Thursday, April2, 2020
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Marine Weather and Tides
Pleasanton, 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 7:32PM Thursday April 2, 2020 8:11 PM PDT (03:11 UTC) Moonrise 12:23PMMoonset 2:29AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 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- 214 Pm Pdt Thu Apr 2 2020
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 15 to 25 kt with gusts up to 30 kt, becoming nw 5 to 15 kt after midnight.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt.
Fri night..W winds 10 to 20 kt with gusts up to 25 kt.
Sat..SW winds 5 to 15 kt. Rain likely.
Sat night..S winds 5 to 10 kt. A chance of rain.
Sun..S winds 10 to 15 kt. Rain.
Sun night..SW winds 5 to 10 kt. Rain likely.
Mon..W winds up to 10 kt. Rain likely.
Tue..W winds up to 10 kt.
PZZ500 214 Pm Pdt Thu Apr 2 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds will prevail across the coastal waters with occasional gale force gusts are possible through tonight and into Friday. These winds will produce fresh and steep wind generated waves, creating hazardous conditions for smaller vessels. Winds will begin to subside late Friday and into the weekend. A moderate, predominately winds driven, northwesterly swell will prevail through much of the forecast period.


7 Day Forecast for Marine Location Near Pleasanton, CA
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location: 37.66, -121.89     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 022348 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 448 PM PDT Thu Apr 2 2020

SYNOPSIS. Dry weather conditions with slightly below normal temperatures today and tomorrow. A pair of storm systems arrive this weekend. The first system on Saturday will be mainly focused over the North Bay/Shoreline with breezy winds. The second stronger system arrives Sunday and will bring widespread rain, gusty southerly winds, isolated thunderstorms, cooler temperatures, and lingering showers through potentially much of next week.

DISCUSSION. as of 03:00 PM PDT Thursday . Satellite imagery shows clear skies from the North Bay through Big Sur early this afternoon with only a few clouds lingering around 75 miles offshore. High pressure is present offshore today and will gradually build ashore and begin to weaken through the next 36 hours. Afternoon highs are generally ranging in the low to mid 60s, which is near to slightly below normal for this time of the year. This comes after a chilly start to the day with widespread 30s to 40s and isolated patches of frost in the inland valleys. For tonight, expect similar but marginally warmer overnight lows by a degree or two. That said, patchy frost will be possible into the predawn and sunrise hours once again tomorrow morning, due particularly to a decrease in mixing winds forecast near the surface tonight. Tomorrow will be similar to today except with slightly cooler temperatures and increasing high level cloud cover arriving from the northwest ahead of the next storm system.

For the weekend, a pair of storm systems will arrive and bring unsettled weather throughout the weekend and into early next week. The first of these systems will be the weaker of the two, featuring a more tightly bound 542dm 500mb upper low skirting across extreme NW California. The frontal boundary ahead of the parent upper low will first bring rain (0.25-0.50") to the North Bay throughout the morning, before shifting focus to the SF Bay Area around midday Saturday (0.10-0.30"), and eventually weakening before shifting farther southward towards the Central Coast by the evening (0.05-0.20"). Moderate southerly winds will precede and accompany the surface cold front on the order of 10-20mph sustained with gusts 15-25mph.

Then, lingering isolated showers will persist overnight before the arrival of the next storm system early Sunday, a broader, more organized 530-535dm 500mb upper low. This second storm system is anticipated to bring approximately 2 to 3 times as much precipitation as the first storm system (0.50-1.00" regionwide for urban areas, 1.50-2.50" for coastal ranges), with gusty southerly winds (15-25mph sustained, gusts up 25-40mph), and a cooler, more unstable air mass arriving with it. The post frontal instability will allow for the deeper development of convection and with that, the possibility of hail and even thunderstorms. Snow levels will also drop down to as low as 3000-3500 ft in the post frontal environment into Sunday night, allowing for a dusting of snow amongst the highest peaks across the forecast region (and much more over the Sierra -- check out NWS Sacramento or NWS Reno for the Tahoe forecast). Latest model runs suggest the upper low will slow down as shifts southward into Southern California, extending the possibilities of linger/wrap around showers throughout much of next week.

AVIATION. as of 4:46 PM PDT Thursday . For 00Z TAFs. VFR as clear skies surround the region. Winds remain onshore and breezy, with isolated occasional stronger gusts. Winds will ease slightly overnight. Skies are expected to remain mostly clear with a few clouds above 1,500 feet. VFR forecast Friday as winds strengthen in the late afternoon/evening.

Vicinity of KSFO . Clear skies and VFR. Winds remain onshore and 15-18 knots with occasional stronger gusts. Winds will ease over night slightly, but remain breezy. Skies should also remain mostly clear and VFR, but cannot rule out a few midlevel clouds. Thursday will be VFR once again, with onshore winds ramping up in the afternoon ahead of the next system approaching.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with breezy onshore winds. Winds will ease overnight. A few clouds may develop over the peninsula, but are not currently forecasting lower than 1,500. VFR once again on Friday with stronger winds in the early evening.

