Tuesday, December10, 2019
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Marine Weather and Tides
Foster City, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:11AMSunset 4:52PM Tuesday December 10, 2019 2:12 AM PST (10:12 UTC) Moonrise 4:04PMMoonset 5:32AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 208 Am Pst Tue Dec 10 2019
Today..N winds around 5 kt, becoming nw this afternoon. Patchy fog this morning.
Tonight..NE winds around 5 kt. A chance of rain.
Wed..NE winds around 5 kt. A slight chance of rain.
Wed night..N winds around 5 kt.
Thu..SE winds around 5 kt. A slight chance of rain.
Thu night..W winds around 5 kt.
Fri..W winds up to 10 kt.
Sat..NW winds 5 to 15 kt. A chance of rain.
PZZ500 208 Am Pst Tue Dec 10 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds will persist over the coastal waters as a weak system approaches. A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Foster City, CA
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location: 37.55, -122.24     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 100603 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1003 PM PST Mon Dec 9 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through Tuesday afternoon. Patchy dense fog is likely during the night and morning hours. A weak weather system may produce light rain from late Tuesday into early Wednesday. Dry conditions are then forecast for most of the second half of the work week before rain chances increase by Friday night or Saturday.

DISCUSSION. as of 9:43 PM PST Monday . GOES-17 night-time microphysics imagery and metar observations show low clouds cover much of the Bay Area this evening. An exception is a recent report from Byron of 1/4 mile visibility in fog, however fog has since lifted there. High clouds offshore continue to drift toward land and will thicken tonight and Tuesday morning. 24 hour trends show most places are either the same or one to three degrees milder while dew point temperatures have decreased a few degrees; a signature of less radiative cooling at the surface due to low clouds and upward displacement of water vapor per decreased surface dew point temperatures mostly supporting low clouds compared to this time last evening. Outgoing radiative cooling necessary for fog to form is lacking at the moment. Decided to scale back fog in the forecast grids by a few hours. Still thinking at least patchy fog will develop overnight and Tuesday morning, however the midnight shift may need scale back fog coverage in the grids a bit more if low and high clouds thicken and persist. Based on recent temperature guidance and persistence of cloud cover decided to bump up low temperatures for Tuesday morning by a few degrees.

For additional information on the forecast please see the previous discussion.

PREV DISCUSSION. as of 12:55 PM PST Monday . Fog blanketed a good portion of the San Francisco Bay Area and parts of the central California coast this morning. Many airports throughout the region reported visibilities down to 1/4 mile or less. By mid-morning, the severity of the fog had gradually improved, allowing for the Dense Fog Advisory to expire as scheduled at 10 AM PST. With that said, though, as of mid-day overcast skies and locally-reduced visibilities are still being observed. Some locations may never clear this afternoon. With the high-amplitude upper level ridge over our area, will likely see a repeat overnight tonight and into Tuesday morning with fog impacting the area valleys and locations near sea level. Will monitor visibility trends closely and let the evening or night shift make the determination about any new Dense Fog Advisories.

The upper level ridge will quickly push eastward into the North American continent during the day on Tuesday. A fast-moving shortwave trough will then approach the California coast late Tuesday and into Wednesday. The precipitation associated with this shortwave will be light. Best potential for more than a few tenths of an inch of rain will be in the North Bay. The latest 3-km NAM brings around a tenth to a quarter of an inch to San Francisco and the East Bay with lesser amounts in the Santa Clara Valley. The timing of this rain looks to fall in the middle to late evening hours on Tuesday, wrapping up early to middle morning Wednesday. Some locations in Monterey and San Benito County will likely remain dry. Overall, low impacts are anticipated.

A broad, flat upper level ridge in the eastern Pacific between 20 and 30 degrees north latitude will largely push the core storm track to our north from the middle of the week onward. Models advertise a strong system to impact the Pacific Northwest and British Columbia late Wednesday and into Thursday. The North Bay will be on the far southern end of this system with the potential for light rain on Thursday or Friday. Little rainfall (if any) is expected south of the Golden Gate based on the latest guidance. Again, little or no weather-related impacts anticipated in our area.

And behind the late week system comes another shortwave trough over the weekend. Models have backed off a bit over the past several model runs in terms of rainfall totals, indicating a few or several tenths of an inch of rain. If the forecast plans out, little or no weather-related impacts are expected this this system as well.

Looking ahead to late this weekend and into early next week, both the GFS and ECMWF bring a ridge back to the West Coast. While this week from a synoptic meteorological aspect is rather active, the overall rain impacts from the series of successive systems will likely remain low for the San Francisco Bay Area.

AVIATION. as of 10:00 PM PST Monday . For 06z TAFs. A low stratus deck sits over the Bay Area and the Central Coast providing mostly MVFR conditions at local terminals. Unstable air near the surface has prevented any low clouds/fog from developing early, like it did last night. FG messaging in the TAFs have been mostly removed to account for the lower confidence event; however, low cigs and reduced vis on approaches are still forecast at this time for early Tuesday morning. Clouds can still be expected to lift in the afternoon, but remain ahead of the approaching system. That system brings chances for rain as it moves in from northwest heading southeast.

