Tuesday, September22, 2020
Privacy Policy
L-36.com

Marine Weather and Tides
San Jose, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:53AMSunset 7:06PM Monday September 21, 2020 10:13 PM PDT (05:13 UTC) Moonrise 10:52AMMoonset 9:14PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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
    EDIT      (on/off)   Help
PZZ535 Monterey Bay- 843 Pm Pdt Mon Sep 21 2020
Tonight..SE winds 5 to 15 kt, becoming north around 5 kt after midnight. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 8 seconds and sw around 2 ft at 18 seconds. Patchy fog after midnight.
Tue..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft at 9 seconds and sw around 2 ft at 18 seconds. Patchy fog.
Tue night..N winds 5 to 15 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 10 seconds and sw around 2 ft at 17 seconds.
Wed..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 16 seconds.
Wed night..N winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell around 2 ft at 10 seconds and sw around 2 ft at 16 seconds.
Thu..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 2 to 3 ft at 18 seconds.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 16 seconds.
Fri..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft and sw around 2 ft.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft and sw around 2 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 843 Pm Pdt Mon Sep 21 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northwest winds over the northern and inner coastal waters tonight and Tuesday, winds easing Tuesday night into Wednesday morning. Mixed seas will persist with a shorter period northwest swell and a long period southwest swell. A more robust northwest swell will arrive across the waters by Friday morning.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS66 KMTR 220357 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 857 PM PDT Mon Sep 21 2020

SYNOPSIS. A seasonable weather pattern through midweek with temperatures running near normal. A dry cold front passes through the Bay Area on Thursday that will keep persistent onshore winds in place into Friday. Dramatic change in store for the weekend as high pressure quickly builds with increasing offshore wind pattern. Temperatures rapidly warming over the weekend with periods of offshore winds that will increase fire weather concerns as hot afternoons, low humidity and breezy offshore winds coincide. Strong ridge to stay in place at least through early next week.

DISCUSSION. as of 08:56 PM PDT Monday . Regional profilers continue to indicate a marine layer between 800-1,200 feet in depth this evening with stratus developing along the San Mateo Coastline to around portions of the Monterey Bay Region. Aloft, a short-wave trough pushing into northern California has allowed for mid/high level clouds to advect inland over the region. This may keep the boundary layer mixed a bit, yet still do expect low clouds to become a bit more widespread into Tuesday morning. With slight cooling aloft, look for temperatures to remain near to slightly below seasonal averages through the first half of the week with day-to-day fluctuations in the marine layer and associated coastal clouds. This said, the ongoing forecast remains on track with no updated anticipated at this time. For additional details, please see the previous forecast discussion below.

PREV DISCUSSION. as of 2:19 PM PDT Monday . Todays focus has actually been on the long range forecast and its potential impacts this weekend with less focus on the short term.

Short term: Marine layer locally just over 1200 feet with low clouds confined to the Monterey peninsula this afternoon while all other locations remain sunny. 24 hour temp trends show significant cooling compared to Sunday afternoon with most places running 4-8 degrees cooler while Watsonville and Salinas are running close to 20 degrees cooler. Weather pattern tonight through Weds will be zonal/onshore with some shortwave ridging by Weds. This should translate to seasonable temps with 70s/80s inland.

By Thursday a cold front will move into Northern California. Any rain looks to stay from Mendocino northward with perhaps some coastal drizzle, especially for the Sonoma coast on Thursday. Behind the front persistent onshore winds and lowering heights on Friday will keep temps running near to slightly below normal.

All attention then turns to the weekend forecast. Confidence increasing for potentially significant offshore wind event. Temps will warm rapidly on Saturday with highs bouncing well back into the 80s and lower 90s as a 594dm high builds off the coast with some offshore winds near the surface. Ensemble solutions remain consistent with building ridge leading to hotter temps and stronger offshore winds into Sunday. Would expect widespread highs into the 90s and even some lower 100s. The dry airmass will allow for decent night time cooling that should preclude widespread significant heat impacts though even the overnight lows will remain warmer than normal where the offshore winds blow all night.

Right now the peak of the winds looks to be Sunday morning for the North and East Bay hills but still several days out to dial in the details and exact timing. Confidence is high overall and Sunday does look to be hotter than Saturday as heights builds to at least 596dm with persistent offshore/drying winds. Interestingly enough the pattern looks to take hold for several days with the ridge anchored along the West Coast at least through Weds of next week. Right now the only hope of cooling looks to be a southerly wind reversal along the coast.

AVIATION. As of 5:34 PM PDT Monday . for 00Z TAFS. VFR across all terminals. Satellite imagery shows stratus has eroded from most areas, except for pockets in southern Monterey Bay and off the coast near Half Moon Bay. WNW winds are providing breezy conditions with a few stronger gusts through coastal gaps. Forecast calls for the marine layer to deepen through tonight, bringing lower clouds further inland overnight. Clouds are expected to scatter out on Tuesday morning by 17z.

Vicinity of KSFO . VFR, with a few clouds around 13k ft lingering around the terminal. Haze was reported earlier in the afternoon from PIREPs and surface obs but it appears to have mostly cleared out. The marine layer is expected to deepen overnight allowing the stratus to move back into the Bay Area for MVFR cigs overnight, possibly lowering to IFR. Clearing after 17z. Winds will increase Monday afternoon with strongest winds up to 20 kts

SFO Bridge Approach . Possible lowered slant-range vis from haze, otherwise similar to KSFO.