MARINE. as of 02:14 PM PDT Thursday . Moderate northwesterly winds will prevail across the coastal waters with occasional gale force gusts are possible through tonight and into Friday. These winds will produce fresh and steep wind generated waves, creating hazardous conditions for smaller vessels. Winds will begin to subside late Friday and into the weekend. A moderate, predominately winds driven, northwesterly swell will prevail through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Mry Bay until 3 AM 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
RTYC1 - 9414523 - Redwood City, CA 20 mi54 min W 12 G 15 55°F 62°F1019.1 hPa
LNDC1 23 mi54 min WNW 6 G 7 58°F 1018 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi54 min WNW 9.9 G 14 56°F 61°F1018.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi60 min W 11 G 16
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 26 mi60 min WNW 8.9 G 14 60°F 1016.9 hPa
OBXC1 26 mi54 min 56°F 40°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi54 min W 8 G 9.9 56°F 1018 hPa
PCOC1 - 9415144 - Port Chicago, CA 28 mi54 min SW 8.9 G 12 58°F 59°F1017.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 28 mi54 min SW 8 G 15 55°F 1017 hPa
PXSC1 29 mi54 min 57°F 39°F
UPBC1 29 mi54 min W 11 G 13
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi54 min W 9.9 G 11 58°F 59°F1017.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 30 mi54 min WNW 11 G 19 58°F 1018.1 hPa
FTPC1 - 9414290 - San Francisco, CA 32 mi54 min 60°F
RCMC1 - 9414863 - Richmond, CA 33 mi54 min NW 8.9 G 12 56°F 57°F1017.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi54 min WSW 7 G 11 57°F 1017.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 34 mi38 min Calm 55°F 1018 hPa
SFXC1 - San Francisco Bay Reserve, CA 38 mi87 min W 9.9
46237 - San Francisco Bar, CA (142) 40 mi72 min 56°F7 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA5 mi4.3 hrsWSW 1610.00 miFair64°F35°F34%1017.1 hPa
Hayward, Hayward Air Terminal, CA12 mi4.3 hrsW 1910.00 miFair and Breezy61°F37°F41%1019.3 hPa
Oakland, Metro Oakland International Airport, CA18 mi4.3 hrsW 1510.00 miFair63°F39°F41%1018.5 hPa
San Jose, San Jose International Airport, CA20 mi4.3 hrsNW 1210.00 miFair66°F30°F26%1017.8 hPa
San Carlos Airport, CA21 mi85 minWSW 1410.00 miClear55°F32°F41%1019 hPa
Concord, Buchanan Field, CA24 mi3.3 hrsWSW 11 G 1710.00 miFair66°F34°F30%1016 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrW10W9SW6S6S4CalmCalmCalmE3E4NE3CalmCalmCalmCalmCalmSW3N10
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W65NW114--W16
1 day agoW10W11W12W8W9SW4S6SW5SW7SW5SW4SW7SW5W4W4W8NW6W5W7W8W10W8SW10W7
2 days agoW10W9W10W6W8W5CalmCalmCalmCalmCalmCalmE3CalmE3CalmSW4S3CalmCalmW7W7W12W8

Tide / Current Tables for Alameda Creek, San Francisco Bay, California
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Alameda Creek
Click for Map
Thu -- 03:21 AM PDT     0.87 feet Low Tide
Thu -- 03:30 AM PDT     Moonset
Thu -- 06:51 AM PDT     Sunrise
Thu -- 07:34 AM PDT     5.39 feet High Tide
Thu -- 01:25 PM PDT     Moonrise
Thu -- 04:11 PM PDT     -0.01 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 10:23 PM PDT     4.69 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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32.11.30.91.12.23.85.15.45.14.53.62.61.60.80.2-00.20.923.14.14.64.6

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
Thu -- 01:00 AM PDT     -0.45 knots Max Ebb
Thu -- 03:19 AM PDT     0.00 knots Slack
Thu -- 03:29 AM PDT     Moonset
Thu -- 05:39 AM PDT     0.62 knots Max Flood
Thu -- 06:51 AM PDT     Sunrise
Thu -- 08:19 AM PDT     -0.00 knots Slack
Thu -- 01:13 PM PDT     -1.13 knots Max Ebb
Thu -- 01:25 PM PDT     Moonrise
Thu -- 04:08 PM PDT     0.00 knots Slack
Thu -- 07:02 PM PDT     1.23 knots Max Flood
Thu -- 07:32 PM PDT     Sunset
Thu -- 10:25 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.4-0.3-0.10.20.60.60.40.1-0.2-0.5-0.8-1-1.1-1-0.6-0.10.61.11.21.10.80.3-0.2

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 (23,6,7,8)
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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.