Monday, August10, 2020
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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.

Sunrise 6:19AMSunset 8:08PM Monday August 10, 2020 12:16 PM PDT (19:16 UTC) Moonrise 11:00PMMoonset 11:55AM Illumination 57% Phase: Waning Gibbous; Moon at 21 days in cycle
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.
Marine Forecasts
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PZZ531 San Francisco Bay South Of The Bay Bridge- 820 Am Pdt Mon Aug 10 2020
Rest of today..NW winds 5 to 15 kt.
Tonight..NW winds 5 to 15 kt.
Tue..NW winds 5 to 15 kt.
Tue night..NW winds 5 to 15 kt.
Wed..NW winds 5 to 15 kt.
Wed night..NW winds up to 10 kt.
Thu..W winds 5 to 15 kt.
Fri..W winds 5 to 15 kt.
PZZ500 820 Am Pdt Mon Aug 10 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... 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.


7 Day Forecast for Marine Location Near Castro Valley, CA
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location: 37.71, -122.07     debug


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

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 13 mi46 min NW 5.1 G 8 63°F 1013.9 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi46 min W 6 G 8 62°F 70°F1014.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi46 min WNW 8 G 9.9
RTYC1 - 9414523 - Redwood City, CA 16 mi46 min N 7 G 8.9 65°F 74°F1014.1 hPa
OBXC1 16 mi46 min 60°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi46 min NW 8.9 G 9.9 59°F 1014.1 hPa
PXSC1 18 mi46 min 61°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 18 mi46 min W 8 G 14 61°F 1013.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi46 min SSW 15 G 19 59°F 1014.3 hPa
FTPC1 - 9414290 - San Francisco, CA 22 mi46 min WSW 5.1 G 11 58°F 63°F1014.3 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi46 min S 6 G 8.9 62°F 65°F1013.7 hPa
UPBC1 23 mi46 min NW 15 G 18
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi46 min NW 15 G 18 69°F 69°F1012.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 24 mi46 min W 17 G 19 69°F 69°F1012.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 25 mi46 min NW 15 G 19 71°F 1011.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi46 min WSW 9.9 G 13 64°F 1013.2 hPa
46237 - San Francisco Bar, CA (142) 30 mi46 min 60°F5 ft
SFXC1 - San Francisco Bay Reserve, CA 34 mi91 min W 12
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 41 mi26 min SSE 5.8 G 7.8 56°F 56°F5 ft1014.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi26 min S 7.8 G 12 59°F 7 ft1014.6 hPa57°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA4 mi22 minWNW 810.00 miFair75°F57°F54%1014.1 hPa
Oakland, Metro Oakland International Airport, CA8 mi23 minWNW 1010.00 miA Few Clouds70°F57°F64%1013.7 hPa
Livermore, Livermore Municipal Airport, CA13 mi23 minWSW 710.00 miFair85°F54°F35%1011.7 hPa
San Carlos Airport, CA16 mi20 minN 810.00 miA Few Clouds68°F62°F83%1013.5 hPa
Palo Alto Airport, CA16 mi29 minN 710.00 miClear72°F60°F69%1013.5 hPa
San Francisco, San Francisco International Airport, CA17 mi20 minNNE 79.00 miA Few Clouds69°F57°F68%1013.4 hPa
Concord, Buchanan Field, CA19 mi23 minNNW 1010.00 miFair82°F55°F40%1010.8 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hrW8W11W11W11NW10NW9NW10NW11NW8NW6NW5NW6NW3NW4NW5N6NW4NW4NW3NW3CalmW6W8W8
1 day agoW8NW10NW9NW9
G16
NW11NW9NW10N7NW8NW7NW5NW4NW4NW5NW4NW3NW4NW4CalmCalmCalmW5W5W5
2 days agoW5W7W10W10NW10NW11NW10N8NW6NW4NW4NW5NW4NW3NW5CalmCalmN3CalmN4NW3W6W6W7

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
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Roberts Landing
Click for Map
Mon -- 12:21 AM PDT     2.12 feet Low Tide
Mon -- 05:37 AM PDT     5.43 feet High Tide
Mon -- 06:20 AM PDT     Sunrise
Mon -- 11:56 AM PDT     2.04 feet Low Tide
Mon -- 12:55 PM PDT     Moonset
Mon -- 06:04 PM PDT     6.71 feet High Tide
Mon -- 08:06 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.32.93.84.75.35.45.14.43.62.82.222.43.24.35.46.36.76.55.94.93.92.9

Tide / Current Tables for Oakland Airport SW, South San Francisco Bay, California Current
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Oakland Airport SW
Click for Map
Mon -- 02:36 AM PDT     0.38 knots Max Flood
Mon -- 05:44 AM PDT     -0.00 knots Slack
Mon -- 06:20 AM PDT     Sunrise
Mon -- 08:14 AM PDT     -0.46 knots Max Ebb
Mon -- 11:27 AM PDT     0.00 knots Slack
Mon -- 12:55 PM PDT     Moonset
Mon -- 02:47 PM PDT     0.42 knots Max Flood
Mon -- 05:57 PM PDT     -0.00 knots Slack
Mon -- 08:06 PM PDT     Sunset
Mon -- 08:47 PM PDT     -0.58 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.40.40.30.1-0.1-0.3-0.5-0.4-0.2-0.10.10.30.40.40.30.2-0-0.3-0.5-0.6-0.5-0.3

Weather Map
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wmap_P
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
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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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 numerous 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.