Thursday, February20, 2020
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Marine Weather and Tides
Cupertino, 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 6:49AMSunset 5:53PM Thursday February 20, 2020 5:24 AM PST (13:24 UTC) Moonrise 5:19AMMoonset 3:13PM Illumination 11% Phase: Waning Crescent; Moon at 26 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 251 Am Pst Thu Feb 20 2020
Today..NW winds up to 10 kt. Wind waves 1 to 2 ft. NW swell 3 to 4 ft at 14 seconds and sw around 2 ft at 15 seconds.
Tonight..N winds up to 10 kt. Wind waves 1 ft. NW swell 3 to 4 ft at 14 seconds and sw around 2 ft at 15 seconds.
Fri..N winds 5 to 15 kt. Wind waves 1 ft. W swell 4 to 6 ft at 14 seconds and sw around 2 ft at 15 seconds.
Fri night..S winds up to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 14 seconds. A slight chance of rain.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 4 to 6 ft at 13 seconds.
Sat night..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 6 to 7 ft. NW swell 3 to 5 ft at 17 seconds.
Sun..NW winds 10 to 20 kt. Wind waves 7 to 8 ft. NW swell 5 to 7 ft.
Mon..NW winds 10 to 20 kt. Wind waves 6 to 7 ft. NW swell 5 to 7 ft.
PZZ500 251 Am Pst Thu Feb 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwesterly winds are forecast to prevail over the coastal waters today. A low pressure system will arrive to the central coast on Friday, bringing with it a chance of light rain to the waters south of point pinos. Dry weather returns Sunday and Monday. A moderate northwest swell persists through the week along with a light southerly swell.


7 Day Forecast for Marine Location Near Cupertino, CA
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location: 37.31, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 201141 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 341 AM PST Thu Feb 20 2020

SYNOPSIS. Warming temperatures continue through the end of the week as the next system passes to the south. A chance of rain is possible for the Central Coast on Friday into Saturday morning, though accumulations are forecast to be minimal. The Bay Area will see dry conditions and mild temperatures are forecast to continue through next week.

DISCUSSION. as of 02:53 AM PST Thursday . A layer of stratus has built up over the Salinas Valley and Monterey Bay. High clouds pass over the Bay Area keeping temperatures in the 40s and even isolated areas in the low 50s. Temperatures around approximately two degrees warmer than at this time yesterday for most locations around the Bay Area and the Central Coast, though the potential for isolated valleys could be cooler. High clouds are expected to build on Thursday ahead of the next system moving toward the Pacific Coast.

An upper level low continues to grow west of California over the Pacific Ocean and dig southeastward. Models are depicting it kicking toward Southern California on Friday bringing chances of precipitations for the southern aspect of our region, from the Santa Cruz Mountains and East Bay Hills Southward, though best chances remain in southeastern Monterey County and at higher elevations. Accumulations are forecast to be maybe a tenth of an inch at most. As the low moves onshore, it'll switch the winds for the region to offshore and from the southwest. The low is forecast to retain its shape, yet have a looser pressure gradient, so winds may provide a few breezes, but remain relatively minimal.

However, that system will remain to the south and impact the Central Coast. The Bay Area will remain dry. Temperatures should reach the upper 60s and even the low 70s on Thursday and warm into the low to mid 70s on Friday thanks in part to the offshore flow. Winds should be light with high clouds present.

After that, the upper level ridge over the Pacific Ocean rebuilds bringing high pressure to dominate the region for the next week. A weak trough should pass over the Pacific Northwest midweek, but remain well north of the region. Both GFS and ECMWF models are trying to depict another trough transitioning into a cutoff low for next weekend into the beginning of March. Unfortunately, both models having upper level steering driving it south of the Bay Area. It appears for the time being that the Bay Area and the Central Coast will continue to see the same mild temperatures, but also dry conditions. And of course meaning that rain, let alone significant rainfall, will not be on the horizon.

AVIATION. as of 3:41 AM PST Thursday . For 12Z TAFs. VFR conditions are forecast to prevail this morning at the San Francisco Bay Area terminals. GOES-West infrared imagery does show some stratus that has developed in the northern Salinas Valley, impacting Salinas and Watsonville with LIFR ceilings and visibilities. Any low clouds and fog will mix-out around mid/late morning with VFR conditions prevailing this afternoon with passing high clouds. Winds are forecast to remain rather light today.

