Thursday, July2, 2020
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Marine Weather and Tides
San Mateo, 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 5:51AMSunset 8:35PM Thursday July 2, 2020 2:52 PM PDT (21:52 UTC) Moonrise 5:25PMMoonset 2:38AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 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- 816 Am Pdt Thu Jul 2 2020
.small craft advisory in effect until 9 am pdt this morning...
.small craft advisory in effect from 3 pm pdt this afternoon through this evening...
Today..SW winds 10 to 20 kt with gusts up to 30 kt.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 5 to 15 kt with gusts up to 25 kt.
Independence day..SW winds 5 to 15 kt with gusts up to 25 kt.
Sat night..SW winds 5 to 15 kt.
Sun..W winds 10 to 20 kt with gusts up to 25 kt.
Mon..W winds 10 to 20 kt with gusts up to 25 kt.
PZZ500 816 Am Pdt Thu Jul 2 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to strong northwest winds will continue over the northern outer waters today. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Generally light to moderate winds expected elsewhere as high pressure weakens off the california coast and a low pressure system develops off the pacific northwest. Winds will begin to subside tonight and tomorrow, though locally breezy conditions over the northern outer waters will persist into the weekend. A long-period southerly swell train will arrive late tonight into tomorrow. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.


7 Day Forecast for Marine Location Near San Mateo, CA
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location: 37.59, -122.31     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 021757 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1057 AM PDT Thu Jul 2 2020

SYNOPSIS. Seasonal temperatures today, followed by warming through Independence Day, with minor day to day changes possible next week. Light to moderate onshore flow will prevail through the period, along with areas of night and morning coastal low clouds and fog.

DISCUSSION. as of 8:50 AM PDT Thursday . The marine layer is evident on visible satellite imagery this morning along the coast and the inland valleys. The Bodega Bay profiler suggests a depth of around 2000 feet while the Fort Ord Profiler is closer to 2500 feet this morning. Northwest winds and a drier air mass rounding Cape Mendocino have scoured out a hole in the marine layer farther offshore but no holes exist in the stratus along the immediate coast. A surface eddy is driving weak southwest winds and helping to reinforce the marine layer inland from the thicker layer to the south rather than the drier air from the northwest. As such, could see the low clouds linger through the mid to late morning for marine influenced sites. No significant concerns today with somewhat below normal temperatures (3-11 degrees) across the region.

High pressure builds from the desert southwest over the next few days and will bring a warming/drying trend which will peak on Saturday (Independence Day). Temperatures will rise to become slightly to somewhat above seasonable conditions, mainly inland, where afternoon highs will be in the mid 80s to mid 90s, meanwhile (San Jose, Concord, Livermore, Santa Rosa, Napa), the San Francisco Bay/Monterey Bay Shorelines will be in the low 70s to low 80s. A period of north to northwest winds Saturday night into Sunday morning will exacerbate fire weather risk for the North Bay hills and mountains. Meanwhile, low humidity values will elevate fire weather risk given the increase in the number of fire works being shot off this weekend, especially given that the local WRF suggests a compression and significant weakening of the marine layer by Saturday night. That said, the main fire risk will be from human related activities through the holiday weekend (rather than from the weather conditions) so please be mindful of any outdoor activities that may lead to a spark that could ignite a wildfire.

No updates planned this morning. See previous discussion for more details on the current forecast.

PREVIOUS DISCUSSION. as of 3:15 AM PDT Thursday . A retrograding upper level low over the PacNW and broad upper trough covering much of the West Coast continues to be the large scale weather features of note. The lowering 500 mb heights, decreasing N-S gradient and continued onshore flow allowed for a better marine layer push overnight. Satellite fog product shows solid stratus along the entire coastline, up the Salinas Valley, in San Francisco Bay and even in the North Bay Valleys. Fort Ord Profiler puts the depth at near 2,000 feet. The deeper marine layer has reduced chances for dense fog, but patchy fog and some coastal drizzle are still possible early this morning. Today's weather will be similar to Wednesday with inland sunshine and coastal clouds. Temperatures will be with in a few degrees of yesterday or 60/70s coast and 80/90s interior.

The current forecast for Friday and the upcoming holiday weekend remain on track. The upper trough begins to lift northward on Friday as a ridge of high pressure builds in from the Desert Southward. Friday will feature a slight upward trend in temperatures, but more noticeable warming will occur over the holiday weekend. No major heat risk concerns with the warm up, but temperatures away from the coast will be above seasonal averages. Lack of strong offshore flow or strong northerly gradients will keep night/morning low clouds in the forecast as well.

One potential item of concern for the upcoming holiday weekend will be a very dry airmass moving in over the region Saturday night/early Sunday morning. Lastest local WRF model develops weak offshore flow at 2500 feet with lowering humidity 25-35% over higher terrain. Fortunately, winds do not appear to overly strong Saturday night. Nonetheless, dry and mild conditions in the hills combine with possible fireworks will heighten fire weather concerns.

High pressure retreats southward on Monday as another trough approaches from the NW. A slight cooling trend develops early next week. The latest medium range models keep cooling trend for much of next week with night/morning clouds.

AVIATION. As of 10:57 AM PDT Thursday . For 18Z TAFs. The marine stratus continues to mix-out over the land as of the 18Z TAF publication time with VFR conditions reported around the SF Bay shoreline. There are still some lingering low clouds in parts of the North Bay around STS, as well as in the Salinas Valley near SNS. MRY continues to be blanketed in low clouds. Light winds this morning will increase onshore as the day progresses. Forecast models bring the low clouds back again in the evening/overnight hours.

