Friday, April10, 2020
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Marine Weather and Tides
Moss Beach, CA

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 6:39AMSunset 7:42PM Friday April 10, 2020 2:38 AM PDT (09:38 UTC) Moonrise 10:10PMMoonset 7:41AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 828 Pm Pdt Thu Apr 9 2020
Tonight..NW winds around 5 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 12 seconds and sw 2 to 3 ft at 16 seconds.
Fri..NW winds up to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 11 seconds and sw 2 to 3 ft at 16 seconds.
Fri night..NW winds 5 to 10 kt. Wind waves 1 ft. Mixed swell nw 3 to 5 ft at 12 seconds and S 2 to 3 ft at 15 seconds.
Sat..W winds 5 to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft at 9 seconds and sw around 2 ft at 14 seconds.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 9 seconds and sw around 2 ft at 14 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 9 seconds and sw around 2 ft at 14 seconds.
Sun night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 9 seconds and S around 2 ft at 13 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 10 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 10 seconds. Maximum ebb current of 4.3 kt at 06:19 am Friday and 2.1 kt at 07:25 pm Friday.
PZZ500 828 Pm Pdt Thu Apr 9 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak surface low pressure circulation is now south of point conception and moving east. Winds will switch to the northwest by Friday and will increase Saturday and Sunday as high pressure a long period southerly swell will mix with a moderate northwest swell through Friday.


7 Day Forecast for Marine Location Near Moss Beach, CA
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location: 37.51, -122.56     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 100525 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1025 PM PDT Thu Apr 9 2020

SYNOPSIS. Isolated showers will continue south of the Bay Area overnight otherwise dry. A gradual warming trend will then begin tomorrow continuing through the weekend as high pressure slowly builds over the region and the upper low continues to push farther inland. More seasonable temperatures and drier conditions will persist into at least early next week.

DISCUSSION. as of 9:37 PM PDT Thursday . A forecast update was completed earlier this evening to account for light shower activity currently located across the Central Valley but poised to pass over the South Bay and Central coast overnight. The 00z nam initialized well along with short term RAP/HRRR models showing the band of showers rotating westward across the region overnight. Currently Stockton is reporting light rain with the lastest trajectories bringing that band across Santa Clara county before midnight and then across the Central Coast overnight. Model diagnostics suggest that much of the forcing is from a 80-90 kt jets streak around 300 mb that is rotating around the upper low that is still bringing all sorts of wet weather to SoCal (places like Bakersfield and LA are already much above normal for April precip). Have to tip the hat to the ECMWF which more than one week ago showed this low wobbling around the state through Friday morning while the operational gfs and much of the blended/ensemble solutions kicked the low eastward. Alas, the Euro appears to have verified best with shower chances lasting through about sunrise Friday morning for locations around the Monterey Bay and southward.

There is high confidence that the forecast finally turns dry for all Bay Area locations Friday afternoon through the weekend and into early next week. Daytime highs will climb back into the 70s away from the coast it what will feel like some of the warmest weather we've had so far this spring.

Of course in response to that the eastern part of the country will cool down with the base of the longwave trough along the Sierra where the models do show some afternoon shower chances most afternoons with the lower resolution gfs trying to show some activity across our interior hills early next week but that looks doubtful. Best forecast at this time will be dry and seasonable over the weekend through early next week. The just received 00z gfs does show another weak system by late next week with no strong ridge building yet.

PREV DISCUSSION. as of 1:56 PM PDT Thursday . Satellite imagery shows the region remains under cloudy skies as the upper low that gave us our most recent rainfall continues to spin over southern California. This pesky and persistent low has been very slow to exit the region keeping isolated showers mainly south of the Bay Area into this morning. Over the past 12 hours as much as an additional quarter of an inch of rain has fallen over the Santa Cruz and Santa Lucia Mountains. Forecast models show one last possible push of scattered showers across the region tonight, again most likely south of the Bay Area, before the upper low finally progresses southward and then inland into the southern United States.

For those who are curious, just about the entire Greater Bay Area over the past two weeks has seen above normal precipitation for this time of the year with some locations exceeding their entire April normal rainfall in just over a week. The Monterey Airport did so in a single day with 1.71" falling on April 5th. The normal April rainfall for the airport is 1.12". However, most of the area is still about 40 to 55 percent of normal for the water year so far. After a fairly wet and cooler start to April, conditions look to warm and dry out beginning tomorrow.

