Thursday, February20, 2020
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Marine Weather and Tides
Sunnyvale, 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 6:49AMSunset 5:53PM Thursday February 20, 2020 10:09 AM PST (18:09 UTC) Moonrise 5:19AMMoonset 3:13PM Illumination 9% Phase: Waning Crescent; Moon at 27 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- 827 Am Pst Thu Feb 20 2020
Today..NE winds 5 to 10 kt.
Tonight..N winds up to 10 kt.
Fri..NE winds up to 10 kt.
Fri night..NW winds around 5 kt.
Sat..SW winds 10 to 20 kt with gusts up to 30 kt.
Sat night..W winds 5 to 15 kt with gusts up to 25 kt.
Sun..W winds 5 to 10 kt.
Mon..NW winds 5 to 10 kt.
PZZ500 827 Am Pst Thu Feb 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwesterly winds are forecast to prevail over the coastal waters today. A low pressure system will arrive on the central coast on Friday, bringing with it a chance of light rain to the waters south of point pinos. Dry weather returns Sunday and Monday. A moderate northwest swell persists through the week along with a light southerly swell.


7 Day Forecast for Marine Location Near Sunnyvale, CA
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location: 37.42, -121.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 201735 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 935 AM PST Thu Feb 20 2020

SYNOPSIS. Warming temperatures continue through the end of the week as the next system passes to the south. A chance of rain is possible for the Central Coast on Friday into Saturday morning, though accumulations are forecast to be minimal. The Bay Area will see dry conditions and mild temperatures are forecast to continue through next week.

DISCUSSION. as of 08:00 AM PST Thursday . Water vapor imagery shows a 553dm upper low located approx 450 miles west of San Francisco. Moisture in the southwesterly feed ahead of the feature has resulted in a band of high clouds over the area this morning. Meanwhile at the surface, some patchy fog and marine stratus evident over land earlier this morning has been advected offshore by the south/southeast winds ahead of the front. Afternoon temperatures today are forecast to be in the low to mid 60s near the shorelines and upper 60s to low 70s inland, which is about 3-7 degrees above normal for this time of the year. Tomorrow will be several degrees warmer (6-14 degrees above normal) with shoreline highs in the mid to upper 60s and low to mid 70s inland.

Models show this upper low swinging along the southern periphery of the Central coast and into Southern California later Friday and into the early portion of the weekend. Ensemble members continue to suggest the possibility of light rain for the southern portion of the forecast area, ie from Santa Cruz mountains and southward, with the most over the higher terrain of Monterey county (ie Big Sur). Model ensemble precipitation amounts range wildly, with nearly half of the members suggesting little to no precipitation. Meanwhile, the wettest ensemble members suggest up to half of an inch or more for the Big Sur peaks, so there remains quite a bit of uncertainty in the models just 36-48 hours out.

A short lived, low amplitude (weak) ridge will develop in the wake of the upper low by Sunday while a trough passes to our north in the Pacific Northwest. A broader, higher amplitude ridge will then setup off of the Pacific coastline by early next week, bringing further dry, mild late winter weather to the area. See previous discussion for more details on the current forecast package.

PREVIOUS DISCUSSION. as of 02:53 AM PST Thursday . A layer of stratus has built up over the Salinas Valley and Monterey Bay. High clouds pass over the Bay Area keeping temperatures in the 40s and even isolated areas in the low 50s. Temperatures around approximately two degrees warmer than at this time yesterday for most locations around the Bay Area and the Central Coast, though the potential for isolated valleys could be cooler. High clouds are expected to build on Thursday ahead of the next system moving toward the Pacific Coast.

An upper level low continues to grow west of California over the Pacific Ocean and dig southeastward. Models are depicting it kicking toward Southern California on Friday bringing chances of precipitations for the southern aspect of our region, from the Santa Cruz Mountains and East Bay Hills Southward, though best chances remain in southeastern Monterey County and at higher elevations. Accumulations are forecast to be maybe a tenth of an inch at most. As the low moves onshore, it'll switch the winds for the region to offshore and from the southwest. The low is forecast to retain its shape, yet have a looser pressure gradient, so winds may provide a few breezes, but remain relatively minimal.

However, that system will remain to the south and impact the Central Coast. The Bay Area will remain dry. Temperatures should reach the upper 60s and even the low 70s on Thursday and warm into the low to mid 70s on Friday thanks in part to the offshore flow. Winds should be light with high clouds present.

After that, the upper level ridge over the Pacific Ocean rebuilds bringing high pressure to dominate the region for the next week. A weak trough should pass over the Pacific Northwest midweek, but remain well north of the region. Both GFS and ECMWF models are trying to depict another trough transitioning into a cutoff low for next weekend into the beginning of March. Unfortunately, both models having upper level steering driving it south of the Bay Area. It appears for the time being that the Bay Area and the Central Coast will continue to see the same mild temperatures, but also dry conditions. And of course meaning that rain, let alone significant rainfall, will not be on the horizon.

