Saturday, December7, 2019
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Marine Weather and Tides
Santa Clara, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:06AMSunset 4:51PM Saturday December 7, 2019 1:08 AM PST (09:08 UTC) Moonrise 2:28PMMoonset 2:31AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 836 Pm Pst Fri Dec 6 2019
.gale warning in effect until 3 am pst Saturday...
Tonight..S winds 20 to 30 kt with gusts up to 40 kt. Wind waves 9 to 10 ft. W swell 7 to 9 ft at 16 seconds. Showers.
Sat..S winds 20 to 30 kt with gusts up to 35 kt. Wind waves 7 to 8 ft. W swell 8 to 10 ft at 14 seconds. Showers and a slight chance of Thunderstorms.
Sat night..SW winds 10 to 15 kt. Wind waves 5 to 6 ft. W swell 8 to 10 ft at 13 seconds. Rain.
Sun..NW winds up to 10 kt. Wind waves 2 to 3 ft. W swell 6 to 8 ft at 12 seconds. Rain likely.
Sun night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 6 ft at 11 seconds and S around 2 ft at 16 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 ft. W swell 4 to 5 ft at 15 seconds and S around 2 ft at 16 seconds.
Mon night..N winds 5 to 10 kt. Wind waves 1 ft. W swell 4 to 5 ft at 15 seconds and S around 2 ft at 16 seconds.
Tue..N winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft.
Wed..N winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 6 ft and S around 2 ft. Winds and wind waves higher in and near Thunderstorms.
PZZ500 836 Pm Pst Fri Dec 6 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A pair of frontal boundaries will move through the waters from north to south over the next 24 to 36 hours bringing unsettled weather. Scattered Thunderstorms have been detected over the outer waters and could move into the northern waters on Saturday. Gale force southerly winds can be expected through early Saturday before slowly decreasing.


7 Day Forecast for Marine Location Near Santa Clara, CA
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location: 37.38, -121.9     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 070648 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1048 PM PST Fri Dec 6 2019

SYNOPSIS. Southerly winds will continue to ramp up ahead of an incoming cold front. Rain will develop across the North Bay this afternoon and then spread southward overnight. Showery and cool on Saturday with isolated thunderstorms possible. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns Monday and Tuesday with a slight chance of rain by midweek.

DISCUSSION. as of 09:15 PM PST Friday . A potent cold front continues to march through the Bay Area this evening producing light to moderate rain with pockets of heavy rain. If there is one thing to be said about the evolution of the front is slower. Several days ago models had the front through much earlier in the day and with some speed too. The last day or two models really slowed down the arrival and fropa speed. The slow speed is definitely playing out tonight, which is a likely due to a deeper surface low off the coast with a large occluded front. The latest WPC surface analysis is rather interesting and shows the complex set up currently off the West Coast. Rainfall amounts thus far with the front have been highest over the North Bay coastal mountains at over 2" and counting. North Bay Valley locations are less, but still a few tenths to nearly 1". South of the Golden Gate has generally been a few hundredths to a few tenths, which makes sense since the front is still moving S and E. The lower amounts to the south are also likely due to the fact the front is weakening slightly as it progress S and E.

Two other items of note this evening are lightning and wind. Off the coast behind the front and east the main low is an area of instability. GLM and other lightning detection networks have been picking up a decent amount of lightning the last 6-12 hours. Satellite derived instability puts that region in an area of 200-400 j/kg CAPE. Winds have been strong over the coastal waters, coastline and higher terrain since this morning. Highest gusts have been 50-70 mph this far.

For the rest of the evening and into Saturday - the front will continue to move S and E with rain and gusty winds. As the 00Z models begin to roll in they show the front eventually weakening and falling apart as it moves S and E by 09-12Z Saturday. Quick on its heels will be another area of instability and a developing second cold front as the upstream low moves eastward. This secondary cold front has more instability associated with and has a higher likelihood for thunder over the Bay Area on Saturday. MOS guidance gives the North Bay 40-50% chc of thunder, which is pretty decent. SPC also has much of the area in general mention of thunder on Saturday. Therefore will leave the Flash Flood Watch out for now as the next pulse of instability may arrive by Saturday morning. If anything the next shift may need to extend the watch if the offshore lighting holds together through Saturday afternoon. Will also leave the Wind Advisory up for now as well. As the front falls apart winds will weaken and the advisory could be canceled early.

