Thursday, December12, 2019
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Marine Weather and Tides
Milpitas, 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 4:51PM Thursday December 12, 2019 5:44 AM PST (13:44 UTC) Moonrise 5:33PMMoonset 7:37AM Illumination 99% Phase: Full Moon; 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 219 Am Pst Thu Dec 12 2019
Today..S winds around 5 kt, becoming W this afternoon. A chance of rain.
Tonight..NW winds around 5 kt. A chance of rain.
Fri..SW winds up to 10 kt. Patchy fog. A chance of rain.
Fri night..W winds 5 to 10 kt. A chance of rain.
Sat..NW winds 5 to 10 kt. A slight chance of rain.
Sat night..W winds around 10 kt.
Sun..NW winds up to 10 kt.
Mon..NE winds 5 to 10 kt. A chance of rain.
PZZ500 219 Am Pst Thu Dec 12 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light southerly winds will prevail through Thursday before switching to west to northwest. Northwest winds will increase on Saturday as a cool upper trough passes to the north of the area. Large long-period northwest swell will impact the waters Thursday night through Saturday. Hazardous conditions for small craft vessels will exist with this arriving northwest swell due to steep large seas.


7 Day Forecast for Marine Location Near Milpitas, CA
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location: 37.44, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 121152 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 352 AM PST Thu Dec 12 2019

SYNOPSIS. Light rain will linger over the region through the morning before diminishing in coverage later in the day. Rain chances increase again Friday into Saturday with temperatures turning colder Sunday into Monday. An unsettled and wet pattern will likely return by middle of next week.

DISCUSSION. as of 03:14 AM PST Thursday . Zonal flow aloft continues to advect moisture across the region with light rain still being reported from the Santa Cruz Mountains northward across the San Francisco Bay Area. Meanwhile, mainly dry conditions prevail over the Central Coast with widespread cloud cover region-wide. These conditions have allowed for temperatures to hold in the 50s to even lower 60s with not much additional cooling before sunrise. Similar to the past few days, precipitation amounts will remain light and only amount to a few hundredths of an inch or so per hour. The forecast calls for conditions to dry out by this afternoon and into late this evening as slightly drier air briefly settles into the region.

By late Friday into Saturday, moisture advection will again increase over the northern and central California coast ahead of a mid/upper level system that will drop southward over the region. This will bring renewed chances for light to moderate rain first developing over the North Bay early Friday before spreading southward through Friday night. Similar to the last passing system, the best chances for rainfall will be over San Francisco Bay Area with lesser chances for the Central Coast. This will be a result of a likely dissipate frontal system as mid/upper level support will be limited. Rain chances may linger into Saturday as well with the NAM and GFS both showing a secondary system moving across the region while the ECMWF keeps conditions mostly dry on Saturday. Regardless, the ensembles generally agree with unsettled conditions likely persisting into Saturday before drying out late Saturday night into Sunday.

Conditions will dry out and temperatures will turn cooler Sunday into early next week as a colder air mass to the north advects southward. Looking for more widespread 30s and 40s for overnight lows from Saturday night into Monday night. Will need to watch for the potential for areas of frost or even freezing temperatures in the region's coldest interior valleys early next week.

While the operational models continue to differ in the details heading into the middle/late part of next week, the ensembles do indicate a return to unsettled and wet conditions. Initial thinking is there will be a potential for more widespread rainfall across the region during the extended forecast period.

AVIATION. as of 3:50 AM PST Thursday . Unsettled pattern with weak forcing/winds but abundant low level moisture thru the taf period. Main impact will be from LIFR to MVFR cigs (depending on location and time of day). Winds will generally be light (10kt or less). Isolated, very light on and off rain showers throughout the taf period as well but generally too weak to bring extended periods of wet runways. Ceilings generally MVFR-VFR from midday to sunset with MVFR to IFR, locally LIFR-VLIFR overnight.

Vicinity of KSFO . MVFR cigs with bases around 1500-2500 ft today. Light winds under 10 kt. Light passing showers throughout the duration. IFR ceilings (1000 feet or less) possible tonight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Other than 8-11kt SE winds at Salinas through the morning, light winds are expected. Ceilings generally borderline MVFR/IFR this morning, improving through the day, but then lowering to borderline LIFR/IFR tonight. A few passing light showers through the duration.