Vicinity of KSFO . VFR conditions are forecast to prevail with passing high clouds. Light winds this morning will eventually become west/northwest this afternoon around 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . LIFR at Salinas with fog and low ceilings. Monterey has remained VFR, but the stratus remains just offshore and about 5SM away from the terminal as of the 12Z TAF publication. Can't rule out a brief period with low ceilings at Monterey between now and sunrise. VFR conditions will return as the low clouds and fog mix-out. Light offshore winds this morning will become onshore later today.

MARINE. as of 2:51 AM PST Thursday . Light northwesterly winds are forecast to prevail over the coastal waters today. A low pressure system will arrive to the Central Coast on Friday, bringing with it a chance of light rain to the waters south of Point Pinos. Dry weather returns Sunday and Monday. A moderate northwest swell persists through the week along with a light southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: DK AVIATION: Rowe MARINE: Rowe

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 16 mi55 min S 1 G 1.9 47°F 57°F1019.5 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi55 min E 1.9 G 2.9 50°F 56°F1019.1 hPa
LNDC1 36 mi55 min S 1 G 1 51°F 1019 hPa
OBXC1 37 mi55 min 50°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi55 min SE 4.1 G 4.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi55 min N 2.9 G 2.9 51°F 1018.1 hPa
PXSC1 38 mi55 min 52°F 48°F
ELXC1 - Elkhorn Slough Reserve, CA 38 mi100 min SE 2.9 43°F 1018 hPa43°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi55 min SSE 1.9 G 2.9 49°F 1019.1 hPa
46092 - MBM1 39 mi68 min E 12 47°F 53°F1017.8 hPa (-1.0)
FTPC1 - 9414290 - San Francisco, CA 40 mi55 min NE 5.1 G 7 50°F 54°F1019.1 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 40 mi35 min ESE 5.8 G 9.7 48°F 55°F4 ft1019.3 hPa47°F
46114 - West Monterey Bay, CA 43 mi25 min 55°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi35 min WSW 5.8 G 5.8 51°F 53°F4 ft1019.7 hPa49°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi55 min NW 1.9 G 5.1 51°F 1019.4 hPa
46237 - San Francisco Bar, CA (142) 45 mi55 min 53°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 45 mi44 min Calm 49°F 1019 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi55 min NW 4.1 G 5.1 50°F 54°F1018.8 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi55 min 55°F2 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA8 mi32 minSSE 510.00 miFair42°F35°F76%1019 hPa
San Carlos Airport, CA18 mi30 minN 010.00 miFair45°F37°F76%1019.6 hPa
Hayward, Hayward Air Terminal, CA24 mi31 minENE 310.00 miFair45°F36°F71%1020.1 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California
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Upper Guadalupe Slough
Click for Map
Thu -- 05:14 AM PST     3.19 feet Low Tide
Thu -- 05:19 AM PST     Moonrise
Thu -- 06:51 AM PST     Sunrise
Thu -- 10:14 AM PST     10.15 feet High Tide
Thu -- 03:12 PM PST     Moonset
Thu -- 05:52 PM PST     Sunset
Thu -- 06:06 PM PST     -0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.17.46.14.83.73.23.657910.19.98.97.25.12.91.1-0-0.5-01.33.25.47.4

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 -- 03:27 AM PST     -0.61 knots Max Ebb
Thu -- 05:03 AM PST     0.00 knots Slack
Thu -- 05:19 AM PST     Moonrise
Thu -- 06:51 AM PST     Sunrise
Thu -- 07:41 AM PST     1.05 knots Max Flood
Thu -- 10:22 AM PST     -0.00 knots Slack
Thu -- 03:13 PM PST     Moonset
Thu -- 03:15 PM PST     -1.36 knots Max Ebb
Thu -- 05:52 PM PST     Sunset
Thu -- 05:55 PM PST     0.00 knots Slack
Thu -- 08:51 PM PST     1.52 knots Max Flood
Thu -- 11:56 PM PST     -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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-0.2-0.4-0.6-0.6-0.6-00.6110.80.3-0.3-0.7-1.1-1.3-1.4-1.3-0.80.10.91.41.51.30.7

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)
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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.