Thursday, April2, 2020
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Marine Weather and Tides
San Francisco, 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 6:50AMSunset 7:35PM Thursday April 2, 2020 12:16 PM PDT (19:16 UTC) Moonrise 12:25PMMoonset 2:32AM Illumination 73% 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 854 Am Pdt Thu Apr 2 2020
.small craft advisory in effect from 3 pm pdt this afternoon through this evening...
Today..NW winds 5 to 15 kt increasing to 15 to 25 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Fri..W winds 5 to 10 kt.
Fri night..W winds 10 to 20 kt with gusts up to 25 kt.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt. Rain likely.
Sat night..SW winds 10 to 20 kt with gusts up to 25 kt. Rain likely.
Sun..SW winds 5 to 15 kt. Rain.
Mon..SW winds up to 10 kt. Rain likely.
PZZ500 854 Am Pdt Thu Apr 2 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds expected across the coastal waters today. Occasional gale force gusts are possible through tonight and into Friday. These winds will produce fresh and steep wind- generated waves, creating hazardous conditions for smaller vessels. Winds will begin to subside late Friday and into the weekend. A moderate, predominately winds driven, northwesterly swell will prevail through Friday then gradually subside over the weekend.


7 Day Forecast for Marine Location Near San Francisco, CA
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location: 37.81, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 021733 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1033 AM PDT Thu Apr 2 2020

SYNOPSIS. Sunny and mild today with highs in the 60s. Seasonably cool overnight with the coldest valleys still falling into the 30s Friday morning followed by another sunny and mild Friday afternoon. Rain develops in the North Bay Saturday morning and then spreads over the Bay Area Saturday afternoon with rain reaching the Central Coast by late afternoon/evening. A second system drops down the coast by early Sunday morning with another round of rain, isolated thunderstorms and gusty winds Sunday. Showers linger into Monday as the low slowly drops towards Southern California by Tuesday. More noted warming and drying develops by mid to late week.

DISCUSSION. as of 08:50 AM PDT Thursday . A cool air mass has settled into the region which allowed temperatures to fall to 3 to 9 degrees below normal overnight/morning lows over the last 12 hours. Overnight frost and fog development was limited by weak winds mixing the lowest levels of the surface, however, a few reports of frost did come in from wind sheltered portions of the inland East Bay. For tonight, expect similar but marginally warmer overnight lows, with data pushing temperatures up by a single degree or two versus last nights temperatures.

Today is expected to remain mostly clear with highs in the 60s for most urban areas (locally into the 50s for cooler spots). These temperatures are near to slightly below normal afternoon temperatures,a 1-2 degree jump over yesterday. Breezy northwest winds will pick up again along the coast into the afternoon and evening hours albeit slightly weaker than yesterdays winds as the northerly gradient weakens. Similar conditions can be expected for tomorrow though with increasing high clouds from the northwest ahead of a pair of storm systems anticipated to impact the region throughout the weekend.

For the weekend, a pair of storm systems will bring unsettled weather throughout the weekend. The first of these systems will be the weaker of the two, featuring a more tightly bound 542dm 500mb upper low skirting across extreme NW California. The frontal boundary ahead of the parent upper low will bring showers first to the North Bay throughout the morning Saturday, before shifting focus to the SF Bay Area around midday, and eventually weakening before shifting farther southward towards the Central Coast by the evening. Lingering isolated showers will persist overnight before the arrival of the next storm system early Sunday, a broader, more organized 530-535dm 500mb upper low. This storm system is anticipated to bring approximately twice as much precipitation as the first storm system, with a cooler, more unstable air mass arriving with it. The post frontal instability will allow for the deeper development of convection and with that, the possibility of hail and even thunderstorms. Snow levels will also drop in the post frontal environment, allowing for a dusting of snow amongst the highest peaks across the forecast region (and much more over the Sierra -- check out NWS Sacramento or NWS Reno for the Tahoe forecast). Lingering showers near the core of the parent low will persist through Sunday night and into early next week as it the low slides down the California coast.

See previous discussion for more details on the current forecast package. No forecast updates are planned for this morning. Next forecast will be issued early this afternoon.