MARINE. as of 03:46 AM PST Thursday . Light southerly winds will prevail through Thursday before switching to west to northwest. Northwest winds will increase on Saturday as a cool upper trough passes to the north of the area. Large long-period northwest swell will impact the waters Thursday night through Saturday. Hazardous conditions for small craft vessels will exist with this arriving northwest swell due to steep large seas.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. High Surf Advisory . CAZ006-505-509-529-530 SCA . Pt Arena to Pt Reyes 0-10 nm from 10 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm from 10 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 10 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 10 AM SCA . Pt Arena to Pigeon Pt 10-60 nm from 10 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 10 AM



PUBLIC FORECAST: RGass AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 17 mi57 min SSE 1 G 1.9 61°F 57°F1024 hPa
AAMC1 - 9414750 - Alameda, CA 31 mi57 min 55°F
LNDC1 31 mi57 min SW 2.9 G 4.1 59°F 1023.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 33 mi63 min S 1.9 G 2.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi57 min SSW 2.9 G 4.1 58°F 1023.8 hPa
OBXC1 34 mi57 min 59°F 59°F
PXSC1 36 mi57 min 60°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 36 mi57 min SW 1 G 1.9 59°F 1022.7 hPa
FTPC1 - 9414290 - San Francisco, CA 39 mi63 min SW 2.9 G 7 58°F 55°F1023.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi57 min SW 8 G 9.9 59°F 1024 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi63 min SE 5.1 G 6 53°F 1023.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 42 mi52 min S 8.9 57°F 1024 hPa (+1.0)
RCMC1 - 9414863 - Richmond, CA 43 mi57 min 55°F
UPBC1 43 mi57 min NE 5.1 G 5.1
PCOC1 - 9415144 - Port Chicago, CA 43 mi57 min E 2.9 G 5.1 53°F 53°F1023.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi63 min NNE 2.9 G 5.1 53°F 54°F1023.7 hPa
ELXC1 - Elkhorn Slough Reserve, CA 44 mi60 min Calm 57°F 1025 hPa55°F
46237 - San Francisco Bar, CA (142) 45 mi75 min 55°F7 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi84 min Calm G 0 57°F 1024.9 hPa54°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 47 mi57 min SW 7 G 8.9 58°F 1023.2 hPa
46092 - MBM1 48 mi98 min SE 5.8 57°F 57°F1024.7 hPa (+1.3)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA5 mi52 minSSE 1010.00 miOvercast60°F54°F80%1023.7 hPa
Hayward, Hayward Air Terminal, CA19 mi51 minSSW 48.00 miLight Rain60°F55°F84%1024.7 hPa
Livermore, Livermore Municipal Airport, CA19 mi52 minNW 410.00 miOvercast60°F55°F84%1023.1 hPa
San Carlos Airport, CA19 mi50 minN 010.00 miOvercast59°F59°F100%1024 hPa
Oakland, Metro Oakland International Airport, CA24 mi52 minSSW 59.00 miOvercast61°F57°F87%1023.9 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrS8S6S4S8S8S9S8S8SE10SE9SE12S8SE9SE11SE9S8S6S6S5S4SE3SE10SE8SE10
1 day agoCalmS3NW3E3S5SE3NW3NW6W3NW3N6N3W5N9N93SE6SW4SE8SE7S7SE7S6S9
2 days agoW4SW4SW4CalmN3N4NW6N4NW6N7N6NW7NW5NW5NW6NW6N3NW4CalmSE3CalmCalmCalmSW3

Tide / Current Tables for Coyote Creek, Tributary #1, San Francisco Bay, California
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Coyote Creek
Click for Map
Thu -- 01:35 AM PST     7.27 feet High Tide
Thu -- 07:12 AM PST     Sunrise
Thu -- 07:23 AM PST     2.51 feet Low Tide
Thu -- 07:37 AM PST     Moonset
Thu -- 12:07 PM PST     9.00 feet High Tide
Thu -- 04:50 PM PST     Sunset
Thu -- 05:33 PM PST     Moonrise
Thu -- 08:22 PM PST     -1.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.87.17.26.65.54.23.12.62.84.16.1898.87.96.44.52.50.7-0.6-1.2-10.42.4

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Thu -- 01:26 AM PST     -0.01 knots Slack
Thu -- 05:01 AM PST     -0.68 knots Max Ebb
Thu -- 06:51 AM PST     0.00 knots Slack
Thu -- 07:13 AM PST     Sunrise
Thu -- 07:37 AM PST     Moonset
Thu -- 09:31 AM PST     1.03 knots Max Flood
Thu -- 12:15 PM PST     -0.01 knots Slack
Thu -- 04:50 PM PST     Sunset
Thu -- 05:11 PM PST     -1.52 knots Max Ebb
Thu -- 05:33 PM PST     Moonrise
Thu -- 07:54 PM PST     0.00 knots Slack
Thu -- 10:39 PM PST     1.50 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.3-0.2-0.4-0.6-0.7-0.40.10.6110.70.2-0.3-0.7-1.1-1.4-1.5-1.3-0.70.10.91.41.5

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 (8,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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