The upper low will finally move eastward as an upper ridge builds over the eastern Pacific. Most areas tomorrow away from the coast will be in the mid to upper 60s with some locations possibly reaching 70 degrees. Coastal areas can expect temperatures in the upper 50s to mid 60s. Gradual warming will continue through the weekend as the ridge slowly shifts closer to the west coast. More widespread low to mid 70s are expected across the interior for the latter half of the weekend and into early next week with some areas even a few degrees above seasonal normals. Looking into the longer term, the CPC 6-10 and 8-14 day outlooks both show California with above normal temperatures and below normal precipitation. Both GFS and ECMWF ensembles show dry conditions persisting into at least the middle of the month.

AVIATION. as of 10:30 PM PDT Thursday . Mostly cloudy tonight with cigs lowering to MVFR range as models show abundant low-level moisture through Friday morning. A few showers rotating around the low over southern California will bring a chance for showers from the Santa Clara Valley and East Bay valley south through Friday morning.

Vicinity of KSFO . Cigs 4000-5000 ft lowering to around 1500 ft after 09Z. Light west to southwest wind becoming southeast after 06Z.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR cigs through 21Z. A few light showers 08Z-18Z.

MARINE. as of 10:21 PM PDT Thursday . A weak surface low pressure circulation is now south of Point Conception and moving east. Winds will switch to the northwest by Friday and will increase Saturday and Sunday as high pressure A long period southerly swell will mix with a moderate northwest swell through Friday.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: RWW AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi50 min WNW 5.1 G 6 61°F1019.3 hPa
46237 - San Francisco Bar, CA (142) 19 mi38 min 55°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi28 min N 3.9 G 5.8 53°F 53°F1019.3 hPa52°F
FTPC1 - 9414290 - San Francisco, CA 21 mi50 min 58°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi28 min WNW 3.9 G 5.8 53°F 53°F1019.2 hPa
PXSC1 22 mi50 min 55°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi50 min W 7 G 9.9 54°F 1018 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi50 min W 6 G 8.9 55°F 59°F1019 hPa
OBXC1 23 mi56 min 55°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi50 min WNW 8 G 9.9 55°F 1018.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi56 min W 8 G 8.9
LNDC1 25 mi50 min WNW 5.1 G 7 55°F 1018.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi34 min Calm 53°F 1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi50 min NW 5.1 G 6 55°F 1019.3 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi50 min NW 2.9 G 4.1 54°F 57°F1018.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi50 min NW 12 G 14 55°F 1018.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi50 min WNW 8.9 G 11 55°F 58°F1019 hPa
UPBC1 43 mi50 min WNW 8 G 12
PCOC1 - 9415144 - Port Chicago, CA 47 mi50 min W 7 G 8.9 55°F 58°F1018.7 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi43 minN 010.00 miOvercast54°F51°F94%1019.3 hPa
San Francisco, San Francisco International Airport, CA13 mi42 minW 710.00 miMostly Cloudy56°F48°F77%1018.7 hPa
San Carlos Airport, CA16 mi43 minNW 410.00 miOvercast55°F50°F82%1019 hPa
Oakland, Metro Oakland International Airport, CA22 mi45 minWNW 810.00 miOvercast57°F51°F81%1019.5 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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1 day agoNW6W3NW4NW8CalmCalmW5CalmS3S8S6S6S6SW6S7S6S7S7S8S10S7S10S8S10
2 days agoCalmCalmCalmCalmCalmCalmCalmW4NW9NW8NW9NW13NW13NW17
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Fri -- 12:29 AM PDT     6.04 feet High Tide
Fri -- 06:41 AM PDT     Sunrise
Fri -- 07:07 AM PDT     -0.87 feet Low Tide
Fri -- 08:40 AM PDT     Moonset
Fri -- 01:43 PM PDT     4.69 feet High Tide
Fri -- 07:05 PM PDT     1.71 feet Low Tide
Fri -- 07:41 PM PDT     Sunset
Fri -- 11:09 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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65.95.23.92.30.7-0.4-0.9-0.60.31.42.73.84.54.74.33.52.721.71.92.73.64.7

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Fri -- 02:40 AM PDT     -0.00 knots Slack
Fri -- 06:18 AM PDT     -2.12 knots Max Ebb
Fri -- 06:40 AM PDT     Sunrise
Fri -- 08:39 AM PDT     Moonset
Fri -- 09:26 AM PDT     0.01 knots Slack
Fri -- 12:33 PM PDT     1.27 knots Max Flood
Fri -- 03:59 PM PDT     -0.00 knots Slack
Fri -- 06:51 PM PDT     -1.25 knots Max Ebb
Fri -- 07:40 PM PDT     Sunset
Fri -- 09:30 PM PDT     0.00 knots Slack
Fri -- 11:09 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.80.4-0.3-1.1-1.8-2.1-2-1.3-0.40.40.91.21.210.6-0-0.7-1.1-1.2-0.9-0.30.20.6

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    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 San Francisco/Monterey Bay Area, CA (5,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.