Friday, April3, 2020
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Marine Weather and Tides
Tamalpais-Homestead Valley, CA

Version 3.4
NOTICE
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 6:49AMSunset 7:36PM Friday April 3, 2020 10:32 AM PDT (17:32 UTC) Moonrise 1:34PMMoonset 3:21AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 848 Am Pdt Fri Apr 3 2020
.small craft advisory in effect from noon pdt today through this evening...
Today..W winds 5 to 15 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Sat..SW winds 5 to 15 kt, becoming to W 10 to 20 kt with gusts up to 25 kt this afternoon. Rain.
Sat night..SW winds 5 to 15 kt. Rain likely.
Sun..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Sun night..SW winds up to 10 kt. Rain likely.
Mon..W winds up to 10 kt. Rain likely.
Tue..W winds up to 10 kt. A chance of rain.
PZZ500 848 Am Pdt Fri Apr 3 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong northwest winds will generate fresh and steep wind waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the gulf of alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.


7 Day Forecast for Marine Location Near Tamalpais-Homestead Valley, CA
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location: 37.89, -122.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 031619 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 919 AM PDT Fri Apr 3 2020

SYNOPSIS. Sunny and mild weather today with clouds increasing by tonight ahead of the Saturday cold front. Light rain develops in the North Bay Saturday morning spreading across the Bay Area Saturday afternoon and evening. A second system drops down the coast Sunday keeping a steady rain going for much of the day across the region. Precipitation becomes more showery Sunday night into Monday as the upper low drops down the coast. The parent low will cut-off over Southern California keeping temperatures below normal and the chance of showers in the forecast through midweek.

DISCUSSION. as of 9:15 AM PDT Friday . Another chilly start to the day with widespread temperatures in the 30s to low 40s inland and mid to upper 40s along the shorelines. Today will be similar to yesterday albeit slightly cooler and with increasing high clouds. Latest water vapor imagery indicates increasing moisture advecting into the region under northwesterly flow aloft. As a result, visible imagery shows some thin high clouds at around 20000-25000 feet over the area this morning that have manifested in this moister air mass.

This elevated moisture is associated with the arrival of the first of two storm systems expected to bring unsettled weather to the Bay Area and Central Coast through the upcoming weekend before lingering into much of next week. The first storm system will arrive in the North Bay Saturday evening and slowly dissipate as it shifts southward towards the South Bay, fizzling over the Central Coast late tomorrow. Local WRF data suggests showers may be on the weaker end of previous forecast ranges for southern areas (South Bay, Central Coast) as the system weakens late tomorrow.

That said, local WRF data indicates potential for frontogenesis where the first system stalled out as the second system shifts into the region early Sunday morning -- reinvigorating rain rates for the Santa Cruz mountains, and increasing gusty southerly winds for the Santa Cruz mountains, Monterey Bay/Peninsula, and down the Big Sur coast through Sunday morning.

A second well developed cold frontal boundary associated with the second storm system will then sweep across the region on Sunday and Sunday night. Strong gusty south to southeast winds (gusts 30-45mph in windier spots) and the heaviest sustained rain rates/accumulations of the weekends will be associated with this second surface cold frontal boundary on Sunday.

The upper low is then projected to slow down and wobble as it slides down the California coast throughout much of next week, extending the potential for wet, unsettled weather through Thursday, possibly into Friday. That said, Monday will see the highest likelihood of heavier rain showers and potentially Thunderstorms as the coldest air mass shifts along the coast near the core of the upper low. Latest model runs also show -10C at 700mb over the region Monday and into Tuesday, which generally translates to snow levels around 3500 ft, meaning some of the taller peaks across the area could see a dusting of snow with the post frontal showers early next week.

For those interested in the Sierra/Tahoe snowpack, heavy snow accumulations are expected with these storm systems, be sure to follow NWS Sacramento and Reno for more information. See previous discussion below for more details on the current forecast.

DISCUSSION. as of 3:20 AM PDT Friday . Skies are mostly clear with just some patchy clouds so far in favored locations such as Half Moon Bay and Monterey. Today will be one last quiet weather days with sunshine and highs generally in the 60s. By tonight clouds will be on the increase as the first shortwave drops down from the Gulf of Alaska. Model timing remains consistent and expect rain to develop in the North Bay by around 12z Saturday morning. Light rain slowly spreads southward across the Bay area through lunchtime and the afternoon hours of Saturday with the front losing much of its punch by the time it reaches the Central Coast. Rain amounts by Saturday evening should be up to a half inch in the North Bay with 0.10-0.25 Bay Area southward and little or no rainfall south of Salinas.

There are some subtle but noteworthy changes for the Sunday system. The 00z and 06z NAM keep the core of the upper low and associated cold air farther offshore. The end result will still be a rainy Sunday across the Bay Area as the slow moving boundary impacts the region. The convective parameters dont look nearly as impressive compared to 24 hours ago and snow levels will be much higher through Sunday afternoon with 850 mb temps above zero. Other factor to watch will be the position of the low may induce more unfavorable southeast wind flow versus southwest upslope flow. So some of the exciting meteorological factors are fading on Sunday (t-storms, lowering snow levels, etc) but still expecting a soaking rainfall.

On Sunday night into Monday the coldest air aloft may pass over the region with precip becoming more showery. Forecast will now show t-storm chances on Monday afternoon. Rainfall totals by Monday evening of 0.50-1.00 lower elevations with 1-2 inches for the hills.

