Friday, September25, 2020
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Marine Weather and Tides
Hermosa Beach, 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 6:43AMSunset 6:46PM Friday September 25, 2020 6:16 AM PDT (13:16 UTC) Moonrise 3:36PMMoonset 12:43AM Illumination 58% Phase: Waxing Gibbous; Moon at 8 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- 326 Am Pdt Fri Sep 25 2020
Today..SE winds around 10 kt, becoming W 10 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 3 to 5 ft at 10 seconds. Patchy fog in the morning.
Tonight..W winds 10 to 15 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. W swell 3 to 5 ft at 9 seconds. Patchy fog after midnight.
Sat..Winds variable 10 kt or less, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 to 4 ft at 12 seconds and S 2 ft at 11 seconds. Patchy fog in the morning.
Sat night..W winds 10 kt, becoming se 5 to 10 kt after midnight. Wind waves 2 ft or less. Mixed swell W 2 to 3 ft at 11 seconds and S 2 ft at 12 seconds. Patchy fog after midnight.
Sun..SE winds 5 to 10 kt, becoming W 10 kt in the afternoon. Wind waves 2 ft or less. Mixed swell W 2 ft at 11 seconds and S 2 ft at 12 seconds. Patchy fog in the morning.
Sun night..W winds 10 kt in the evening, becoming variable 10 kt or less. Wind waves 2 ft or less. Mixed swell W 2 ft at 11 seconds and S 2 ft at 13 seconds.
Mon..Winds variable 10 kt or less early, becoming W 10 kt. Wind waves 2 ft or less. Mixed swell W 2 ft and S 2 ft.
Tue..W winds 10 to 15 kt. Wind waves 2 ft. Mixed swell W 2 ft and S 2 ft.
PZZ600 326 Am Pdt Fri Sep 25 2020
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 09z, or 2 am pdt, a 1022 mb surface high was located 800 nm west southwest of point conception. A 1005 mb thermal low was centered near las vegas. Strong northwest winds and large seas will continue across the outer and northern coastal waters into the weekend.


7 Day Forecast for Marine Location Near Hermosa Beach, CA
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location: 33.85, -118.4     debug


Area Discussion for - Los Angeles/Oxnard, CA
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FXUS66 KLOX 251305 AFDLOX

Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 605 AM PDT Fri Sep 25 2020

SYNOPSIS. 25/317 AM.

Slight cooling trend for today across the region, then high pressure starts to build in allowing for a moderate warming trend this weekend. More significant warming expected early next week as offshore winds are expected to strengthen early next week with triple digit heat possible for valleys and highs reaching the 90s for some coastal areas, especially across Los Angeles and Ventura Counties through mid week.

SHORT TERM (TDY-SUN). 25/603 AM.

Latest GOES-W Fog Product Imagery indicated low clouds across the L.A. Coast and much of the San Gabriel Valley this morning. Low clouds were also starting to move into the SE portion of the San Fernando Valley. With a Catalina Eddy spinning up, low clouds have continued to expand north across the Ventura Coast and into the eastern portion of the Santa Barbara South Coast this morning. The latest AMDAR Soundings around LAX indicated the marine layer around 1000 ft deep this morning. The marine layer influence will bring some widespread cooling to coast and coastal valleys today. Overall, expect 3-6 degrees of cooling,with the Central Coast experiencing the best cooling as Pismo Beach which reached 91 yesterday is likely to lower back to the upper 60s to lower 70s as offshore flow gives way to cooler NW flow today across the Central Coast. Highs will be around normal for this time of year today with most valleys in the mid to upper 80s except lower 90s around the western portion of the San Fernando Valley including Woodland Hills. Coastal areas will be mild with high temps ranging from the upper 60s to lower 80s inland.

The wind advisories that were in effect for the Santa Barbara South Coast and adjacent foothills as well as the L.A. and Ventura County Mountains have been cancelled as winds were struggling to reach advisory thresholds. There will be local gusts between 30-40 mph across the L.A. and Ventura County Mountains through early this morning.

For tonight into Saturday, an eddy across the SoCal Bight will continue to gin-up low clouds across the L.A. and Ventura Coastal areas. Although high pressure aloft will start to build in from the west and help suppress the marine layer depth, the Catalina Eddy generally wins the battle and the marine layer could be deep enough to filter into the San Gabriel and possibly the San Fernando Valleys by late Tonight into Saturday morning. There is a chance that Lompoc/Santa Maria could see some locally dense fog in the early evening hours, but offshore flow from the San Lucia Mtns will scour out any low clouds across the Central Coast tonight into Saturday morning. The LAX-DAG gradient will be somewhat weaker Saturday and with high pressure building high temps will trend upward 3-6 degrees overall. Additional warming is expected Sunday as high pressure expands across all of California into Arizona. Some weak offshore flow across interior will bring some local gusty north to northeast winds across the mountains and downslope into a few wind prone valley locations. This will allow for highs to reach the mid to upper 90s across the warmest valleys, but coastal areas will likely remain fairly mild due to the pesky marine layer influence. Low clouds should be limited to the L.A. and Ventura County Coast with some dense fog possible early Sunday morning.

