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Marine Weather and Tides Castro Valley, 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 6:19AM

Sunset 8:08PM

Monday August 10, 2020 12:16 PM PDT (19:16 UTC)

Moonrise 11:00PM

Moonset 11:55AM

Illumination 57%

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 Castro Valley, CA

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

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FXUS66 KMTR 101733 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1033 AM PDT Mon Aug 10 2020

SYNOPSIS. A slight cooling trend is forecast to occur today and Tuesday, especially across the interior. Meanwhile, little change is anticipated near the coast with the typical ebb and flow of low clouds each night/morning. Warming is likely late in the week and into next weekend.

DISCUSSION. as of 08:26 AM PDT Monday . A very 'summer-like' satellite image is visible this morning with widespread clouds over the coastal waters and over the inland valleys. Profilers put the depth at around 1,000 feet with some patchy fog being reported for Monterey/Salinas. Above the marine layer temperatures remain mild, but fortunately from a fire weather standpoint humidity levels are in the moderate range with a few locally poor.

No update needed this morning. Once the clouds roll back to the coast temperatures will warm up, but be slightly cooler than Sunday. Nonetheless it should still be a pleasant August afternoon.

Weather concerns for the upcoming week will be upper level tropical moisture late in the work week and possible instability and extent of warm up next weekend.

PREV DISCUSSION. As of 2:30 AM PDT Monday . A broad upper ridge, extending from the Eastern Pacific eastward across the southern CONUS continues to compress the marine layer and generate seasonably warm temperatures across the interior. Meanwhile, persistent light southerly low level flow has kept marine layer stratus banked up against our coast, and thus kept daytime temperatures in most areas near the ocean in the 60s and lower 70s.

An upper trough, currently over the Gulf of Alaska, is forecast to shift southeast and over the Pac NW during the next few days, which will result in slight weakening of the upper ridge over California and thus a deepening of the marine layer. In addition, the latest local WRF forecasts increased low level onshore flow by late today, and continuing through Tuesday. These developments will result in cooling across inland areas over the next two days, with high temperatures forecast to cool about 3 to 5 degrees each day. Coastal areas likely won't experience much change and will continue to see widespread night and morning low clouds with only partial afternoon clearing.

During the second half of the week, and into the upcoming weekend, models generally agree that an upper ridge centered over the Desert Southwest will expand westward and across Central and Southern California, generating warming primarily for our inland areas. However, the magnitude of warming during the extended forecast period is somewhat uncertain since the ECMWF builds the ridge more strongly over California compared to the GFS, and thus produces more robust warming. The middle ground between these two models, where the NBM forecast temperatures generally reside, is probably the best forecast option.

Tropical Storm Elida, off the west coast of Mexico, is forecast to become a hurricane later today. Some of the moisture from this tropical system is forecast to be drawn northward around the western periphery of the Desert Southwest High, and eventually make its way across southern and central California by late in the week. Models do not currently generate precipitation over California as this moisture arrives, and the most we can expect to see are some mid and high level clouds across the southern part of our forecast area. But we will need to watch for any potential mid-level instability which could trigger isolated high-based convection and dry lightning.

AVIATION. as of 10:30 AM PDT Monday . for 18Z TAFs. VRF conditions have returned to the terminals as of 1730Z in response to dissipating stratus. Look for VFR conditions to prevail through the afternoon with a typical increase in onshore winds. Low clouds likely to return inland slightly earlier this evening for terminals closer to the coast while surface wind speeds also diminish. A deeper marine layer will also likely bring lowering ceilings to inland terminals by early Tuesday morning.

Vicinity of KSFO . VFR. W/NW winds will increase to around 12-15 KT around 20Z and persist through the early evening before diminishing slightly. MVFR/IFR ceilings likely to develop beyond 10Z Tuesday and persist through about 18Z Tuesday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. An increase in NW winds to 9-12 KT is likely later this morning and will continue through the afternoon with low clouds lingering near the coast. An early return of stratus and diminishing winds is likely around 03Z with IFR to LIFR ceilings persisting through Tuesday morning.