ECMWF keeps the low wobbling around Pt Conception right through Weds so lingering showers, especially from the Santa Cruz mtns southward remain in the forecast for Tuesday/Weds with temps running below seasonal norms. The low may finally eject by Thursday/Friday of next week.

AVIATION. as of 5:00 AM PDT Friday . For 12Z TAFs. It's VFR except for patchy MVFR ceilings vicinity KHAF and KSNS. Cirrus clouds are arriving from the northwest. A warm front approx 600 miles to our west arrives Saturday morning with light rain. Lower level winds are gusty over the coastal waters with some overlap of gusty winds reaching the immediate coastline today. Surface winds forecasts for tonight and Saturday morning are a tough call since night-time stability may be enough to decouple surface winds from gusty winds aloft, difficult to say due to varying temperature advection and lower level evaporative cooling until the warm front arrives Saturday.

Vicinity of KSFO . VFR, west wind near 15 knots this morning becoming gusty to 25 to 30 kt by late morning or early afternoon. Increasing clouds tonight, cloud ceilings lowering to MVFR by 14z Saturday with light rain developing.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Lower level cooling over the southern Monterey Bay is causing low level clouds to form, occasionally resulting in MVFR ceilings. Generally VFR mid to late morning, VFR in the afternoon. West winds gusting to 20 knots.

MARINE. as of 4:37 AM PDT Friday . Strong northwest winds will generate fresh and steep wind generated waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the Gulf of Alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: DRP AVIATION: Canepa MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 7 mi34 min N 5.1 52°F 1019 hPa
46237 - San Francisco Bar, CA (142) 8 mi62 min 53°F6 ft
FTPC1 - 9414290 - San Francisco, CA 8 mi44 min 58°F
RCMC1 - 9414863 - Richmond, CA 9 mi44 min NNW 2.9 G 5.1 51°F 56°F1019.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 11 mi44 min ESE 1.9 G 2.9 53°F 1019.7 hPa
PXSC1 11 mi44 min 52°F 35°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 11 mi44 min N 2.9 G 5.1 50°F 1018.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi44 min N 4.1 G 5.1 51°F 1019.5 hPa
OBXC1 14 mi44 min 51°F 34°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi44 min N 2.9 G 4.1
AAMC1 - 9414750 - Alameda, CA 16 mi44 min W 2.9 G 4.1 51°F 59°F1019.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 17 mi32 min NW 23 G 29 50°F 52°F1020.1 hPa (+1.2)
LNDC1 17 mi44 min SW 1.9 G 4.1 52°F 1019.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 20 mi44 min WNW 6 G 8 51°F 1019.3 hPa
UPBC1 26 mi44 min WNW 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi44 min W 7 G 9.9 51°F 58°F1019.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi44 min W 11 G 13 51°F 58°F1018.9 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi44 min WNW 5.1 G 8 52°F 60°F1019.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 36 mi107 min W 5.1
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi44 min WNW 7 G 9.9
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi32 min NNW 23 G 29 52°F 55°F1020.5 hPa44°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi32 min NNW 23 G 27 51°F1020.4 hPa (+1.4)
46214 - Point Reyes, CA (029) 47 mi32 min 53°F11 ft

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA18 mi57 minNNW 910.00 miFair52°F35°F54%1019.6 hPa
San Francisco, San Francisco International Airport, CA22 mi36 minVar 310.00 miMostly Cloudy55°F34°F45%1019.3 hPa
Oakland, Metro Oakland International Airport, CA23 mi39 minSW 310.00 miMostly Cloudy55°F39°F57%1019.6 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrN9N7NW9NW11NW11----W13
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Calm--CalmSE5E4CalmCalmCalmN34N12
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Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California
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Sausalito
Click for Map
Fri -- 02:27 AM PDT     2.88 feet Low Tide
Fri -- 04:20 AM PDT     Moonset
Fri -- 06:51 AM PDT     Sunrise
Fri -- 08:00 AM PDT     5.20 feet High Tide
Fri -- 02:33 PM PDT     Moonrise
Fri -- 03:04 PM PDT     -0.26 feet Low Tide
Fri -- 07:35 PM PDT     Sunset
Fri -- 10:14 PM PDT     4.70 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.63.22.92.93.33.84.555.254.33.220.80-0.3-00.61.52.53.54.34.74.6

Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current
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Richardson Bay Entrance
Click for Map
Fri -- 12:44 AM PDT     0.00 knots Slack
Fri -- 02:47 AM PDT     0.61 knots Max Flood
Fri -- 04:20 AM PDT     Moonset
Fri -- 05:53 AM PDT     -0.00 knots Slack
Fri -- 06:51 AM PDT     Sunrise
Fri -- 10:13 AM PDT     -0.83 knots Max Ebb
Fri -- 01:22 PM PDT     0.00 knots Slack
Fri -- 02:33 PM PDT     Moonrise
Fri -- 03:53 PM PDT     1.07 knots Max Flood
Fri -- 07:32 PM PDT     -0.00 knots Slack
Fri -- 07:35 PM PDT     Sunset
Fri -- 10:59 PM PDT     -0.51 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.10.50.60.50.3-0-0.3-0.5-0.7-0.8-0.8-0.5-0.20.40.91.110.70.3-0.1-0.3-0.5-0.5

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.