Tuesday, August4, 2020
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L-36.com


Marine Weather and Tides
Walnut Creek, 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 6:13AMSunset 8:15PM Tuesday August 4, 2020 7:05 AM PDT (14:05 UTC) Moonrise 8:20PMMoonset 6:05AM Illumination 100% Phase: Full Moon; Moon at 15 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- 213 Am Pdt Tue Aug 4 2020
.small craft advisory in effect from 2 pm pdt this afternoon through this evening...
Today..SW winds 10 to 20 kt. Gusts up to 30 kt this afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 30 kt.
Wed..SW winds 10 to 20 kt with gusts up to 30 kt.
Wed night..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 5 to 15 kt.
Sat..SW winds 5 to 15 kt.
PZZ500 213 Am Pdt Tue Aug 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderately strong and gusty northwesterly winds will continue into the latter part of the week over much of the coastal waters as high pressure remains over the eastern pacific. The strongest winds will be along the immediate coastline south of point sur and north of point reyes. Breezy onshore winds are also expected in the afternoons and evenings over the bays. These winds will generate steep fresh swells resulting in locally hazardous seas, especially for smaller vessels.


7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 041134 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 434 AM PDT Tue Aug 4 2020

SYNOPSIS. A significant cooling trend is forecast today and Wednesday as an upper trough deepens over California. Patchy drizzle or light rain is likely at times through Wednesday, mainly near the coast and in the coastal hills, with the highest likelihood of measurable precipitation tonight and Wednesday morning. In addition, breezy conditions are forecast through Wednesday, with locally gusty west to northwest winds expected during the afternoon and evening hours. Modest warming is forecast late in the week and into the weekend, but temperatures will only bounce back to near seasonal averages.

DISCUSSION. As of 3:40 AM PDT Tuesday . Low clouds rapidly redeveloped near the ocean last evening and have been been spreading inland overnight as both the marine layer depth and onshore flow increase in response to an upper trough deepening just off the California coast. The trough is forecast to continue deepening through Wednesday. The primary impacts today and Wednesday will be much cooler temperatures, breezy to locally gusty onshore winds, and damp conditions as the deepening marine layer generates patchy drizzle or light rain near the coast and in the coastal hills.

Measurable precipitation has already occurred overnight in scattered coastal areas from Sonoma County south to San Mateo County, as well as an isolated location in the East Bay Hills. Most locations have only picked up a few hundredths, but nearly a tenth of an inch has accumulated in Montara on the San Mateo County Coast. The low resolution models such as the GFS are, as usual, mostly missing the marine layer precipitation and forecast little or no measurable rainfall over the next couple of days. The NAM is almost certainly forecasting unrealistically high amounts, by generating up to an inch of rain along the Big Sur Coast by late Wednesday. The local WRF model appears most reasonable, both in terms of location and amounts of precipitation. The WRF forecasts up to a third of an inch in western San Mateo County by late Wednesday, and generally a tenth of an inch or less elsewhere near the coast and in the coastal hills. Also, most of this precipitation is expected to fall tonight and Wednesday morning when moist low level flow will be at its maximum.

The combination of increased cloud cover, stronger onshore flow, and a cooler airmass aloft with the upper trough will result in significantly cooler temperatures today and Wednesday, especially inland. Highs today are forecast to be anywhere from 7 to 15 degrees cooler than Monday. Up to an additional 10 degrees of cooling is expected for the inland valleys on Wednesday. By Wednesday, high temperatures are forecast to be anywhere from 5 to 12 degrees cooler than normal.

Steep onshore surface pressure gradients over the next few days will mean breezy conditions, and locally gusty westerly winds are likely, especially through gaps in the terrain such as Altamont Pass in the East Bay, the San Bruno and Crystal Springs gaps in San Mateo County, and other areas where onshore winds are enhanced. Gusts in these areas are expected to be in the range of 30 to 40 mph, especially during the late afternoon and evening hours, and local gusts up to 50 mph are likely.

The upper trough is forecast to lift to the northeast on Thursday and Thursday night. This will result in a gradual warming trend from Thursday into the upcoming weekend. However, models maintain weak upper level troughing and so temperatures are only expected to warm back to around seasonal averages.

AVIATION. As of 4:34 AM PDT Tuesday . For 12z tafs. The marine layer depth is 1,000 to 1,400 feet per recent profiler data. VLIFR- IFR continues to move inland on onshore winds. Expect lowering vsbys and cloud ceilings due to stratus, fog and coastal drizzle. Partial clearing developing in the afternoon otherwise VLIFR-IFR tonight and Wednesday morning.

Vicinity of KSFO . IFR continuing to late morning then clearing. Onshore winds gusty in the afternoon though probably a bit less strong than those on Monday.

