Thursday, December12, 2019
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Marine Weather and Tides
Lagunitas-Forest Knolls, 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 7:15AMSunset 4:52PM Thursday December 12, 2019 2:28 AM PST (10:28 UTC) Moonrise 5:35PMMoonset 7:42AM Illumination 100% Phase: Full Moon; Moon at 15 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- 824 Pm Pst Wed Dec 11 2019
Tonight..S winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 17 seconds. A chance of rain.
Thu..S winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft at 18 seconds. A chance of rain.
Thu night..W winds 5 to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft at 17 seconds. A chance of rain.
Fri..SW winds around 5 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds. A chance of rain.
Fri night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 10 to 12 ft at 17 seconds. A chance of rain.
Sat..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 9 to 11 ft at 16 seconds.
Sat night..NW winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 7 to 9 ft.
Mon..E winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with a dominant period of 16 to 18 seconds increasing to 8 to 10 ft Thursday. Across the bar...seas 6 to 8 ft with a dominant period of 16 to 18 seconds increasing to 9 to 11 ft Thursday. Maximum ebb current of 1.1 kt at 04:13 am Thursday and 4.1 kt at 03:43 pm Thursday.
PZZ500 824 Pm Pst Wed Dec 11 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.


7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls CDP, CA
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location: 37.98, -122.74     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 120603 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1003 PM PST Wed Dec 11 2019

SYNOPSIS. Lingering light rain continues over the North Bay tonight, after scattered showers passed over the Bay Area earlier this evening. Light rain tapers off Thursday afternoon, but chances for rain returns on Friday and Saturday. Mild temperatures undergo a slow cooling trend toward the weekend. Sunday and Monday morning temperatures will be in the low to mid 40s. By the middle of next week, the forecast shifts back to an unsettled and rainy pattern.

DISCUSSION. as of 08:50 PM PST Wednesday . With consistent moisture from the Pacific continuing to move over the region, a weak short wave that moved over the Bay Area provided enough forcing to bring light to moderate rain to the Bay Area, particularly in the North Bay. Stratus clouds will sit comfortably over the region through the night. The zonal flow will continue tomorrow, so we can't completely rule out the chance of isolated light rain on Thursday. However, better chances are in the early morning due to lingering moisture and then will taper off in the afternoon as a pocket of dry air briefly moves over the region. Temperatures will remain in the 60s and trend cooler into the 50s toward the weekend under cloudy skies.

Regarding Friday into Saturday, we expect rain again for much of the Bay Area. But being only two days out, there is still inconsistency between models on timing. The Euro has it moving in on Friday in the late morning, the NAM has it Friday afternoon, and the GFS has it late on Friday evening. What we do know is that the synoptic guiding pattern bringing subtropical moisture to our region will continue and steady rain through Saturday morning is expected.

Saturday night into Sunday sees the next upper level trough pass over. This will bring in more cold air advection from the northwest allowing low temperatures to drop on Sunday morning. Widespread low- to-mid 40s is forecast with isolated low lying valleys of the North Bay, East Bay and Southern Monterey County is expected to drop into the 30s. Similar chilly temperatures are forecast for Monday morning as well.

In the long range: an upper level ridge builds in the early part of next week helping to drive a slight warm up. As we get closer to the date, models will resolve the magnitude of the brief change in temps. The main story though is what's behind the ridge. Models are beginning to hint at the sign of the next system, that could bring widespread rain for the Bay Area and along the Central Coast for the middle to end of next week.

AVIATION. as of 10:04 PM PST Wednesday . A series of shortwave disturbances will keep abundant low level moisture over the area through Thursday. MVFR cigs will persist with occasional IFR cigs in the valleys and the MRY Bay Area. Occasional light rain and drizzle can be expected mainly from the SFO Bay Area north which is where most of the moisture is. Winds will be light and generally out of the east or southeast.

Vicinity of KSFO . MVFR cigs with bases around 1500-2500 ft. Light southeast winds under 10 kt. Occasional light rain or drizzle.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Areas of MVFR cigs around the area becoming more widespread after 08Z. Cigs lowering into IFR category at times. Light east to southeasterly winds under 10 kt.

