Monday, March30, 2020
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Marine Weather and Tides
Los Altos Hills, 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 6:54AMSunset 7:31PM Monday March 30, 2020 7:09 AM PDT (14:09 UTC) Moonrise 9:42AMMoonset 12:00AM Illumination 39% Phase: Waxing Crescent; Moon at 6 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- 239 Am Pdt Mon Mar 30 2020
Today..SW winds up to 10 kt, becoming W this afternoon.
Tonight..W winds 5 to 15 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt.
Wed..NW winds 10 to 20 kt with gusts up to 30 kt.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt.
Thu..NW winds 5 to 10 kt.
Fri..W winds 5 to 10 kt.
PZZ500 239 Am Pdt Mon Mar 30 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate west to northwest winds will prevail over the coastal waters today. The strongest winds are forecast to impact areas along the big sur coast. By Tuesday afternoon and evening, winds are forecast to increase across all the waters, generating seas that are potentially hazardous to smaller vessels. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.


7 Day Forecast for Marine Location Near Los Altos Hills, CA
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location: 37.35, -122.18     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 301127 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 427 AM PDT Mon Mar 30 2020

SYNOPSIS. Light rain showers will be possible over portions of the North Bay today while dry conditions are likely elsewhere. Dry weather, along with seasonable temperatures, are forecast for most of the remainder of the week. Rain chances return late in the week and potentially continue into early next week.

DISCUSSION. as of 03:01 AM PDT Monday . Dry weather conditions have returned region-wide in wake of the weak system that brought light rainfall to portions of the region yesterday. Meanwhile, partly to mostly cloudy conditions persist this morning with temperatures ranging from the middle 40s to middle 50s. Low clouds over the region may help to limit fog development this morning, especially over the North Bay. Another weather system pushing inland to the north will bring the potential for light rainfall over northern portions of Sonoma and Napa Counties today. Meanwhile, dry conditions are likely to persist to the south, especially south of the Golden Gate.

Seasonably cool and dry conditions are then likely to persist region- wide through much of the week. While the forecast late last week was advertising a warming trend through the workweek, confidence has increased that this scenario will not materialize. Instead, cyclonic flow aloft will persist as a long-wave trough persists over the West. With this, only expecting daytime temperatures to warm into the upper 50s along the immediate coast to 60s inland. While we cannot rule out a few interior locations reaching the lower 70s this week, temperatures generally will remain near to slightly below seasonal averages.

Forecast models bring precipitation back to the region late Friday night to the North Bay and then across the remainder of the region on Saturday. The deterministic models diverge late in the weekend into early next week, yet ensembles support an unsettled pattern continuing with chances of precipitation increasing during the week of April 6th.

AVIATION. as of 4:27 AM PDT Monday . for 12Z TAFs. Widespread MVFR ceilings are present at terminals throughout the San Francisco Bay Area this early morning. Gradual improvements to VFR conditions will likely occur sometime in the mid/late morning hours. Can't rule out some light rain around STS mid-day as the North Bay will be on the southern extent of a system impacting northern California and Oregon. Light winds this morning will become onshore this afternoon. Models bring the ceilings back in the evening/overnight hours.

Vicinity of KSFO . MVFR ceilings this morning with light winds. Expect improvements to VFR conditions around 18Z and through the afternoon. Winds will become west to northwest around mid-day. High resolution models suggest the return of the ceilings sometime between 03-04Z Tuesday . will have to keep a close eye on subsequent model runs and will adjust the TAF accordingly for timing.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR ceilings through mid/late morning with light winds, becoming VFR with onshore winds in the afternoon. Ceilings return in the evening/overnight hours.

MARINE. as of 03:01 AM PDT Monday . Generally light to locally moderate west to northwest winds will prevail over the coastal waters today. The strongest winds are forecast to impact areas along the Big Sur Coast. By Tuesday afternoon and evening, winds are forecast to increase across all the waters, generating seas that are potentially hazardous to smaller vessels. Mixed swell will persist with a moderate northwest swell and a light southwesterly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM



