Tuesday, January28, 2020
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Marine Weather and Tides
Roseland, 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 7:18AMSunset 5:29PM Tuesday January 28, 2020 5:09 PM PST (01:09 UTC) Moonrise 9:43AMMoonset 9:16PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 223 Pm Pst Tue Jan 28 2020
.small craft advisory in effect through Wednesday evening...
Tonight..NW winds 10 to 15 kt. Wind waves 3 to 4 ft. W swell 11 to 13 ft at 14 seconds.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 10 to 12 ft at 14 seconds.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 13 seconds.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 15 seconds.
Thu night..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 9 to 11 ft at 16 seconds.
Fri..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft at 15 seconds.
Fri night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 7 to 9 ft at 14 seconds.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 6 to 8 ft.
Sun..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 7 to 8 ft. W swell 9 to 11 ft.
PZZ500 223 Pm Pst Tue Jan 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak cold front continues to move through the coastal waters late this afternoon. Northerly winds will increase behind the front this evening and overnight. Increasing winds will result in steeper wind waves. Conditions will remain elevated through the work week. A long period northwest swell will arrive later this week.


7 Day Forecast for Marine Location Near Roseland, CA
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location: 38.43, -122.71     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 290050 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 450 PM PST Tue Jan 28 2020

SYNOPSIS. Conditions will continue to dry out the rest of the afternoon. Dry conditions will then persist region-wide through the remainder of the week along with a gradual warming trend. Cooling is then forecast by Sunday and into early next week.

DISCUSSION. as of 01:55 PM PST Tuesday . Satellite and radar imagery shows patchy clouds around the Bay Area along with some lingering showers associated with a weak frontal system. Overall, the North Bay received between a few hundredths to around two tenths of an inch while the Bay Area received a few hundredths to a tenth of an inch around Half Moon Bay. A few showers may linger around the Bay Area this afternoon before conditions dry out. Temperatures this afternoon are in the upper 50s and low 60s. Expect maybe a few degrees of additional warming this afternoon before temperatures begin to cool down for the evening.

As the mid/upper level system exits the region tonight, an upper ridge will build over the eastern Pacific and inland tomorrow through the rest of the week. This will allow for continued dry conditions as well as a gradual warming trend. Many locations will reach the mid to upper 60s on Thursday with portions of the interior in the low 70s on Friday. More widespread low to mid 70s are possible on Saturday as warming peaks. This will bring many areas around 5 to 10 degrees above seasonal normals. Models still show 850 mb temperatures reaching about 13 to 16 deg C Friday and Saturday. To put this in perspective, SPC sounding climatology shows the maximum 850 mb temperatures for KOAK in early February at around 17 deg C.

Temperatures will quickly cool on Sunday and into early next week as a broad upper trough sets up over the Western U.S. Both the GFS and ECMWF show a steep 24 hour drop in 850 mb temperatures with between 12 to 15 deg C forecast for Saturday afternoon and -1 to -2 deg C by Sunday afternoon. This will bring afternoon high temperatures down by about 5 to 7 or so deg F on Sunday with further cooling anticipated on Monday. Though models do show some precipitation with this system, it is likely to remain to our north and east. Longer range outlooks continue to look dry for much of the region into at least early February.

AVIATION. as of 4:50 PM PST Tuesday . For 00Z TAFs. A weak surface to lower level cool front from the San Mateo Coast to southern Napa county is moving southeastward late this afternoon generating mainly MVFR ceilings, though at times there have been very local IFR conditions on the coastline. The coastal terrain is also causing sluggishness in the forward motion of the front. Cooler air advection is primarily focusing at 925 mb which turns neutral tonight then warm air advection Wednesday; high res model output leans toward sufficiently drier air Wednesday supporting VFR, though will soon see if the 00z WRF shows the same. A marginal tightening of the 925 mb thermal gradient leading to later week warmer air as advertised could help cause patchy low clouds /MVFR ceilings/ Wednesday.

Jet stream cirrus and cirrostratus will continue to move in from the north tonight and early Wednesday morning as the north-south aligned jet advances slowly eastward from CA to NV. Areal coverage as well as thickness of higher clouds may offset the rate of boundary layer cooling, however will have to watch for possible low clouds and/or fog tonight into Wednesday morning.

