Friday, July10, 2020
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Marine Weather and Tides
Livermore, 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 5:53AMSunset 8:31PM Friday July 10, 2020 9:13 AM PDT (16:13 UTC) Moonrise 11:15PMMoonset 10:16AM Illumination 73% Phase: Waning Gibbous; Moon at 20 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- 316 Am Pdt Fri Jul 10 2020
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..SW winds 5 to 15 kt, increasing to 15 to 25 kt this afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 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 with gusts up to 25 kt.
Sun night..SW winds 10 to 20 kt with gusts up to 25 kt.
Mon..SW winds 5 to 15 kt...afternoon gusts to 20 kt.
Tue..SW winds 5 to 15 kt...afternoon gusts to 20 kt.
PZZ500 316 Am Pdt Fri Jul 10 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A strong surface high pressure system over the eastern pacific will result in gusty northwest winds over the coastal waters at least through Monday. Gusty afternoon and evening west winds will also develop over the bays. Northwest winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels.


7 Day Forecast for Marine Location Near Livermore, CA
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location: 37.6, -121.66     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101201 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 501 AM PDT Fri Jul 10 2020

SYNOPSIS. Very warm and dry conditions will continue inland through the weekend, with Sunday expected to be the warmest day. However, onshore flow will keep areas near the coast mild, and maintain areas of night and morning coastal low clouds and fog. An inland cooling trend is forecast for the first half of next week.

DISCUSSION. As of 3:20 AM PDT Friday . An broad upper level ridge centered over the southwestern U.S. will continue to dominate our weather through the weekend, maintaining very warm to hot conditions inland. A shallow marine layer and persistent onshore surface flow will keep coastal temperatures mild.

Early morning satellite imagery reveals widespread low clouds and fog along the coast from San Mateo County northward, with clear skies from Santa Cruz County southward. Low clouds have been gradually developing southward down the coast, and would expect stratus to form around Monterey Bay by daybreak. Surface pressure gradients are similar to yesterday morning, except slightly more onshore. Meanwhile, the Fort Ord Profiler indicates that the marine layer depth has decreased to less than 1000 feet as the ridge to our southeast strengthens and expands. More widespread coastal low clouds this morning and slightly stronger onshore flow will be offset by a shallower marine layer an a warming airmass aloft. The net result will likely be slightly cooler temperatures near the coast today, and slight warming inland.

Little change is forecast into Saturday, except for continued gradual warming inland. Models continue to indicate that Sunday will be the warmest day. At first glance, this appears dubious as models also forecast a slight weakening of the upper ridge over California on Sunday as a shortwave trough moves into the Pacific Northwest. However, closer examination of model data reveals weaker seabreeze winds on Sunday and also the development of weak offshore flow near the top of the boundary layer for a brief time on Sunday morning, which will bring even drier air into our region and allow for additional warming. Inland valleys will warm from the 90s to around 100 today to the mid 90s to 105 on Sunday. By contrast, areas near the ocean will see high temperatures mostly remain in the 60s to lower 70s. But you won't have to travel very far inland to quickly warm into the 80s and 90s due to the shallow nature of the marine layer.

The very warm to hot daytime temperatures inland over the next three days will be uncomfortable, especially for those sensitive to heat. However, Heat Risk is forecast to remain mostly in the moderate category, with only isolated pockets of high Heat Risk expected. The lack of widespread high Heat Risk is because overnight temperatures are forecast to cool in the 50s and lower 60s, allowing for relief from the heat during the nighttime hours. Only the hills will remain warm at night, where overnight lows forecast to be in the lower 70s.

Hot and dry conditions across inland areas over the next three days will mean continued fire weather concerns, especially in the hills where daytime relative humidity will drop as low as the single digits and overnight humidity recovery will be poor. However, winds are forecast to remain light which will lessen the danger posed by the hot, dry conditions.

The upper ridge is forecast to weaken a bit further over California during the first half of next week, although not enough to result in any significant cooling of the airmass aloft over our region. But both the GFS and ECMWF forecast a cooling trend at the surface from Monday through Wednesday of next week, with high temperatures by Wednesday forecast to be anywhere from 7 to 15 degrees cooler than over the weekend. The reason for this cooling can likely be attributed to the development of southerly low level winds along the coast by Tuesday and especially Wednesday. These southerly winds will allow for more efficient inland transport of marine air and thus cooler temperatures for inland areas. The NBM forecasts more subtle cooling compared to the GFS and ECMWF MOS guidance, so have gone with a compromise temperature forecast between the NBM and MOS guidance in the extended forecast.