LONG TERM (MON-THU). 25/559 AM.

The high res NAM-WRF model is now indicating a weak to locally moderate Santa Ana Wind event developing Monday morning. Strongest gusts look to be 35 to 45 mph across the usual wind prone passes and canyons of L.A. and Ventura Counties. With strong high pressure aloft locked in over much of the western states from Washington to Arizona and a storm system diving south out of Canada over the Rockies, cold air behind the system will build in over Utah/Col causing a tightening offshore gradient to develop Monday morning. The NAM- WRF is advertising LAX-DAG -5.5MB as this is the first run of the NAM to go out that far. The European model is showing a stronger offshore gradient on Tuesday, but the offshore trends look good for both Monday/Tue, with weaker offshore gradients continuing Wed/Thu. The bottom line is there will be hot and dry conditions across the forecast area with gusty Santa Anas a good possibilty both Monday and Tuesday mornings into the early afternoon hours. Tue/Wed are likely to be the hottest days with warmest valleys reaching 103-105 degrees while coastal areas across LA/Ventura Counties will reach the upper 80s to mid 90s. With the weak offshore lingering into Thursday, expect only a few degrees of cooling with best cooling likely across coastal areas as the seabreeze should kick in but still remain well above normal for coast and valleys. The Antelope Valley will remain in the mid 90s early in the week, then warm a few degrees as the offshore winds let up. Low clouds should remain off the coast, but there could be a few coastal areas that could see some patchy dense fog if fog makes it to the immediate coast possibly Wed/Thu mornings. There will be a few record-breaking temperatures possible during this event, even though it's not expected to be as hot as the early Sept heat wave. No heat watches are needed at this time, however, it's very likely that heat advisory levels will be reached in the valleys and possibly the mountains on the hotter days. The other weather factor next week will be the potential for large plume growth and rapid fire spread with any new or existing fires due to the weak instability and mixing heights above 10,000 ft each day.

AVIATION. 25/1225Z.

At 1149Z, the marine layer was around 1000 ft deep at KLAX. The top of the inversion was around 2400 ft with a temp of 22 C.

Low clouds were widespread across coastal sections of L.A. County and the San Gabriel Valley. Clouds may push into the San Fernando Valley for a couple of hours this morning, and will likely push into immediate coastal sections of VTU County and southern SBA County. Some patchy low clouds and dense fog have formed in western portions of the Santa Ynez Valley and adjacent interior portions of the Central Coast.

Conds were mostly LIFR to VLIFR, except IFR across most coastal sections of L.A. County.

Skies should clear by mid morning in most areas, except possibly late morning at the beaches of western L.A. County.

Expect low clouds to be confined to coastal sections of L.A. and VTU Counties tonight, with mostly IFR or possibly LIFR conds expected. Conds may rise to MVFR across L.A. County near daybreak Sat.

KLAX . Moderate confidence in the 12Z TAF. There is a 20-30% chance that IFR conds will persist through 16Z, There is a 20-30% chance that IFR cigs will arrive as early as 05Z this evening. Any east winds are expected to remain less than 7 knots.

KBUR . Low to moderate confidence in the 12Z TAF. There is a 30-40% chance that skies will remain clear this morning. There is a 20-30% chance of LIFR cigs after 09Z tonight.

MARINE. 25/336 AM.

Across the outer waters, NW winds are expected to increase to marginal Gale Force levels again today, then continue through late tonight. After that, Small Craft Advisory (SCA) level winds are expected to continue through Sun morning, except probably just late Sat night across the southern zone (PZZ676). Then, SCA conds are not expected through Tue. Large seas will affect the outer waters through Saturday, then will slowly subside.

Across the inner waters north of Point Sal, SCA level winds are expected this afternoon and evening, and again Saturday afternoon and evening. Seas will likely remain above 10 feet when winds drop off tonight and Sat morning, so that SCA has been extended through Sat evening. Seas will remain large through Sat morning, then will slowly subside.

