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Marine Weather and Tides Sunnyvale, CA Version 3.4

NOTICE 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. 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 7:20AM

Sunset 6:24PM

Monday October 21, 2019 12:57 AM PDT (07:57 UTC)

Moonrise 11:49PM

Moonset 1:40PM

Illumination 48%

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 210537 afdmtr area forecast discussion national weather service san francisco bay area 1037 pm pdt Sun oct 20 2019 Synopsis A warming and drying trend will continue through much of the week ahead as high pressure strengthens over california. In addition, offshore flow will develop by Monday, and increase by midweek, which will result in warm temperatures reaching all the way to the coast. Locally gusty offshore winds are likely at times in the hills, especially in the north bay hills on Wednesday night and Thursday morning. In the longer range, cooling is forecast next weekend, although another round of dry offshore winds look increasingly likely by late in the weekend and into early next week. Discussion As of 9:00 pm pdt Sunday... Sunday was a mostly sunny and mild autumn day with light winds and temperatures near normal. Afternoon highs were a few degrees warmer than Saturday in most locations and as much as 15 degrees warmer in the north bay. The warming trend that got off to a tentative start in most areas today will become more robust and widespread on Monday as offshore flow develops. Offshore flow will be most evident in the hills where widespread north winds will bring a drier airmass into the region. In addition, an upper ridge currently centered offshore along 135w will shift eastward and be aligned along the ca coast by late Monday. Subsidence under this ridge is forecast to increase 850 mb temperatures from about 13 deg c today to 18 deg c by tomorrow afternoon. Afternoon highs on Monday are forecast to warm into the 70s near the coast and 80s inland. A few additional degrees of warming is likely on Tuesday as the airmass dries out even further. Although daytime temperatures will be trending upward, nighttime temperatures will not likely change much, and could actually cool a bit in the valleys by Tuesday morning due to the dry nature of the airmass. The daytime warming trend will likely stall temporarily on Wednesday when the upper ridge weakens slightly over california in response to an upper trough dropping southeast out of western canada and across the northern rockies. The upper ridge will then quickly rebuild near the ca coast by Thursday. Also, surface high pressure is forecast to strengthen over the great basin on Wednesday night which will enhance offshore flow across our area Wednesday night into Thursday. These developments will result in renewed warming on Thursday, especially in coastal areas which will be impacted most by stronger offshore flow. Offshore flow is then expected to decrease by Friday as the surface high over the great basin weakens. Thus, Thursday will likely be the warmest day of the week at the coast. In any case, warm temperatures will persist in all areas into Friday and the interior valleys and hills may see their warmest temps on Friday. Given the warm and very dry conditions expected through the week ahead, fire weather concerns will be elevated, especially if offshore winds increase sufficiently. Locally gusty offshore winds are likely at times, particularly across the north bay on Wednesday night and Thursday morning when offshore gradients are forecast to peak. Winds in the hills are not expected to be strong enough to warrant wind advisories, but offshore winds will likely be strong enough to create critical fire weather conditions, especially on Wednesday night and early Thursday (see fire weather discussion below for details). Longer range models agree that an upper trough will plunge south out of western canada next weekend. This trough is forecast to dig

