Tuesday, January21, 2020
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Marine Weather and Tides
Piedmont, 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 7:19AMSunset 5:20PM Tuesday January 21, 2020 5:34 AM PST (13:34 UTC) Moonrise 4:41AMMoonset 2:35PM Illumination 14% 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 203 Am Pst Tue Jan 21 2020
Today..S winds 10 to 20 kt. Rain.
Tonight..W winds around 5 kt. A chance of rain.
Wed..NE winds up to 10 kt.
Wed night..NE winds up to 10 kt.
Thu..NE winds up to 10 kt.
Thu night..NW winds up to 10 kt.
Fri..SW winds around 5 kt. A chance of rain.
Sat..S winds around 5 kt. Rain likely.
PZZ500 203 Am Pst Tue Jan 21 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect moderate to locally breezy southerly winds into this morning as a cold front approaches and moves through the waters today. A longer period northwest swell will build today before peaking mid week generating hazardous seas conditions for smaller vessels. Another long period northwest swell will then arrive later this week.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 211137 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 337 AM PST Tue Jan 21 2020

SYNOPSIS. Rain is forecast to spread from north to south across our area today as a weak weather system moves into northern California. Rainfall amounts will be light to locally moderate, with no significant weather impacts expected. Mostly dry and warmer conditions are then expected for the remainder of the work week, with rain likely to return over the upcoming weekend.

DISCUSSION. As of 3:00 AM PST Tuesday . Primary short-term forecast concerns are potential impacts from the incoming weather system. Given that precipitation will be mostly light and winds won't be a significant factor, the primary impacts will be wet roadways during the morning and afternoon/evening commutes. Current radar shows light rain just now beginning to move onshore in Sonoma County. This initial rainfall is associated with warm advection out ahead of the primary front that is still a ways offshore. Based on the latest HRRR and NAM, light rain will remain confined to the North Bay through the morning commute, and roads should remain dry from San Francisco southward through at least mid morning.

The primary frontal rain band is expected to arrive in the North Bay by mid morning, causing rain rates to increase somewhat. Rain will then spread south through most of the rest of the SF Bay Area during the late morning and afternoon hours as the front sags south. Light rain will finally reach the Monterey Bay Area by early evening. Areas that will most likely experience wet roadways during the afternoon/evening commute are the central and southern SF Bay Area as well as locations near Monterey Bay.

The NAM indicates that a couple of weak waves will develop offshore along the frontal boundary by late afternoon and early evening. This will result in the frontal boundary stalling across the South Bay and Monterey Bay Area from late afternoon through much of the overnight hours, and perhaps even until a few hours after sunrise Wednesday. However, the front is forecast to gradually dissipate overnight and so rain will mostly end by daybreak Wednesday.

Rain totals through tonight are forecast to be a half inch or less in most areas. The North Bay Mountains and Santa Cruz Mountains could see locally up to an inch of rain.

Dry conditions are forecast from Wednesday through Friday as upper level ridging over California deflects incoming Pacific systems to our north. The second half of the work week will also feature warming temperatures as H5 heights increase to 576 dm. High temperatures are forecast to be mostly in the 60s by Thursday and Friday. However, if persistent low clouds and fog develop around the Delta and locally into the North and East Bay Valleys, similar to what occurred over this past weekend, temperatures in those areas would remain in the 50s.

The consensus of longer range deterministic models, as well as model ensemble means, is for the next system to bring rain to the northern portion of our forecast area on Saturday and then south through the rest of our area by Sunday. This weekend system looks slightly stronger and wetter than today's system, but will not likely to have significant impacts. Dry weather is then expected to return by early next week.

AVIATION. as of 03:37 AM PST Tuesday . For 12z TAFs. Borderline VFR/MVFR conditions. Satellite imagery shows patchy low clouds beneath the higher clouds with observations reporting SCT to BKN cigs between 2,500 and 3,500 ft AGL with additional mid level clouds around 5,000 ft and high clouds around 15,000 to 20,000 ft AGL. The cold front remains offshore with radar showing showers across portions of the North Bay. Models have the main front reaching the Bay Area between mid morning and early afternoon before precip is expected to reach the Monterey Region in the early evening. Expect periods of MVFR/VFR conditions with occasional IFR cigs/vis possible during heavier showers. MVFR conditions then expected to prevail overnight tonight.

