Tuesday, August11, 2020
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Marine Weather and Tides
Diablo Grande, 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 6:17AMSunset 8:04PM Tuesday August 11, 2020 5:59 PM PDT (00:59 UTC) Moonrise 11:29PMMoonset 12:50PM Illumination 44% Phase: Third Quarter Moon; Moon at 23 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- 237 Pm Pdt Tue Aug 11 2020
Tonight..NW winds 5 to 15 kt.
Wed..NW winds 5 to 15 kt.
Wed night..W winds 5 to 15 kt.
Thu..NW winds 5 to 15 kt.
Thu night..NW winds up to 10 kt.
Fri..NW winds 5 to 15 kt.
Fri night..W winds up to 10 kt.
Sat..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
PZZ500 237 Pm Pdt Tue Aug 11 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1028 mb high centered 1100 miles west of cape blanco will move slowly closer to the west coast through late week while weakening as a low pressure system develops in the gulf of alaska. Northwest winds will increase today through Thursday before decreasing on Friday. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.


7 Day Forecast for Marine Location Near Diablo Grande, CA
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location: 37.52, -121.45     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 112326 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 426 PM PDT Tue Aug 11 2020

SYNOPSIS. A slight cooling trend will continue today, especially across the interior. Meanwhile, little change is anticipated near the coast with the typical ebb and flow of low clouds each night/morning. A warming trend is forecast to begin on Wednesday and continue through the end of the week and into the weekend.

DISCUSSION. as of 01:59 PM PDT Tuesday . Afternoon satellite imagery shows clouds have rolled back to the coast again and in some spots actually cleared. Despite the increased sunshine this afternoon temperatures still remain cool and in many spots are actually a few degrees colder than Monday.

In the near term . clouds lurking over the coastal waters will move inland again tonight with some patchy drizzle possible along the coast.

After a period of rather quiet weather the next few days will get interesting as it looks like heat may impact our region with possible thunderstorms.

The large scale pattern shows an upper trough anchored over the PacNW and a large upper ridge of high pressure over TX and the Desert Southwest. Over the next 24 hours the upper trough will ease northward as the high to the southeast builds westward. As a result, 500 mb heights will begin to increase over the region. The rising heights will help to compress the marine layer. The net result will be a warming trend beginning Wednesday. High pressure will nudge it's way farther west on Thursday adding even more warming to the region. More importantly the flow aloft will become more southerly Thursday/Friday. The southerly flow will tap in to residual tropical moisture and advect it northward. Models have hinted at this scenario for a few days, but the 12Z run is showing higher confidence with tropical moisture. Latest NAM and GFS bring moisture northward into Monterey/San Benito by Thursday afternoon and then everywhere else Friday. Instability was lacking on previous model runs, but today's run is showing more instability. Modified Total Totals are greater than 30 (a good sign for instability above 700mb), MU CAPE is over a 100 j/kg and lapse rates are approaching 7. Lastly, there is a little upper level jet support too. All that being said, the models have enough ingredients at play increase concerns for thunderstorms Thursday afternoon and Friday. However, would like more model run consistency before going all in with thunder. If trends continue then the night shift will likely add thunderstorms.

Thunderstorm threat ends by Saturday as the moisture continues northwar. Behind the departing moisture higher heights aloft continue and a warmer airmass will follow. Models continue to project 850mb temps in the mid and upper 20C range. As a result, highs will continue to warm with lower 100s across the interior. Bumped up high temperatures Saturday into early next week. Lingering onshore flow will keep coastal temperatures in check, but inland valleys will be toasty. Heat risk concerns increase as a result and guidance now shows moderate to high heat risk. As confidence continues to increase for heat risk a heat watch may be needed beginning Saturday for East Bay Valleys and Southern Monterey/San Benito.

AVIATION. as of 4:26 PM PDT Tuesday . For 00z TAFs. The marine layer depth is 2000 feet. Breezy west to northwest winds into the afternoon and early evening. Persistent pattern is likely through Wednesday morning with low clouds spreading back inland overnight along with diminishing wind speeds.

Vicinity of KSFO . VFR. Afternoon and evening wind west to northwest wind 15 to 25 kt. Winds speeds diminish slightly overnight with increased confidence of MVFR/IFR ceilings developing around 12Z Wednesday. VFR is forecast to return 16Z Wednesday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Breezy west to northwest winds diminishing by mid evening. High confidence of an early return of IFR/LIFR ceilings overnight. VFR returning by late Wednesday morning.

MARINE. as of 3:28 PM PDT Tuesday . A 1028 mb high centered 1100 miles west of Cape Blanco will move slowly closer to the West Coast through late week while weakening as a low pressure system develops in the Gulf of Alaska. Northwest winds will increase today through Thursday before decreasing on Friday. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . SF Bay until 9 PM



PUBLIC FORECAST: MM AVIATION: RGass/Canepa MARINE: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 40 mi60 min NNW 15 G 17 70°F 76°F1012.6 hPa (-1.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi60 min NW 14 G 20 76°F 1010.4 hPa (-1.3)
AAMC1 - 9414750 - Alameda, CA 48 mi60 min W 11 G 15 64°F 70°F1013.2 hPa (-1.3)
LNDC1 48 mi60 min W 6 G 11 65°F 1013 hPa (-1.3)
PCOC1 - 9415144 - Port Chicago, CA 48 mi60 min W 14 G 17 74°F 71°F1011 hPa (-1.3)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA23 mi67 minWNW 1510.00 miFair80°F55°F42%1010.6 hPa
San Jose / Reid / Hillv, CA23 mi73 minWNW 810.00 miClear79°F57°F48%1011.8 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrW12W11W9W10W10NW8NW8NW6NW7NW8NW7NW7NW5NW8NW5NW7NW8NW7NW9NW14NW14W16NW15W14
1 day agoW10NW9W4SW5W7NW6NW7W6W7W3CalmW3W4W6W4W5W5SW7NW11W13W15W16
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2 days agoNW11NW10W8NW7SW3W4CalmNW3CalmCalmCalmCalmCalmCalmW434SW7SW9W10W10W12W14W11

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Tue -- 01:47 AM PDT     3.44 feet High Tide
Tue -- 06:18 AM PDT     Sunrise
Tue -- 09:22 AM PDT     0.82 feet Low Tide
Tue -- 09:47 AM PDT     Last Quarter
Tue -- 01:50 PM PDT     Moonset
Tue -- 03:12 PM PDT     2.38 feet High Tide
Tue -- 08:02 PM PDT     Sunset
Tue -- 08:07 PM PDT     1.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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33.43.43.32.92.41.81.310.80.91.11.622.22.42.321.61.211.11.52.1

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Tue -- 02:10 AM PDT     -0.00 knots Slack
Tue -- 05:56 AM PDT     -0.83 knots Max Ebb
Tue -- 06:17 AM PDT     Sunrise
Tue -- 09:47 AM PDT     Last Quarter
Tue -- 10:17 AM PDT     0.00 knots Slack
Tue -- 12:49 PM PDT     0.34 knots Max Flood
Tue -- 01:50 PM PDT     Moonset
Tue -- 03:04 PM PDT     -0.00 knots Slack
Tue -- 06:13 PM PDT     -0.55 knots Max Ebb
Tue -- 08:02 PM PDT     Sunset
Tue -- 09:20 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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0.60.40.1-0.3-0.6-0.8-0.8-0.8-0.6-0.4-0.10.20.30.30.30-0.3-0.5-0.6-0.5-0.4-0.10.20.5

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 (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.