PREVIOUS DISCUSSION. as of 3:15 AM PDT Thursday . Skies are mostly clear this morning with a strong 6.5 mb northerly gradient down the coast. This is keeping the atmosphere fairly well mixed so far tonight with temps currently running in the 40s to around 50 regionwide. Some of the hill locations are reporting northeast wind gusts to around 20 mph with the dry northerly flow keeping skies mostly clear. This will set the stage for a sunny and mild Thursday with highs warming into the mid and upper 60s, aided by some downslope winds across the North and East Bay this morning before winds turn more onshore later this afternoon.

One more clear and cool night with some of the interior valleys dropping into the mid/upper 30s but most areas staying in the 40s once again for Friday morning. Friday will remain dry with some increasing clouds ahead of the weekend system. Increasing onshore winds will knock temperatures down a few degrees but low to mid 60s should prevail.

Main weather focus is then on a wet Bay Area weekend. Models have slightly slowed the onset of rain Saturday morning. Its interesting to watch the models resolve the two shortwaves, currently up in the Gulf of Alaska and Aleutian Islands. The lead shortwave will reach the North Bay by Saturday morning with rain gradually spreading over the Bay Area Saturday afternoon. Per usual, the front will weaken as it reaches the Santa Clara Valley with just some light rain for the South Bay and Monterey Bay region by later Saturday afternoon/evening. Rain totals by Saturday evening look to be 0.25-0.50 for the North Bay, 0.25 Bay Area and tenth or so for the South Bay/Monterey Bay region (locally higher Santa Lucias).

The second shortwave will drop down the coast by early Sunday morning. The two systems will do a little Fujiwhara dance and there wont be much of a break as steady rain redevelops across the region by Sunday morning. An incoming jet streak will provide good diffluence aloft with cold air aloft allowing for steep lapse rates with a fairly well defined surface boundary. By Sunday afternoon showers and or isolated thunderstorms with small hail will be likely as snow levels drop to around 3500 feet. Will say that latest model solutions keep the coldest pool farther offshore so snow levels look slightly higher than they did 24 hours ago. The position of the upper low and cold air aloft sets the stage for some likely strong t-storm activity in the Central Valley with potentially interesting shear profiles due to strong low level wind flow driven by the topography in combination with increasingly strong April sun angle to help with afternoon destabilization. Still too far out for finer details but limiting factor for strong storms in our CWA on Sunday may be extensive cloud cover.

Shower activity will last Sunday night into Monday as the core of the upper low passes over the region with isolated t-storm threat continuing. Latest qpf forecasts from Saturday through Monday suggest 0.50-1.00 on average for most of the Bay Area with 1-2 inch totals for the favored hills of coastal Sonoma/Santa Cruz mtns and Santa Lucia range. Similar to the previous cold core systems in late March the more likely scenario is for this system to over perform in terms of final rainfall totals.

Low will be slow to exit the region with showers possibly persisting for the Central Coast thru Tuesday. High pressure slowly builds midweek and beyond with gradual warming and drying trend. Extended model trends indicate at least more light rain chances should continue through mid-month behind the late week ridge. Not nearly enough to make up for the February deficits but welcome rain nonetheless that at the very least delays the start of fire season, puts some extra snowpack in the Sierra and some more water in the reservoirs.

AVIATION. as of 10:33 AM PDT Thursday . For 18Z TAFs. Clear skies will prevail across the region today. North to northwesterly winds this morning will shift a bit more westerly and strengthen this afternoon, becoming gusty at the wind-prone terminals.

Vicinity of KSFO . VFR conditions will prevail through the forecast period under mostly clear skies. Light winds this morning will increase out of the west/northwest through the day, becoming breezy by the afternoon. Sustained winds of 15-20 kt with gusts to around 25 kt expected, particularly at SFO.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions will prevail through the forecast period under mostly clear skies. Light winds this morning will become west/northwest this afternoon around 12-15 kt with gusts to around 20 kt.

