Saturday, July11, 2020
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Marine Weather and Tides
Colma, 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 5:56AMSunset 8:34PM Saturday July 11, 2020 1:29 PM PDT (20:29 UTC) Moonrise 11:43PMMoonset 11:17AM Illumination 62% Phase: Waning Gibbous; Moon at 21 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- 903 Am Pdt Sat Jul 11 2020
Today..SW winds 10 to 20 kt.
Tonight..SW winds 5 to 15 kt.
Sun..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 20 kt with gusts up to 25 kt.
Mon..SW winds 15 to 25 kt with gusts up to 30 kt.
Mon night..SW winds 10 to 20 kt with gusts up to 30 kt.
Tue..SW winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt with gusts up to 25 kt.
PZZ500 903 Am Pdt Sat Jul 11 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate locally gusty northwest winds through the weekend. These winds will generate steep fresh wind driven northwest swell which will result in hazardous conditions for small craft vessels in the coastal waters. Otherwise, a light longer period south swell will be mixed in with the steep fresh northwest swell.


7 Day Forecast for Marine Location Near Colma, CA
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location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 111743 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1043 AM PDT Sat Jul 11 2020

SYNOPSIS. High pressure will dominate the weather pattern over the region this weekend resulting in very warm temperatures across the interior. Continued onshore flow will keep conditions near the coast cooler, yet still mild. A subtle cooling trend is on track to occur early next week.

DISCUSSION. as of 09:16 AM PDT Saturday . Low clouds and fog have begun to dissipate this morning along the coast, with patchy areas primarily over Santa Cruz county, Marin County, and the San Francisco Peninsula. Pressure gradient between SFO and ACV remained steady at around 5mb, indicative of our compressed marine layer. Fort Ord Profiler captured the shallow layer overnight, with some recovery this morning before going back to its gradual dissipation. As of this morning the most notable patch of the marine layer is a small, but growing marine layer deck due west of the San Francisco Peninsula. Expect that area to be the deepest spot for the marine layer along the CWA coastline today. In terms of temperatures and humidity overnight, RH values over higher terrain locations primarily along the East and North Bay were fairly low, with similar conditions expected Saturday night owing to the upper-level ridge setup.

The 590dm 500mb ridge over the Southwestern US has continued its expansion and will be the primary driver for our weather this weekend. Mild conditions are expected along the coast owing to greater diurnal heating as the marine layer influence remains low, while interior locations from Hollister up to Napa Valley will reach well over 90 degrees today. Some isolated areas can also expect to hit and surpass the 100 degree mark this afternoon.

Weak onshore flow is expected tonight, which will likely result in poor humidity recoveries in areas and overnight lows ranging between 60s and low 70s along our interior, especially in our higher elevations.

Sunday will be our warmest day, with mild coastal temperatures along with hot interior temperatures expected. Temps along the coast will land within the 65-75 F range while some of our interior locations should expect to reach the mid-90s. Moreover,some areas across the interior could easily experience highs in the 100-105 F range. Thankfully, models are suggesting there will be weak offshore flow owing to the stable conditions from the upper-level ridge. Nevertheless, the poor humidity recoveries along with the warmth this weekend will still result in elevated fire weather and heat concerns, especially for Sunday.

Looking ahead into next week, heights will fall across the CWA as the upper-level ridge weakens and allows for the intrusion of a disturbance off the Pacific into BC. Temperatures will return closer to seasonal averages by the first half of next week as a result. This disturbance will also allow for the marine layer to recover, bringing coastal locations back to their seasonal averages as well. Expect the main setup for next week to be the gradual shift in our upper-level setup as the ridge weakens and makes its way out of the southwest as this trough takes over.

AVIATION. as of 10:45 AM PDT Saturday . Widespread VFR with only a few hints of the marine layer left along the Marin headlands and offshore of the San Francisco Peninsula. Generally light onshore winds are prevailing this morning but will give way to moderate onshore winds, particularly through coastal gaps such as near KSFO, through the remainder of the day. For tonight, a compressed marine layer may bring a few clouds along the coast and bayshore, but otherwise VFR is expected. Tomorrow will see similar moderate onshore winds and VFR conditions as well.

Vicinity of KSFO . VFR, west to northwest wind increasing to 20 to 25 knots by early afternoon. Gusts should be infrequent but may approach 30kt if they develop. Wind easing tonight and Sunday morning but pick up again Sunday afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR today. Calm winds shifting to west to northwest 10 to 15 knots by early afternoon. Generally VFR tonight though a few patches of low BKN/OVC clouds may develop late into the night for a few hours near KMRY/KWVI.

