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Marine Weather and Tides Sunnyvale, CA Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 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 6:25AM

Sunset 7:57PM

Sunday August 18, 2019 12:25 AM PDT (07:25 UTC)

Moonrise 8:57PM

Moonset 8:13AM

Illumination 93%

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 180543 afdmtr area forecast discussion national weather service san francisco bay area 1043 pm pdt Sat aug 17 2019 Synopsis The cooling trend will continue into Sunday, with a few additional degrees of cooling expected, especially inland. Dry and seasonable temperatures are expected Monday and Tuesday before the next warming trend begins midweek. Discussion As of 9:00 pm pdt Saturday... The cooling trend that got underway yesterday expanded farther inland today as the marine layer depth increased to more than 2000 feet. Some inland areas were more than 20 degrees cooler today compared to Friday. More than 25 degrees of cooling has occurred since Thursday in some locations. For example: kentfield's high of 100 on Thursday was 26 degrees warmer than today's high of 74. Data from the fort ord profiler indicates that the marine layer depth has increased to about 3000 feet this evening and latest satellite shows that all of santa cruz county is currently blanketed with low clouds. Given the depth of the marine layer and the moderate onshore flow in place, expect widespread low clouds across our forecast area by Sunday morning. Will also likely see patchy drizzle overnight and into Sunday morning, especially in locations that experience upslope conditions in southwesterly flow like santa cruz county. Both watsonville and corralitos picked up measurable precipitation this morning (0.01") and it's possible this may occur once again on Sunday morning as light southerly low level flow persists. Most inland areas will clear by afternoon on Sunday, but some coastal areas will probably experience all day gray. The upper trough responsible for our current cool-down will continue to deepen over california through tomorrow, cooling the airmass aloft over our area. This airmass cooling, combined with the deep marine layer, will result in a continued downward trend in high temperatures on Sunday, especially in the hills and in the inland valleys where highs are forecast to decrease by another 5 degrees or more. Little additional cooling is expected in coastal areas. Temperatures are forecast to drift slightly higher on Monday and Tuesday as an upper ridge over the southern plains builds westward and heights begin to rise over california. But for the most part,

temperatures are expected to remain at least slightly cooler than seasonal averages through Tuesday. More robust warming is forecast to occur around midweek, but a trough approaching from the west is expected to dampen the strengthening upper ridge and keep most inland valley locations from warming past the lower 90s during the second half of next week. The upshot is that the upcoming midweek warmup is not expected to result in temperatures anywhere near as warm as what occurred this past Wednesday Thursday. In the longer range, both the GFS and ECMWF ensemble means indicate the potential for a more significant warmup next weekend when an upper ridge is forecast to build off the northern california coast. This particular location of upper ridge development is often correlated with offshore surface flow which would mean warming would occur in all areas, including the coast. Aviation As of 10:41 pm pdt Saturday... Despite a deep marine layer... Strong southerly flow is resulting in subsidence that is keeping clouds out of the sfo bay area thus far. This is supported by the southerly winds currently being reported at sfo and sjc. Models keep southerly flow going through the night. Latest forecast has only a tempo MVFR cig for sfo and the approach between 12z and 16z and even that is low confidence as it could stayVFR through Sunday. Vicinity of ksfo...VFR expected. Possible tempo MVFR CIGS between 12z and 16z with bases around 1500 ft. South-southwest winds 10 kt becoming more southwest Sunday afternoon. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... High-based stratus with bases 1500 feet. Becoming sct at sns after 19z and mry after 20z. Marine As of 10:29 pm pdt Saturday... High pressure off the california coast will weaken on Sunday as a low pressure system develops off british columbia. This will result in decreasing winds Sunday through the middle of next week. Mtr watches warnings advisories Tngt Sca... Pt arena to pigeon pt 10-60 nm sca... Sf bay until 11 pm public forecast: dykema aviation: W pi marine: W pi 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	56 min	S 4.1 G 7	62°F	77°F		1010.3 hPa
AAMC1 - 9414750 - Alameda, CA	30 mi	62 min	W 2.9 G 4.1	63°F	71°F		1010.1 hPa
LNDC1	30 mi	56 min	W 4.1 G 6	63°F			1009.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	62 min	WSW 8 G 8
OBXC1	33 mi	56 min		62°F				58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	56 min	WSW 4.1 G 6	62°F			1009.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	56 min	S 2.9 G 5.1	61°F			1008.7 hPa
FTPC1 - 9414290 - San Francisco, CA	37 mi	62 min	SW 9.9 G 14	60°F	61°F		1010 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	56 min	SW 17 G 21	62°F			1009.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA	41 mi	45 min	W 8	60°F			1010 hPa
RCMC1 - 9414863 - Richmond, CA	42 mi	56 min			65°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	56 min	WNW 15 G 20	64°F			1007.4 hPa
UPBC1	43 mi	56 min	W 9.9 G 14
46237 - San Francisco Bar, CA (142)	43 mi	56 min			60°F	4 ft
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	62 min	WSW 7 G 12	62°F	72°F		1009.1 hPa
PCOC1 - 9415144 - Port Chicago, CA	44 mi	56 min	WSW 12 G 17	62°F	73°F		1008.8 hPa
MLSC1 - Moss Landing, South Harbor, CA	44 mi	47 min	SW 5.1 G 13	61°F			1011.9 hPa	56°F
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	101 min	SW 4.1	61°F			1010 hPa	57°F
46092 - MBM1	46 mi	76 min	SW 5.8	61°F	60°F		1011.3 hPa (+0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	56 min	WSW 17 G 22	62°F			1008.7 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	36 min	NW 5.8 G 5.8	62°F	62°F	6 ft	1010.8 hPa (+0.4)

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	93 min	SE 8	10.00 mi	Fair	62°F	60°F	93%	1009.9 hPa
Mountain View, Moffett Field, CA	4 mi	90 min	SE 9	10.00 mi	Fair	63°F	54°F	73%	1010 hPa
Palo Alto Airport, CA	8 mi	3.6 hrs	WSW 6	10.00 mi	Clear	64°F	55°F	73%	1009.1 hPa
San Jose / Reid / Hillv, CA	10 mi	2.6 hrs	SSE 9	10.00 mi	Clear	63°F	53°F	73%	1009.8 hPa
San Carlos Airport, CA	16 mi	3.5 hrs	WSW 4	10.00 mi	Clear	64°F	53°F	68%	1009.5 hPa
Hayward, Hayward Air Terminal, CA	18 mi	92 min	SSE 3	10.00 mi	Fair	64°F	55°F	73%	1010.4 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	93 min	NW 7	10.00 mi	Fair	61°F	54°F	78%	1008.9 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	93 min	SW 13	10.00 mi	A Few Clouds	65°F	55°F	73%	1009.6 hPa
San Francisco, San Francisco International Airport, CA	24 mi	90 min	SSW 9	10.00 mi	Fair	63°F	53°F	70%	1009.6 hPa

Link to 5 minute data for KSJC

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 (3,6,7,8)

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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.