Thursday, July16, 2020
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Marine Weather and Tides
Tamalpais-Homestead Valley, 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 5:59AMSunset 8:32PM Thursday July 16, 2020 7:39 AM PDT (14:39 UTC) Moonrise 1:35AMMoonset 4:08PM Illumination 15% Phase: Waning Crescent; Moon at 26 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- 232 Am Pdt Thu Jul 16 2020
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..SW winds 10 to 20 kt...increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt.
Sat night..SW winds 5 to 15 kt.
Sun..SW winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 232 Am Pdt Thu Jul 16 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure off of the coast will continue to bring generally light to moderate southerly flow over the waters through Friday. Meanwhile, locally stronger northwest winds will develop across the northern offshore waters Thursday night into Friday. Gusty winds will once again be possible through the golden gate and west delta Thursday afternoon. The sea state will continue a moderate southerly swell with a moderate period.


7 Day Forecast for Marine Location Near Tamalpais-Homestead Valley, CA
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location: 37.89, -122.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 161156 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 456 AM PDT Thu Jul 16 2020

SYNOPSIS. Seasonable conditions will continue across the region the next several days, with onshore flow prevailing. The marine layer will linger along the coast as well, bringing night and morning low clouds, with sunny afternoons. Some smoke and haze from the Coyote and Mineral fires may impact portions of the Bay Area and Central coast today and potentially into Friday.

DISCUSSION. As of 2:40 AM PDT Thursday . Water vapor imagery shows another trough of low pressure taking aim at the Pacific Northwest this morning, with an upper level low over the Southern California Bight. As a result, general troughiness remains along the West Coast. A relatively deep marine layer, around 2500 feet deep according to the Fort Ord profiler, also remains and is pushing into the inland coastal valleys at this time. These low clouds will linger through mid morning, then give way to mostly sunny skies and seasonal temperatures. The HRRR model continues to suggest that smoke from the Coyote and Mineral Fires may impact the region today in the form of some haze. In fact, the heat signature from the Mineral Fire is suggesting it flared up a bit during the overnight hours, so some smoke and haze is definitely not out of the question for today.

The overall upper level pattern does not change much for Friday or this weekend, as the upper level low over the Bight lifts and retrogrades off the Central Coast. The models are hinting at an upper level disturbance lifting across our region as this low retrogrades off the coast on Friday. If there was more upper level moisture associated with this disturbance, the threat of elevated convection would concern me. However, all the models are suggesting minimal moisture at 700 mbs or between 700 and 500 mbs. Therefore, thinking we will most likely be see little impact, but it will be something to watch over the next 24 to 36 hours. The models are also hinting at another disturbance lifting over the region on Sunday. Again, the moisture is so limited in the upper levels, that expect little if any impact. However, it will be something to watch. The only things that these two disturbances may do are to help deepen the marine layer even more and help trigger some drizzle for the coastal areas. Right now, expect seasonal temperatures to prevail, with only minor day to day fluctuations possible.

As we head into the new work week, expect more of the same, with seasonal conditions prevailing. Night and morning low clouds will continue as well, and onshore flow prevailing. Palmer

AVIATION. as of 04:55 AM PDT Thursday . for 12Z TAFs . A deep marine layer has resulted in widespread stratus over the most regional terminals this morning with ceilings generally between 600-1200 feet. However, far interior locations such as KSJC will likely remain VFR while KLVK may see a brief period of MVFR ceilings develop around sunrise. These low clouds will begin to dissipate between 16Z-19Z and give way to VFR conditions this afternoon along with an increase in onshore winds. Look for potentially an earlier return of stratus late this evening and into Friday morning.

Vicinity of KSFO . MVFR ceilings have developed over KSFO and will likely persist through about 16Z along with northwesterly winds generally less than 10 kt. Winds will diminish slightly and low clouds will begin to dissipate before northwesterly winds once again increase by around 20Z. With the continued wildfires in San Benito and Fresno counties (south of the Bay Area), reduced visibilities will be possible in upper levels of the atmosphere upon descent. Otherwise, VFR is forecast with breezier onshore flow this afternoon and evening. Moderate confidence of stratus return early Friday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . IFR to brief LIFR ceilings this morning with generally light and variable winds. Ceilings will likely begin to lift to MVFR around 17Z before scattering out around 19Z. Onshore winds will also being to increase to between 9-12 kt beyond 19Z and continue through the afternoon. Moderate to high confidence of lowering ceilings late this evening.