No updates to the forecast are being made this evening as wet and windy weather continues.

PREV DISCUSSION. as of 1:30 PM PST Friday . The approaching storm system continues to slowly near the coast. The low center is now about 550 miles west off Cape Mendocino, with the associated frontal band nearing the North Coast. Latest computer models bring the first frontal band into Sonoma County just after 00Z (4 PM PST), holding off rain in San Francisco until after 7 PM. The bulk of the rainfall with this first wave is forecast to fall in the North Bay, and to a lesser extent, the Santa Cruz Mountains. A second front will sweep through the entire district on Saturday and will bring more rainfall to the area through Saturday evening, along with a slight chance of thunderstorms with small hail possible. The upper low will then finally move south along the coast on Sunday keeping showers going in its vicinity as it exits the area Sunday night. Latest storm-total rainfall estimates still show some 3-4 inch maxes for the North Bay hills with 1.5-3 inches for the Santa Cruz/Santa Lucia mtns. Rain shadowed Santa Salinas Valley 0.25-0.50 on average with 0.50-1.00 inch elsewhere through Sunday night.

The Flash Flood watch for the Kincade burn area still looks valid with all models showing a bullseye of qpf in that area and the front strongest as it moves through northern Sonoma county this evening. Will need to monitor any convective lines and short term rain rates that could lead to problems over the burn area.

A Wind Advisory remains in effect for all areas through Saturday morning. Strongest winds are expected along the coast and in the higher terrain. Gusty southeast winds will ramp up again during the day Saturday as the second front moves through.

Dry weather returns Monday and Tuesday with seasonable temperatures as high pressure rebuilds. A weak front may try and knock into the ridge by Wednesday with a slight chance of rain, but it looks insignificant at this time.

AVIATION. as of 10:45 PM PST Friday . Frontal system weakening as it moves through the Bay Area but is bringing light rain and MVFR cigs. A break is expected later tonight into Saturday morning behind the front. Lightning strikes associated with a second front have been detected about 150 miles off the coast. This system will arrive in the North Bay after 15Z and the Bay Area after 18Z bringing light to moderate rain that will last through Saturday night. Latest models show a 35 percent chance of tstorms in SFO Saturday afternoon so have added VCTS to Bay Area tafs.

Winds gusting to 25 kt may decrease some overnight but should pick up again with the next system. Gusts to 30-35 kt possible in heavier rains. Things should wind down Saturday night with just some scattered showers.

Vicinity of KSFO . MVFR cigs with bases 2500-3000 feet. Light rain ending after 10Z but resuming after 18Z. Possibility of a thunderstorm in the afternoon with occasional moderate rain. Winds gusting to 25-28 kt through Saturday . locally higher in heavier rains and thunderstorms. Stronger winds above the surface could cause LLWS up to 2000 ft.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR cigs with bases around 4000 ft. Light rain through 15Z with a seconds front bringing another period of light rain by Saturday evening. Gusty south to southeast winds to 20-25 kt at MRY and 30-35 kt in the Salinas Valley. Stronger winds above the surface could cause LLWS at MRY up to 2000 ft.

MARINE. as of 09:36 PM PST Friday . A pair of frontal boundaries will move through the waters from north to south over the next 24 to 36 hours bringing unsettled weather. Scattered thunderstorms have been detected over the outer waters and could move into the northern waters on Saturday. Gale force southerly winds can be expected through early Saturday before slowly decreasing.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Wind Advisory . CAZ006-505>513-516>518-528>530 Flash Flood Watch . CAZ506-507 GLW . SF Bay until 3 AM GLW . Pt Arena to Pt Reyes 0-10 nm until 3 AM GLW . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM GLW . Pigeon Pt to Pt Pinos 0-10 nm until 3 AM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 AM GLW . Pt Arena to Pigeon Pt 10-60 nm until 3 AM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 AM SCA . Mry Bay



