Thursday, July9, 2020
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Marine Weather and Tides
Menlo Park, 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 5:54AMSunset 8:33PM Thursday July 9, 2020 3:22 AM PDT (10:22 UTC) Moonrise 10:50PMMoonset 9:20AM Illumination 84% Phase: Waning Gibbous; Moon at 19 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- 221 Am Pdt Thu Jul 9 2020
.small craft advisory in effect from this afternoon through this evening...
Today..W winds up to 10 kt, increasing to 10 to 20 kt with gusts up to 30 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 30 kt.
Fri..W winds 5 to 15 kt.
Fri night..W winds 5 to 10 kt.
Sat..W winds 10 to 20 kt with gusts up to 25 kt.
Sat night..W winds 5 to 15 kt.
Sun..W winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 221 Am Pdt Thu Jul 9 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwest winds will continue through Friday. These winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels. Winds will begin to ease Friday night into Saturday as the high weakens but stronger winds may persist over the northern outer waters.


7 Day Forecast for Marine Location Near Menlo Park, CA
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location: 37.52, -122.16     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 091000 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 300 AM PDT Thu Jul 9 2020

SYNOPSIS. A warming and drying trend will occur through the remainder of the work week and into the upcoming weekend, primarily across the interior. Meanwhile, mild temperatures will persist near the coast, along with areas of night and morning low clouds and fog. Cooling is forecast for inland areas early next week.

DISCUSSION. As of 3:00 AM PDT Thursday . Low clouds have been increasing along the coast from San Francisco southward overnight, and also developing inland from Monterey Bay and up the Salinas Valley. The north-to-south surface pressure gradient from ACV to SFO has been holding at about 5 mb since last evening, enough to mostly prevent stratus from developing in the North Bay or around San Francisco Bay (aside from a few patches). Another factor limiting inland development of low clouds this morning is the shallow depth of the marine layer which currently is at about 1000 feet per the Fort Ord Profiler.

The latest local WRF model indicates light northerly flow will develop near the top of the boundary layer this morning. This dry flow should help clear the shallow low cloud layer relatively quickly this morning, leaving mostly sunny skies for the balance of the day. Temperatures today are expected to be a few degrees warmer than yesterday thanks to increasing subsidence under a broad and strengthening upper ridge that currently extends from West Texas to Southern California. Models agree that this ridge will continue to strengthen and expand northward into the upcoming weekend, resulting in a continued gradual warming trend. This warming trend will primarily impact inland areas, while coastal areas remain seasonably mild due to persistent onshore flow. On Friday a few inland areas, mainly in the North Bay Valleys, will likely experience a pause in the warming trend, or even a temporary slight downturn in temps, as northerly gradients relax. But the overall trend through the weekend will be continued warming. Lower to mid 90s will become more common in the interior valleys over the next two days, with a few 100 degree readings likely in the warmest locations like Lake Berryessa and Pinnacles National Park. Temperatures are expected to peak on Sunday when most inland valley highs are forecast to range from the mid 90s to around 100, while the hottest valleys top out around 105. Meanwhile, persistent onshore surface winds and a shallow marine layer will keep temperatures near the ocean mostly in the 60s and lower 70s.

Although the inland valleys and hills will experience very warm to hot temperatures over the next four days, especially on Saturday and Sunday, Heat Risk is expected to remain mostly in the moderate category. This is because the very dry airmass over inland areas will allow for efficient nighttime cooling. Overnight lows are forecast to be in the 50s and lower 60s at most lower elevation locations. High Heat Risk values are projected only for isolated locations in the inland hills over the weekend, where overnight temperatures will only cool into the 70s.

Hot and dry conditions across inland areas through the weekend will mean continued concerns from a fire weather standpoint as daytime relative humidity values drop as low as the single digits and very poor overnight humidity recoveries occur in the hills. Fortunately, winds are forecast to be mostly light, except for locally moderate afternoon and evening seabreeze winds.

The upper ridge is forecast to weaken early next week as a trough develops over the Pacific NW and northern Rockies. Thus, relief from the heat should begin on Monday. Additional inland cooling is likely on Tuesday and Wednesday when models agree that southerly surface flow will develop near the coast, resulting in more efficient inland transport of marine air.

AVIATION. As of 10:31 PM PDT Wednesday . For 06z TAFs. Patchy cloud cover have moved over coastal terminals, though VFR conditions are still present and forecast through the TAF period; the exception still being near the Monterey Peninsula dropping to IFR later tonight. Onshore winds will prevail through the TAF period with lighter winds overnight and stronger winds Thursday afternoon, with stronger gusts possible, with widespread VFR.

Vicinity of KSFO . FEW cigs at 1200 ft AGL as KHAF is at MVFR. While a few clouds could spill over the Bay, there is low confidence in lower cigs at KSFO for tonight. Winds are still breezy and onshore, though lighter than earlier tonight. VFR is forecast on Thursday with stronger onshore winds with occasional gusts.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR already at KMRY with VFR elsewhere. IFR and even LIFR is possible for terminals closer to the coast. MVFR is expected farther inland with IFR possible. Winds remain onshore and breezy, but will ease overnight. Clouds should mix out by 18z for VFR, with stronger onshore winds Thursday afternoon.