Vicinity of KSFO . Regrowth of low clouds has occurred, 5 min obs show MVFR continuing with west wind at 10 knots. Cool front is weak though aloft at 925 mb it is remarkably aligned well with present location of low clouds seen on satellite. Model forecasts indicate a slow progression of the surface and lower level front to the southeast through this evening. Best can tell from recent high resolution model output some drying should arrive by mid evening helping to lift ceilings or even mix it out to scattered clouds. Low confidence if and how long low clouds return tonight, will monitor satellite and obs.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Still ahead of the cool front here, weak cool air advection then commences tonight thus for now VFR continues. Cloud ceilings forecast to lower tonight to MVFR though in spots IFR is possible due to combination convergence along the frontal boundary and night-time cooling of the boundary layer. High clouds with jet stream winds should mainly stay to our north for the most part tonight.

MARINE. as of 3:42 PM PST Tuesday . A weak cold front continues to move through the coastal waters late this afternoon. Northerly winds will increase behind the front this evening and overnight. Increasing winds will result in steeper wind waves. Conditions will remain elevated through the work week. A Long period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 9 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 SCA . Pt Reyes to Pigeon Pt 0-10 nm from 9 PM



PUBLIC FORECAST: AS AVIATION: Canepa MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 33 mi58 min 55°F1025.6 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 34 mi30 min NW 16 G 19 55°F1025.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi52 min SW 8.9 G 12 57°F 1024.8 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi52 min 54°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi71 min SSE 8 56°F 1026 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi85 min W 7
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi52 min SW 11 G 14 56°F 1025.6 hPa
UPBC1 41 mi52 min WSW 13 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi52 min SW 8.9 G 11
PCOC1 - 9415144 - Port Chicago, CA 44 mi52 min SW 5.1 G 8 59°F 52°F1024.6 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi58 min SW 5.1 G 11 55°F 54°F1025.7 hPa
46237 - San Francisco Bar, CA (142) 45 mi40 min 54°F7 ft
PXSC1 46 mi52 min 57°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi52 min WNW 5.1 G 7 55°F 1025.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi30 min WNW 9.7 G 14 55°F 55°F1026.5 hPa
OBXC1 47 mi52 min 56°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 47 mi52 min WSW 5.1 G 9.9 56°F 1024.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 48 mi52 min WSW 5.1 G 6
LNDC1 49 mi52 min WSW 4.1 G 6 57°F 1025.6 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA8 mi77 minWSW 79.00 miA Few Clouds59°F46°F62%1024 hPa
Petaluma Municipal Airport, CA13 mi75 minVar 6 G 1110.00 miMostly Cloudy57°F53°F88%1025.7 hPa
Novato / Gnoss Field, CA21 mi75 minNW 5 G 1110.00 miFair59°F48°F68%1025.4 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrSW4CalmS3W4SE3W4CalmCalmCalmCalmCalmSE6S5S3S5SE4CalmCalmSW3W7W8W9SW7SW7
1 day agoW7NW4W3CalmCalmCalmSE3CalmW3CalmCalmCalmCalmCalmCalmCalmCalmSE3CalmCalmS4SW8W9W7
2 days agoS5S5CalmSE3CalmS4CalmSW3S5SE5SE7S5S4SW5SW4CalmW6W10W10
G17
W7W9N6N8W7

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
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Tue -- 04:29 AM PST     5.84 feet High Tide
Tue -- 07:18 AM PST     Sunrise
Tue -- 09:41 AM PST     Moonrise
Tue -- 10:38 AM PST     2.15 feet Low Tide
Tue -- 03:24 PM PST     6.13 feet High Tide
Tue -- 05:28 PM PST     Sunset
Tue -- 09:15 PM PST     Moonset
Tue -- 10:55 PM PST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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12.43.855.85.85.34.53.52.72.22.22.945.366.15.64.73.52.21.20.50.3

Tide / Current Tables for Lakeville, Petaluma River, San Pablo Bay, California
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Lakeville
Click for Map
Tue -- 04:18 AM PST     5.59 feet High Tide
Tue -- 07:18 AM PST     Sunrise
Tue -- 09:41 AM PST     Moonrise
Tue -- 10:18 AM PST     2.15 feet Low Tide
Tue -- 03:13 PM PST     5.87 feet High Tide
Tue -- 05:28 PM PST     Sunset
Tue -- 09:15 PM PST     Moonset
Tue -- 10:35 PM PST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.32.63.955.65.54.94.13.22.52.22.33.14.25.35.85.75.24.231.80.90.40.4

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 (20,4,5,8)
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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.