Saturday, May30, 2020
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Marine Weather and Tides
Milpitas, 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 5:47AMSunset 8:23PM Saturday May 30, 2020 5:38 PM PDT (00:38 UTC) Moonrise 12:34PMMoonset 1:13AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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- 156 Pm Pdt Sat May 30 2020
Tonight..W winds up to 10 kt.
Sun..W winds up to 10 kt.
Sun night..W winds 5 to 10 kt.
Mon..W winds 5 to 10 kt.
Mon night..W winds up to 10 kt.
Tue..W winds up to 10 kt.
Tue night..W winds up to 10 kt.
Wed..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
PZZ500 156 Pm Pdt Sat May 30 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure west of san francisco will bring scattered showers and possible Thunderstorms through the afternoon hours. Moderate southerly winds along the inner waters will turn southwest tonight and decrease. Northwest winds will increase Sunday and Sunday night. A mixed northwest swell and a building southwest swell will impact the waters through the weekend.


7 Day Forecast for Marine Location Near Milpitas, CA
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location: 37.44, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 302349 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 449 PM PDT Sat May 30 2020

SYNOPSIS. Scattered showers and isolated thunderstorms will continue through late afternoon as an area of low pressure passes across the Bay Area. Precipitation is expected to end by this evening as the low shifts north of the area. Seasonable to slightly below normal temperatures are forecast for Sunday into Monday, along with dry conditions. Midweek warming is then likely, especially inland, although the magnitude of the warming is uncertain at this time.

DISCUSSION. As of 1:35 PM PDT Saturday . The center of an upper low is currently passing directly over the SF Bay Area as it continues to move to the northeast. KMUX radar indicates shower activity has been increasing since late morning, especially across interior portions of the East Bay where heaviest showers are currently located. In addition, an isolated thunderstorm recently developed over Henry Coe State Park in eastern Santa Clara County and a cloud flash was recently detected near Clayton in Contra Costa County. Isolated thunderstorms will likely continue for the remainder of the afternoon.

Rain totals from last night and today have generally been less than a tenth of an inch. The exception is in the Santa Lucia Mountains near the Big Sur Coast. Upslope precipitation enhancement near the Big Sur Coast has resulted in rain totals of between a quarter and a half inch. One location in far southwest Monterey County (Three Peaks) has picked up nearly an inch of rain.

The upper low is forecast to accelerate to the northeast by late this afternoon and most models indicate shower activity will quickly come to an end by early evening. However, the latest HRRR keeps isolated pockets of light rain near the coast well into the evening hours. Considerable low level moisture left over from this system will likely result in widespread low cloud cover overnight.

The upper low will have moved well to our northeast by Sunday, and dry weather is expected to return to all areas. However, temperatures will remain slightly cooler than normal through Monday as the next trough deepens offshore along 130W. Also, residual low level moisture and onshore flow may mean persistent low cloud cover in coastal areas into the afternoon hours.

The trough will continue to deepen offshore and form a cutoff low off the southern California coast by Tuesday. It is at this point when the models diverge significantly on temperatures. The ECMWF, which develops the cutoff low farther offshore compared to the GFS, and therefore develops higher highs and a warmer airmass over California, forecasts significantly warmer temperatures than the GFS from Tuesday through Thursday. The model temperatures differences peak on Wednesday when the ECMWF MOS forecast high temperatures are anywhere from 10 to 15 degrees warmer than the GFS MOS guidance. The model blend (NBM) temperatures are in between, as would be expected, but slightly favor the warmer ECMWF. The NBM temperatures are probably the best option for now.

In the longer range, models agree that another trough will approach from the west late in the week, ejecting the cutoff low to the east. The latest GFS develops precip across the far southern portion of our area late on Thursday as the upper low moves inland across southern California. Rain chances then develop across the northern portion of our area next weekend as that next trough moves in.

AVIATION. as of 4:48 PM PDT Saturday . for 00z TAFs. Scattered showery activity is ongoing around the Bay Area, but the heaviest of rainfall is done. Lingering showers will continue for the North Bay as the system moves northeastward out of our region. Winds have already begun to switch to the northwest behind the center of low pressure and will continue to do so through the evening. Cloud cover will remain overnight. Most terminals will be MVFR, with isolated areas becoming IFR. VFR returns Sunday afternoon, with clouds remaining in the area above 3000 ft AGL. Winds will be more predominantly onshore and breezy in the afternoon.

Vicinity of KSFO . With the exception of a few low clouds, conditions are VFR with strong southerly winds. Scatter showers remain east of the terminal, and are decreasing. Lingering shower activity is expect tonight in the North Bay as the system moves northeast. Winds will slowly shift to the west through the evening, before easing overnight. Expect lowering cigs after 9z for MVFR conditions overnight. Cigs will lift above 3000 feet after 18z Sunday, but expect cloud cover to linger. Winds will be out of the northwest and breezy in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with clouds bases above 3500 feet. A few weak showers are over the ocean, but not expected to impact terminals overnight. Cigs will lower to MVFR after 4z, with IFR cigs possible early Sunday morning. A return to VFR Sunday afternoon as onshore winds return with a few stronger gusts in the Salinas Valley tomorrow.

