Friday, April3, 2020
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Marine Weather and Tides
Moraga, 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 6:48AMSunset 7:35PM Friday April 3, 2020 7:40 PM PDT (02:40 UTC) Moonrise 1:32PMMoonset 3:19AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 218 Pm Pdt Fri Apr 3 2020
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 10 to 20 kt with gusts up to 25 kt, diminishing to 5 to 10 kt after midnight.
Sat..SW winds up to 10 kt. Rain.
Sat night..S winds 5 to 10 kt. Rain likely.
Sun..S winds 5 to 15 kt with gusts up to 25 kt. Rain.
Sun night..SW winds 5 to 10 kt. Rain likely.
Mon..S winds up to 10 kt. A chance of rain.
Mon night..NW winds up to 10 kt.
Tue..W winds up to 10 kt.
Wed..W winds up to 10 kt.
PZZ500 218 Pm Pdt Fri Apr 3 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong northwest winds will generate fresh and steep wind waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the gulf of alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.


7 Day Forecast for Marine Location Near Moraga, CA
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location: 37.8, -122.12     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 032346 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 446 PM PDT Fri Apr 3 2020

SYNOPSIS. Light rain develops in the North Bay Saturday morning spreading across the Bay Area Saturday afternoon and evening. A second system drops down the coast Sunday keeping a steady rain going for much of the day across the region. Precipitation becomes more showery Sunday night into Monday as the upper low drops down the coast. The parent low will cut-off over Southern California keeping temperatures below normal and the chance of showers in the forecast through midweek.

DISCUSSION. as of 3:00 PM PDT Friday . Another nice if not slightly cool day across the region today with mostly clear skies and light to locally breezy onshore winds. Afternoon temperatures are running a few degrees short of yesterdays temperatures as a cooler, moister air mass begins to advect into the region from the northwest. The synoptic scale pattern shows a weakening high pressure wave over the area today that has promoted these fair weather conditions. Meanwhile, farther upstream, a pair of upper level low pressure systems are digging southward from the Gulf of Alaska and are forecast to an extended period of unsettled weather to the region over the next several days. An increase in high level clouds ahead of the first of these two storm systems is expected through the remainder of today.

The first of the two storm systems will be weaker in all measures but will control the narrative on Saturday. Models agree that the storm system will impact the North Bay first, arriving prior to or during the sunrise hours tomorrow morning. Light to locally moderate rainfall will spread southward and shift into the immediate San Francisco Bay shoreline area by mid to late tomorrow morning, while lighter rain persists in the North Bay. Next, the cold front will shift over the South Bay and Santa Cruz mountains by the early afternoon where it is expected to slow down and fizzle out. A few weaker rain showers from the fragmented front could drop into the Central Coast by the late afternoon to early evening, however, the frontal activity is expected to drop off significantly at this point as the upper parent low reverses course and ejects into Oregon. That said, the post frontal air mass will be sufficiently unstable to kick off scattered to widespread weak rain showers across greater San Francisco Bay Area throughout Saturday evening and into Saturday night. Saturday precipitation totals will be most favorable for the North Bay with 0.33"-0.50" for the valleys and 0.75-1.50" for the North Bay coastal ranges. The Santa Cruz mountains and San Mateo coastal ranges will see roughly 0.50 to 0.66" on Saturday. Meanwhile, lesser amounts are expected for the urban portions of the immediate San Francisco shoreline, with 0.15-0.40" for the San Francisco and Oakland metro areas. The San Jose area will be rain shadowed and also experience a weaker cold front than San Francisco/Oakland and is expected to receive 0.05-0.25" on Saturday. Given the weak nature of Saturdays frontal boundary, winds are not expected to be major impact, with generally only occasionally breezy to infrequently gusty southerly winds expected.

That said, our local WRF (one of our preferred short term models for fine scale weather features) and the national NAM have picked up on the potential for frontogenesis occurring along the stalled out frontal boundary overnight Saturday as the stronger Sunday begins to take control over the region. Consequently, some of the strongest winds are forecast to develop to the south of this redeveloping frontal boundary with sustained winds up to 30mph and gusts up to 50mph possible along portions of the southern Monterey Bay and Big Sur coast. As a result, a wind advisory has been issued and is in effect from 5am to 5pm Sunday, however, we are anticipating the strong winds midday Sunday (lunch hours) when a different well defined cold frontal boundary arrives from the north. In addition, a training line of possibly enhanced showers along this boundary will bring an extended period of moderate to occasionally heavy rainfall over the Santa Cruz mountains beginning around 5am Sunday morning and persisting throughout Sunday. As a result, we could see localized issues with excess rainfall there, with upwards targets of 5 to 6 inches of rain there possible over a 24 hour period. This may lead to issues with rock slides or downed trees (in conjunction with the wind) across the Santa Cruz mountains on Sunday. Please provide extra time to make it to your destination if you must travel through the Santa Cruz mountains on Sunday.