PUBLIC FORECAST: RGass 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 11 mi52 min W 4.1 G 5.1 53°F 59°F1025.4 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi52 min WSW 4.1 G 6 54°F 58°F1024.9 hPa
LNDC1 31 mi52 min SW 2.9 G 5.1 54°F 1024.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi52 min SW 5.1 G 7
OBXC1 33 mi52 min 54°F 46°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi52 min ESE 4.1 G 6 53°F 1023.8 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi52 min SW 4.1 G 6 53°F 1024.9 hPa
PXSC1 33 mi52 min 55°F 47°F
FTPC1 - 9414290 - San Francisco, CA 35 mi52 min 58°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi30 min WSW 5.8 G 12 54°F 56°F1025.5 hPa47°F
46237 - San Francisco Bar, CA (142) 39 mi40 min 55°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi36 min Calm 50°F 1025 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi52 min WSW 4.1 G 6 55°F 1025.2 hPa
RCMC1 - 9414863 - Richmond, CA 41 mi52 min WSW 1.9 G 2.9 53°F 56°F1024.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi40 min NNW 7.8 G 9.7 54°F 55°F1025.4 hPa47°F
46092 - MBM1 42 mi42 min N 7.8 54°F 57°F1024.5 hPa (+0.9)
MLSC1 - Moss Landing, South Harbor, CA 43 mi43 min NNE 5.1 G 12 51°F 1025.4 hPa48°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi85 min NNE 2.9 50°F 1037 hPa50°F
46114 - West Monterey Bay, CA 44 mi40 min 56°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi40 min SW 5.8 G 7.8 54°F 55°F1025.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi52 min SW 4.1 G 6 51°F 57°F1024.8 hPa
UPBC1 48 mi52 min WSW 6 G 8
PCOC1 - 9415144 - Port Chicago, CA 49 mi52 min SW 6 G 7 50°F 57°F1024.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi52 min WSW 8 G 8.9 53°F 1024.6 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA10 mi23 minW 310.00 miMostly Cloudy52°F46°F82%1025.7 hPa
San Jose, San Jose International Airport, CA13 mi17 minN 010.00 miOvercast53°F46°F80%1025.1 hPa
San Carlos Airport, CA13 mi15 minN 010.00 miOvercast54°F46°F77%1025.7 hPa
San Jose / Reid / Hillv, CA19 mi20 minN 010.00 miOvercast52°F46°F82%1025.4 hPa
Half Moon Bay Airport, CA20 mi15 minN 010.00 miOvercast50°F46°F88%1025.4 hPa
San Francisco, San Francisco International Airport, CA21 mi14 minN 010.00 miOvercast52°F44°F75%1025.2 hPa
Hayward, Hayward Air Terminal, CA22 mi16 minW 510.00 miOvercast53°F44°F72%1026.2 hPa
Oakland, Metro Oakland International Airport, CA24 mi17 minN 010.00 miOvercast56°F42°F60%1025.5 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Last 24hr------------------------------------------------
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2 days ago------------------------------------------------

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
Click for Map
Mon -- 12:39 AM PDT     3.40 feet Low Tide
Mon -- 12:41 AM PDT     Moonset
Mon -- 05:37 AM PDT     7.72 feet High Tide
Mon -- 06:55 AM PDT     Sunrise
Mon -- 10:41 AM PDT     Moonrise
Mon -- 01:08 PM PDT     0.81 feet Low Tide
Mon -- 06:41 PM PDT     6.26 feet High Tide
Mon -- 07:30 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.53.43.95.16.57.57.66.85.43.92.71.81.10.81.12.13.65.16.16.25.85.24.84.4

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
Mon -- 12:41 AM PDT     Moonset
Mon -- 02:20 AM PDT     0.63 knots Max Flood
Mon -- 04:54 AM PDT     -0.00 knots Slack
Mon -- 06:55 AM PDT     Sunrise
Mon -- 10:07 AM PDT     -1.03 knots Max Ebb
Mon -- 10:41 AM PDT     Moonrise
Mon -- 12:50 PM PDT     0.00 knots Slack
Mon -- 03:35 PM PDT     0.89 knots Max Flood
Mon -- 07:17 PM PDT     -0.00 knots Slack
Mon -- 07:29 PM PDT     Sunset
Mon -- 10:46 PM PDT     -0.43 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.60.60.3-0-0.2-0.5-0.7-0.9-1-0.8-0.40.10.50.80.90.70.50.1-0.1-0.3-0.4-0.4

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 (10,2,3,4)
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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.