Monday, April6, 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 6:46AMSunset 7:37PM Sunday April 5, 2020 9:52 PM PDT (04:52 UTC) Moonrise 3:59PMMoonset 4:41AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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- 922 Pm Pdt Sun Apr 5 2020
Tonight..NW winds up to 10 kt. A chance of showers.
Mon..N winds up to 10 kt. Showers likely.
Mon night..E winds 10 to 20 kt with gusts up to 25 kt. A slight chance of showers.
Tue..N winds up to 10 kt. A slight chance of showers.
Tue night..W winds 5 to 15 kt.
Wed..W winds 5 to 10 kt.
Wed night..SW winds 5 to 10 kt.
Thu..SW winds 5 to 10 kt.
Fri..SW winds 5 to 10 kt.
PZZ500 922 Pm Pdt Sun Apr 5 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1002 mb low centered just west of crescent city will drop south along the coastal waters tonight and Monday. Showers associated with this low will end from the north Monday night. Winds will become light to moderate northwesterly on Tuesday as high pressure builds off the pacific northwest. A prevailing moderate west to northwest swell will persist through much of the forecast period.


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 060419 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 919 PM PDT Sun Apr 5 2020

SYNOPSIS. Rain will taper off across the southern portion of the area this evening, but showers will remain possible through the night. Shower activity will increase once again on Monday, especially south of San Francisco, as an upper low moves south near the Central Coast. There is also a chance of thunderstorms on Monday. Showers may linger across the Central Coast into Tuesday, and possibly Wednesday, as the upper low slowly exits the region. A warming and drying trend is forecast for the second half of the week.

DISCUSSION. As of 9:15 PM PDT Sunday . A strong late season frontal system produced widespread beneficial rain across our forecast area today. In a reversal from yesterday when the highest rain totals were across the North Bay, today's heaviest rainfall was farther south across Santa Cruz County, southern Santa Clara County, and western Monterey County. 24 hour rainfall totals in the Santa Cruz Mountains ranged from 3-5 inches. Similar totals have thus far been reported in the Santa Lucia Mountains and it's still raining there. Near sea level, the Watsonville Airport picked up 2.82" of rain over the past 24 hours, which is more than double that location's average rain total for the entire month of April. Rivers and creeks were running low enough prior to this rain event to handle today's runoff with mostly just moderate rises. Most of the smaller rivers and streams have already begun to subside, except the Big Sur River which is still rising as widespread rain continues to fall across that basin. Will monitor the river stage on the Big Sur closely for the remainder of the evening, but if rainfall tapers off over the next few hours as forecast, flooding issues will be avoided.

The reason for the large rain totals across Santa Cruz and Monterey County today is that a wave developed along the front offshore late this afternoon, causing the frontal boundary to stall across the Monterey Bay Area for several hours. The front has only recently begun to move off to the southeast and latest short-term models indicate the boundary will pick up speed late this evening and exit our area shortly after midnight. Widely scattered showers will continue after midnight, but most areas will get a short break from rain for most of the night.

Current satellite imagery shows two circulation centers off the California coast, as two vorticity centers dumbbell around an upper low. The southern vort center is forecast to approach the northern Monterey County Coast on Monday morning which will result in renewed widespread shower activity. Shower activity will primarily be located over the southern half of our forecast area on Monday morning and then shift northward into the SF Bay Area during the afternoon (mainly south of Sonoma and Napa Counties). Also, isolated thunderstorms are possible on Monday as the cold airmass aloft associated with the upper low spreads overhead and 500 mb temps drop to minus 30 deg C. In addition, snow levels are forecast to decrease to 3000-3500 feet by late tonight and Monday morning. This will likely result in snowfall accumulation across our higher mountains, especially in the Santa Lucias where up to 6 inches of snow may accumulate above 4000 feet by Monday afternoon. Snow accumulation is also likely on the higher peaks of the Diablo Range, such as Mount Hamilton, with perhaps even a dusting of snow on the highest peaks of the Santa Cruz Mountains.

Shower activity will decrease on Monday night as the upper low slowly moves southward off Point Conception. But then the second vort center is forecast to rotate across the southern half of our forecast area on Tuesday and trigger another round of scattered showers. Most areas will begin to dry out by Wednesday as the upper low moves inland near San Diego, although a few showers may linger over the far southern part of our area.

Dry and mild weather conditions are forecast from Thursday through next weekend as an upper ridge develops off the West Coast.

AVIATION. as of 5:00 PM PDT Sunday . Strong winds have not materialized and thunderstorms have been confined to the central Valley. These elements have been removed from the tafs.

Most of the rain is from KSJC south. Abundant moisture at the lower levels will keep borderline MVFR/VFR cigs over the entire area through tonight with patchy fog in the North Bay late tonight. Upper level low will drop south along the central coast. Winds will become more southerly after midnight but remain 10 kt or less. A band of showers from the low is expected to come onshore in the MRY Bay Area after 12Z spreading into the Santa Clara Valley after 16Z and the rest of the Bay Area after 21Z.

