Wednesday, September23, 2020
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Marine Weather and Tides
Tiburon, 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 6:57AMSunset 7:05PM Wednesday September 23, 2020 12:14 PM PDT (19:14 UTC) Moonrise 1:14PMMoonset 10:51PM Illumination 40% Phase: Waxing Crescent; Moon at 6 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- 906 Am Pdt Wed Sep 23 2020
Today..SW winds 5 to 15 kt. Gusts up to 25 kt this afternoon.
Tonight..W winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..W winds 5 to 15 kt.
Fri..SW winds 5 to 10 kt.
Fri night..W winds 5 to 15 kt.
Sat..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..NW winds 5 to 15 kt.
PZZ500 906 Am Pdt Wed Sep 23 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 980 mb low in the gulf of alaska will generate large long-period northwest swells that will arrive Thursday night and Friday. SWell heights generally around 10 to 12 feet and periods of 15 to 18 seconds are expected. High pressure off the central california coast will bring gusty winds to the southern waters through Friday while lighter winds prevail over the northern waters.


7 Day Forecast for Marine Location Near Tiburon, CA
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location: 37.92, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 231751 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1051 AM PDT Wed Sep 23 2020

SYNOPSIS. Sunny and warm today. A weak front moves into Northern California Thursday but the main impacts over the Bay Area will just be some increased clouds, slightly stronger westerly winds and a few degrees of cooling.. Minor warming on Friday gives way hot and dry conditions over the weekend. Offshore winds are forecast to set up over the North Bay Mountains and East Bay Hills, prompting a Fire Weather Watch for Saturday morning through Monday morning. Hottest temperatures Sunday and Monday. Warm and dry conditions forecast to continue at least through the middle of next week.

DISCUSSION. as of 10:01 AM PDT Wednesday . No significant short term updates needed this morning. Skies are sunny with a shallow marine inversion layer around 1000 feet. But some cooling aloft is keeping the inversion weak for now. A weak cold front moves into far Northern California on Thursday but little overall impact for the Bay Area. Temps may drop a few degrees with some increased clouds, especially for the North Bay on Thursday. Should the marine layer try and reform some coastal drizzle will be possible Thursday morning as well. Slight increase in west winds Thursday afternoon to keep refreshing onshore breezes in place.

Behind the cold front high pressure starts to build Friday afternoon with a modest warming trend and compressed marine layer.

Forecast for the weekend is on track. Initial shot of north winds as early as Saturday morning will occur with humidity values still high and temps cool. By midday Saturday temperatures will begin to rapidly warm as offshore wind pattern begins to set up. Afternoon highs on Saturday rapidly warming into the 90s with latest MOS guidance from the ECMWF showing 100 degrees for Santa Rosa as northerly downslope winds develop.

Fire Weather Watch looks on target with strongest shot of winds overnight Saturday night into Sunday morning. Northeast winds 25 to 35 mph in the hills with gusts to 50 mph still looks on target for the North and East Bay hills. This will occur with little or no humidity recovery. Even hotter and drier Sunday with 100s becoming more widespread and hot temps pushing right towards the beaches. A second pulse of lighter offshore winds in the hills Sunday night into early Monday. Continued hot and dry Monday with widespread 90s and lower 100s. One item that may help to preclude heat headlines will be the longer nights and very dry airmass. This should allow decent overnight cooling, especially in the valleys while the hills remain warm as 850 mb temps will remain steady from 24-27 celsius.

Cooling trend looks minor/subtle for Tuesday/Weds as the ridge slowly shifts east and weakens with some type of onshore winds likely to return. But no rapid cool down in sight which is more common this time of year. Bottom line: a hot and dry weekend in storm with periods of offshore winds that will keep fire danger high at least through Monday.

PREV DISCUSSION. as of 3:00 AM PDT Wednesday . Once again, the marine layer compressed briefly during the late evening hours has since started to rebuild/deepen and is expected to continue to do grow back to between 1,000 and 1,200 feet Wednesday morning. Satellite shows a few high clouds passing over ahead of a week frontal system approaching the Oregon/California border, but mostly a cloud free evening, perfect for stargazers.