Next, a second well defined cold frontal boundary will arrive in the North Bay late Sunday morning to early Sunday afternoon. Convective enhancement with this line is possible and we could see what we refer to as a NICFR (narrow intense cold frontal rain band) develop as this well defined air mass boundary sweeps across the region during Sunday afternoon and evening. This rain band will bring the most intense rain rates and gusty pre frontal southerly winds to a broad portion of the region throughout Sunday. Total rain accumulations from the Sunday system are expected to be roughly 2 to 3 times higher than the Saturday system, depending on location. In addition, the strongest winds expected over the course of the weekend are anticipated to occur as this cold front overruns the nearly stationary boundary expected to bring steady rain to the Santa Cruz mountains. These strongest winds, as previously discussed, are expected to occur across the southern Monterey Bay and Big Sur coast midday Sunday. A period of fewer showers may prevail late Sunday evening into Sunday night before the coldest, most unstable air associated with the core of the upper low begins to impact the region throughout Monday. CAPE values of 200-400J/kg with negative lifted indices of 2 to 4C indicate some potential of convective instability in the wake of the well defined cold front that arrived Sunday. Consequently, a mention of widspread showers and isolated thunderstorms with frequent accumulations of small hail should be anticipated throughout Monday. In addition, latest model runs also show air mass temps of -10C at 700mb over the region Monday and into Tuesday, which as a rule of thumb tends to translates to snow levels around 3500 ft, meaning some of the tallest peaks across the region could see a dusting of snow with the post frontal showers early next week. Overnight lows Monday and Tuesday night will drop into the 30s once again for the inland valley locations such as Santa Rosa.

Models generally agree that the Sunday system will slowly wobble down the California coastline throughout an extended period from Sunday through as late as Thursday of next week. As a result, an extended period of unsettled weather and lingering rains showers should be anticipated through the next 5 to 7 days.

Generally speaking, a majority of this precipitation is expected to beneficial, however, there are a few potential hazards as well. First is the potential for excessive rainfall over the Santa Cruz mountains throughout Sunday. Second is the potential for gusty south winds along the Monterey and Big Sur coasts. Finally, the last impact would be from accumulations of hail on roadways from thunderstorms on Monday which can emulate driving on ice. For those interested in the Sierra/Tahoe forecast, check out the Winter Storm Warning/Winter Storm Watch products from NWS Reno, Sacramento, or Hanford.

AVIATION. as of 4:42 PM PDT Friday . For 00Z TAFs. Mostly clear skies and VFR conditions across the Bay Area and Central Coast this afternoon, which will continue into the evening. Winds remain onshore and breezy, with stronger gusts observed closer to the coastline. A few clouds from the approaching system pass periodically. That system coming in from the northwest will bring rain and cloud cover to the area, traveling north to south, beginning as early as 12Z in the North Bay. Winds will predominantly from the northwest through the TAF period, but a shift to the south-southwest with stronger gusts is forecast as the front pushes through.

Vicinity of KSFO . VFR with onshore winds providing stronger gusts. Clouds increase tonight as the next weather system approaches Saturday, cloud ceilings lowering to MVFR by 14z Saturday with light rain developing. Rain continues through most of the TAF period. Winds will back off slightly overnight, but strengthen once again in the afternoon. Expect a brief period for winds to shift to the southwest as the front moves through.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Winds remain onshore with stronger gusts. Clouds will increase overnight lowering cigs to MVFR by 17z Saturday. Light rain will move toward the peninsula in the afternoon on Saturday. Winds will ease overnight, but restrengthen and be onshore on Saturday, with stronger gusts possible, particularly near the coast.