AVIATION. As of 5:01 AM PDT Friday . Lower to mid level ridging continues to compress the marine layer to 1,000 feet or lower per recent profiler data. It's VFR except along the immediate coastline it's VLIFR-IFR due to fog and stratus which will tend to thin out during the day then return along the coast tonight and Saturday morning.

Vicinity of KSFO . VFR. Northwest to west wind increasing to 20 to 30 knots in the afternoon and evening. West wind easing to 10 to 15 knots tonight and Saturday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VLIFR-IFR developing this morning, clearing /VFR/ back to the coast by late morning or early afternoon. VLIFR- IFR tonight and Saturday morning.

MARINE. As of 3:16 AM PDT Friday . A strong surface high pressure system over the eastern Pacific will result in gusty northwest winds over the coastal waters at least through Monday. Gusty afternoon and evening west winds will also develop over the bays. Northwest winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. 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 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 . Mry Bay from 3 PM SCA . SF Bay from 1 PM



PUBLIC FORECAST: Dykema AVIATION/MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 30 mi56 min NNW 1.9 G 2.9 60°F 74°F1017 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi56 min WNW 12 G 15 73°F 1014.4 hPa
AAMC1 - 9414750 - Alameda, CA 36 mi56 min W 2.9 G 6 55°F 71°F1016.8 hPa
LNDC1 36 mi56 min WSW 2.9 G 4.1 56°F 1016.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 37 mi56 min W 12 G 15 67°F 70°F1015.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 38 mi56 min WSW 1.9 G 2.9
UPBC1 39 mi56 min NW 11 G 13
OKXC1 - 9414776 - Oakland (Berth 34), CA 39 mi56 min W 2.9 G 4.1 56°F 1016.7 hPa
OBXC1 39 mi56 min 55°F 55°F
MZXC1 - 9415102 - Martinez-Amorco CA 39 mi56 min NW 11 G 14 64°F 69°F1015.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi56 min WSW 5.1 G 8.9 55°F 1015.7 hPa
PXSC1 42 mi56 min 55°F 55°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 43 mi56 min SSW 11 G 16 54°F 1016.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 45 mi56 min W 5.1 G 7 62°F 1015.5 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi56 min WSW 5.1 G 9.9 52°F 61°F1016.9 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi56 min SSE 8 G 11 56°F 65°F1016.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi89 min WNW 11
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi40 min SSE 8.9 58°F 1016 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA11 mi81 minW 410.00 miFair67°F51°F57%1014.9 hPa
San Jose / Reid / Hillv, CA20 mi87 minN 010.00 miClear64°F55°F73%1016.6 hPa
San Jose, San Jose International Airport, CA21 mi81 minNNW 310.00 miA Few Clouds64°F55°F73%1016.1 hPa
Mountain View, Moffett Field, CA24 mi2.3 hrsN 010.00 mi61°F55°F83%1015.9 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hr3W35SW6SW5W8W10W14W13W11W5W7W5NW5NW4CalmCalmCalmNW6W4NW3CalmW4W4
1 day ago3SW535W9W13W13W16W15W8SW10NW8NW9NW7NW6NW5NW8W4W3W3CalmCalmCalmCalm
2 days ago4NW4S6SW7SW7SW6W10W13W13W11W9W4NW5W6NW4W7W4W4W3CalmSW3CalmCalmCalm

Tide / Current Tables for Coyote Creek, Tributary no.1, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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
Fri -- 02:02 AM PDT     0.79 knots Max Flood
Fri -- 04:50 AM PDT     -0.01 knots Slack
Fri -- 05:56 AM PDT     Sunrise
Fri -- 09:27 AM PDT     -1.09 knots Max Ebb
Fri -- 11:18 AM PDT     Moonset
Fri -- 12:09 PM PDT     0.00 knots Slack
Fri -- 02:54 PM PDT     1.17 knots Max Flood
Fri -- 06:20 PM PDT     -0.01 knots Slack
Fri -- 08:30 PM PDT     Sunset
Fri -- 10:09 PM PDT     -0.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.60.80.70.4-0-0.4-0.7-0.9-1.1-1-0.6-0.10.511.210.70.2-0.2-0.4-0.6-0.7-0.6

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 (12,3,4,5)
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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.