MARINE. as of 01:56 PM PDT Saturday . Low pressure west of San Francisco will bring scattered showers and possible thunderstorms through the afternoon hours. Moderate southerly winds along the inner waters will turn southwest tonight and decrease. Northwest winds will increase Sunday and Sunday night. A mixed northwest swell and a building southwest swell will impact the waters through the weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay SCA . Pigeon Pt to Pt Pinos 0-10 nm



PUBLIC FORECAST: Dykema AVIATION: DK MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 17 mi50 min S 7 G 14 68°F 74°F1013.4 hPa
AAMC1 - 9414750 - Alameda, CA 31 mi50 min W 6 G 8.9 64°F 69°F1013.6 hPa
LNDC1 31 mi50 min W 7 G 11 64°F 1013.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 33 mi50 min W 9.9 G 13
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi50 min W 8 G 12 63°F 1013.5 hPa
OBXC1 34 mi50 min 63°F 59°F
PXSC1 36 mi50 min 64°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 36 mi50 min WSW 5.1 G 8.9 63°F 1012.6 hPa
FTPC1 - 9414290 - San Francisco, CA 39 mi50 min 63°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi50 min SW 15 G 19 63°F 1013.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi50 min W 5.1 G 8.9
RCMC1 - 9414863 - Richmond, CA 43 mi50 min SW 8 G 15 64°F 65°F1013.3 hPa
UPBC1 43 mi50 min W 19 G 23
PCOC1 - 9415144 - Port Chicago, CA 43 mi50 min W 13 G 17 68°F 71°F1012.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi50 min WSW 14 G 20 66°F 71°F1012.9 hPa
ELXC1 - Elkhorn Slough Reserve, CA 44 mi113 min WNW 6 65°F 59°F
46237 - San Francisco Bar, CA (142) 45 mi68 min 58°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 47 mi50 min WSW 15 G 20 64°F 1013.1 hPa
46092 - MBM1 48 mi130 min SSW 18 58°F 57°F1013.1 hPa (-0.4)

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, CA5 mi45 minSSW 12 G 2010.00 miMostly Cloudy68°F52°F57%1012.9 hPa
San Jose / Reid / Hillv, CA8 mi1.8 hrsW 710.00 miPartly Cloudy70°F53°F57%1013.5 hPa
Palo Alto Airport, CA11 mi1.9 hrsS 910.00 miOvercast72°F51°F50%1013.2 hPa
Hayward, Hayward Air Terminal, CA19 mi44 minNW 66.00 miLight Rain65°F55°F73%1014 hPa
Livermore, Livermore Municipal Airport, CA19 mi45 minW 1210.00 miA Few Clouds67°F57°F73%1012.5 hPa
San Carlos Airport, CA19 mi51 minS 1210.00 miOvercast68°F51°F56%1013.2 hPa
Oakland, Metro Oakland International Airport, CA24 mi45 minWNW 66.00 miLight Rain65°F57°F78%1013.6 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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1 day agoNW11NW10NW9NW7NW8NW6CalmSE3CalmCalmS3S6SE6SE8SE7SE6SE10E43S9SW11SW14SW19
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2 days agoNW12NW10N8NW8NW7NW5NW5NW5NW6NW5NW5NW5NW4CalmCalm3N4NW5N4NW6NW9NW12NW11NW12

Tide / Current Tables for Coyote Creek, Tributary #1, San Francisco Bay, California
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Coyote Creek
Click for Map
Sat -- 02:12 AM PDT     Moonset
Sat -- 03:11 AM PDT     2.25 feet Low Tide
Sat -- 05:49 AM PDT     Sunrise
Sat -- 07:13 AM PDT     7.16 feet High Tide
Sat -- 01:34 PM PDT     Moonrise
Sat -- 03:10 PM PDT     -0.35 feet Low Tide
Sat -- 08:22 PM PDT     Sunset
Sat -- 09:10 PM PDT     7.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.53.42.62.32.74.267.176.45.33.92.410.1-0.30.11.43.45.47.17.87.66.9

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 -- 12:04 AM PDT     -0.68 knots Max Ebb
Sat -- 02:13 AM PDT     Moonset
Sat -- 02:36 AM PDT     0.00 knots Slack
Sat -- 04:49 AM PDT     0.69 knots Max Flood
Sat -- 05:49 AM PDT     Sunrise
Sat -- 07:31 AM PDT     -0.00 knots Slack
Sat -- 12:12 PM PDT     -1.06 knots Max Ebb
Sat -- 01:34 PM PDT     Moonrise
Sat -- 02:46 PM PDT     0.00 knots Slack
Sat -- 05:40 PM PDT     1.30 knots Max Flood
Sat -- 08:22 PM PDT     Sunset
Sat -- 09:04 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.5-0.20.20.60.70.50.2-0.1-0.4-0.7-1-1.1-0.9-0.40.10.81.21.31.10.70-0.3-0.6

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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (20,4,5,8)
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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.