Friday, July10, 2020
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Marine Weather and Tides
San Jose, 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 5:53AMSunset 8:31PM Thursday July 9, 2020 10:33 PM PDT (05:33 UTC) Moonrise 10:48PMMoonset 9:19AM Illumination 77% Phase: Waning Gibbous; Moon at 19 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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PZZ535 Monterey Bay- 900 Pm Pdt Thu Jul 9 2020
Tonight..SW winds 5 to 15 kt, becoming nw after midnight. Wind waves 2 to 3 ft. NW swell 2 to 3 ft at 9 seconds.
Fri..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 2 to 3 ft at 9 seconds.
Fri night..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft at 8 seconds.
Sat..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 2 to 4 ft at 8 seconds.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft at 8 seconds.
Sun..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 2 to 4 ft at 8 seconds.
Sun night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft at 8 seconds.
Mon..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft.
Tue..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 4 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 900 Pm Pdt Thu Jul 9 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northerly winds will continue along the central california coast into the weekend. Winds will be moderate to locally strong through Friday evening. These winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels. Winds will begin to ease Friday night into Saturday as the high weakens but stronger winds may persist over the northern outer waters.


7 Day Forecast for Marine Location Near San Jose, CA
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location: 37.26, -121.78     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 100404 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 904 PM PDT Thu Jul 9 2020

SYNOPSIS. The remainder of the work week and into the upcoming weekend will experience a warming and drying trend, primarily across interior locations. Onshore flow will keep areas near the coast mild, along with areas of night and morning low clouds and fog. By early next wee, a slight cooling trend is forecast for inland areas.

DISCUSSION. as of 09:01 PM PDT Thursday . Afternoon temperatures Thursday mostly ranged from the upper 70s to the low 80s, with some inland areas reaching the upper 80s. Winds remain onshore and breezy, but the SFO-ACV gradient has climbed to 6.1 mb which is a driving factor to the clear skies over the entire region. A few clouds may move over land overnight, but otherwise it should remain mostly clear, with the exception being areas around the Monterey Bay as cloud cover should fill in again tonight.

The forecast remains on track. High pressure over the desert southwest is still forecast to move slowly toward the Bay Area initiating a warming and drying trend which will last through the weekend. No heat products are issued at this time, but temperatures will likely increase through the next several days into the 80s and 90s, with isolated areas in far inland portions of the North Bay, East Bay and Southern Monterey counties could see the 100s by Sunday. By Monday, the next upper level trough will move over Northern and portions of Central California providing some cooling.

PREV DISCUSSION. as of 01:50 PM PDT Thursday . Sunny skies blanket much of the Bay Area this afternoon. The morning low clouds rolled back to the immediate coast with a majority of the low clouds from Monterey Bay southward. The N-S gradient is still pretty robust at 5.6 mb keeping northern areas cloud free. Temperatures this afternoon are with in the ballpark of yesterday's temperatures - some places are up a few and other down a few. In the grand scheme of things it's a rather nice day around the Bay Area.

The big weather impact to the region, and moreso to the state, will be the building high pressure and resulting warm up. For about a week now models have shown a very impressive high pressure locking in over the Four Corners and nudging into CA. Latest 12Z model run still shows a 600+ DAM high building over the Desert Southwest/Four Corners region Friday and over the weekend. Needless to say, those heights at 500 mb are several standard deviations above normal. Extremely dangerous heat is being forecast in that region with numerous heat related warnings currently in effect. So what does this mean for the Bay Area? The ridge of high pressure will build slowly NW into the Bay Area, which will turn the temperature dial upward each day. Lingering onshore flow with some patchy night/morning low clouds will keep temperatures in check for coastal areas. The real warm up locally will be away from the coast and moreso in our far interior locations (N Napa and S Monterey/San Benito Counties). Sunday looks to be the warmest day with 850 mb temps reaching 26-28 C Highs Friday through Sunday will be 60/70s at the coast and 80/90s inland. Far interior locations will likely range from 100-104 over the weekend. Overnight lows will remain mild in the hills, but fortunately relief is expected in the valleys. Heat Risk potential remains in the low to moderate category with a few interior spots near high on Sunday.

The ridge of high pressure is forecast to weaken as another upper level trough approaches from the NW on Monday. The trough will usher in some subtle cooling on Monday and a little more cooling on Tuesday. It should be noted that even with the cooling on Monday and Tuesday temperatures will still be in the 80/90s away from the coast.