The 500 mb ridge is still expected to grow over the course of Wednesday, raising heights over the Bay Area between 590 and 592 dm, with its max closer to Los Angeles at 594 dm. Winds aloft will be out of the southwest, driving persistent onshore flow over the Bay Area and the Central Coast with cooler seasonal temperatures. Meanwhile to the north, a longwave trough extends down the Pacific Coastline with a weak cold front along its leading edge. As it approaches the Pacific Coastline from Washington down to Northern California, there is a chance of some light rain over the northern portions of our coastal waters and light drizzle along the Sonoma and Marin coastlines. But it will be light with little to no accumulation.

Zonal flow aloft over the Pacific Northwest develops on Friday as the upper level ridge of high pressure stretches eastward over Southern and Central California, amplifying the ridge and high pressure over the weekend which will start the next warming trend. Sunday Temperatures will have only a minor increase Friday, but 850 mb temperatures on both the GFS and Euro are still showing low 20s Celsius on Saturday, mid-20s on Sunday, and maxing at 27 degrees Celsius on Monday. While models have been consistently showing this pattern brining hot temperatures this weekend, models 24 hours prior were suggesting that Sunday would be the hottest day, however it may end up being Monday, but there's still time for that to flip back again. That being said, temperatures inland will be in the 80s and 90s on Saturday and on Sunday it is forecast to be in the 90s and low-100s. Coastal areas will be in the 70s and 80s, but could see additional warming depending on the reach of any offshore winds.

Beginning on Saturday, winds will shift to offshore and be out of the north, with gustier conditions at higher elevations. There is low confidence in the offshore winds mixing down to the surface for the additional coastal heating, but it will be monitored. The main area of threat will be the North Bay Mountains and East Bay Hills, with greater confidence in the North Bay. With fuels as dry as they are and the absence of a marine layer, these offshore winds have raised fire concerns. Yesterday, a Fire Weather Watch was issued valid from Saturday at 11 AM PDT to Monday at 8 AM PDT. Strongest wind gusts are expected at higher elevations and be 35 to 45 mph, with an occasional stronger gusts up to 50 mph.

Beyond that the warm and dry period continues as there is still no rain forecast. By Monday, the center of the ridge will likely move over the Nevada/California border at 595 dm and continue shifting eastward toward Colorado through the early part of next week. Temperatures on Tuesday will start to "cool", but that is relative to how hot it is expected to be on Monday. More importantly, as the ridge moves east, winds will switch back to onshore and become weaker.

AVIATION. As of 10:55 AM PDT Wednesday . Widespread VFR through the day and into the evening. Breezy to locally gusty onshore winds through coastal gaps today. Marine layer will return later tonight into tomorrow morning, though not expecting an extremely deep intrusion given later arrival. Generally borderline MVFR-IFR cigs for Bay Area shoreline, IFR for Monterey Bay/San Mateo coast, and VFR inland.

Vicinity of KSFO . VFR. West to northwest winds 15-18 kt gusting to 25 kt in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with onshore winds 5-10 knots in the afternoon. IFR cigs return tonight.

BEACHES. as of 4:43 AM PDT Wednesday . A deep low in the Gulf of Alaska will produce a large long-period swell train that will arrive late Thursday evening and into Friday morning. Swells by then could be up to 10 to 12 ft with a 16 to 18 second period. The main impacts will be increased wave heights breaking near the shoreline and an increased risk of rip currents developing along coastal beaches. With the increase in temperatures inland expected late in the week, beachgoers should be mindful of the increased wave activity and rip currents. The wave activity is forecast to gradually decrease through the weekend, but caution is advised through at least Sunday morning.