Vicinity of KSFO . MVFR conditions remain as stratus clouds linger between 1,200 and 2200 feet. Cigs are still expected to lower in the early morning hours and vis can be reduced on approaches. Patchy fog is possible, but with lower confidence than the previous TAF issuance. By about 20z, clouds should lift slightly, but remain ahead of the next system moving into the area. Light rain is forecast tomorrow after 00z, first in the North Bay, and then reaching terminals in the broader Bay Area.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Stratus sits over the peninsula providing MVFR conditions. Cigs will lower and vis is forecast to be reduced. Patchy fog is possible, but lower cigs and reduced vis is still expected Tuesday morning. Clouds lift in the afternoon around 20z and winds remain light.

MARINE. as of 09:48 PM PST Monday . Northwest winds will continue to be light over the coastal waters tonight and into Tuesday morning. Patchy fog is possible Tuesday morning. A weak system approaches from the northwest moving toward San Francisco Tuesday night, bringing a chance of showers in the evening and into Wednesday while winds turn southerly. The moderate northwest swell will continue through the end of the week before a larger and longer period northwest swell arrives closer to the weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.

PUBLIC FORECAST: Canepa/Rowe AVIATION: DK MARINE: DK

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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 mi54 min ESE 1.9 G 4.1 1023.7 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi54 min 55°F
LNDC1 17 mi54 min Calm G 1 1023.4 hPa
OBXC1 18 mi54 min 52°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 19 mi54 min N 1.9 G 1.9 1023.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi60 min ESE 4.1 G 4.1 53°F 1022.4 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi60 min NE 6 G 7 53°F 54°F1023.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi60 min SSE 1.9 G 4.1 53°F 1023.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 26 mi61 min SE 1.9 52°F 1024 hPa
46237 - San Francisco Bar, CA (142) 27 mi42 min 54°F3 ft
RCMC1 - 9414863 - Richmond, CA 27 mi54 min 55°F
UPBC1 34 mi60 min NW 1 G 1.9
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi60 min NNW 1.9 G 1.9 51°F 54°F1023.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi32 min NW 1.9 G 3.9 54°F 56°F1024.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi60 min SSE 1.9 G 2.9 51°F 1023.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 37 mi54 min WNW 5.1 G 6 53°F1023 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi32 min W 3.9 G 7.8 54°F 57°F1024.2 hPa48°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi60 min NNW 5.1 G 5.1 50°F 1023.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi87 min N 1.9 43°F 1023 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA1 mi17 minN 010.00 miOvercast52°F48°F88%1023.7 hPa
San Francisco, San Francisco International Airport, CA8 mi16 minN 010.00 miFair54°F46°F75%1023.5 hPa
Hayward, Hayward Air Terminal, CA10 mi18 minN 010.00 miOvercast50°F46°F86%1024.4 hPa
Oakland, Metro Oakland International Airport, CA10 mi19 minN 010.00 miMostly Cloudy51°F45°F80%1023.8 hPa
Half Moon Bay Airport, CA14 mi17 minN 010.00 miOvercast48°F46°F94%1024 hPa
San Jose, San Jose International Airport, CA21 mi19 minN 010.00 miFair52°F46°F80%1023.4 hPa

Link to 5 minute data for KSQL

Wind History from SQL (wind in knots)
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Last 24hr--------Calm4Calm44444N5N5N4--------CalmCalmE4E6SW3
1 day ago--------CalmCalmCalmCalmN6N5N7NW4NW7W634NW6NW4Calm----------
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CalmCalm----------

Tide / Current Tables for Bay Slough, west end, San Francisco Bay, California
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Bay Slough
Click for Map
Tue -- 04:49 AM PST     2.40 feet Low Tide
Tue -- 05:32 AM PST     Moonset
Tue -- 07:12 AM PST     Sunrise
Tue -- 10:24 AM PST     8.35 feet High Tide
Tue -- 04:03 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 05:52 PM PST     -0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.34.33.32.62.434.35.97.48.38.27.56.14.32.40.8-0.1-0.40.21.32.84.35.5

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Tue -- 12:15 AM PST     -0.00 knots Slack
Tue -- 02:51 AM PST     -0.92 knots Max Ebb
Tue -- 05:32 AM PST     Moonset
Tue -- 05:38 AM PST     0.00 knots Slack
Tue -- 07:12 AM PST     Sunrise
Tue -- 08:20 AM PST     1.33 knots Max Flood
Tue -- 11:30 AM PST     -0.01 knots Slack
Tue -- 03:06 PM PST     -1.84 knots Max Ebb
Tue -- 04:03 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 06:36 PM PST     0.01 knots Slack
Tue -- 09:25 PM PST     1.72 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.4-0.8-0.9-0.7-0.30.20.91.31.30.90.4-0.3-1-1.6-1.8-1.6-1.2-0.50.41.21.71.71.4

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 (5,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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