Models show an increase in 925 mb winds over the North Bay later this morning that may cause some LLWS with winds aloft between 30 to 35 kt. Expect increasing SE winds at the surface this morning ahead of the front with winds generally between 10 to 15 kt, occasional higher gusts may be possible. Do not have a good handle on the timing of winds transitioning to the SW/NW as models are inconsistent, but most agree that winds should at least ease by this evening.

Vicinity of KSFO . VFR borderline MVFR ceilings. Showers expected to arrive between around 17z-19z at which time MVFR cigs are then forecast to prevail into the evening. Showers to linger into tonight along with borderline MVFR cigs. SE winds early this morning generally less than 10 kt, but will likely at least some of the time reach or exceed 10 kt. SE winds to then increase later this morning with 10-15 kt winds expected to persist through the afternoon. Most guidance has SE/S winds continuing into this evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR-MVFR. Light SE winds this morning with locally breezy winds down the Salinas Valley. Showers to arrive in the early evening with MVFR cigs prevailing through the rest of the period.

MARINE. As of 2:03 AM PST Tuesday . Expect moderate to locally breezy southerly winds into this morning as a cold front approaches and moves through the waters today. A longer period northwest swell will build today before peaking mid week generating hazardous seas conditions for smaller vessels. Another long period northwest swell will then arrive later this week.

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 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



PUBLIC FORECAST: Dykema AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi47 min 51°F 1018.4 hPa
AAMC1 - 9414750 - Alameda, CA 7 mi47 min 52°F
OBXC1 7 mi47 min 51°F 49°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi47 min 51°F 1018.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi65 min SE 6 G 8.9
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi47 min 54°F 1018.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi47 min 51°F 1017.3 hPa
PXSC1 10 mi47 min 53°F 52°F
RCMC1 - 9414863 - Richmond, CA 11 mi47 min 52°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi36 min SE 7 51°F 1019 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi53 min 52°F 53°F1018.4 hPa
UPBC1 14 mi65 min SSE 6 G 8.9
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi47 min 50°F 1018.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi47 min 1018.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 17 mi47 min 49°F1018.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi47 min 1018.4 hPa
46237 - San Francisco Bar, CA (142) 22 mi35 min 53°F8 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi47 min 51°F 51°F1019 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi110 min ESE 1.9
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi25 min S 18 G 21 54°F 54°F1018.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi47 min 53°F1017.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi25 min S 14 G 19 54°F 55°F1018.9 hPa51°F

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi42 minESE 710.00 miOvercast52°F46°F80%1018.9 hPa
Concord, Buchanan Field, CA13 mi42 minSSE 310.00 miOvercast51°F44°F77%1016.9 hPa
Hayward, Hayward Air Terminal, CA14 mi41 minSSE 510.00 miPartly Cloudy50°F44°F80%1019.5 hPa
San Francisco, San Francisco International Airport, CA18 mi99 minSE 910.00 miMostly Cloudy52°F45°F77%1018.3 hPa
San Carlos Airport, CA22 mi40 minSE 510.00 miOvercast50°F46°F88%1019 hPa
Livermore, Livermore Municipal Airport, CA24 mi42 minE 610.00 miA Few Clouds46°F42°F86%1018.1 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrCalmCalmCalmS8SE6S5S4SE3SE4W6CalmCalmCalmCalmS3CalmS5S4CalmCalmE3E3E6SE7
1 day agoE6E8SE7SE7SE8SE8SE7S7SW6W3SW3CalmNE5E4CalmE4E8E8CalmNE5W5CalmCalmE5
2 days agoE7E5E3E6E6E8S6SW5W6NE8NE9NE11E7NE6E4E8SE6E6E7E9E7E6E7E5

Tide / Current Tables for Berkeley, 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 Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Tue -- 02:48 AM PST     0.00 knots Slack
Tue -- 04:41 AM PST     Moonrise
Tue -- 05:58 AM PST     0.82 knots Max Flood
Tue -- 07:20 AM PST     Sunrise
Tue -- 08:40 AM PST     -0.00 knots Slack
Tue -- 11:59 AM PST     -1.44 knots Max Ebb
Tue -- 02:36 PM PST     Moonset
Tue -- 03:56 PM PST     0.01 knots Slack
Tue -- 05:20 PM PST     Sunset
Tue -- 07:22 PM PST     1.14 knots Max Flood
Tue -- 10:27 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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-0.6-0.5-0.30.10.50.70.80.70.4-0.2-0.9-1.3-1.4-1.3-1.1-0.600.611.11.10.80.3-0.3

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 Sacramento, 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.