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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.

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Sunrise 6:49AM

Sunset 5:53PM

Thursday February 20, 2020 10:09 AM PST (18:09 UTC)

Moonrise 5:19AM

Moonset 3:13PM

Illumination 9%

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 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 Temp	Water Temp	Waves	Pressure	DewPt
RTYC1 - 9414523 - Redwood City, CA	14 mi	51 min		55°F	57°F		1021.8 hPa
AAMC1 - 9414750 - Alameda, CA	30 mi	51 min		52°F	56°F		1021.4 hPa
LNDC1	30 mi	51 min		53°F			1021.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	69 min	NNW 4.1 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	51 min		51°F			1021.4 hPa
OBXC1	33 mi	51 min		52°F				49°F
PXSC1	34 mi	51 min		52°F				49°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	51 min		51°F			1020.4 hPa
FTPC1 - 9414290 - San Francisco, CA	37 mi	57 min		52°F	54°F		1021.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	51 min		54°F			1021.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA	41 mi	46 min	NNW 7	51°F			1021 hPa
RCMC1 - 9414863 - Richmond, CA	42 mi	51 min		50°F	54°F		1021.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	57 min		51°F			1021.9 hPa
UPBC1	43 mi	69 min	ESE 6 G 8
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	57 min		53°F	54°F		1021.8 hPa
46237 - San Francisco Bar, CA (142)	43 mi	69 min			52°F	2 ft
PCOC1 - 9415144 - Port Chicago, CA	44 mi	51 min		49°F	53°F		1021.4 hPa
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	84 min	Calm	47°F			1019 hPa	45°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	51 min		54°F			1021.2 hPa
46092 - MBM1	46 mi	52 min	E 12	48°F	53°F		1021.1 hPa (+2.9)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	48 mi	39 min	E 3.9 G 5.8	52°F	53°F		1021.5 hPa	49°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	29 min	N 1.9 G 3.9	51°F	55°F		1021.4 hPa	48°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	76 min	S 3	10.00 mi	Mostly Cloudy	50°F	37°F	63%	1021.3 hPa
Palo Alto Airport, CA	8 mi	82 min	N 0	10.00 mi	Partly Cloudy	50°F	42°F	76%	1021.7 hPa
San Jose / Reid / Hillv, CA	10 mi	82 min	N 0	10.00 mi	Mostly Cloudy	48°F	37°F	66%	1021.7 hPa
San Carlos Airport, CA	16 mi	77 min	N 0	10.00 mi	Partly Cloudy	54°F	46°F	77%	1021.7 hPa
Hayward, Hayward Air Terminal, CA	18 mi	75 min	N 0	10.00 mi	Fair	52°F	39°F	64%	1022.1 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	76 min	N 0	10.00 mi	Fair	47°F	37°F	69%	1021.2 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	76 min	N 0	10.00 mi	Mostly Cloudy	55°F	45°F	69%	1021.4 hPa
San Francisco, San Francisco International Airport, CA	24 mi	73 min	N 0	9.00 mi	Mostly Cloudy	53°F	46°F	77%	1021.2 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 (13,3,4,5)

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Ground Weather Radar Station San Francisco Bay Area, CA

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