Thursday, January23, 2020
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Marine Weather and Tides
Moss Beach, 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 5:24PM Thursday January 23, 2020 11:23 AM PST (19:23 UTC) Moonrise 6:36AMMoonset 4:24PM Illumination 2% Phase: Waning Crescent; Moon at 28 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 832 Am Pst Thu Jan 23 2020
Today..NE winds 5 to 15 kt, becoming nw this afternoon. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 12 seconds.
Tonight..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 13 seconds and W 2 to 3 ft at 21 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft at 13 seconds and W 5 to 7 ft at 21 seconds.
Fri night..NW winds up to 10 kt. Wind waves 1 ft. W swell 9 to 11 ft at 18 seconds. A slight chance of rain.
Sat..SW winds up to 10 kt. Wind waves 1 ft. W swell 8 to 10 ft at 16 seconds. A slight chance of rain.
Sat night..S winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 15 seconds. Rain likely.
Sun..NW winds up to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft.
Mon..W winds up to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 8 ft with a dominant period of 12 seconds. Across the bar...seas 6 to 9 ft with a dominant period of 12 seconds. Maximum ebb current of 3.3 kt at 03:13 pm Thursday and 1.8 kt at 04:01 am Friday.
PZZ500 832 Am Pst Thu Jan 23 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will generally be offshore and locally breezy near coastal gaps this afternoon. A long period wnw swell will begin to move into the waters later today, peaking on Friday and Saturday. A coastal jet with northerly winds will develop along the big sur coast by Friday afternoon, generating small craft advisory winds there. The next storm approaches later Saturday into Sunday with increasing southerly winds followed by another large northwest swell behind the front Sunday into Monday.


7 Day Forecast for Marine Location Near Moss Beach CDP, CA
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location: 37.51, -122.56     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 231732 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 932 AM PST Thu Jan 23 2020

SYNOPSIS. Mainly dry weather conditions along with a gradual warming trend is expected through Friday. A weak storm system moving into Northern California will bring a chance of precipitation to the region this upcoming weekend.

DISCUSSION. as of 9:24 AM PST Thursday . Satellite imagery shows a lot of high clouds streaming over the state at this time, but even so, current temperature readings are running several degrees cooler than at yesterday at this time. Temps are ranging from the lower 40s to around 50 at area airports. Current observations also only indicate a few sites picking up patchy fog. Livermore is reporting 6 miles in patchy fog. On tap for today and Friday, filtered sunshine and mild high temps ranging from the upper 50s to mid 60s.

High pressure aloft will dominate the weather pattern over the next couple of days. The tail end of a weak system could touch off some showers across far northern Sonoma County tonight, but not much precipitation is expected. The upper level ridge will rebuild Friday into Saturday. Saturday will be another mild day across the Bay Area.

Rain chances will return over the weekend as a slightly stronger frontal boundary moves through the region. Rain chances initially begin across the North Bay on Saturday, before slowly moving southward by Sunday. Forecast rainfall amounts will generally be a few hundredths to possibly three quarters of an inch in the North Bay. Daytime temperatures will lower from Saturday to Sunday with upper 50s to lower 60s.

By early next week a ridge will rebuild over the west shunting the storm track farther north again resulting in a mostly dry forecast for our area. The tail end of a few storms may bring low end rain chances to the extreme northern part of the North Bay at times next week, but that is all.

AVIATION. as of 9:32 AM PST Thursday . For 18Z TAFs. Mid and high clouds continue to stream over the San Francisco Bay Area this morning, which helped limit the fog development compared to 24 hours ago. VFR conditions are forecast to prevail today with the passing SCT/BKN/OVC high clouds. These high cloud bases are expected to gradually lower over the next 12 to 24 hours as northern California will be on the southern extent of a system targeting the Pacific Northwest. Could see some MVFR/IFR ceilings (and possibly visibilities) by daybreak Friday along with the slight chance of showers from SFO north. Winds are forecast to be relatively light.