MARINE. as of 04:55 AM PDT Thursday . Low pressure off of the coast will continue to bring generally light to moderate southerly flow over the waters through Friday. Meanwhile, locally stronger northwest winds will develop across the northern offshore waters Thursday night into Friday. Gusty winds will once again be possible through the Golden Gate and West Delta Thursday afternoon. The sea state will continue a moderate southerly swell with a moderate period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 1 PM



PUBLIC FORECAST: Palmer AVIATION: RGass MARINE: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi42 min NNE 1.9 56°F 1013 hPa
46237 - San Francisco Bar, CA (142) 8 mi40 min 58°F3 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi52 min 63°F
RCMC1 - 9414863 - Richmond, CA 9 mi52 min 64°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi130 min WSW 7 G 12
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi130 min W 7 G 9.9
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi130 min W 9.9 G 11
AAMC1 - 9414750 - Alameda, CA 16 mi52 min 68°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi30 min SE 5.8 G 7.8 55°F 55°F1013.1 hPa55°F
LNDC1 17 mi130 min W 6 G 8.9
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi130 min WSW 9.9 G 13
UPBC1 26 mi130 min W 16 G 19
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi52 min 69°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi52 min 69°F
RTYC1 - 9414523 - Redwood City, CA 33 mi52 min 74°F
SFXC1 - San Francisco Bay Reserve, CA 36 mi55 min W 13
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi130 min WNW 16 G 22
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi30 min SE 5.8 G 7.8 56°F 1013.2 hPa55°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi30 min E 1.9 G 1.9 53°F 52°F1012.5 hPa53°F
46214 - Point Reyes, CA (029) 47 mi44 min 55°F5 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi45 minN 010.00 miOvercast59°F55°F88%1012.5 hPa
San Francisco, San Francisco International Airport, CA22 mi44 minNW 410.00 miOvercast59°F52°F78%1012.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi47 minWNW 610.00 miOvercast61°F54°F78%1012.5 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalm44E6634N17N13
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N114N7N8N11N11N6NW10CalmSW4CalmW3CalmCalm
1 day agoCalmCalm44E7SE8SE6SE6
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NW9CalmN12N10N11N8N8N8NW5CalmCalmCalmCalmN4NE3
2 days ago3CalmSE8SE7E8E9E9SE7SE10Calm4
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Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Thu -- 02:34 AM PDT     Moonrise
Thu -- 03:55 AM PDT     0.46 feet Low Tide
Thu -- 06:01 AM PDT     Sunrise
Thu -- 10:49 AM PDT     3.85 feet High Tide
Thu -- 03:08 PM PDT     2.85 feet Low Tide
Thu -- 05:08 PM PDT     Moonset
Thu -- 08:30 PM PDT     Sunset
Thu -- 09:13 PM PDT     5.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.32.11.20.60.50.71.21.92.63.33.73.83.73.332.833.44.14.95.55.85.75.1

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Thu -- 02:03 AM PDT     0.01 knots Slack
Thu -- 02:34 AM PDT     Moonrise
Thu -- 04:33 AM PDT     0.78 knots Max Flood
Thu -- 06:00 AM PDT     Sunrise
Thu -- 07:59 AM PDT     -0.00 knots Slack
Thu -- 11:07 AM PDT     -0.30 knots Max Ebb
Thu -- 01:39 PM PDT     0.00 knots Slack
Thu -- 03:52 PM PDT     0.62 knots Max Flood
Thu -- 05:08 PM PDT     Moonset
Thu -- 07:04 PM PDT     -0.01 knots Slack
Thu -- 08:30 PM PDT     Sunset
Thu -- 11:24 PM PDT     -0.80 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-0.4-00.50.70.80.60.4-0-0.2-0.3-0.3-0.3-0.10.10.50.60.50.30-0.2-0.5-0.7-0.8

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

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Wind Forecast for San Francisco/Monterey Bay Area, CA (10,2,3,4)
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Ground Weather Radar Station Sacramento, 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.