south much farther to the west than the midweek system, and bring much cooler temperatures to our region by the end of next weekend. Also, widespread gusty offshore winds will likely accompany this system late in the weekend and into early next week. So, even through temperatures will be on a steep decline, dry gusty winds will likely result in renewed fire concerns. Aviation As of 10:40 pm pdt Sunday... Developing offshore flow over the area will keepVFR conditions over the sfo bay area. Models suggest some increasing low level moisture over the coastal waters later tonight with patchy CIGS developing along the coast and around mry bay area. Satellite image does show low clouds approaching mry bay so will have to watch if the stratus continues towards land or veers offshore. Vicinity of ksfo...VFR. Sfo bridge approach... Same as ksfo. Monterey bay terminals... Ifr CIGS expected after 10z but confidence is not high as it could stay clear. Fire weather As of 9:00 pm pdt Sunday... Heightened fire weather concerns are expected through the week as warm and very dry conditions combine with gusty offshore winds at times to create critical to near critical fire weather conditions. Latest local WRF model forecasts locally gusty north winds in the higher hills of southern san benito county and southeast monterey county late tonight and Monday morning. These winds will be of relatively short duration and occur before the driest airmass arrives. A warming and drying trend will continue through Thursday as high pressure builds over california and offshore flow develops. Offshore flow will be mostly light except locally moderate and gusty at times in the hills. Relative humidity values will drop into the teens by Tuesday afternoon. Very poor overnight humidity recoveries are expected in the hills starting Monday night and continuing for the rest of the week. The period of greatest concern is Wednesday night and Thursday morning when some models indicate the potential for stronger north to northeast winds in the hills, mainly across the higher elevations of the north bay. Fire weather watches and or red flag warnings may be issued over the next few days if critical fire weather conditions are deemed likely to occur. Marine As of 10:23 pm pdt Sunday... A 1027 mb high centered 1000 miles west of point pinos will move east resulting in increasing northwest winds over the coastal waters tonight through Wednesday. Winds will decrease by Wednesday night as winds turn more offshore. A moderate northwest swell will continue. Mtr watches warnings advisories Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 11 pm sca... Pt arena to pt reyes 0-10 nm sca... Pt arena to pigeon pt 10-60 nm sca... Pt reyes to pigeon pt 0-10 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pigeon pt to pt piedras blancas 10-60 nm public forecast: dykema aviation: W pi marine: W pi fire weather: dykema 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	58 min	Calm G 1	59°F	65°F		1021.3 hPa (+0.9)
AAMC1 - 9414750 - Alameda, CA	30 mi	64 min	E 1 G 1	59°F	62°F		1020.8 hPa
LNDC1	30 mi	58 min	SE 2.9 G 4.1	60°F			1020.2 hPa (+0.8)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	58 min	SE 2.9 G 2.9
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	58 min	E 1.9 G 1.9	59°F			1020.3 hPa (+0.9)
OBXC1	33 mi	58 min		60°F				57°F
PXSC1	34 mi	58 min		60°F				56°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	58 min	ESE 2.9 G 4.1	59°F			1019.2 hPa (+0.6)
FTPC1 - 9414290 - San Francisco, CA	37 mi	64 min	S 4.1 G 4.1	56°F	56°F		1020.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	58 min	SSE 1 G 1	61°F			1020.6 hPa (+0.8)
TIBC1 - Tiburon Pier, San Francisco Bay, CA	41 mi	53 min	SW 1.9	58°F			1020 hPa
RCMC1 - 9414863 - Richmond, CA	42 mi	58 min			61°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	58 min	WNW 8.9 G 11	65°F			1019.2 hPa (+0.8)
UPBC1	43 mi	58 min	WNW 7 G 8.9
46237 - San Francisco Bar, CA (142)	43 mi	58 min			55°F	5 ft
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	58 min	WNW 5.1 G 6	62°F	63°F		1020 hPa (+0.9)	61°F
PCOC1 - 9415144 - Port Chicago, CA	44 mi	58 min	SSW 4.1 G 8	60°F	64°F		1020.1 hPa (+0.9)
MLSC1 - Moss Landing, South Harbor, CA	44 mi	114 min	E 2.9 G 8	55°F			1020.1 hPa	50°F
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	73 min	ESE 2.9	54°F			1018 hPa	50°F
46092 - MBM1	46 mi	47 min	NNW 7.8	56°F	55°F		1019.5 hPa (+1.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	58 min	S 2.9 G 4.1	60°F			1019.8 hPa (+0.9)
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	68 min	21 G 27	57°F	58°F	9 ft	1019.3 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	65 min	NNW 3	10.00 mi	Fair	58°F	53°F	84%	1020.6 hPa
Palo Alto Airport, CA	8 mi	4.2 hrs	N 0	10.00 mi	Clear	57°F	48°F	72%	1020 hPa
San Jose / Reid / Hillv, CA	10 mi	3.1 hrs	N 0	10.00 mi	Clear	61°F	50°F	68%	1020.3 hPa
San Carlos Airport, CA	16 mi	4 hrs	N 0	10.00 mi	Clear	63°F	48°F	60%	1020 hPa
Hayward, Hayward Air Terminal, CA	18 mi	64 min	E 3	10.00 mi	Fair	57°F	50°F	78%	1021.3 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	65 min	N 0	10.00 mi	Fair	55°F	43°F	64%	1020 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	65 min	N 0	10.00 mi	Fair	57°F	51°F	81%	1020.6 hPa
San Francisco, San Francisco International Airport, CA	24 mi	2 hrs	W 12	10.00 mi	Fair	58°F	51°F	78%	1020.2 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

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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

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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.