN). 17/832 PM.

***UPDATE***

The marine inversion early this evening was 900 ft deep at VBG and around 600 ft deep at LAX. There were plenty of mid and hi clouds streaming in from the SW (remnants of Tropical Storm Karina) with partly to mostly cloudy skies for SLO/SBA/VTU Counties, and just a few clouds over L.A. County. If there were any low clouds along the Central Coast this evening, they could not be detected in the fog product. There is still a moderate chance of low clouds and fog expanding along the Central Coast overnight, with possible dense fog, otherwise little change can be expected across the forecast area overnight.

Northerly gradients across SBA County (SBA-SMX) are expected to be -3.2 mb by 06Z according to the NAM. These gradients will help support a moderate sundowner this evening for the SBA County S coast and Santa Ynez Mtns, mainly west of Goleta. Wind gusts have reached 37 mph at the Refugio RAWS, and up to 33 mph at the Gaviota RAWS. Isolated gusts to 40 mph will be possible this evening. These winds will remain just below Advisory levels this evening before diminishing after midnight.

***From Previous Discussion***

Most of the mid level moisture was above 600 mb and convective parameters continue to show little in the way of any elevated instability with the remnant moisture through Friday as the cloud band slides south over the southern portion of the forecast area tomorrow while an upper level trough slides across the state. Although it remains fairly hazy due to the smoke over the past several days, visibility seems to be a bit better, except in and around the Bobcat Fire where smoke will continue to be problematic for portions of L.A. County, especially around the San Gabriel Valley and adjacent mountains as well as the eastern Antelope Valley through this evening, and likely on Friday.

A northerly surface gradient will develop across the Santa Barbara South Coast and adjacent foothills as well as the I-5 Corridor over the next few days. Expect locally gusty sub-advisory winds across the western portion of the SBA South Coast, mainly between Gaviota and Refugio with gusts 35-40 mph tonight, and weaker above the hills of Montecito. The gradients will strengthen Friday evening where a Wind Advisory might be needed for these same areas. Latest meteograms for Montecito and Gaviota were not too impressive, but the SBA-BFL gradient peaks out at -4.2MB early Sat morning while SBA-SMX peaks around -3.7MB Friday evening, which means should be a bit more widespread across the SBA South Coast and Santa Ynez Range. A weaker Sundowner is expected Saturday night as well, mainly between Gaviota and Refugio.

By Friday, A 565DM upper low along the Oregon coast will pivot slightly inland and an associated broad upper level trough will dig down into Southern Cal. This will push the upper ridge to the east and allow for some welcomed cooling. Overall, there will be a modest cool down from today with highs still slightly above or normal for this time of year. Low clouds are not expected to develop across coastal areas tonight due to the high clouds, but would not be surprised if low clouds do pop up around the Central Coast and southern L.A. County late tonight into Fri morning. Low clouds are likely to develop across the Central Coast Friday night into Saturday as well as the L.A. Coast due to an eddy spinning up. Santa Barbara South Coast will remain clear and the Ventura Coast will leave clear, but could see some stratus sneak up from L.A. County early Saturday morning.

Saturday and Sunday, the upper trough lingers over the region with slightly stronger onshore gradients to continue to the cooling trend to more normal for this time of year. Low clouds will become more widespread Saturday night into Sunday reaching some coastal valleys including the Santa Ynez and San Gabriel Valleys.

LONG TERM (MON-THU). 17/151 PM.

Both the GFS and EC are in good agreement with large scale features through the extended period (Mon-Thu). A shortwave within the upper trough will move across California and help deepen the upper trough Monday and Tuesday, with H5 heights ranging from 582-585 DM. Expect a couple more degrees of cooling from the weekend, with continued night through morning low clouds across most coast and some coastal valleys. There will be a slight increase in onshore flow which should allow for continued sub advisory gusty winds across the Hwy 14 Corridor into the Antelope Valley both afternoons and early evening hours.

By Wednesday, a ridge builds in from the SW and this will allow onshore gradients to relax with a 3-6 degree warming trend through Thursday and low clouds should be limited to portions of the Central Coast as well as the L.A. and Ventura Coast Tue night into Wed morning. High pressure will strengthen on Thursday which should keep low clouds off the coast Wed night into Thu morning, or possibly dense fog right along the coast.

AVIATION. 18/0616Z.

At 0515Z at KLAX, the marine layer was 400 feet deep. The top of the inversion was at 2300 feet with a temperature of 30 C.

Moderate confidence in coastal TAFs and good confidence in inland TAFs.

Cstl TAFs KSBA and south have a 20 percent chc of MVFR VIS 10Z-16Z and a 10 percent chc of LIFR Cig/Vis 11Z-15Z.

KSBA has a 30 percent chc of no restrictions and KSMX has a 10 percent chc of no restrictions. KSMX flight cat change timing could be off by +/- 90 minutes. KSMX vis will likely vary frequently between VLIFR and IFR 11Z-14Z.

KLAX . High confidence in TAF through 10Z, then moderate confidence. There is a 30% chance of OVC004 cigs or 2SM vis 10Z- 16Z. High confidence that there will be no east wind component greater than 4 kt.

