Saturday, July11, 2020
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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.

Sunrise 5:55AMSunset 8:31PM Saturday July 11, 2020 8:25 PM PDT (03:25 UTC) Moonrise 11:41PMMoonset 11:15AM Illumination 59% 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 232 Pm Pdt Sat Jul 11 2020
Rest of today..SW winds 10 to 20 kt with gusts up to 25 kt.
Tonight..SW winds 5 to 15 kt.
Sun..SW winds 5 to 15 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 20 kt with gusts up to 25 kt.
Mon..SW winds 15 to 25 kt with gusts up to 30 kt.
Mon night..SW winds 10 to 20 kt with gusts up to 25 kt.
Tue..SW winds 10 to 20 kt with gusts up to 30 kt.
Wed..SW winds 5 to 15 kt.
PZZ500 232 Pm Pdt Sat Jul 11 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A robust northerly gradient will bring moderate to locally gusty northwest winds across the coastal waters through the weekend. These winds will generate steep fresh swell which will result in hazardous conditions for small craft vessels in the coastal waters. Locally moderate winds will also be present around angel island in the northern san francisco bay. Otherwise, a light longer period south swell will be mixed in with the steep fresh northwest swell.


7 Day Forecast for Marine Location Near Sunnyvale, CA
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location: 37.42, -121.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 112344 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 444 PM PDT Sat Jul 11 2020

SYNOPSIS. High pressure will dominate the weather pattern over the region this weekend resulting in very warm temperatures across the interior. Continued onshore flow will keep conditions near the coast cooler, yet still mild. A subtle cooling trend is on track to occur early next week.

DISCUSSION. as of 02:02 PM PDT Saturday . Marine layer has become nearly non-existent with the remainder of it having either dissipated over the Monterey Peninsula or traveled down to coastal southern Monterey county. Diurnal heating has resulted in temps up in the low-to-mid-90s around the East Bay, with locations within the Livermore Valley reporting temps between 92-97 F. A fire broke out due east of San Jose earlier today, where southwest winds and temps between 85-95 F have been prevalent. Thankfully, winds have remained light at 3-8 mph with gusts of 13 mph in that area, and the fire is fully contained at the time of this discussion's release. Similarly, low-to-mid RH values coupled with high temperatures can be found in other locations across the CWA, including interior portions of Monterey and San Benito counties and patches of the North Bay interior. Warm conditions and RH values in the 20s and low 30s are expected across that area going into the evening, with some isolated locations likely to record RH values in the teens. Thankfully, winds will remain light due to the upper-level ridge set up, but fire concerns will persist through tonight and going into Sunday.

The main focus for tonight's conditions will be the warmth and the low RH values across the interior. Minimum temps across several high-elevation locations remained fairly warm last night, with several sites along the East Hills reporting low-70s. We should expect for similar poor temperature recoveries across the interior tonight, along with poor humidity recoveries as the ridge reaches its maximum extent during the overnight hours and into early Sunday morning.

Sunday will be our warmest day across the CWA, with mild conditions dominating coastal areas tomorrow as the marine layer remains compressed and allows for greater diurnal heating. Temps along the coast will fall within the 65-75 F range. The interior is progged for much higher temps ranging from 95-100, with some isolated locations getting into the low 100s. Weak onshore flow is to be expected tomorrow as well, which will help to mitigate fire weather concerns. Models are suggesting that the stable conditions from the upper-level ridge will result in weak offshore flow. Nevertheless, the poor humidity recoveries along with warm mins overnight will still result in elevated fire weather and heat concerns for the day.

Looking ahead into next week, heights will fall across the CWA as the upper-level ridge weakens and allows for the intrusion of a disturbance off the Pacific into BC. Troughing will gradually become the more dominating upper-level pattern during the first half of next week, allowing for temperatures will return closer to seasonal averages. This disturbance will also allow for the marine layer to recover, bringing coastal locations back to more seasonal conditions as well. Expect the main setup for next week to be the cooling pattern as we see the gradual shift in our upper-level setup as the ridge weakens and makes its way out of the southwest as this trough takes over.

AVIATION. as of 4:42 PM PDT Saturday . for 00z TAFs. VFR, with breezy northwesterly winds, and the occasional stronger gusts. Large scale weather pattern remains in place, so forecast is very similar to last night featuring a compressed marine layer with a few clouds along the coast and bayshore, but otherwise VFR and light onshore winds. Chance for thicker low clouds near the Monterey Peninsula. Sunday is forecast for VFR with breezier onshore winds in the afternoon.

Vicinity of KSFO . VFR. Winds remain northwesterly around 20 kts and the chance of a few stronger gusts will persist through the early evening. Winds will dial back but remain breezy overnight. A few clouds near the terminal overnight, but forecast to remain VFR through the TAF period. Winds are once again expected to be strong in the afternoon and out of the northwest.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Northerly winds are breezy with VFR conditions. Most of tonight will be VFR but lower cigs may develop in the early morning hours for coastal terminals. Winds will ease overnight before picking up on Sunday. VFR is forecast with breezier onshore flow.