AVIATION. as of 9:34 AM PST Thursday . For 18Z TAFs. VFR conditions are forecast to prevail through the period with passing high clouds. Winds are forecast to remain rather light today.

Vicinity of KSFO . VFR conditions expected with passing high clouds. Light winds this morning will eventually become west/northwest this afternoon around 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with increasing high clouds. Light offshore winds this morning will become onshore later today.

MARINE. as of 8:27 AM PST Thursday . Light northwesterly winds are forecast to prevail over the coastal waters today. A low pressure system will arrive on the Central Coast on Friday, bringing with it a chance of light rain to the waters south of Point Pinos. Dry weather returns Sunday and Monday. A moderate northwest swell persists through the week along with a light southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: DRP AVIATION: Sims MARINE: Sims

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi51 min 55°F 57°F1021.8 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi51 min 52°F 56°F1021.4 hPa
LNDC1 30 mi51 min 53°F 1021.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi69 min NNW 4.1 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi51 min 51°F 1021.4 hPa
OBXC1 33 mi51 min 52°F 49°F
PXSC1 34 mi51 min 52°F 49°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi51 min 51°F 1020.4 hPa
FTPC1 - 9414290 - San Francisco, CA 37 mi57 min 52°F 54°F1021.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi51 min 54°F 1021.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi46 min NNW 7 51°F 1021 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi51 min 50°F 54°F1021.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi57 min 51°F 1021.9 hPa
UPBC1 43 mi69 min ESE 6 G 8
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi57 min 53°F 54°F1021.8 hPa
46237 - San Francisco Bar, CA (142) 43 mi69 min 52°F2 ft
PCOC1 - 9415144 - Port Chicago, CA 44 mi51 min 49°F 53°F1021.4 hPa
ELXC1 - Elkhorn Slough Reserve, CA 44 mi84 min Calm 47°F 1019 hPa45°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi51 min 54°F 1021.2 hPa
46092 - MBM1 46 mi52 min E 12 48°F 53°F1021.1 hPa (+2.9)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi39 min E 3.9 G 5.8 52°F 53°F1021.5 hPa49°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi29 min N 1.9 G 3.9 51°F 55°F1021.4 hPa48°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA4 mi76 minS 310.00 miMostly Cloudy50°F37°F63%1021.3 hPa
Palo Alto Airport, CA8 mi82 minN 010.00 miPartly Cloudy50°F42°F76%1021.7 hPa
San Jose / Reid / Hillv, CA10 mi82 minN 010.00 miMostly Cloudy48°F37°F66%1021.7 hPa
San Carlos Airport, CA16 mi77 minN 010.00 miPartly Cloudy54°F46°F77%1021.7 hPa
Hayward, Hayward Air Terminal, CA18 mi75 minN 010.00 miFair52°F39°F64%1022.1 hPa
Livermore, Livermore Municipal Airport, CA21 mi76 minN 010.00 miFair47°F37°F69%1021.2 hPa
Oakland, Metro Oakland International Airport, CA23 mi76 minN 010.00 miMostly Cloudy55°F45°F69%1021.4 hPa
San Francisco, San Francisco International Airport, CA24 mi73 minN 09.00 miMostly Cloudy53°F46°F77%1021.2 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrNW3W5Calm3NW7N8NW7NW9NW5NW5NW3NW3CalmCalmE3S3E4S3SE5SE4CalmSE3S3Calm
1 day agoS3CalmNW54NW6NW8NW9NW10N8N7NW5N5S4CalmCalmS3SE3CalmSE3S3CalmCalmCalmCalm
2 days agoN6NW8NW9NW11NW16NW12NW10NW8N9NW5CalmCalm3CalmS3S3SW4CalmCalmSE3CalmS4CalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Thu -- 05:18 AM PST     Moonrise
Thu -- 05:28 AM PST     2.99 feet Low Tide
Thu -- 06:51 AM PST     Sunrise
Thu -- 10:08 AM PST     10.15 feet High Tide
Thu -- 03:12 PM PST     Moonset
Thu -- 05:52 PM PST     Sunset
Thu -- 06:20 PM PST     -0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.17.36.14.83.73.13.24.66.8910.19.98.97.35.23.11.40.2-0.4-0.21.13.15.47.4

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Thu -- 03:27 AM PST     -0.61 knots Max Ebb
Thu -- 05:03 AM PST     0.00 knots Slack
Thu -- 05:19 AM PST     Moonrise
Thu -- 06:51 AM PST     Sunrise
Thu -- 07:41 AM PST     1.05 knots Max Flood
Thu -- 10:22 AM PST     -0.00 knots Slack
Thu -- 03:13 PM PST     Moonset
Thu -- 03:15 PM PST     -1.36 knots Max Ebb
Thu -- 05:52 PM PST     Sunset
Thu -- 05:55 PM PST     0.00 knots Slack
Thu -- 08:51 PM PST     1.52 knots Max Flood
Thu -- 11:56 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.4-0.6-0.6-0.6-00.6110.80.3-0.3-0.7-1.1-1.3-1.4-1.3-0.80.10.91.41.51.30.7

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 (13,3,4,5)
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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.