Sunday, August9, 2020
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Marine Weather and Tides
Mountain View, 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 6:18AMSunset 8:08PM Sunday August 9, 2020 12:48 PM PDT (19:48 UTC) Moonrise 10:33PMMoonset 10:58AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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- 847 Am Pdt Sun Aug 9 2020
Today..NW winds 5 to 15 kt. Gusts up to 25 kt this afternoon.
Tonight..NW winds 5 to 15 kt.
Mon..NW winds 5 to 15 kt.
Mon night..NW winds 5 to 15 kt.
Tue..NW winds 10 to 20 kt with gusts up to 25 kt.
Tue night..W winds 5 to 15 kt.
Wed..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
PZZ500 847 Am Pdt Sun Aug 9 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Split flow continues with predominately southerly winds along the coast and southern outer waters and diminishing northerly winds in the northern outer waters. Locally hazardous seas conditions will persist over the northern outer waters into this evening. Meanwhile, locally breezy winds are expected this afternoon and evening over the northern san francisco bay near the golden gate and to the delta. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell.


7 Day Forecast for Marine Location Near Mountain View, CA
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location: 37.45, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 091808 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1108 AM PDT Sun Aug 9 2020

SYNOPSIS. Warmer temperatures are expected to continue through the remainder of the weekend, especially inland. Slightly cooler weather returns early next week.

DISCUSSION. as of 09:00 AM PDT Sunday . The ongoing forecast remains on track this morning with temperatures already warming into the 60s to even lower 70s at this hour. This is a result of a shallow marine layer that also brought about more widespread coastal fog earlier this morning. Look for low clouds and fog to dissipate through mid-morning and give way to mostly sunny and warmer conditions this afternoon. For additional details, please see the previous forecast discussion below.

PREV DISCUSSION. As of 3:00 AM PDT Sunday . A weak upper low lies just off the central California coast while upper level highs cover the eastern Pacific and the southern United States. The marine layer has compressed to near 1000 ft this morning and there is less inland penetration of the low clouds. With the lower marine layer areas of fog can be expected along the coast through midmorning. Already getting reports of visibilities below 1 mile at Half Moon Bay and 1/2 mile at Watsonville. Easterly flow aloft around the upper low is bringing high clouds from the Sierras which are remnants of afternoon convection.

Temperatures will be a few degrees warmer today with highs ranging from the upper 60s to low 70s at the coast to the 90s inland. May hit 100 in some of the warmest locations. 500 mb heights will start to fall Monday as an upper level trough over British Columbia drops south and flattens the upper ridge. This will begin a cooling trend that will last into the middle of the week with temperatures returning to near normals by Tuesday and Wednesday.

A couple of things of interest to watch in the long range. The upper high over the south is forecast to shift west to Arizona by next weekend resulting in more significant warming inland. Also will be watching a tropical system off Mexico moving northwest during the week that could possibly bring some mid and high moisture into southern or central California by next weekend as it rotates around the upper high.

AVIATION. As of 11:05 AM PDT Sunday . for 18z TAFs. The rather compressed marine layer evacuated to the coastline by late morning. Widespread VFR with generally light winds are expected today. Locally breezy conditions through coastal gaps of up to 10 to 15kt are expected by later this afternoon to early evening. For tonight, the marine layer will be further compressed, thinning the layer, and pushing bases even lower. As a result, more terminals are anticipated to remain VFR SKC tonight however the distribution of fog and associated reductions in visby are more of a threat tonight, particularly at KMRY/KSNS. Mix out times tomorrow morning in the 1500-1630Z time range are expected.

Vicinity of KSFO . VFR today. NNE winds late this morning before switching back to onshore at around 15 kt around 2230-2300Z, similar to yesterday. For tonight, KSFO will be on the periphery of the compressed marine layer with low confidence on if the airport will see BKN/OVC cigs in the LIFR-IFR range. Will need to watch satellite closely to establish trends later today.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR today, compressed marine layer returns around 04Z tonight. Compressed marine layer will bring high likelihood of FG at terminals with drastic reductions in visibility, though the layer will be too thin for a significant impact from DZ. Rapid clearing by 16Z expected due to thin layer.

