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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 7:11AM

Sunset 4:51PM

Friday December 13, 2019 4:49 PM PST (00:49 UTC)

Moonrise 6:29PM

Moonset 8:38AM

Illumination 95%

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 132341 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 341 PM PST Fri Dec 13 2019

SYNOPSIS. Chances of light rain will continue tonight and into this weekend as a disturbance moves across Northern California. Drier and colder conditions will prevail on Sunday, with frost possible Sunday night. An unsettled possibly wet pattern will likely to return by the middle of next week.

DISCUSSION. As of 1:43 PM PST Friday . Under cloudy skies, area temperatures are running cooler than yesterday at this time by several degrees, with readings ranging from the mid 50s to the lower 60s. Only light returns are being picked up by radar right now, but some brief showers moved through the Bay Area earlier today. Over the past three hours, only a few hundredths of an inch have been picked up. Areas of light rain or drizzle will occur overnight, and taper off by morning. Rainfall amounts are expected to be a quarter inch or less, with the bulk of that occurring in the coastal hills of the North Bay. A cold front will then move across the region late in the day on Saturday. Although this cold front will bring some light rain to the region, the biggest impact will be with the colder and drier air moving in behind the front. Although Sunday will be slightly cooler than Saturday, the main impact will be on the overnight temperatures Sunday night with frosty conditions will be possible as temperatures fall into the lower to mid 30s across the inland valleys.

Drier conditions are expected for early next week as high pressure builds along the coast. Although there are still inconsistencies amongst the model solutions, medium range models still indicate a return to a more unsettled pattern beginning the middle of next week with more well-defined storm systems moving through.

AVIATION. as of 03:41 PM PST Friday . For 00z tafs. Most sites currently VFR with FEW to SCT lower cigs between 1,000 and 3,000 ft AGL ahead of a weak trough and cold front that remain just offshore. Current radar shows light showers over the North Bay that will move southward this evening across the rest of the region. Still expecting cigs to lower this evening to MVFR/IFR with showers in the vicinity until late tonight/tomorrow morning as showers taper off from north to south. Patchy fog will also be possible tonight across the North Bay once showers clear out. Overall, expecting MVFR to LIFR conditions to prevail overnight and tomorrow morning before cigs gradually lift and then briefly clear towards the afternoon. Another weak disturbance is then set to move in late tomorrow afternoon/early evening bringing more light showers and lowering cigs.

Winds this afternoon mainly out of the S/SE ahead of a weak trough and cold front, these winds may occasionally exceed 10 kt in some locations. Expecting winds to shift out of the W/SW by the evening.

Vicinity of KSFO . Cigs have lifted to VFR this afternoon, but expecting MVFR conditions to return this evening and continue to lower overnight. Some uncertainty as to when cigs will start to lower this evening and then lift tomorrow morning. Winds have been inconsistent this afternoon with a period of SE winds around 10 kt just a short while ago where now observations show N/NE winds less than 5 kt. S/SE winds around 10 kt will remain possible over the next couple of hours ahead of a weak trough and cold front before winds shift out of the W/SW heading into the evening. W/NW winds will increase overnight and tomorrow morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions currently with showers in the vicinity. Expect cigs to lower by this evening with IFR conditions prevailing overnight and tomorrow morning. Cigs will lift late tomorrow morning and into the afternoon. Light showers will remain possible overnight. Generally light winds expected through tonight with increasing W/NW winds late tomorrow morning.

MARINE. as of 02:56 PM PST Friday . A weak trough and cold front will drift through the coastal waters tonight. Southerly winds will switch to southwesterly this evening and then northwest overnight tonight through Saturday. Rain will fall across the waters today with showers lingering through Saturday. Winds are expected to increase and become breezy on Saturday. A large long- period northwest swell will impact the waters through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. High Surf Advisory . CAZ006-505-509-529-530 SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Mry Bay



PUBLIC FORECAST: Sims AVIATION: AS MARINE: ST

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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	49 min	N 2.9 G 5.1	60°F	58°F		1020.2 hPa (-2.3)
AAMC1 - 9414750 - Alameda, CA	30 mi	49 min			56°F
LNDC1	30 mi	49 min	SE 1.9 G 1.9	58°F			1019.5 hPa (-2.0)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	49 min	SSE 1 G 1.9
OBXC1	33 mi	49 min		56°F				56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	49 min	SSE 1 G 1.9	56°F			1019.6 hPa (-1.9)
PXSC1	34 mi	49 min		57°F				57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	49 min	Calm G 1.9	56°F			1018.7 hPa (-1.5)
FTPC1 - 9414290 - San Francisco, CA	37 mi	55 min	S 2.9 G 5.1	56°F	55°F		1019.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	49 min	S 5.1 G 6	57°F			1019.8 hPa (-1.5)
RCMC1 - 9414863 - Richmond, CA	42 mi	49 min			55°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	49 min	SW 1.9 G 1.9	58°F			1019.6 hPa (-1.3)
UPBC1	43 mi	49 min	WSW 5.1 G 12
46237 - San Francisco Bar, CA (142)	43 mi	49 min			55°F	12 ft
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	49 min	SSW 6 G 8	57°F	55°F		1019.5 hPa (-1.3)
PCOC1 - 9415144 - Port Chicago, CA	44 mi	49 min	SW 5.1 G 7	58°F	54°F		1019.2 hPa (-1.3)
MLSC1 - Moss Landing, South Harbor, CA	44 mi	30 min	NNE 1.9 G 7	57°F			1020.7 hPa	56°F
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	64 min	Calm	58°F			1022 hPa	57°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	49 min	SSW 6 G 8	58°F			1019 hPa (-1.5)
46092 - MBM1	46 mi	32 min	SE 7.8	56°F	58°F		1019.8 hPa (-2.3)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	48 mi	29 min	S 7.8 G 12	56°F	57°F		1020.3 hPa	55°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	29 min	SSE 7.8 G 12	56°F	57°F		1020 hPa	56°F

Wind History for Redwood City, CA

(wind in knots)    EDIT      (on/off)   Help

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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	56 min	SE 10	10.00 mi	Overcast	62°F	46°F	58%	1019.3 hPa
Palo Alto Airport, CA	8 mi	62 min	N 0	10.00 mi	Overcast	61°F	53°F	77%	1020 hPa
San Jose / Reid / Hillv, CA	10 mi	62 min	SE 8	10.00 mi	Overcast	63°F	44°F	52%	1020 hPa
San Carlos Airport, CA	16 mi	2 hrs	ESE 6	10.00 mi	Mostly Cloudy	59°F	55°F	88%	1020.3 hPa
Hayward, Hayward Air Terminal, CA	18 mi	55 min	NNW 3	10.00 mi	Overcast	60°F	50°F	70%	1021.1 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	56 min	NNW 5	10.00 mi	Overcast	60°F	48°F	65%	1019.8 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	56 min	NNW 4	10.00 mi	Overcast	59°F	52°F	78%	1020.4 hPa
San Francisco, San Francisco International Airport, CA	24 mi	53 min	N 5	10.00 mi	Overcast	58°F	53°F	84%	1019.9 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 (19,4,5,8)

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Ground Weather Radar Station San Francisco Bay Area, CA

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