Thursday, April9, 2020
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Marine Weather and Tides
South San Francisco, 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 6:40AMSunset 7:41PM Thursday April 9, 2020 4:10 PM PDT (23:10 UTC) Moonrise 8:57PMMoonset 7:01AM Illumination 96% 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 221 Pm Pdt Thu Apr 9 2020
Tonight..SW winds up to 10 kt.
Fri..W winds 5 to 15 kt...with afternoon gusts to 20 kt.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 5 to 10 kt.
Sat night..SW winds 5 to 10 kt.
Sun..NW winds up to 10 kt.
Sun night..SW winds 5 to 10 kt.
Mon..W winds up to 10 kt.
Tue..W winds up to 10 kt.
PZZ500 221 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 leaving the southern outermost coastal waters and continues to move southward. Winds will be from the south over the coastal waters and from the east and southeast over the bays tonight, shifting to northwest Friday and becoming gusty over the weekend. Moderate northwest swell will persist through the rest of the week along with a long to moderate period southerly swell.


7 Day Forecast for Marine Location Near South San Francisco, CA
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location: 37.65, -122.36     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 092056 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 156 PM PDT Thu Apr 9 2020

SYNOPSIS. Isolated showers may linger south of the Bay Area into tonight with areas elsewhere remaining 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 further inland. More seasonable temperatures and drier conditions will persist into at least early next week.

DISCUSSION. as of 01:56 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 curios, 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 11:08 AM PDT Thursday . for 18Z TAFs. Most airports reporting VFR-MVFR except very locally and briefly IFR, otherwise seeing improvement in ceilings and visibilities since early morning. Satellite imagery still showing a fair amount of clouds rotating east to west from the Sierra Nevada and Central Valley, also remnant low clouds from a southerly surge on the coastline. Not sure how well model output is handling boundary layer relative humidity and cloud cover which will be subject to a relatively drier continental influence as the wind flow is from the east. TAFs are otherwise near persistence, there may be another period of light rain developing from the East Bay to the South Bay and over the north Central Coast tonight and early Friday.

Vicinity of KSFO . Recent observations showing VFR with a higher ceiling since early morning. Low confidence on duration of east wind today, recent 5 minute obs show east wind at 8 knots. Wind shift to southwest or west possible in the late afternoon or evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR, light and variable winds except southeast up to 14 knots at KSNS. East winds generally decreasing to light and variable with light southeast winds tonight. A passing shower possible tonight and early Friday.

MARINE. as of 10:39 AM PDT Thursday . A weak surface low pressure circulation is located over the southern outermost coastal waters and continues to move southward. Winds will be from the south over the coastal waters and east to southeast over the bays today, shifting to northwest on Friday and becoming gusty over the weekend. Moderate northwest swell will persist through the rest of the week along with a long to moderate period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: AS AVIATION: Canepa MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi101 min WSW 5.1 G 6 58°F 58°F1016.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi101 min NNW 5.1 G 6 57°F 1015.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi101 min WSW 2.9 G 4.1
LNDC1 11 mi101 min WSW 6 G 8 59°F 1016.5 hPa
OBXC1 11 mi101 min 59°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi101 min NNW 4.1 G 5.1 57°F 1016.8 hPa
PXSC1 11 mi101 min 58°F 54°F
FTPC1 - 9414290 - San Francisco, CA 12 mi101 min WNW 5.1 G 7 58°F 59°F1017 hPa
RTYC1 - 9414523 - Redwood City, CA 13 mi101 min N 5.1 G 8 60°F 60°F1016.9 hPa
46237 - San Francisco Bar, CA (142) 17 mi101 min 56°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi133 min NNW 6 58°F 1017 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi101 min W 6 G 8.9 60°F 1017 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi101 min W 2.9 G 5.1 59°F 57°F1016.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi81 min S 7.8 G 7.8 54°F 53°F5 ft1017.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi101 min E 15 G 17 58°F 1016.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi101 min NE 9.9 G 12 57°F 58°F1017 hPa
UPBC1 30 mi101 min ENE 12 G 14
PCOC1 - 9415144 - Port Chicago, CA 33 mi101 min ENE 11 G 13 56°F 58°F1016.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi91 min SSE 5.8 G 9.7 54°F 53°F1017.3 hPa52°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi101 min ESE 8.9 G 12 58°F 1017.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi146 min E 6

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA2 mi15 minWNW 810.00 miMostly Cloudy62°F50°F65%1015.7 hPa
Oakland, Metro Oakland International Airport, CA8 mi18 minWNW 610.00 miOvercast63°F48°F58%1016.2 hPa
San Carlos Airport, CA10 mi24 minNNE 810.00 miMostly Cloudy63°F50°F64%1015.9 hPa
Half Moon Bay Airport, CA12 mi16 minSW 410.00 miOvercast55°F50°F82%1016.6 hPa
Hayward, Hayward Air Terminal, CA13 mi17 minWNW 910.00 miOvercast61°F48°F65%1016.8 hPa
Palo Alto Airport, CA17 mi2.4 hrsNE 510.00 miPartly Cloudy61°F48°F63%1016.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrSW9S11SW8SW8SW7S10CalmSW5S6S7S9S7S9SW5S4CalmSE3NE3E7E5NE7NE3N4W8
1 day agoW16W16W21W14W12W11W12W13W15W13SW8
G18
S9SW5W10SE9SW5W9W7W6SE3E5S6N4S7
2 days agoW8W8W7W6W3W4W4SW6S3S3W3S5SW3SE4SE3S5S4NE5NE4NE4NE3NE3N5W12

Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California
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Oyster Point Marina
Click for Map
Thu -- 01:44 AM PDT     7.67 feet High Tide
Thu -- 06:42 AM PDT     Sunrise
Thu -- 08:00 AM PDT     Moonset
Thu -- 08:10 AM PDT     -0.77 feet Low Tide
Thu -- 02:37 PM PDT     6.51 feet High Tide
Thu -- 07:40 PM PDT     Sunset
Thu -- 08:13 PM PDT     1.09 feet Low Tide
Thu -- 09:57 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.47.47.66.95.33.21.3-0.1-0.8-0.50.72.345.56.46.55.74.42.91.71.11.32.33.9

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
Thu -- 02:01 AM PDT     -0.00 knots Slack
Thu -- 05:33 AM PDT     -2.13 knots Max Ebb
Thu -- 06:41 AM PDT     Sunrise
Thu -- 08:00 AM PDT     Moonset
Thu -- 08:34 AM PDT     0.00 knots Slack
Thu -- 11:40 AM PDT     1.35 knots Max Flood
Thu -- 03:00 PM PDT     -0.01 knots Slack
Thu -- 06:02 PM PDT     -1.52 knots Max Ebb
Thu -- 07:40 PM PDT     Sunset
Thu -- 08:45 PM PDT     0.01 knots Slack
Thu -- 09:57 PM PDT     Moonrise
Thu -- 11:42 PM PDT     1.07 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.60-0.8-1.6-2.1-2.1-1.5-0.60.30.91.31.31.10.60-0.8-1.3-1.5-1.2-0.60.10.61

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (19,4,5,8)
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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.