MARINE. as of 10:38 AM PDT Saturday . Moderate locally gusty northwest winds through the weekend. These winds will generate steep fresh wind driven northwest swell which will result in hazardous conditions for small craft vessels in the coastal waters. Otherwise, a light longer period south swell will be mixed in with the steep fresh northwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: Diaz/MM AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi59 min SSW 4.1 G 7 71°F 1015.9 hPa
PXSC1 9 mi59 min 70°F 54°F
AAMC1 - 9414750 - Alameda, CA 9 mi59 min W 6 G 7 69°F 71°F1016.9 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi59 min W 8.9 G 14 58°F 64°F1017.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi59 min W 5.1 G 7
OBXC1 10 mi59 min 65°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi59 min NW 9.9 G 11 62°F 1016.9 hPa
LNDC1 11 mi59 min WNW 4.1 G 7 71°F 1016.8 hPa
46237 - San Francisco Bar, CA (142) 14 mi89 min 60°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi43 min SSE 11 69°F 1016 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi59 min NNW 7 G 8.9 73°F 74°F1017.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi59 min SSW 9.9 G 14 62°F 1017.2 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi59 min S 5.1 G 7 66°F 66°F1016.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi49 min NW 14 G 18 53°F 54°F1018.3 hPa52°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi59 min W 7 G 8.9 73°F 1016 hPa
UPBC1 29 mi59 min NW 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi59 min NW 12 G 14 80°F 71°F1015.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 33 mi59 min W 11 G 12 80°F 71°F1015.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi49 min NNW 18 G 21 55°F 1018.8 hPa53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi59 min NW 8.9 G 12 83°F 1015.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi104 min WSW 5.1

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi33 minNW 1510.00 miA Few Clouds74°F52°F46%1016.3 hPa
Oakland, Metro Oakland International Airport, CA11 mi36 minWNW 1110.00 miFair78°F55°F47%1016.5 hPa
Half Moon Bay Airport, CA12 mi34 minNW 85.00 miFair with Haze61°F53°F77%1018.3 hPa
San Carlos Airport, CA14 mi42 minWNW 610.00 miClear79°F55°F45%1016.6 hPa
Hayward, Hayward Air Terminal, CA16 mi35 minW 710.00 miFair81°F54°F39%1017 hPa
Palo Alto Airport, CA21 mi1.7 hrsN 610.00 miClear75°F57°F54%1016.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrNW17NW16NW17NW17NW15NW16NW18NW18NW13NW12NW10NW11NW9NW8NW8NW6NW6W9NW8NW7NW11NW10NW14NW15
1 day agoNW16NW21NW21NW20NW20NW22
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W24NW15NW18NW18NW15NW16NW13NW14NW11NW9NW7NW12NW11NW13NW13NW15NW15
2 days agoNW17NW21NW19W16NW13NW15W18W14W14W12W11NW3NW5NW5NW6NW6NW5NW3CalmNE4NE5NE4NW10NW12

Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Sat -- 12:17 AM PDT     Moonrise
Sat -- 04:47 AM PDT     5.64 feet High Tide
Sat -- 05:57 AM PDT     Sunrise
Sat -- 11:32 AM PDT     0.76 feet Low Tide
Sat -- 12:16 PM PDT     Moonset
Sat -- 06:26 PM PDT     6.32 feet High Tide
Sat -- 08:32 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.633.84.75.45.65.34.53.52.31.40.80.81.42.43.64.85.76.36.25.74.93.93

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Sat -- 12:17 AM PDT     Moonrise
Sat -- 02:30 AM PDT     0.51 knots Max Flood
Sat -- 05:22 AM PDT     -0.00 knots Slack
Sat -- 05:57 AM PDT     Sunrise
Sat -- 08:39 AM PDT     -0.91 knots Max Ebb
Sat -- 11:59 AM PDT     0.00 knots Slack
Sat -- 12:16 PM PDT     Moonset
Sat -- 03:11 PM PDT     0.77 knots Max Flood
Sat -- 06:37 PM PDT     -0.00 knots Slack
Sat -- 08:32 PM PDT     Sunset
Sat -- 09:24 PM PDT     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.30.50.50.40.1-0.2-0.6-0.9-0.9-0.7-0.400.40.60.80.70.60.3-0.2-0.5-0.7-0.7-0.5

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 (16,3,4,5)
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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.