KBUR . High confidence in TAF. There is a slight chance of MVFR vis due to smoke 12Z-16Z.

MARINE. 17/826 PM.

Overall, moderate to high confidence in forecast. High confidence in Small Craft Advisory (SCA) level winds continuing across the outer waters along the Central Coast to San Nicolas Island through Saturday night. From Point Conception to San Nicolas Island, there is a 40% chance of gale force gusts Friday evening. There is a 40-50% chance SCA level winds may bleed into the western portion of the Santa Barbara Channel, especially Friday afternoon and evening. Then high confidence that winds will drop below SCA level Sunday through Monday.

Patchy dense fog is possible over most of the coastal waters tonight through Friday morning.

An elevated south swell of 3 to 4 feet with a period of 9 to 10 seconds will linger through at least Friday morning.

LOX WATCHES/WARNINGS/ADVISORIES. CA . NONE. PZ . Small Craft Advisory in effect until 3 AM PDT Sunday for zones 670-673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (SUN-THU).

No significant hazards expected.



PUBLIC . Kaplan/Sirard AVIATION . Rorke MARINE . Stewart SYNOPSIS . Sirard

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRJC1 7 mi50 min WSW 5.1 G 5.1
PFXC1 8 mi50 min Calm G 1.9
PSXC1 8 mi50 min E 1.9 G 4.1
BAXC1 9 mi104 min ENE 1.9 G 1.9
46256 9 mi42 min 64°F3 ft
PFDC1 10 mi104 min NW 2.9 G 2.9
PXAC1 10 mi110 min NNE 1.9 G 1.9
AGXC1 11 mi104 min W 4.1 G 5.1
OHBC1 - 9410660 - Los Angeles, CA 12 mi50 min 64°F1011.5 hPa
46253 16 mi42 min 67°F3 ft
46222 - San Pedro, CA (092) 18 mi48 min 68°F2 ft
ICAC1 - 9410840 - Santa Monica Pier 27 mi50 min ENE 2.9 G 5.1 68°F 67°F1011.6 hPa
46221 - Santa Monica Bay, CA (028) 30 mi45 min 69°F3 ft
46268 31 mi38 min 69°F 68°F2 ft

Wind History for Los Angeles Pier J, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Long Beach, Long Beach Airport, CA5 mi75 minN 010.00 miFair69°F57°F68%1011.2 hPa
Fullerton, Fullerton Municipal Airport, CA7 mi75 minN 010.00 miFair70°F48°F47%1010.9 hPa
John Wayne-Orange County Airport, CA13 mi75 minN 010.00 miFair70°F59°F68%1011.2 hPa
Hawthorne, Hawthorne Municipal Airport, CA17 mi75 minN 010.00 miSmoke67°F59°F76%1011.2 hPa
Los Angeles / USC Campus Downtown, CA19 mi76 minN 07.00 miFair68°F57°F68%1010.8 hPa
Los Angeles, Los Angeles International Airport, CA20 mi75 minN 010.00 miMostly Cloudy66°F59°F78%1011.1 hPa

Link to 5 minute data for KSLI

Wind History from SLI (wind in knots)
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Last 24hr----------------CalmCalmCalm2Calm3SW8SW7SW6SW6SW7SW6SW5SW4CalmCalm
1 day ago----------------CalmCalmCalmCalm3SW5SW5SW8SW7SW9SW6SW5W4S3S3Calm
2 days ago----------------CalmCalmCalmS3SW5SW6S7SW5SW8SW7SW9SW8SW3CalmCalmCalm

Tide / Current Tables for Los Patos (highway bridge), California
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Los Patos (highway bridge)
Click for Map
Fri -- 05:34 AM PDT     -0.09 feet Low Tide
Fri -- 06:38 AM PDT     Sunrise
Fri -- 07:56 AM PDT     Moonrise
Fri -- 11:35 AM PDT     4.83 feet High Tide
Fri -- 05:53 PM PDT     0.19 feet Low Tide
Fri -- 06:53 PM PDT     Sunset
Fri -- 08:09 PM PDT     Moonset
Fri -- 11:49 PM PDT     4.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.94.12.91.70.60-00.61.72.944.74.84.33.32.21.10.40.20.61.52.73.84.6

Tide / Current Tables for Long Beach, Outer Harbor, Pier A, California
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Long Beach
Click for Map
Fri -- 04:30 AM PDT     -0.14 feet Low Tide
Fri -- 06:38 AM PDT     Sunrise
Fri -- 07:57 AM PDT     Moonrise
Fri -- 10:38 AM PDT     5.59 feet High Tide
Fri -- 04:49 PM PDT     0.31 feet Low Tide
Fri -- 06:54 PM PDT     Sunset
Fri -- 08:09 PM PDT     Moonset
Fri -- 10:52 PM PDT     5.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.73.41.90.7-0-00.71.93.44.75.45.553.92.61.30.50.30.81.83.24.45.35.6

Weather Map
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wmap_P
GEOS Local Image of Southwest    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
Ground Weather Radar Station Santa Ana Mtns, CA
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