MARINE. as of 10:30 AM PDT Monday . A weak upper level low pressure system just west of San Francisco and surface high pressure to the north of this feature will bring light southerly winds through Tuesday. Winds will switch to the west to northwest Tuesday night through Friday but will remain generally light. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 11 AM



PUBLIC FORECAST: MM/Dykema AVIATION: RGass MARINE: RGass

Visit us at www.weather.gov/sanfrancisco

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
LNDC1	13 mi	46 min	NW 5.1 G 8	63°F			1013.9 hPa
AAMC1 - 9414750 - Alameda, CA	13 mi	46 min	W 6 G 8	62°F	70°F		1014.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	15 mi	46 min	WNW 8 G 9.9
RTYC1 - 9414523 - Redwood City, CA	16 mi	46 min	N 7 G 8.9	65°F	74°F		1014.1 hPa
OBXC1	16 mi	46 min		60°F				59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	16 mi	46 min	NW 8.9 G 9.9	59°F			1014.1 hPa
PXSC1	18 mi	46 min		61°F				60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	18 mi	46 min	W 8 G 14	61°F			1013.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	21 mi	46 min	SSW 15 G 19	59°F			1014.3 hPa
FTPC1 - 9414290 - San Francisco, CA	22 mi	46 min	WSW 5.1 G 11	58°F	63°F		1014.3 hPa
RCMC1 - 9414863 - Richmond, CA	23 mi	46 min	S 6 G 8.9	62°F	65°F		1013.7 hPa
UPBC1	23 mi	46 min	NW 15 G 18
MZXC1 - 9415102 - Martinez-Amorco CA	23 mi	46 min	NW 15 G 18	69°F	69°F		1012.6 hPa
PCOC1 - 9415144 - Port Chicago, CA	24 mi	46 min	W 17 G 19	69°F	69°F		1012.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	25 mi	46 min	NW 15 G 19	71°F			1011.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	26 mi	46 min	WSW 9.9 G 13	64°F			1013.2 hPa
46237 - San Francisco Bar, CA (142)	30 mi	46 min			60°F	5 ft
SFXC1 - San Francisco Bay Reserve, CA	34 mi	91 min	W 12
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA	41 mi	26 min	SSE 5.8 G 7.8	56°F	56°F	5 ft	1014.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	49 mi	26 min	S 7.8 G 12	59°F		7 ft	1014.6 hPa	57°F

Wind History for Alameda, 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
Hayward, Hayward Air Terminal, CA	4 mi	22 min	WNW 8	10.00 mi	Fair	75°F	57°F	54%	1014.1 hPa
Oakland, Metro Oakland International Airport, CA	8 mi	23 min	WNW 10	10.00 mi	A Few Clouds	70°F	57°F	64%	1013.7 hPa
Livermore, Livermore Municipal Airport, CA	13 mi	23 min	WSW 7	10.00 mi	Fair	85°F	54°F	35%	1011.7 hPa
San Carlos Airport, CA	16 mi	20 min	N 8	10.00 mi	A Few Clouds	68°F	62°F	83%	1013.5 hPa
Palo Alto Airport, CA	16 mi	29 min	N 7	10.00 mi	Clear	72°F	60°F	69%	1013.5 hPa
San Francisco, San Francisco International Airport, CA	17 mi	20 min	NNE 7	9.00 mi	A Few Clouds	69°F	57°F	68%	1013.4 hPa
Concord, Buchanan Field, CA	19 mi	23 min	NNW 10	10.00 mi	Fair	82°F	55°F	40%	1010.8 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)

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Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California

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Tide / Current Tables for Oakland Airport SW, 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 (15,3,4,5)

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Ground Weather Radar Station San Francisco Bay Area, CA

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