Monday, November30, 2020
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Marine Weather and Tides
Lagunitas-Forest Knolls, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:05AMSunset 4:52PM Monday November 30, 2020 9:34 AM PST (17:34 UTC) Moonrise 5:17PMMoonset 7:23AM 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- 843 Am Pst Mon Nov 30 2020
Today..NW winds 10 to 20 kt. Wind waves around 2 ft. W swell 7 to 9 ft at 17 seconds.
Tonight..N winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 17 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 15 seconds.
Tue night..NE winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 14 seconds.
Wed..E winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 13 seconds.
Wed night..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell 3 to 5 ft at 12 seconds and W 4 to 6 ft at 22 seconds.
Thu..N winds 5 to 10 kt. Wind waves 1 ft. SWell W 9 to 11 ft.
Fri..NE winds 5 to 10 kt. Wind waves 1 ft. SWell W 7 to 9 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 5 ft with a dominant period of 13 seconds. Across the bar...seas 6 to 7 ft with dominant swell period of 13 seconds. Maximum ebb current of 3.6 kt at 03:49 pm Monday and 0.9 kt at 05:07 am Tuesday.
PZZ500 843 Am Pst Mon Nov 30 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Locally moderate to gusty nnw winds south of pigeon point through the day today. Nnw winds strengthen across the waters late today through early Tuesday. Winds subside late Tuesday into Wednesday, then shift offshore through the day Wednesday. A pair of long period northwest swell trains will arrive through the week. The second of which will feature extremely long period northwest swells that will bring potentially hazardous conditions alongshore Wednesday into Thursday.


7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls, 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 301306 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 415 AM PST Mon Nov 30 2020

SYNOPSIS. Slightly cooler day Monday followed by a return of ridging will result in sunny, mild days and clear, cool nights through next weekend. There is the potential for some light to moderate offshore winds in the hills and mountains as well, but greatest threat will be focused on Southern California. Conditions look to remain dry through the forecast.

DISCUSSION. As of 3:35 AM PST Monday . Water vapor imagery this morning has picked up on a slither of moisture ahead of drier, NW flow making its way across far northern California. The bulk of the moisture plume remains well to our north on the divergent quadrant of the shortwave trough off the coast of the PAC NW. Some of this moisture has made itself apparent over our CWA in the form of a few high-based clouds and patchy spots of fog over coastal Marin and San Mateo counties. That being said, have also observed a gradual clearing in some of the east and southeastern portions of our CWA, which has made for easier viewing of the partial lunar eclipse. This is in response to the upper-level NW flow just behind the tail-end of the moisture plume which will slowly advect over our CWA in the form of a subtle FROPA. Passage will occur sometime later this morning and will see an increase in onshore flow from the Bay Area all the way down to Northern Monterey County as a result. Also looking like slightly cooler max temps today given the NW flow regionwide.

Do still expect some offshore flow over portions of Napa County tonight but Local WRF and NAM have substantially backed off on the intensity of the offshore flow, with max gusts in the North Bay Mountains in the 15-20mph range and peak gusts in the windiest locations (eg. Mt. St. Helena) making it up to 30mph. Onshore flow will be the dominant flow across the lower-elevations of the North Bay and much of the CWA tonight. This will result in improvements to our overnight humidity recoveries through Tuesday morning. Unfortunately,looking like the upper-level ridge will quickly build itself up over the next couple of days so these slight improvements will be short-lived at best. Dry, offshore winds are also still expected across portions of the Santa Lucia Mountains tonight and into Tuesday morning, but thankfully only expecting light to moderate winds at most.

As the upper-level ridge builds back, mid-range guidance progs the current shortwave trough over the PAC NW to quickly deepen as it travels east and makes it to the lee of the Canadian Rockies. The The eastern 2/3 of the CONUS will be dominated by a double-barrel trough setup as a result, while the upper-level ridge will respond by quickly building across the western coast of North America. Expecting 575dm heights to make it as far north as the Washington/BC border in response to the troughs. This amplified pattern will translate to mild daytime temps and cool nights in our region, along with dry conditions, from Tuesday through the end of the workweek. Will see periods of light to moderate offshore flow in the higher-terrain locations of the CWA through the remainder of the workweek as well, but mid-range guidance not suggesting that any of these overnight winds will generate any substantial fire weather concerns.

Primary concern is over how much longer this dry spell will continue, as moisture recovery from the rains earlier this month will become increasingly offset by the continuation of persistent ridging. Longer-range GEFS and ECMWF ENS members all in agreement that amplified pattern of the CONUS will lead to the upper-level ridge taking on a more slanted shape (45 degree) axis over the West Coast. As it does so, PAC moisture will get steered well to the north of the US/Canada border through next weekend. The amplified upper-level trough in the lee of the Rockies also looking more and more likely to become tilted towards the Desert Southwest in response to the slanted ridge. Sharp gradient looks set to develop between Arizona and Southern California (eg. Santa Anas) by Thursday and Friday but latest members are also starting to suggest the gradient may become prominent as far north as portions of the Central Coast. For now, lots of uncertainty regarding the intensity of the gradient over our CWA next weekend, but may at the very least observe a continuation of light to moderate offshore flow through the first-half of the first full week of December.

If there is any good news, it's that some of the ECMWF ENS weeklies are hinting that all of this moisture-blockage by the upper-level ridge may have an end in sight: upper-level waves from the PAC have been slowly attempting to chip away at the stable air mass over the West Coast. Some of these long-range ensembles hint at the possibility that zonal upper-level flow may finally break through the ridge and begin to pour into California sometime by mid-December. If this were to verify, would give storm systems a fighting chance to introduce moisture into our CWA. Nonetheless, this is still over 240 hours out, so a lot can change between now and then. For now, upper-level ridge not showing any immediate signs of weakening anytime soon.