MARINE. as of 02:18 PM PDT Friday . Strong northwest winds will generate fresh and steep wind waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the Gulf of Alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Mry Bay until 12 AM SCA . Pt Arena to Pt Reyes 0-10 nm until 12 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 12 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 12 AM SCA . Pt Arena to Pigeon Pt 10-60 nm until 12 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 12 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . SF Bay until 9 PM



PUBLIC FORECAST: DRP AVIATION: DK MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 9 mi52 min W 5.1 G 8.9 57°F 1015 hPa
AAMC1 - 9414750 - Alameda, CA 10 mi52 min W 8.9 G 13 55°F 62°F1015.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi52 min W 9.9 G 13 55°F 1015 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi58 min W 13 G 18
OBXC1 12 mi52 min 55°F 44°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi52 min W 8.9 G 15 54°F 1014.1 hPa
PXSC1 15 mi52 min 55°F 43°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 15 mi52 min NW 14 G 21 57°F 1015.1 hPa
UPBC1 16 mi52 min WNW 15 G 18
MZXC1 - 9415102 - Martinez-Amorco CA 16 mi52 min W 13 G 16 57°F 59°F1014.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 18 mi42 min NNW 9.9 54°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi52 min NW 12 G 18 55°F 58°F1014.7 hPa
PCOC1 - 9415144 - Port Chicago, CA 18 mi52 min W 14 G 16 58°F 60°F1013.9 hPa
FTPC1 - 9414290 - San Francisco, CA 18 mi52 min 60°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi52 min WNW 9.9 G 16 57°F 1014.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi58 min WNW 12 G 16 60°F 1013.6 hPa
RTYC1 - 9414523 - Redwood City, CA 21 mi52 min W 13 G 18 53°F 61°F1016.5 hPa
46237 - San Francisco Bar, CA (142) 27 mi40 min 55°F7 ft
SFXC1 - San Francisco Bay Reserve, CA 28 mi115 min W 12
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi40 min NW 21 G 27 51°F 52°F1016.6 hPa (-1.1)

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA9 mi47 minW 1510.00 miA Few Clouds58°F42°F56%1015.4 hPa
Hayward, Hayward Air Terminal, CA10 mi46 minW 1210.00 miFair54°F41°F62%1016.5 hPa
Concord, Buchanan Field, CA13 mi47 minWSW 810.00 miFair61°F37°F41%1012.9 hPa
Livermore, Livermore Municipal Airport, CA17 mi47 minW 810.00 miFair56°F39°F53%1014.4 hPa
San Francisco, San Francisco International Airport, CA18 mi44 minW 20 G 3210.00 miA Few Clouds and Breezy52°F41°F66%1015.6 hPa
San Carlos Airport, CA20 mi53 minW 1010.00 miA Few Clouds54°F41°F63%1016.3 hPa
Palo Alto Airport, CA22 mi53 minWNW 1410.00 miClear54°F39°F58%1015.9 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrW13W12NW6W5W6CalmNE4CalmCalmCalmNE3N4CalmCalmSW3W7W6SW7W7W14W15W14W14W15
1 day agoW8N5NW6NW5CalmCalmN5CalmCalmN3N4CalmCalmN5NW6NW11W13NW15W14--W15----W11
2 days agoW13W16W12W10NW7W10W9NW5NW8N3CalmN4NE4CalmNW8W55SW6W7W12W15W15W12W11

Tide / Current Tables for San Leandro Channel, San Leandro Bay, San Francisco Bay, California
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San Leandro Channel
Click for Map
Fri -- 02:58 AM PDT     2.82 feet Low Tide
Fri -- 04:19 AM PDT     Moonset
Fri -- 06:50 AM PDT     Sunrise
Fri -- 08:32 AM PDT     6.15 feet High Tide
Fri -- 02:32 PM PDT     Moonrise
Fri -- 03:35 PM PDT     -0.25 feet Low Tide
Fri -- 07:34 PM PDT     Sunset
Fri -- 10:46 PM PDT     5.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.43.632.83.13.74.65.56.16.15.64.53.11.70.5-0.1-0.20.31.22.43.64.75.45.5

Tide / Current Tables for Oakland Harbor High Street Bridge, San Francisco Bay, California Current
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Oakland Harbor High Street Bridge
Click for Map
Fri -- 03:08 AM PDT     0.00 knots Slack
Fri -- 04:19 AM PDT     Moonset
Fri -- 05:33 AM PDT     1.02 knots Max Flood
Fri -- 06:50 AM PDT     Sunrise
Fri -- 08:27 AM PDT     -0.00 knots Slack
Fri -- 11:27 AM PDT     -1.67 knots Max Ebb
Fri -- 02:32 PM PDT     Moonrise
Fri -- 03:46 PM PDT     0.00 knots Slack
Fri -- 06:39 PM PDT     1.78 knots Max Flood
Fri -- 07:34 PM PDT     Sunset
Fri -- 10:06 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.6-0.4-0.10.5110.80.3-0.4-1.1-1.6-1.6-1.4-1-0.50.21.11.71.81.50.90.1-0.7

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 (22,6,7,8)
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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.