Monterey Bay Terminals . VFR for the terminals with low clouds lingering over southern and coastal portions of the bay. VFR should prevail into early evening with IFR/LIFR cigs moving in after approximately 04z. Breezy onshore winds continuing through early evening and calming overnight. Clearing expected after 17z on Tuesday with continued onshore flow for the afternoon.

MARINE. as of 08:56 PM PDT Monday . Gusty northwest winds over the northern and inner coastal waters tonight and Tuesday, winds easing Tuesday night into Wednesday morning. Mixed seas will persist with a shorter period northwest swell and a long period southwest swell. A more robust northwest swell will arrive across the waters by Friday morning.

BEACHES. as of 02:34 PM PDT Monday . A larger northwest swell arrives late Thursday evening and into Friday morning. The main impacts will be increased wave heights breaking near the shoreline and an increased risk of rip currents developing along coastal beaches. With the increase in temperatures inland expected this weekend, beachgoers should be mindful of the increased wave activity and rip currents. The wave activity is forecast to gradually decrease through the weekend, but caution is advised through at least Sunday morning.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Reyes to Pigeon Pt 0-10 nm until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM 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 until 3 AM



PUBLIC FORECAST: RGass/RWW AVIATION: Lorber/Canepa MARINE: Canepa BEACHES: DK

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 29 mi55 min WSW 6 G 8.9 67°F 74°F1014.8 hPa
ELXC1 - Elkhorn Slough Reserve, CA 31 mi88 min SSE 5.1 61°F 59°F
MLSC1 - Moss Landing, South Harbor, CA 32 mi107 min SSE 4.1 G 12 61°F 1009.6 hPa58°F
46092 - MBM1 38 mi64 min WNW 7.8 58°F 59°F1013.9 hPa (+0.6)
46240 - Cabrillo Point, Monterey Bay, CA (158) 44 mi47 min 60°F2 ft
AAMC1 - 9414750 - Alameda, CA 45 mi55 min WSW 7 G 8.9 63°F 69°F1014.2 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 46 mi43 min NNW 14 G 18 60°F 57°F1015.3 hPa58°F
LNDC1 46 mi55 min SW 4.1 G 5.1 63°F 1014 hPa
MEYC1 46 mi97 min SSW 5.1 G 8 60°F 63°F1014.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi55 min W 7 G 13
OBXC1 48 mi55 min 63°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 48 mi55 min SW 6 G 8.9 62°F 1014 hPa
46114 - West Monterey Bay, CA 49 mi47 min 56°F5 ft
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi55 min NE 1.9 G 4.1 61°F 1012.9 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last
24hr
W3
N2
NW3
NW3
NW3
NW4
NW4
NW3
SE1
SW1
S2
E1
N3
NW2
N4
N11
G14
N13
W12
G16
W12
G16
W15
W15
W11
G14
W8
W7
G10
1 day
ago
N2
NW1
SE2
S1
--
NW3
SW2
W1
S1
S1
--
S3
E3
E2
N3
N5
N8
NW10
NW11
NW8
NW7
N8
N10
W5
2 days
ago
--
S5
S3
S3
S3
NW6
N3
N5
NW4
G8
NW4
G7
N9
NW10
NW9
W10
W7
G10
W3
N4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA6 mi26 minN 010.00 miClear64°F55°F73%1014.9 hPa
San Jose, San Jose International Airport, CA11 mi20 minN 010.00 miPartly Cloudy66°F55°F68%1014.5 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi20 minN 010.00 miOvercast60°F57°F90%1015.1 hPa
Palo Alto Airport, CA24 mi3.4 hrsNW 1410.00 miA Few Clouds68°F53°F60%1013.2 hPa

Link to 5 minute data for KRHV

Wind History from RHV (wind in knots)
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hr----------------CalmCalmCalmCalmCalmCalmCalmNW6NW10NW11W10NW10NW10NW5NW4Calm
1 day ago------------------CalmCalmCalmCalmCalmCalmCalmNW8NW10NW9W11NW6NW7CalmCalm
2 days ago----------------CalmCalmCalmCalmNW6W6NW6NW5W5NW9
G14
NW8NW8NW8N8CalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Gold Street Bridge
Click for Map
Tue -- 12:09 AM PDT     -0.01 feet Low Tide
Tue -- 05:47 AM PDT     7.82 feet High Tide
Tue -- 06:56 AM PDT     Sunrise
Tue -- 12:04 PM PDT     2.55 feet Low Tide
Tue -- 01:04 PM PDT     Moonrise
Tue -- 05:09 PM PDT     10.17 feet High Tide
Tue -- 07:03 PM PDT     Sunset
Tue -- 10:59 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
-00.524.167.47.87.36.353.82.92.63.14.879.110.19.997.45.53.41.7

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Point 2.3 mi NE
Click for Map
Tue -- 02:35 AM PDT     1.45 knots Max Flood
Tue -- 06:02 AM PDT     -0.00 knots Slack
Tue -- 06:56 AM PDT     Sunrise
Tue -- 09:48 AM PDT     -0.77 knots Max Ebb
Tue -- 11:53 AM PDT     0.00 knots Slack
Tue -- 01:04 PM PDT     Moonrise
Tue -- 02:28 PM PDT     1.03 knots Max Flood
Tue -- 05:21 PM PDT     -0.00 knots Slack
Tue -- 07:04 PM PDT     Sunset
Tue -- 10:07 PM PDT     -1.35 knots Max Ebb
Tue -- 10:59 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.10.91.41.41.20.70-0.3-0.6-0.7-0.8-0.40.10.6110.70.2-0.2-0.6-1-1.2-1.4-1.1

Weather Map
       (on/off)   Help Weather Map
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
Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map


Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE.
. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply anyway. Disclaimer:
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.