AVIATION. As of 4:45 PM PDT Thursday . Mainly clear skies will prevail through this evening with low clouds anticipated to return to coastal areas and locally inland tonight. IFR cigs are expected over the Monterey Area terminals as low clouds fill in over the Salinas Valley. The northerly gradient remains strong at over 6MB from ACV to SFO while the onshore gradient from SFO-WMC stands at 3.7 mb. This will likely allow low clouds to push in through the Golden Gate potentially impacting KOAK and KSFO late tonight.

Vicinity of KSFO . VFR. Moderately strong westerly winds will prevail this afternoon and gradually ease overnight. A few low clouds expected to advect into the Bay late tonight, potentially impacting KOAK and KSFO.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions with low clouds on the edge of MRY. Low clouds return between 03z-05z this evening for KMRY and KSNS. Moderate westerly winds will prevail this afternoon and gradually ease becoming light and variable overnight.

MARINE. as of 09:00 PM PDT Thursday . Northerly winds will continue along the Central California Coast into the weekend. Winds will be moderate to locally strong through Friday evening. These winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels. Winds will begin to ease Friday night into Saturday as the high weakens but stronger winds may persist over the northern outer waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: MM/DK AVIATION: CW MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 29 mi46 min N 5.1 G 6 64°F 74°F1014 hPa
ELXC1 - Elkhorn Slough Reserve, CA 31 mi49 min SSE 4.1 56°F 53°F
MLSC1 - Moss Landing, South Harbor, CA 32 mi22 min SSE 6 G 15 56°F 1014.2 hPa53°F
46092 - MBM1 38 mi75 min NW 14 56°F 56°F1012.5 hPa (-0.3)
AAMC1 - 9414750 - Alameda, CA 45 mi46 min 72°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 46 mi174 min NW 19 G 23 1013.5 hPa
LNDC1 46 mi46 min SSW 2.9 G 4.1 63°F 1013.3 hPa
MEYC1 46 mi58 min 57°F 64°F1014.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi46 min SSW 5.1 G 7
OBXC1 48 mi46 min 62°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 48 mi46 min SW 6 G 8 63°F 1013.3 hPa
46114 - West Monterey Bay, CA 49 mi38 min 55°F8 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi46 min WSW 4.1 G 6 62°F 1012.4 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA6 mi44 minWNW 510.00 miClear72°F51°F50%1013.5 hPa
San Jose, San Jose International Airport, CA11 mi41 minNNW 710.00 miFair68°F53°F59%1013.4 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi41 minSE 310.00 miFair57°F53°F87%1014.2 hPa

Link to 5 minute data for KRHV

Wind History from RHV (wind in knots)
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Last 24hr----------------S5S7S3NW3CalmCalmN8NW8NW8NW8NW11NW9W9NW7N7NW5
1 day ago----------------3CalmCalmCalm4N44NW8NW7NW10NW9NW13--NW8W8NW6
2 days ago----------------CalmCalmCalmCalmN4CalmNW8NW10NW7NW11NW8NW11NW9W7NW64

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Fri -- 12:12 AM PDT     2.97 feet Low Tide
Fri -- 04:23 AM PDT     8.22 feet High Tide
Fri -- 05:56 AM PDT     Sunrise
Fri -- 11:18 AM PDT     Moonset
Fri -- 12:20 PM PDT     0.26 feet Low Tide
Fri -- 06:19 PM PDT     8.36 feet High Tide
Fri -- 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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33.44.96.88.18.17.56.44.93.31.90.80.30.51.83.75.77.48.38.27.56.45.24

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
Fri -- 02:02 AM PDT     0.79 knots Max Flood
Fri -- 04:50 AM PDT     -0.01 knots Slack
Fri -- 05:56 AM PDT     Sunrise
Fri -- 09:27 AM PDT     -1.09 knots Max Ebb
Fri -- 11:18 AM PDT     Moonset
Fri -- 12:09 PM PDT     0.00 knots Slack
Fri -- 02:54 PM PDT     1.17 knots Max Flood
Fri -- 06:20 PM PDT     -0.01 knots Slack
Fri -- 08:30 PM PDT     Sunset
Fri -- 10:09 PM PDT     -0.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.60.80.70.4-0-0.4-0.7-0.9-1.1-1-0.6-0.10.511.210.70.2-0.2-0.4-0.6-0.7-0.6

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (1,6,7,8)
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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.