MARINE. as of 09:44 PM PST Wednesday . 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.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. High Surf Advisory . CAZ006-505-509-529-530



PUBLIC FORECAST: DK AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi59 min 54°F1021.9 hPa
46237 - San Francisco Bar, CA (142) 15 mi59 min 55°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi39 min SW 5.8 G 7.8 57°F 56°F6 ft1023 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi54 min ESE 5.1 57°F 1023 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi59 min S 7 G 11 57°F 55°F1021.8 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi59 min SSW 8 G 13 60°F 55°F1022.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi59 min SSE 8.9 G 12 59°F 1022.5 hPa
PXSC1 22 mi59 min 57°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi59 min E 8 G 8 57°F 1021.2 hPa
OBXC1 24 mi59 min 58°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi59 min SE 6 G 6
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi59 min SSE 5.1 G 6 58°F 1022.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi59 min E 8 G 9.9 55°F 1021.5 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi59 min ESE 4.1 G 5.1 59°F 55°F1022.5 hPa
LNDC1 27 mi59 min SSE 2.9 G 4.1 59°F 1022.4 hPa
UPBC1 33 mi59 min E 5.1 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi59 min ENE 2.9 G 5.1 53°F 54°F1022.3 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi39 min WSW 5.8 G 7.8 56°F 56°F8 ft1022.4 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi59 min ENE 4.1 G 5.1 53°F 53°F1022 hPa
46214 - Point Reyes, CA (029) 38 mi59 min 57°F8 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi104 min S 1 53°F 1023 hPa
RTYC1 - 9414523 - Redwood City, CA 43 mi59 min SE 4.1 G 7 61°F 57°F1022.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi39 min SW 5.8 G 5.8 58°F 57°F7 ft1023.3 hPa57°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi59 min SSE 2.9 G 4.1 53°F 1022.3 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi34 minN 00.75 miFog/Mist55°F55°F100%1022.7 hPa
Petaluma Municipal Airport, CA20 mi34 minN 01.50 miFog/Mist55°F55°F100%1022.7 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrSE5CalmCalmCalmE4SE5SE5SE4SE4SE4SE5SE4SE5SE5SE7SE4CalmCalmS3CalmSE3SE3E4Calm
1 day agoNW5NW3CalmCalmCalmCalmCalmCalmCalmE7E6SE5E45CalmCalmCalm5CalmCalm--SE5SE3E4
2 days agoCalmCalmCalmCalmSW3S5CalmCalmCalmCalmCalmCalmCalmN4NW4NW5NW6NW5CalmCalmCalmCalmCalmNW5

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Thu -- 12:03 AM PST     3.27 feet High Tide
Thu -- 05:15 AM PST     1.71 feet Low Tide
Thu -- 07:17 AM PST     Sunrise
Thu -- 07:41 AM PST     Moonset
Thu -- 10:35 AM PST     4.48 feet High Tide
Thu -- 04:51 PM PST     Sunset
Thu -- 05:34 PM PST     Moonrise
Thu -- 06:14 PM PST     -0.59 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.33.12.82.31.91.71.82.43.13.94.44.54.13.42.51.40.4-0.3-0.6-0.40.10.91.82.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Thu -- 12:36 AM PST     -0.00 knots Slack
Thu -- 02:44 AM PST     -0.68 knots Max Ebb
Thu -- 05:46 AM PST     0.00 knots Slack
Thu -- 07:18 AM PST     Sunrise
Thu -- 07:43 AM PST     Moonset
Thu -- 08:43 AM PST     0.77 knots Max Flood
Thu -- 11:25 AM PST     -0.00 knots Slack
Thu -- 02:54 PM PST     -1.52 knots Max Ebb
Thu -- 04:52 PM PST     Sunset
Thu -- 05:35 PM PST     Moonrise
Thu -- 06:49 PM PST     0.00 knots Slack
Thu -- 09:51 PM PST     1.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.3-0.2-0.6-0.7-0.5-0.20.10.40.70.80.60.2-0.3-0.9-1.4-1.5-1.3-0.9-0.40.10.611.11

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 Sacramento, CA
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