MARINE. as of 11:03 AM PDT Sunday . Split flow continues with predominately southerly winds along the coast and southern outer waters and diminishing northerly winds in the northern outer waters. Locally hazardous seas conditions will persist over the northern outer waters into this evening. Meanwhile, locally breezy winds are expected this afternoon and evening over the northern San Francisco Bay near the Golden Gate and to the Delta. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . SF Bay from 3 PM



PUBLIC FORECAST: RGass/W Pi AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 9 mi54 min N 6 G 8 68°F 74°F1014.4 hPa
AAMC1 - 9414750 - Alameda, CA 26 mi54 min W 6 G 8 67°F 69°F1014.1 hPa
LNDC1 27 mi54 min NW 5.1 G 7 67°F 1014 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 28 mi54 min WNW 8 G 8.9
OBXC1 29 mi60 min 61°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 29 mi54 min WNW 11 G 13 60°F 1014.1 hPa
PXSC1 30 mi54 min 65°F 59°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 30 mi54 min WSW 8 G 9.9 66°F 1013.2 hPa
FTPC1 - 9414290 - San Francisco, CA 33 mi54 min WSW 1.9 G 12 58°F 64°F1014.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 35 mi54 min SSW 12 G 15 61°F 1014.4 hPa
46237 - San Francisco Bar, CA (142) 38 mi48 min 61°F5 ft
RCMC1 - 9414863 - Richmond, CA 38 mi54 min S 5.1 G 7 65°F 65°F1013.8 hPa
UPBC1 41 mi54 min NW 9.9 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi54 min WNW 13 G 14 73°F 70°F1012.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 42 mi54 min W 7 G 8.9 75°F 70°F1012.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi54 min NNW 12 G 15 77°F 1012.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi54 min WNW 5.1 G 6 70°F 1013.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi28 min S 7.8 G 12 58°F 1015 hPa57°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi28 min S 5.8 G 9.7 55°F 56°F1015.1 hPa
MLSC1 - Moss Landing, South Harbor, CA 47 mi47 min W 7 G 20 57°F 1015 hPa56°F
ELXC1 - Elkhorn Slough Reserve, CA 47 mi63 min W 8 62°F 58°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi28 min S 5.8 G 9.7 57°F 59°F1015.3 hPa57°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA4 mi61 minN 510.00 miClear72°F60°F69%1013.9 hPa
San Jose, San Jose International Airport, CA9 mi55 minN 010.00 miFair80°F55°F42%1013.1 hPa
San Carlos Airport, CA11 mi61 minNNE 710.00 miClear68°F62°F83%1013.9 hPa
Hayward, Hayward Air Terminal, CA15 mi54 minW 510.00 miFair77°F57°F52%1014.3 hPa
San Jose / Reid / Hillv, CA15 mi61 minN 010.00 miClear82°F53°F37%1013.5 hPa
Oakland, Metro Oakland International Airport, CA19 mi55 minNW 710.00 miA Few Clouds74°F59°F60%1013.9 hPa
San Francisco, San Francisco International Airport, CA20 mi52 minN 710.00 miA Few Clouds71°F59°F66%1013.6 hPa
Livermore, Livermore Municipal Airport, CA21 mi55 minSW 710.00 miFair87°F52°F30%1012.3 hPa
Half Moon Bay Airport, CA24 mi53 minS 102.50 miFog/Mist59°F55°F88%1015.2 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Last 24hr--------------------------------NW3CalmCalmCalmCalmCalmCalmCalm
1 day ago--------------------------------CalmN4CalmCalmNW3CalmCalmSE4
2 days ago--------------------------------CalmN6CalmNE4CalmCalmCalmSE4

Tide / Current Tables for Calaveras Point, west of, San Francisco Bay, California
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Calaveras Point
Click for Map
Sun -- 04:48 AM PDT     7.27 feet High Tide
Sun -- 06:19 AM PDT     Sunrise
Sun -- 11:35 AM PDT     1.50 feet Low Tide
Sun -- 11:57 AM PDT     Moonset
Sun -- 05:40 PM PDT     8.04 feet High Tide
Sun -- 08:06 PM PDT     Sunset
Sun -- 11:32 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.33.14.45.877.36.964.73.42.31.61.62.33.75.36.87.887.56.55.23.92.8

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Sun -- 02:21 AM PDT     0.85 knots Max Flood
Sun -- 05:22 AM PDT     -0.00 knots Slack
Sun -- 06:19 AM PDT     Sunrise
Sun -- 09:40 AM PDT     -0.87 knots Max Ebb
Sun -- 11:57 AM PDT     Moonset
Sun -- 12:00 PM PDT     0.00 knots Slack
Sun -- 02:43 PM PDT     0.98 knots Max Flood
Sun -- 05:57 PM PDT     -0.01 knots Slack
Sun -- 08:06 PM PDT     Sunset
Sun -- 10:12 PM PDT     -0.87 knots Max Ebb
Sun -- 11:32 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.50.80.80.60.2-0.2-0.4-0.7-0.8-0.8-0.5-00.50.910.80.4-0-0.3-0.6-0.8-0.9-0.7

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
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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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.