MARINE. as of 02:32 PM PDT Saturday . A robust northerly gradient will bring moderate to locally gusty northwest winds across the coastal waters through the weekend. These winds will generate steep fresh swell which will result in hazardous conditions for small craft vessels in the coastal waters. Locally moderate winds will also be present around Angel Island in the northern San Francisco Bay. Otherwise, a light longer period south swell will be mixed in with the steep fresh northwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm until 9 PM



PUBLIC FORECAST: Diaz AVIATION: DK MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi55 min W 8.9 G 11 75°F 75°F1015.2 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi55 min W 6 G 8 66°F 72°F1014.9 hPa
LNDC1 30 mi55 min WSW 8 G 9.9 68°F 1014.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi55 min WSW 8.9 G 11
OBXC1 33 mi55 min 66°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi55 min W 5.1 G 6 66°F 1014.6 hPa
PXSC1 34 mi55 min 65°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi55 min ESE 1.9 G 2.9 65°F 1013.8 hPa
FTPC1 - 9414290 - San Francisco, CA 37 mi55 min WSW 15 G 22 60°F 62°F1014.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi55 min SSW 9.9 G 16 62°F 1014.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi57 min S 5.1 65°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi55 min S 7 G 12 66°F 67°F1014.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi55 min WNW 9.9 G 13 83°F 1012.6 hPa
UPBC1 43 mi55 min WNW 12 G 14
46237 - San Francisco Bar, CA (142) 43 mi55 min 58°F5 ft
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi55 min W 11 G 12 84°F 70°F1013.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi55 min W 4.1 G 6 85°F 74°F1012.9 hPa
MLSC1 - Moss Landing, South Harbor, CA 44 mi173 min SW 8.9 G 26 59°F 1016.2 hPa53°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi100 min SSW 6 62°F 55°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi55 min SW 8.9 G 11 78°F 1013.3 hPa
46092 - MBM1 46 mi66 min NW 14 56°F 55°F1014.6 hPa (-1.8)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi45 min NNW 18 G 23 56°F 1016.6 hPa53°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi45 min NW 19 G 23 56°F 55°F1015.8 hPa53°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA4 mi32 minNW 1110.00 miFair78°F50°F37%1014.5 hPa
Palo Alto Airport, CA8 mi4.4 hrsNNW 1510.00 miClear79°F59°F51%1015.6 hPa
San Jose / Reid / Hillv, CA10 mi38 minWNW 810.00 miClear82°F42°F25%1014.6 hPa
San Carlos Airport, CA16 mi94 minW 810.00 miClear79°F46°F32%1014.6 hPa
Hayward, Hayward Air Terminal, CA18 mi31 minSW 410.00 miFair69°F54°F59%1015.5 hPa
Livermore, Livermore Municipal Airport, CA21 mi32 minWSW 510.00 miFair88°F21°F9%1013.3 hPa
Oakland, Metro Oakland International Airport, CA23 mi32 minW 1310.00 miFair69°F54°F59%1014.7 hPa
San Francisco, San Francisco International Airport, CA24 mi29 minNW 1410.00 miFair64°F50°F60%1014.5 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrNW8NW5NW4NW3N3NW5NW4NW3CalmCalmCalmNW3CalmCalm3NW6NW7NW7NW10NW12NW13N11NW11NW11
1 day agoNW7N7NW3NW3CalmCalmCalmNW3NW3NW4N4NW3Calm5NW75NW8N6NW8NW10NW12NW11NW9NW8
2 days agoNW9NW8N4N4CalmN4N4N4CalmSE6S8SE533CalmN6NW8N10
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Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Sat -- 12:15 AM PDT     Moonrise
Sat -- 01:16 AM PDT     2.78 feet Low Tide
Sat -- 05:17 AM PDT     7.37 feet High Tide
Sat -- 05:56 AM PDT     Sunrise
Sat -- 12:15 PM PDT     Moonset
Sat -- 01:03 PM PDT     0.80 feet Low Tide
Sat -- 06:56 PM PDT     8.50 feet High Tide
Sat -- 08:30 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.22.83.14.56.27.37.36.75.74.43.11.91.10.81.32.74.76.688.58.27.36.24.9

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Sat -- 12:15 AM PDT     Moonrise
Sat -- 12:45 AM PDT     0.00 knots Slack
Sat -- 02:58 AM PDT     0.68 knots Max Flood
Sat -- 05:47 AM PDT     -0.00 knots Slack
Sat -- 05:56 AM PDT     Sunrise
Sat -- 10:15 AM PDT     -0.91 knots Max Ebb
Sat -- 12:15 PM PDT     Moonset
Sat -- 12:54 PM PDT     0.00 knots Slack
Sat -- 03:39 PM PDT     1.03 knots Max Flood
Sat -- 07:02 PM PDT     -0.00 knots Slack
Sat -- 08:30 PM PDT     Sunset
Sat -- 11:00 PM PDT     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.30.10.50.70.60.3-0.1-0.3-0.6-0.8-0.9-0.8-0.40.10.6110.90.50-0.3-0.5-0.7-0.7

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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
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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.