MARINE. as of 8:54 AM PDT Thursday . Moderate northwesterly winds expected across the coastal waters today. Occasional gale force gusts are possible through tonight and into Friday. These winds will produce fresh and steep wind- generated waves, creating hazardous conditions for smaller vessels. Winds will begin to subside late Friday and into the weekend. A moderate, predominately winds driven, northwesterly swell will prevail through Friday then gradually subside over the weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 1 PM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 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 SCA . Mry Bay from 3 PM SCA . SF Bay from 3 PM



PUBLIC FORECAST: DRP AVIATION: CW MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi268 min 59°F
PXSC1 2 mi268 min 52°F 41°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi268 min W 2.9 G 5.1 51°F 1018.2 hPa
OBXC1 5 mi268 min 50°F 40°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi274 min N 8.9 G 9.9
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi258 min N 1.9 52°F 1019 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi268 min N 8.9 G 11 50°F 1019.2 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi268 min N 6 G 8 50°F 59°F1019.1 hPa
LNDC1 8 mi268 min N 5.1 G 8.9 50°F 1019 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi268 min NNW 6 G 6 50°F 56°F1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi268 min NNW 1 G 2.9 51°F 1019.6 hPa
46237 - San Francisco Bar, CA (142) 10 mi256 min 53°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi268 min W 2.9 G 5.1 50°F 1019.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi246 min NNW 16 G 18 50°F 53°F1019.9 hPa
UPBC1 23 mi268 min WNW 1.9 G 2.9
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi268 min Calm G 1.9 48°F 57°F1019.3 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi268 min S 1 G 1 48°F 60°F1019.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi268 min S 5.1 G 8 45°F 58°F1018.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi274 min NNW 9.9 G 15 53°F 1018.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi331 min SSE 2.9
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi246 min NNW 19 G 23 51°F 55°F1019.8 hPa44°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA14 mi23 minWNW 1310.00 miFair62°F34°F35%1019.5 hPa
San Francisco, San Francisco International Airport, CA14 mi20 minN 710.00 miFair61°F33°F35%1019.4 hPa
Hayward, Hayward Air Terminal, CA20 mi22 minW 1010.00 miFair59°F34°F39%1020.3 hPa
Half Moon Bay Airport, CA21 mi21 minNW 1510.00 miFair55°F41°F59%1020 hPa
San Carlos Airport, CA22 mi28 minNW 710.00 miClear57°F28°F33%1020 hPa
Concord, Buchanan Field, CA24 mi23 minNW 410.00 miFair62°F28°F29%1017.8 hPa
Novato / Gnoss Field, CA24 mi41 minNW 710.00 miFair61°F33°F36%1020 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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2 days agoE6NE3W10W12W14W14W13W11W6SW4W4W3SW4SW3CalmNW3W5NW6CalmS4CalmW3E3E5

Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Thu -- 12:56 AM PDT     3.22 feet Low Tide
Thu -- 03:32 AM PDT     Moonset
Thu -- 06:37 AM PDT     5.13 feet High Tide
Thu -- 06:52 AM PDT     Sunrise
Thu -- 01:25 PM PDT     Moonrise
Thu -- 01:46 PM PDT     -0.03 feet Low Tide
Thu -- 07:34 PM PDT     Sunset
Thu -- 09:26 PM PDT     4.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.33.23.43.74.24.75.15.14.73.92.81.70.70.1-00.30.91.72.53.44.14.44.44

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Thu -- 02:57 AM PDT     0.00 knots Slack
Thu -- 03:32 AM PDT     Moonset
Thu -- 05:48 AM PDT     0.78 knots Max Flood
Thu -- 06:52 AM PDT     Sunrise
Thu -- 08:16 AM PDT     -0.00 knots Slack
Thu -- 11:39 AM PDT     -2.26 knots Max Ebb
Thu -- 01:25 PM PDT     Moonrise
Thu -- 03:46 PM PDT     0.00 knots Slack
Thu -- 07:11 PM PDT     1.53 knots Max Flood
Thu -- 07:34 PM PDT     Sunset
Thu -- 10:22 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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-0.8-0.6-0.400.40.70.80.60.2-0.6-1.5-2.1-2.2-1.9-1.3-0.70.20.91.31.51.410.3-0.6

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 (15,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.