Vicinity of KSFO . MVFR cigs at times with bases around 3000 ft. West to southwest winds to 10 kt becoming southeast Monday morning. Showers expected to return after 20Z as winds switch back to westerly.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Light to moderate rain through early evening. MVFR cigs becoming more widespread tonight as the low levels are very moist. A short lull in the rain tonight before the next band of showers arrives after 12Z and persists through the afternoon.

MARINE. as of 04:53 PM PDT Sunday . Moderate to heavy showers will persist the rest of today along with a slight chance of thunderstorms, mainly over the southern waters. This will also result in locally breezy west to southwest winds across portions of the coastal waters into this evening before winds diminish tonight. The upper low will slowly exit the area into Tuesday before high pressure rebuilds over the eastern Pacific mid to late next week. A prevailing moderate west to northwest swell will persist through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 PM



PUBLIC FORECAST: Dykema AVIATION: W Pi MARINE: AS

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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 mi53 min WSW 2.9 G 5.1 51°F 60°F1006.6 hPa (+0.9)
AAMC1 - 9414750 - Alameda, CA 13 mi53 min WNW 5.1 G 8.9 51°F 58°F1006.2 hPa (+0.9)
LNDC1 14 mi53 min WNW 5.1 G 7 52°F 1006.1 hPa (+0.9)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi53 min WNW 8 G 11
OBXC1 15 mi53 min 53°F 42°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi53 min NW 7 G 9.9 52°F 1006.2 hPa (+1.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi53 min W 5.1 G 8 51°F 1005.2 hPa (+1.0)
PXSC1 15 mi53 min 52°F 43°F
FTPC1 - 9414290 - San Francisco, CA 17 mi53 min 59°F
46237 - San Francisco Bar, CA (142) 22 mi53 min 55°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi49 min Calm 48°F 1006 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi53 min WNW 6 G 8.9 53°F 1006.4 hPa (+1.1)
RCMC1 - 9414863 - Richmond, CA 24 mi53 min WNW 7 G 8.9 52°F 57°F1005.8 hPa (+1.1)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi23 min NNW 5.8 G 9.7 51°F 53°F1006.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi53 min WNW 12 G 15 52°F 1005.6 hPa (+1.2)
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi53 min NW 9.9 G 11 51°F 58°F1005.9 hPa (+1.1)
UPBC1 33 mi53 min NW 8 G 13
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi23 min NW 7.8 G 9.7 52°F 54°F1006.7 hPa42°F
PCOC1 - 9415144 - Port Chicago, CA 35 mi53 min W 8.9 G 12 52°F 58°F1005.7 hPa (+1.2)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi53 min W 5.1 G 7 51°F 1005.8 hPa (+1.0)
SFXC1 - San Francisco Bay Reserve, CA 45 mi68 min WNW 5.1

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 mi57 minNW 810.00 miMostly Cloudy52°F41°F66%1005.9 hPa
San Carlos Airport, CA5 mi2 hrsSW 510.00 miMostly Cloudy50°F42°F76%1005.8 hPa
Oakland, Metro Oakland International Airport, CA9 mi60 minWNW 810.00 miOvercast53°F42°F66%1006.1 hPa
Hayward, Hayward Air Terminal, CA11 mi59 minW 610.00 miMostly Cloudy51°F41°F69%1007 hPa
Half Moon Bay Airport, CA11 mi58 minNW 510.00 miMostly Cloudy50°F41°F71%1006.1 hPa
Palo Alto Airport, CA13 mi66 minVar 410.00 miMostly Cloudy50°F46°F88%1006.4 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Mon -- 05:46 AM PDT     0.86 feet Low Tide
Mon -- 06:16 AM PDT     Moonset
Mon -- 06:46 AM PDT     Sunrise
Mon -- 11:44 AM PDT     7.40 feet High Tide
Mon -- 06:09 PM PDT     -0.34 feet Low Tide
Mon -- 06:13 PM PDT     Moonrise
Mon -- 07:37 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.16.65.33.72.21.10.91.62.94.66.17.17.46.75.23.41.60.3-0.301.234.86.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Mon -- 12:52 AM PDT     -0.01 knots Slack
Mon -- 03:53 AM PDT     -1.60 knots Max Ebb
Mon -- 06:16 AM PDT     Moonset
Mon -- 06:46 AM PDT     Sunrise
Mon -- 06:50 AM PDT     0.00 knots Slack
Mon -- 09:34 AM PDT     1.96 knots Max Flood
Mon -- 12:52 PM PDT     -0.01 knots Slack
Mon -- 04:10 PM PDT     -1.97 knots Max Ebb
Mon -- 06:12 PM PDT     Moonrise
Mon -- 07:17 PM PDT     0.01 knots Slack
Mon -- 07:36 PM PDT     Sunset
Mon -- 10:04 PM PDT     2.18 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.9-0.1-0.9-1.5-1.6-1.3-0.70.21.21.91.91.60.9-0.1-1-1.7-2-1.8-1.2-0.30.81.82.22

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 (0,6,7,8)
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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.