AVIATION. as of 4:15 AM PST Monday . For the 12Z TAFs. Satellite and surface observations show patchy fog and low clouds /VLIFR-IFR/ along the immediate coast with some inland intrusion over Marin and southern Sonoma Counties. Otherwise it's VFR. Patchy fog and low clouds forming along the coast tonight with local inland intrusion offset by developing mainly light offshore winds overnight.

Vicinity of KSFO . VFR, west wind near 5 knots becoming west to northwest 10 to 15 knots by mid afternoon. Coastal low clouds /MVFR/ possibly reaching KSFO in the mid afternoon to early evening hours. Light west wind tonight becoming light and variable then light northeast by early Tuesday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR, mainly light east to southeast winds except locally up to 10 knots in the Salinas Valley through the morning. West to northwest winds briefly 5 to 10 knots in the late afternoon, winds then east to southeast near 5 knots tonight.

BEACHES. A long period northwest swell will arrive late this morning, impacting the coastline, particularly west and northwest facing beaches, through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves and rip currents today. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds today night and early Tuesday morning before subsiding late Tuesday morning. Beachgoers are advised to exercise caution on impacted beaches. An even longer period northwest swell will arrive Wednesday resulting in an even greater risk of these hazards.

MARINE. as of 3:40 AM PST Monday . High pressure strengthens over the eastern Pacific today and tonight with high pressure spilling into the Intermountain West and becoming stationary Tuesday through Friday. Northwest winds becoming more northerly mid to late week. Long period northwest swell arrives this afternoon into Tuesday with longer period swell train arriving Wednesday into Thursday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 9 AM SCA . Pt Arena to Pt Reyes 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 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 6 AM



PUBLIC FORECAST: Diaz AVIATION/MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi64 min 53°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi34 min NNW 12 G 14 52°F1027 hPa (+1.4)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi41 min Calm 49°F 1027 hPa (+2.0)
RCMC1 - 9414863 - Richmond, CA 18 mi52 min N 1 G 2.9 48°F 55°F1026.6 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi46 min NE 4.1 G 5.1 49°F 55°F1026.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi46 min N 6 G 8 48°F 1026.9 hPa
PXSC1 22 mi46 min 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi46 min N 6 G 7 49°F 1025.7 hPa
OBXC1 24 mi46 min 48°F 46°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi46 min NNW 5.1 G 6 47°F 1026.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi46 min NNW 5.1 G 6
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi46 min SW 5.1 G 5.1 48°F 1026.5 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi46 min ESE 1.9 G 2.9 49°F 55°F1026.8 hPa
LNDC1 27 mi46 min ESE 2.9 G 4.1 48°F 1026.6 hPa
UPBC1 33 mi46 min NW 2.9 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi46 min WNW 1 G 1.9 47°F 54°F1026.9 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi24 min NW 12 G 14 50°F 1026.4 hPa48°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi46 min SSW 5.1 G 6 44°F 53°F1026.8 hPa
46214 - Point Reyes, CA (029) 38 mi38 min 53°F8 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi109 min NNE 1
RTYC1 - 9414523 - Redwood City, CA 43 mi46 min N 2.9 G 2.9 47°F 56°F1027.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi34 min NNW 14 G 16 51°F 1026.9 hPa (+1.3)48°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi46 min N 1.9 G 4.1 46°F 1026.8 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi59 minN 05.00 miFog/Mist39°F39°F100%1026.7 hPa
Petaluma Municipal Airport, CA20 mi39 minN 010.00 miFair43°F37°F81%1027.1 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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1 day agoSE3S3SE3SE5SE4SE4--S4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN5
2 days agoCalmSE65SE6SE6SE5CalmCalmS4CalmCalmCalmCalmCalmCalmS4CalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Mon -- 01:32 AM PST     Full Moon
Mon -- 05:14 AM PST     1.69 feet Low Tide
Mon -- 07:07 AM PST     Sunrise
Mon -- 07:22 AM PST     Moonset
Mon -- 10:29 AM PST     4.21 feet High Tide
Mon -- 04:51 PM PST     Sunset
Mon -- 05:16 PM PST     Moonrise
Mon -- 06:09 PM PST     -0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.232.72.21.91.71.82.333.74.14.23.83.22.31.30.5-0.1-0.3-0.10.41.11.92.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Mon -- 12:29 AM PST     -0.00 knots Slack
Mon -- 01:32 AM PST     Full Moon
Mon -- 02:37 AM PST     -0.62 knots Max Ebb
Mon -- 05:50 AM PST     0.00 knots Slack
Mon -- 07:08 AM PST     Sunrise
Mon -- 07:24 AM PST     Moonset
Mon -- 08:38 AM PST     0.69 knots Max Flood
Mon -- 11:22 AM PST     -0.00 knots Slack
Mon -- 02:45 PM PST     -1.35 knots Max Ebb
Mon -- 04:52 PM PST     Sunset
Mon -- 05:17 PM PST     Moonrise
Mon -- 06:45 PM PST     0.00 knots Slack
Mon -- 09:45 PM PST     1.00 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.2-0.6-0.6-0.5-0.200.40.60.70.50.2-0.3-0.8-1.3-1.3-1.1-0.8-0.40.10.60.910.9

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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Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Sacramento, CA
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