MARINE. as of 2:21 AM PDT Thursday . Moderate northwest winds will continue through Friday. These winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels. Winds will begin to ease Friday night into Saturday as the high weakens but stronger winds may persist over the northern outer waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 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 until 3 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 5 PM



PUBLIC FORECAST: Dykema AVIATION: DK MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi53 min W 4.1 G 5.1 60°F 73°F1012.3 hPa
AAMC1 - 9414750 - Alameda, CA 19 mi53 min WSW 8 G 12 57°F 71°F1012.1 hPa
LNDC1 20 mi53 min SW 5.1 G 7 57°F 1011.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi53 min SW 13 G 15
OBXC1 22 mi53 min 57°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 22 mi53 min SW 8 G 9.9 56°F 1011.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi53 min SE 4.1 G 7 55°F 1010.9 hPa
PXSC1 23 mi53 min 57°F 53°F
FTPC1 - 9414290 - San Francisco, CA 26 mi53 min WSW 5.1 G 11 55°F 61°F1012.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi53 min S 13 G 17 57°F 1011.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi37 min SSW 15 54°F 1011 hPa
46237 - San Francisco Bar, CA (142) 31 mi53 min 53°F4 ft
RCMC1 - 9414863 - Richmond, CA 31 mi53 min S 11 G 15 56°F 64°F1011.3 hPa
UPBC1 36 mi53 min WNW 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi53 min NW 7 G 8.9 61°F 69°F1010.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi53 min WSW 11 G 12 59°F 1010.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi53 min SW 7 G 9.9 59°F 70°F1010 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi53 min NW 8.9 G 12 65°F 1009.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 39 mi163 min NW 9.7 G 14 53°F 1012.1 hPa51°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi163 min NW 14 G 18 56°F 53°F
SFXC1 - San Francisco Bay Reserve, CA 48 mi98 min WNW 8.9

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA5 mi48 minN 010.00 miFair57°F50°F77%1012.2 hPa
Mountain View, Moffett Field, CA9 mi53 minN 310.00 mi57°F51°F82%1011.8 hPa
Hayward, Hayward Air Terminal, CA10 mi89 minN 010.00 miFair58°F51°F78%1012.7 hPa
Oakland, Metro Oakland International Airport, CA13 mi30 minWSW 810.00 miA Few Clouds59°F52°F78%1012.3 hPa
San Francisco, San Francisco International Airport, CA13 mi87 minWNW 510.00 miA Few Clouds56°F50°F81%1011.7 hPa
San Jose, San Jose International Airport, CA16 mi30 minN 410.00 miFair58°F51°F78%1011.6 hPa
Half Moon Bay Airport, CA18 mi48 minN 05.00 miFog/Mist55°F50°F82%1013.2 hPa
Livermore, Livermore Municipal Airport, CA22 mi30 minWSW 410.00 miFair56°F50°F81%1011 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hr------------------------------3N34N4--N11N12N17N17
1 day ago--------------------------------454N9--N12N13N15
2 days ago------------------------------4Calm4N7N9NW15NW14NW15NW17

Tide / Current Tables for Redwood Creek, C.M. No.8, San Francisco Bay, California (2)
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Redwood Creek
Click for Map
Thu -- 03:20 AM PDT     7.68 feet High Tide
Thu -- 05:55 AM PDT     Sunrise
Thu -- 10:20 AM PDT     Moonset
Thu -- 10:40 AM PDT     -0.24 feet Low Tide
Thu -- 05:27 PM PDT     7.03 feet High Tide
Thu -- 08:32 PM PDT     Sunset
Thu -- 11:13 PM PDT     2.94 feet Low Tide
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.25.56.87.67.56.85.53.82.10.7-0.1-0.20.51.83.34.96.276.96.35.34.23.33

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Thu -- 01:37 AM PDT     1.24 knots Max Flood
Thu -- 04:54 AM PDT     -0.00 knots Slack
Thu -- 05:55 AM PDT     Sunrise
Thu -- 07:50 AM PDT     -1.43 knots Max Ebb
Thu -- 10:20 AM PDT     Moonset
Thu -- 11:18 AM PDT     0.00 knots Slack
Thu -- 02:34 PM PDT     1.63 knots Max Flood
Thu -- 06:37 PM PDT     -0.00 knots Slack
Thu -- 08:31 PM PDT     Sunset
Thu -- 08:34 PM PDT     -0.64 knots Max Ebb
Thu -- 11:20 PM PDT     0.00 knots Slack
Thu -- 11:49 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.21.210.5-0.1-0.7-1.3-1.4-1.2-0.8-0.20.51.21.61.61.410.4-0.2-0.6-0.6-0.4-0.1

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (6,6,7,8)
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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.