Friday, December13, 2019
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Marine Weather and Tides
Redwood 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 7:13AMSunset 4:52PM Friday December 13, 2019 4:32 AM PST (12:32 UTC) Moonrise 6:30PMMoonset 8:39AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 238 Am Pst Fri Dec 13 2019
Today..SW winds 5 to 10 kt. Patchy dense fog this morning. A chance of rain this morning, then rain likely this afternoon.
Tonight..W winds 5 to 15 kt. Rain likely.
Sat..W winds 5 to 15 kt.
Sat night..W winds 5 to 15 kt. A slight chance of rain.
Sun..NW winds around 5 kt.
Sun night..N winds around 5 kt.
Mon..NE winds up to 10 kt.
Tue..E winds 5 to 15 kt. A chance of rain.
PZZ500 238 Am Pst Fri Dec 13 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southerly winds will persist today ahead of a weak frontal boundary approaching the region. Winds will switch to the northwest tonight and increase on Saturday as a cool upper level trough passes to the north of the area. Large long-period northwest swell will impact the waters through Saturday.


7 Day Forecast for Marine Location Near Redwood City, CA
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location: 37.52, -122.2     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 131209 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 409 AM PST Fri Dec 13 2019

SYNOPSIS. Areas of dense fog will prevail across the coast and the coastal valleys this morning, with a disturbance spreading light rain across the region later today and tonight. The threat of light rain will continue into this weekend, as a cold front takes aim at Northern California. Drier and colder conditions will prevail on Sunday, with frost possible Sunday night. An unsettled and wet pattern will likely to return by the middle of next week.

DISCUSSION. As of 03:55 AM PST Friday . Water vapor imagery shows a dirty ridge over Northern California this morning, with plenty of high cloud cover spreading across the North Bay. Thus far, this high cloud cover is not impeding fog development across the North Bay, as all of our North Bay sites are currently reporting visibility at or below a quarter mile. Farther south, coastal areas and the coastal valleys are also dealing with this dense fog, including SFO. This dense fog will make for a nasty morning commute, with delays possible most of our airports. Therefore, a dense fog advisory remains in effect this morning through 8 am for all coastal regions and valleys.

Light rain will also gradually spread across the region today, as the next system takes aim at Northern California. In fact, radar is picking up on some light returns across northern Sonoma already, with a few sites reporting a hundredth here and there. The north half of the Bay Area will likely see the brunt of the rain over the next 24 hours, but amounts will remain light for the most. A cold front will then move across the region late in the day on Saturday. Although this cold front will bring some light rain to the region, the biggest impact will be with the colder and drier air moving in behind the front. Although Sunday will be slightly cooler than Saturday, the main impact will be on the overnight temperatures Sunday night. In fact, frosty conditions will be possible, as temperatures fall into the lower to mid 30s across the inland valleys.

Drier and warmer conditions will gradually develop for the first part of the work week, as high pressure builds over the West Coast. However, models continue to hint that a wet and unsettled pattern will return for the latter part of the work week. At this point in time, there are still some significant model differences in the timing and strength, but believe a more progressive pattern is likely looking to the ensembles. Palmer

AVIATION. as of 04:08 AM PST Friday . LIFR conditions are currently impacting most terminals across the San Francisco Bay Area and Monterey Bay Region with IFR ceilings over interior East Bay terminals. Low clouds and areas of dense fog will persist through about 15Z with improving conditions likely after 18Z. However, low ceilings will likely keep MVFR to IFR conditions through much of the day. A weak frontal system will then drop southward across the region resulting in light rain developing around 21Z over the North Bay, 00Z across the Bay Area and then 03Z for the Monterey Bay Region. Periods of lowering visibility and ceilings will also be possible during times of heavier precipitation. Precipitation should diminish region-wide by 06Z, yet worsening flight conditions are again likely to develop overnight through Saturday morning due to residual moisture and light winds in place.

Vicinity of KSFO . Patchy dense fog over the terminal will result in LIFR conditions through early morning with the potential improving visibilities and ceilings around 15Z and more so by 18Z. MVFR conditions are then likely through much of the remainder of the day with light rain likely to develop after 21Z. Generally light and variable winds are likely through this evening with an increase in west-northwest winds late in the period.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . LIFR conditions impacting regional terminals with patchy dense fog and low ceilings. Light winds also persist and will likely continue through much of the day. Conditions should improve after 18Z to IFR/MVFR with the potential for light rain to develop around 03Z.

