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Marine Weather and Tides Sunnyvale, CA Version 3.4

NOTICE 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 5:59AM

Sunset 8:28PM

Thursday July 18, 2019 2:05 AM PDT (09:05 UTC)

Moonrise 8:57PM

Moonset 6:34AM

Illumination 98%

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.

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7 Day Forecast for Marine Location Near Sunnyvale, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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Fxus66 kmtr 180525 afdmtr area forecast discussion national weather service san francisco bay area 1025 pm pdt Wed jul 17 2019 Synopsis A gradual cooling trend will continue through late week with periods of night and morning low clouds. Temperatures will begin to warm slightly this weekend and rebound back to near seasonal averages by next week. Discussion As of 09:00 pm pdt Wednesday... Interesting evolution in today's weather under sunny skies. Temperatures were forecast to moderate or drop a few degrees under a somewhat flat flow aloft. Upon closer inspection the cooldown did occur across the coast and inland valleys - both santa cruz and santa rosa were much cool today. The interesting part is above the seabreeze with a slight northerly flow over the hills leading to much warmer weather. In other words, all about micro-climates today with some warmer and some colder. The last few images of the visible satellite show the marine layer makes its nightly return with some low clouds already pushing into the salinas valley. The marine layer will likely fill in pretty solid overnight. The latest 00z models even show a few hundredths of precip, which is usually a sign of patchy drizzle. Latest forecast remains on track for the near term and see no reason to update the forecast. Night and morning clouds will continue over the next few days with onshore flow. The resulting sensible weather will be continued cooling through at least Saturday. A slight uptick in temperatures are expected on Sunday with slight warming aloft and high pressure to the east. Next week is beginning to look a little different than what it did a few days ago. A ridge is still forecast to build over the four corners region and nudge westward early next week. The westward nudging looks to now be hampered by a trough deepening off the west coast. The forecast will still show a warming trend next week, but it will be a battle between the ridge to the east and the trough to the west for how warm it actually gets. Stay tuned...

Aviation As of 10:25 pm pdt Wednesday... Vlifr-ifr is proceeding to cover the immediate coastline due to low stratus ceilings and fog. Vlifr-ifr is likely to extend through the golden gate to the east bay as well as extending into the salinas valley otherwise vfr is quite likely to continue most inland locations for tonight and Thursday. Winds are overall much weaker since the synoptic pattern over norcal has changed since yesterday. Boundary layer winds on the WRF model and on the NAM 925 mb and 850 mb wind fields indicate a weak cyclonic circulation will drift southwestward to the coastal waters west of the north bay Thursday setting up a more robust onshore flow for Thursday, this should boost seabreezes everywhere more than seen today; 06z TAF wind speed forecasts generally above statistical guidance. Vicinity of ksfo...VFR continues tonight into Thursday. West wind gusts near 25 knots or slightly higher resume Thursday afternoon and evening. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Vlifr-ifr due to low stratus ceilings and fog tonight and Thursday morning. Clearing toVFR likely by late Thursday morning, onshore winds more robust Thursday afternoon and early evening than today. Marine As of 10:07 pm pdt Wednesday... Wind flow in the near term is from the south from the monterey bay southward along the big sur coast and variable to northwest over the remainder of the coastal waters. Gusty west winds developing over the san francisco bay to the delta Thursday afternoon and evening. Light long period southerly swell will continue into Thursday. Mtr watches warnings advisories Tngt Sca... Pt arena to pigeon pt 10-60 nm sca... Pt arena to pt reyes 0-10 nm sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am public forecast: mm aviation marine: canepa visit us at

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
RTYC1 - 9414523 - Redwood City, CA	14 mi	66 min	NE 1 G 1.9	64°F	74°F		1013.5 hPa (-0.0)
AAMC1 - 9414750 - Alameda, CA	30 mi	72 min	W 8.9 G 12	60°F	69°F		1013.6 hPa
LNDC1	30 mi	66 min	W 6 G 9.9	60°F			1013.2 hPa (+0.4)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	72 min	WSW 11 G 12
OBXC1	33 mi	66 min		60°F				59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	66 min	W 4.1 G 7	60°F			1013.2 hPa (+0.4)
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	66 min	W 7 G 9.9	58°F			1012.1 hPa (+0.3)
FTPC1 - 9414290 - San Francisco, CA	37 mi	72 min	SW 8 G 14	58°F	57°F		1013.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	66 min	SSW 13 G 19	59°F			1013 hPa (+0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA	41 mi	49 min	S 12	58°F			1013 hPa
RCMC1 - 9414863 - Richmond, CA	42 mi	66 min			64°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	72 min	NW 9.9 G 14	72°F			1010.3 hPa
UPBC1	43 mi	66 min	WNW 8 G 13
46237 - San Francisco Bar, CA (142)	43 mi	66 min			55°F	5 ft
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	72 min	WNW 12 G 14	64°F	70°F		1011.6 hPa
PCOC1 - 9415144 - Port Chicago, CA	44 mi	66 min	W 17 G 18	64°F	70°F		1011.5 hPa (+0.4)
MLSC1 - Moss Landing, South Harbor, CA	44 mi	42 min	WSW 8 G 20	55°F			1015.5 hPa	55°F
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	81 min	W 2.9	55°F			1015 hPa	55°F
46092 - MBM1	46 mi	53 min	S 5.8	54°F	55°F		1015 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	66 min	WSW 13 G 17	61°F			1011.7 hPa (+0.7)
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	76 min	E 3.9 G 5.8	55°F	57°F	5 ft	1014.1 hPa (+0.0)

Wind History for Redwood City, CA

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
San Jose, San Jose International Airport, CA	4 mi	73 min	SSE 7	10.00 mi	Fair	64°F	55°F	73%	1012.8 hPa
Mountain View, Moffett Field, CA	4 mi	70 min	N 3	10.00 mi	Fair	65°F	57°F	76%	1013.3 hPa
San Jose / Reid / Hillv, CA	10 mi	4.1 hrs	Var 6	10.00 mi	Clear	73°F	53°F	50%	1012.9 hPa
Hayward, Hayward Air Terminal, CA	18 mi	72 min	NNW 5	10.00 mi	Fair	61°F	55°F	81%	1013.7 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	73 min	N 0	10.00 mi	Fair	66°F	54°F	65%	1011.6 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	73 min	NNW 5	10.00 mi	A Few Clouds	62°F	55°F	78%	1013.2 hPa
San Francisco, San Francisco International Airport, CA	24 mi	70 min	WNW 8	10.00 mi	A Few Clouds	62°F	53°F	73%	1012.8 hPa

Wind History from SJC (wind in knots)

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Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California

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Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current

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Weather Map and Satellite Images

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GOES 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

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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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Disclaimer: 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 numerious 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.