Vicinity of KSFO . VFR conditions are forecast to prevail today. Light easterly winds this morning will become west/northwest late in the day. Increasing mid/high clouds will stream over the area today with cloud bases gradually lowering through the afternoon and overnight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions are forecast to prevail today at MRY and SNS. Offshore winds this morning will reverse and become onshore this afternoon. While communication problems persist with the SNS ASOS, the ASOS is still continuing to make observations.

MARINE. as of 8:32 AM PST Thursday . Winds will generally be offshore and locally breezy near coastal gaps this afternoon. A long period WNW swell will begin to move into the waters later today, peaking on Friday and Saturday. A coastal jet with northerly winds will develop along the Big Sur coast by Friday afternoon, generating small craft advisory winds there. The next storm approaches later Saturday into Sunday with increasing southerly winds followed by another large northwest swell behind the front Sunday into Monday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. NONE.



PUBLIC FORECAST: Sims AVIATION: Rowe MARINE: Rowe

Visit us at www.weather.gov/sanfrancisco

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi53 min 54°F 53°F1024.7 hPa
46237 - San Francisco Bar, CA (142) 19 mi53 min 53°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi33 min E 3.9 G 5.8 55°F 55°F7 ft1024.1 hPa53°F
FTPC1 - 9414290 - San Francisco, CA 21 mi53 min 53°F 53°F1024.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi33 min E 9.7 G 14 55°F 54°F6 ft1024.5 hPa
PXSC1 22 mi53 min 54°F 52°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi53 min 53°F 1023.3 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi53 min 52°F 52°F1024.3 hPa
OBXC1 23 mi53 min 54°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi71 min SW 4.1 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi53 min 53°F 1024.3 hPa
LNDC1 25 mi53 min 53°F 1024.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi42 min NW 7 53°F 1024 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi53 min 57°F 1024.5 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi53 min 55°F 53°F1023.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi53 min 53°F1023.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi53 min 51°F 1024.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi53 min 50°F 50°F1024.9 hPa
UPBC1 43 mi65 min E 4.1 G 5.1
PCOC1 - 9415144 - Port Chicago, CA 47 mi53 min 50°F 49°F1024.6 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi28 minNW 38.00 miFair57°F50°F77%1023.7 hPa
San Francisco, San Francisco International Airport, CA13 mi27 minE 49.00 miMostly Cloudy55°F48°F77%1024 hPa
San Carlos Airport, CA16 mi36 minVar 38.00 miMostly Cloudy54°F50°F88%1024.7 hPa
Oakland, Metro Oakland International Airport, CA22 mi30 minE 710.00 miMostly Cloudy59°F48°F69%1024.2 hPa
Palo Alto Airport, CA23 mi36 minVar 310.00 miMostly Cloudy54°F48°F82%1024.4 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrN3N4N6N7N4N5W9W6W4N3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3SE4E3SE3E4
1 day agoS10
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SE9SE12SE6SE5SE4SE5SE6SE6E5N5N6NE3CalmN4CalmN3N3N5NE6NE5
2 days agoE5E5E4E3CalmE3S7S5S7S6S8S7S9SE9SE7SE8SE9SE6SE6E6SE8E9S6S9

Tide / Current Tables for Princeton, Half Moon 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 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
Thu -- 02:31 AM PST     -0.61 knots Max Ebb
Thu -- 05:02 AM PST     0.00 knots Slack
Thu -- 06:36 AM PST     Moonrise
Thu -- 07:19 AM PST     Sunrise
Thu -- 08:03 AM PST     0.83 knots Max Flood
Thu -- 10:53 AM PST     -0.01 knots Slack
Thu -- 02:31 PM PST     -1.49 knots Max Ebb
Thu -- 04:23 PM PST     Moonset
Thu -- 05:22 PM PST     Sunset
Thu -- 06:01 PM PST     0.00 knots Slack
Thu -- 09:21 PM PST     1.18 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.4-0.6-0.6-0.4-00.40.70.80.70.4-0.1-0.7-1.2-1.5-1.5-1.2-0.7-00.611.21.10.8

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 (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.