Vicinity of KSFO . VFR conditions are forecast to prevail for the rest of the morning and afternoon with winds becoming westerly around 15 kt by the afternoon. Models suggest SFO has a better shot of low clouds overnight tonight and into tomorrow.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Low clouds are slowly mixing-out around MRY and SNS this morning. With the deep marine layer, portions of the Monterey Bay Area/Peninsula may likely see the clouds all day long. Areas that do clear will see the low clouds return in the late afternoon/evening hours.

MARINE. as of 8:16 AM PDT Thursday . Moderate to strong northwest winds will continue over the northern outer waters today. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Generally light to moderate winds expected elsewhere as high pressure weakens off the California coast and a low pressure system develops off the Pacific Northwest. Winds will begin to subside tonight and tomorrow, though locally breezy conditions over the northern outer waters will persist into the weekend. A long-period southerly swell train will arrive late tonight into tomorrow. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . SF Bay from 3 PM



PUBLIC FORECAST: DRP/MM AVIATION: Rowe MARINE: Rowe

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi58 min NNW 9.9 G 12 67°F 74°F1012.7 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi58 min W 8 G 9.9 65°F 68°F1012.7 hPa
LNDC1 14 mi58 min W 8.9 G 13 65°F 1012.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi58 min WNW 11 G 14
OBXC1 15 mi58 min 62°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi58 min WNW 13 G 15 62°F 1012.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi58 min W 8 G 14 65°F 1011.7 hPa
PXSC1 15 mi58 min 65°F 54°F
FTPC1 - 9414290 - San Francisco, CA 17 mi58 min SSW 13 G 23 61°F 63°F1013.3 hPa
46237 - San Francisco Bar, CA (142) 22 mi52 min 58°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi54 min N 7 61°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi64 min WSW 16 G 23 61°F 1012.9 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi58 min SSW 8.9 G 15 61°F 64°F1012.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi42 min S 7.8 G 12 56°F 56°F1014 hPa53°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi58 min WSW 15 G 18 65°F 1011.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi58 min W 14 G 18 69°F 69°F1011.4 hPa
UPBC1 33 mi58 min WNW 15 G 20
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi42 min S 12 G 18 55°F 1014 hPa52°F
PCOC1 - 9415144 - Port Chicago, CA 35 mi58 min W 19 G 22 70°F 71°F1010.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi58 min NW 16 G 20 72°F 1010.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi67 min W 12

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi56 minVar 410.00 miA Few Clouds69°F53°F57%1012.3 hPa
San Carlos Airport, CA5 mi65 minN 910.00 miClear68°F55°F64%1012.5 hPa
Oakland, Metro Oakland International Airport, CA9 mi59 minWNW 710.00 miA Few Clouds74°F52°F46%1012.4 hPa
Hayward, Hayward Air Terminal, CA11 mi58 minW 910.00 miFair72°F51°F48%1012.9 hPa
Half Moon Bay Airport, CA11 mi57 minS 16 G 215.00 miFair with Haze61°F53°F77%1013.9 hPa
Palo Alto Airport, CA13 mi65 minN 1010.00 miClear72°F55°F57%1011.8 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrNW12NW11NW12
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NW12NW11NW9NW7NW5NW6S8S10S8S6S5S5S6S9S8SE3NE5NE6N10NE74
1 day agoW18NW15--W24W19W15W11NW10NW8NW4NW4NW4NW4NW5W8W4CalmCalmSE5E5NE5NE6NE6NE5
2 days agoNW15W17W18W17NW14NW12NW15NW10NW9NW8NW8NW10NW10NW8W7W8NW5CalmNE3NE4NE5NW13NW11NW12

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Thu -- 03:38 AM PDT     Moonset
Thu -- 05:12 AM PDT     -0.83 feet Low Tide
Thu -- 05:52 AM PDT     Sunrise
Thu -- 11:43 AM PDT     5.76 feet High Tide
Thu -- 04:43 PM PDT     2.48 feet Low Tide
Thu -- 06:25 PM PDT     Moonrise
Thu -- 08:34 PM PDT     Sunset
Thu -- 10:45 PM PDT     8.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.54.82.91.1-0.2-0.8-0.60.41.73.34.75.65.75.24.43.42.72.53.14.35.87.28.18.3

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 02:45 AM PDT     -1.99 knots Max Ebb
Thu -- 03:38 AM PDT     Moonset
Thu -- 05:52 AM PDT     Sunrise
Thu -- 06:16 AM PDT     0.01 knots Slack
Thu -- 09:15 AM PDT     1.95 knots Max Flood
Thu -- 12:44 PM PDT     -0.01 knots Slack
Thu -- 03:24 PM PDT     -0.90 knots Max Ebb
Thu -- 06:02 PM PDT     0.00 knots Slack
Thu -- 06:24 PM PDT     Moonrise
Thu -- 08:34 PM PDT     Sunset
Thu -- 08:46 PM PDT     1.50 knots Max Flood
Thu -- 11:52 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-1.5-1.9-2-1.7-1.1-0.30.81.61.91.91.40.7-0.2-0.7-0.9-0.8-0.6-00.81.41.51.30.7

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (17,4,5,8)
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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.