SFO Bridge Approach . Similar to SFO.

Monterey Bay Terminals . VLIFR-IFR ceilings continuing to late morning then clearing. VLIFR-IFR tonight and Wednesday morning. Onshore winds through the period occasionally to 15 knots in the afternoon.

MARINE. As of 2:13 AM PDT Tuesday . Moderately strong and gusty northwesterly winds will continue into the latter part of the week over much of the coastal waters as high pressure remains over the eastern Pacific. The strongest winds will be along the immediate coastline south of Point Sur and north of Point Reyes. Breezy onshore winds are also expected in the afternoons and evenings over the bays. These winds will generate steep fresh swells resulting in locally hazardous seas, especially for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 2 PM SCA . Mry Bay from 2 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 2 PM SCA . Pt Arena to Pt Reyes 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 . Pt Reyes to Pigeon Pt 0-10 nm



PUBLIC FORECAST: Dykema AVIATION: Canepa MARINE: Blier

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UPBC1 10 mi47 min NW 7 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi47 min NW 6 G 8 60°F 69°F1013.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 11 mi47 min SW 8 G 12 59°F 69°F1013.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi47 min WNW 8.9 G 12 65°F 1012.5 hPa
LNDC1 14 mi47 min SW 6 G 8.9 58°F 1014.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi47 min WSW 7 G 9.9 60°F 1013.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi47 min SSW 9.9 G 13
AAMC1 - 9414750 - Alameda, CA 16 mi47 min 69°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi47 min SSW 8 G 11 57°F 1014.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi47 min S 12 G 16 58°F 1015 hPa
OBXC1 17 mi47 min 57°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi47 min SSE 4.1 G 6 56°F 1013.8 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi47 min SSE 12 G 14 57°F 65°F1014.3 hPa
PXSC1 20 mi47 min 57°F 57°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi80 min W 9.9
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi31 min SE 4.1 58°F 1015 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi47 min S 2.9 G 8.9 56°F 62°F1014.7 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi47 min W 2.9 G 5.1 61°F 74°F1015.8 hPa
46237 - San Francisco Bar, CA (142) 32 mi95 min 59°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi25 min NW 18 G 23 54°F 52°F1014.9 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi72 minS 1310.00 miFair60°F55°F86%1012.3 hPa
Oakland, Metro Oakland International Airport, CA16 mi72 minSSW 8 G 168.00 miOvercast61°F55°F84%1015 hPa
Hayward, Hayward Air Terminal, CA17 mi71 minW 410.00 miOvercast62°F55°F78%1015.7 hPa
Livermore, Livermore Municipal Airport, CA18 mi72 minN 010.00 miA Few Clouds58°F55°F90%1014.2 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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1 day agoS11S11S6S7SW6NW10NW13NW8W11W11W10SW8S9S13S9S9S11S12S8SW8SE5S9S7SW5
2 days agoS10S10S8S86NW11NW11NW11W7W10W10SW10SW9S7S10S10S11S14
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S12S12S11S11--

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Tue -- 02:02 AM PDT     5.77 feet High Tide
Tue -- 06:14 AM PDT     Sunrise
Tue -- 07:05 AM PDT     Moonset
Tue -- 09:36 AM PDT     -0.28 feet Low Tide
Tue -- 04:01 PM PDT     4.86 feet High Tide
Tue -- 08:14 PM PDT     Sunset
Tue -- 09:13 PM PDT     2.24 feet Low Tide
Tue -- 09:20 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.95.55.85.54.83.72.51.40.5-0.2-0.20.41.42.63.74.64.94.63.93.22.62.22.43

Tide / Current Tables for Roe Island S, Suisun Bay, California Current
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Roe Island S
Click for Map
Tue -- 01:12 AM PDT     0.85 knots Max Flood
Tue -- 04:12 AM PDT     -0.00 knots Slack
Tue -- 06:14 AM PDT     Sunrise
Tue -- 07:04 AM PDT     Moonset
Tue -- 08:17 AM PDT     -2.44 knots Max Ebb
Tue -- 12:18 PM PDT     0.00 knots Slack
Tue -- 03:19 PM PDT     0.83 knots Max Flood
Tue -- 06:23 PM PDT     -0.00 knots Slack
Tue -- 08:13 PM PDT     Sunset
Tue -- 08:56 PM PDT     -1.10 knots Max Ebb
Tue -- 09:20 PM PDT     Moonrise
Tue -- 11:31 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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0.60.80.80.50.1-0.8-1.7-2.2-2.4-2.4-2-1.2-0.30.30.70.80.80.50.1-0.4-0.9-1.1-0.9-0.4

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 (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.