MARINE. as of 04:08 AM PST Friday . Southerly winds will persist today ahead of a weak frontal boundary approaching the region. Winds will switch to the northwest tonight and increase on Saturday as a cool upper level trough passes to the north of the area. Large long-period northwest swell will impact the waters through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Dense Fog Advisory . CAZ006-505-506-509-528>530 High Surf Advisory . CAZ006-505-509-529-530 SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 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: Palmer AVIATION: RGass MARINE: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 1 mi51 min WNW 6 G 6 56°F 58°F1024.3 hPa
AAMC1 - 9414750 - Alameda, CA 18 mi45 min 55°F
LNDC1 19 mi51 min SSW 4.1 G 4.1 55°F 1024.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi57 min S 2.9 G 5.1
OBXC1 21 mi51 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi51 min SW 1.9 G 2.9 55°F 1024.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi45 min NW 1.9 G 4.1 54°F 1023.2 hPa
PXSC1 22 mi45 min 55°F 55°F
FTPC1 - 9414290 - San Francisco, CA 24 mi57 min W 2.9 G 4.1 53°F 55°F1024.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi45 min SW 2.9 G 4.1 56°F 1024.5 hPa
46237 - San Francisco Bar, CA (142) 29 mi63 min 55°F10 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi46 min Calm 53°F 1025 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi45 min 55°F
UPBC1 36 mi45 min WNW 6 G 7
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi45 min W 5.1 G 6 54°F 54°F1023.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi45 min NW 4.1 G 4.1 54°F 1023.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi45 min SW 4.1 G 6 55°F 53°F1023.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi33 min N 1.9 G 3.9 53°F 56°F1024.5 hPa (-1.2)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 38 mi33 min N 3.9 G 7.8 53°F 57°F1024.6 hPa52°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi45 min WSW 1.9 G 4.1 56°F 1023.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi108 min W 2.9 52°F 1024 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA3 mi38 minNW 34.00 miFog/Mist55°F55°F100%1024.4 hPa
Hayward, Hayward Air Terminal, CA11 mi39 minW 41.00 miFog/Mist56°F54°F93%1025 hPa
San Francisco, San Francisco International Airport, CA11 mi97 minN 00.25 miFog56°F53°F90%1023.7 hPa
Oakland, Metro Oakland International Airport, CA12 mi40 minN 00.75 miFog/Mist56°F54°F93%1024.3 hPa
Half Moon Bay Airport, CA16 mi38 minNNE 30.25 miFog52°F51°F100%1024.4 hPa
San Jose, San Jose International Airport, CA18 mi40 minWNW 32.50 miFog/Mist58°F55°F93%1023.6 hPa
Livermore, Livermore Municipal Airport, CA24 mi40 minNW 33.00 miFog/Mist57°F55°F93%1023.3 hPa

Link to 5 minute data for KSQL

Wind History from SQL (wind in knots)
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Last 24hrCalmCalm3NE3Calm--NE5NE7N4CalmCalmNW7W53CalmCalmCalmNW3NW4W3NE3NE3CalmCalm
1 day agoCalmCalmCalm4Calm3--N4CalmN33CalmSE6SE10--3S3SE9S6S7S4CalmCalmCalm
2 days agoCalmCalmCalmE6E43333N5CalmCalm--------E7CalmCalmCalmE3S3CalmCalm

Tide / Current Tables for Redwood Creek entrance (inside), San Francisco Bay, California
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Redwood Creek entrance (inside)
Click for Map
Fri -- 02:06 AM PST     6.85 feet High Tide
Fri -- 06:58 AM PST     3.05 feet Low Tide
Fri -- 07:14 AM PST     Sunrise
Fri -- 08:39 AM PST     Moonset
Fri -- 12:32 PM PST     8.51 feet High Tide
Fri -- 04:51 PM PST     Sunset
Fri -- 06:29 PM PST     Moonrise
Fri -- 07:56 PM PST     -0.98 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.26.46.86.55.64.43.43.13.54.66.17.48.48.47.76.34.42.30.5-0.6-1-0.40.82.4

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Fri -- 03:11 AM PST     -0.00 knots Slack
Fri -- 04:55 AM PST     -0.60 knots Max Ebb
Fri -- 07:12 AM PST     0.00 knots Slack
Fri -- 07:14 AM PST     Sunrise
Fri -- 08:38 AM PST     Moonset
Fri -- 10:41 AM PST     1.35 knots Max Flood
Fri -- 01:45 PM PST     -0.00 knots Slack
Fri -- 04:50 PM PST     Sunset
Fri -- 05:02 PM PST     -1.79 knots Max Ebb
Fri -- 06:29 PM PST     Moonrise
Fri -- 08:31 PM PST     0.00 knots Slack
Fri -- 11:48 PM PST     1.86 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.30.80.1-0.4-0.6-0.4-0.10.30.81.31.310.5-0.2-0.9-1.5-1.8-1.6-1.1-0.40.41.21.7

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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