PUBLIC FORECAST: MM/Sims AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 34 mi57 min ESE 13 G 18 55°F 54°F1014.6 hPa
LNDC1 35 mi51 min SE 11 G 15 56°F 1014.3 hPa
OBXC1 37 mi51 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi51 min SSE 9.9 G 15 55°F 1014.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi51 min SE 12 G 18 55°F 1013 hPa
ELXC1 - Elkhorn Slough Reserve, CA 40 mi84 min NNE 12 58°F 1015 hPa54°F
MLSC1 - Moss Landing, South Harbor, CA 40 mi110 min ESE 17 G 49 58°F 1015.9 hPa53°F
FTPC1 - 9414290 - San Francisco, CA 42 mi57 min SE 4.1 G 5.1 56°F 54°F1014.7 hPa
46092 - MBM1 44 mi62 min S 21 59°F 57°F1014.5 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi63 min SE 15 G 21 57°F 1014.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 46 mi57 min S 4.1 G 8 57°F 1014.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi94 min SSE 14 55°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi57 min SSE 9.9 G 15 56°F 54°F1013.9 hPa
UPBC1 47 mi51 min SSE 4.1 G 7
PCOC1 - 9415144 - Port Chicago, CA 47 mi51 min SE 5.1 G 8 56°F 53°F1014.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi57 min SE 5.1 G 7 56°F 54°F1014.4 hPa49°F
46237 - San Francisco Bar, CA (142) 48 mi39 min 54°F13 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi39 min SSE 27 G 35 58°F 57°F1014.9 hPa56°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA2 mi76 minSE 16 G 2310.00 miLight Rain59°F52°F78%1014.2 hPa
San Jose / Reid / Hillv, CA5 mi3.4 hrsSSE 9 G 1710.00 miMostly Cloudy61°F48°F63%1015.2 hPa
Palo Alto Airport, CA14 mi4.4 hrsSSE 16 G 2310.00 miHeavy Rain57°F50°F77%1014.6 hPa
San Carlos Airport, CA21 mi4.4 hrsSE 116.00 miLight Rain57°F53°F88%1014.6 hPa
Hayward, Hayward Air Terminal, CA23 mi75 minSSE 107.00 miLight Rain56°F52°F87%1015.5 hPa
Livermore, Livermore Municipal Airport, CA23 mi76 minVar 310.00 miLight Rain56°F51°F84%1013.8 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrCalmS4SW5SE10SE10S5S55SE14SE15SE17SE12
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmSW33SE9SW4SW7SW12SW10S3CalmCalmCalmSW9S4CalmSE3E4
2 days agoNW6NE5SW5CalmCalmW4CalmNW3CalmCalmSW3W4W5NW3NW3W4W3NW3CalmCalmSE3E4SW3E4

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Sat -- 02:31 AM PST     Moonset
Sat -- 03:47 AM PST     1.70 feet Low Tide
Sat -- 07:08 AM PST     Sunrise
Sat -- 09:12 AM PST     9.29 feet High Tide
Sat -- 02:28 PM PST     Moonrise
Sat -- 04:49 PM PST     Sunset
Sat -- 05:07 PM PST     1.08 feet Low Tide
Sat -- 10:04 PM PST     6.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.73.62.51.91.72.64.46.58.39.39.18.375.43.72.41.41.11.62.94.76.26.86.6

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 -- 01:09 AM PST     -0.73 knots Max Ebb
Sat -- 02:32 AM PST     Moonset
Sat -- 03:37 AM PST     0.00 knots Slack
Sat -- 06:20 AM PST     1.07 knots Max Flood
Sat -- 07:09 AM PST     Sunrise
Sat -- 09:23 AM PST     -0.00 knots Slack
Sat -- 01:45 PM PST     -1.01 knots Max Ebb
Sat -- 02:28 PM PST     Moonrise
Sat -- 04:35 PM PST     0.00 knots Slack
Sat -- 04:49 PM PST     Sunset
Sat -- 07:10 PM PST     1.01 knots Max Flood
Sat -- 10:07 PM PST     -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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-0.7-0.7-0.6-0.30.20.81.110.80.3-0.2-0.6-0.8-1-1-0.8-0.40.30.810.90.60.1-0.3

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 (4,6,7,8)
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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 numerious 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.