Across the inner waters south of Pt Conception, there is a 30% chance of SCA level winds across western portions of the Santa Barbara Channel late this afternoon through late tonight. Otherwise, SCA conds are not expected through Tue.

LOX WATCHES/WARNINGS/ADVISORIES. CA . High Surf Advisory in effect until 9 AM PDT Saturday for zones 34-35. (See LAXCFWLOX). PZ . Small Craft Advisory in effect until 9 PM PDT Saturday for zone 645. (See LAXMWWLOX). Gale Warning in effect until 3 AM PDT Saturday for zones 670-673-676. (See LAXMWWLOX).

.HAZARD POTENTIAL OUTLOOK (SUN-THU).

Dangerously hot weather and near critical fire weather conditions are possible all of next week as strong high pressure builds across southwest California.



PUBLIC . Kaplan AVIATION . DB MARINE . DB SYNOPSIS . Kaplan

weather.gov/losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXAC1 9 mi94 min SE 7 G 8.9
BAXC1 10 mi94 min E 8.9 G 11
OHBC1 - 9410660 - Los Angeles, CA 11 mi46 min 65°F1013.1 hPa
PSXC1 11 mi46 min SSE 5.1 G 8
AGXC1 12 mi94 min E 6 G 7
46221 - Santa Monica Bay, CA (028) 12 mi53 min 69°F3 ft
ICAC1 - 9410840 - Santa Monica Pier 12 mi46 min ENE 5.1 G 8 64°F 69°F1013.2 hPa
PFDC1 12 mi100 min E 7 G 8
PFXC1 12 mi46 min SE 8.9 G 9.9
PRJC1 14 mi46 min ESE 7 G 8.9
46256 15 mi20 min 66°F4 ft
46268 15 mi46 min 67°F2 ft
46222 - San Pedro, CA (092) 17 mi25 min 66°F4 ft
46253 22 mi20 min 67°F4 ft
46025 - Santa Monica Basin - 33NM West Southwest of Santa Monica, CA 35 mi26 min E 7.8 G 12 67°F 70°F3 ft1012.3 hPa65°F

Wind History for Los Angeles Berth 161,
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hawthorne, Hawthorne Municipal Airport, CA6 mi23 minESE 510.00 miSmoke67°F61°F81%1012.8 hPa
Los Angeles, Los Angeles International Airport, CA6 mi23 minESE 55.00 miFog/Mist65°F62°F90%1012.6 hPa
Long Beach, Long Beach Airport, CA13 mi23 minESE 39.00 miOvercast66°F62°F87%1012.8 hPa
Los Angeles / USC Campus Downtown, CA13 mi24 minN 06.00 miOvercast with Haze67°F61°F81%1012.3 hPa
Fullerton, Fullerton Municipal Airport, CA22 mi23 minSE 47.00 miOvercast68°F62°F81%1012.4 hPa
Burbank - Bob Hope Airport, CA24 mi23 minSSE 310.00 miFair63°F50°F63%1011.7 hPa

Link to 5 minute data for KTOA

Wind History from TOA (wind in knots)
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Last 24hr----------------------------34E5E4CalmW11W12W9W13W12
1 day ago----------------------------CalmCalmNW5W7W9W8W19W16W14W10
2 days ago----------------------------W3CalmW8W9W13W12W14W13W16W13

Tide / Current Tables for El Segundo, Santa Monica Bay, California
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El Segundo
Click for Map
Fri -- 12:11 AM PDT     0.19 feet Low Tide
Fri -- 12:43 AM PDT     Moonset
Fri -- 06:44 AM PDT     Sunrise
Fri -- 07:19 AM PDT     3.94 feet High Tide
Fri -- 11:56 AM PDT     2.88 feet Low Tide
Fri -- 03:35 PM PDT     Moonrise
Fri -- 05:48 PM PDT     5.06 feet High Tide
Fri -- 06:45 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.81.62.43.13.73.93.93.63.332.933.444.54.95.14.84.13.12.11

Tide / Current Tables for Los Angeles Harbor, Mormon Island, California
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Los Angeles Harbor
Click for Map
Fri -- 12:00 AM PDT     0.20 feet Low Tide
Fri -- 12:42 AM PDT     Moonset
Fri -- 06:43 AM PDT     Sunrise
Fri -- 07:10 AM PDT     4.01 feet High Tide
Fri -- 11:45 AM PDT     3.00 feet Low Tide
Fri -- 03:34 PM PDT     Moonrise
Fri -- 05:39 PM PDT     5.17 feet High Tide
Fri -- 06:44 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.91.72.63.33.843.93.73.33.133.23.64.24.75.15.14.84.131.90.9

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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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.