MARINE. as of 10:48 AM PDT Wednesday . A 980 mb low in the Gulf of Alaska will generate large long-period northwest swells that will arrive Thursday night and Friday. Swell heights generally around 10 to 12 feet and periods of 15 to 18 seconds are expected. High pressure off the central California coast will bring gusty winds to the southern waters through Friday while lighter winds prevail over the northern waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay from 2 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 2 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: RWW AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 1 mi63 min SSE 6 G 8 64°F 65°F1019.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 2 mi40 min SSE 8 67°F 1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 3 mi63 min SSW 4.1 G 6 65°F 1020.1 hPa
FTPC1 - 9414290 - San Francisco, CA 8 mi57 min 64°F
PXSC1 8 mi57 min 65°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 9 mi57 min N 2.9 G 2.9 63°F 1018.7 hPa
OBXC1 9 mi81 min 65°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 9 mi57 min SSW 4.1 G 6 67°F 1019.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi57 min SSW 5.1 G 6
LNDC1 11 mi57 min WSW 4.1 G 4.1 67°F 1019.6 hPa
AAMC1 - 9414750 - Alameda, CA 12 mi57 min 67°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 13 mi57 min WNW 4.1 G 6 71°F 1019 hPa
46237 - San Francisco Bar, CA (142) 15 mi75 min 59°F3 ft
UPBC1 18 mi57 min WNW 8 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 18 mi57 min WNW 11 G 12 71°F 69°F1019 hPa
PCOC1 - 9415144 - Port Chicago, CA 22 mi57 min W 15 G 16 71°F 69°F1018.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 25 mi45 min WNW 5.8 G 7.8 59°F1020.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 28 mi90 min SSW 12
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 29 mi57 min NW 11 G 17 73°F 1018.1 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi57 min NNE 4.1 G 6 69°F 73°F1020.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 46 mi45 min NNW 7.8 G 9.7 62°F 1020.7 hPa60°F

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA17 mi20 minN 010.00 miFair81°F51°F37%1018.6 hPa
Oakland, Metro Oakland International Airport, CA19 mi22 minWSW 510.00 miFair72°F54°F53%1019.6 hPa
Concord, Buchanan Field, CA20 mi22 minWNW 810.00 miFair82°F46°F29%1017.2 hPa
Napa, Napa County Airport, CA21 mi21 minS 810.00 miFair75°F52°F45%1018 hPa
San Francisco, San Francisco International Airport, CA21 mi19 minWNW 1410.00 miA Few Clouds73°F54°F51%1019.5 hPa
Hayward, Hayward Air Terminal, CA24 mi21 minW 510.00 miFair75°F48°F39%1020.3 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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N4E3--E3--CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day ago4SE5E7S9SW12SW8
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S7E5NE8Calm--CalmCalmNE3CalmCalmCalmCalmCalmCalmCalmCalm3
2 days agoSE45SE5CalmNW7W8
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Tide / Current Tables for Richmond, Chevron Oil Pier, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Richmond
Click for Map
Wed -- 06:27 AM PDT     4.72 feet High Tide
Wed -- 06:58 AM PDT     Sunrise
Wed -- 11:16 AM PDT     2.82 feet Low Tide
Wed -- 02:13 PM PDT     Moonrise
Wed -- 05:18 PM PDT     6.14 feet High Tide
Wed -- 06:56 PM PDT     First Quarter
Wed -- 07:03 PM PDT     Sunset
Wed -- 11:50 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.71.62.63.64.34.74.74.33.73.12.82.93.44.25.15.86.165.44.431.70.7

Tide / Current Tables for Red Rock .1 E, San Francisco Bay, California Current
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Red Rock .1 E
Click for Map
Wed -- 01:02 AM PDT     0.00 knots Slack
Wed -- 04:20 AM PDT     1.32 knots Max Flood
Wed -- 06:58 AM PDT     Sunrise
Wed -- 08:06 AM PDT     -0.01 knots Slack
Wed -- 10:02 AM PDT     -0.78 knots Max Ebb
Wed -- 01:02 PM PDT     0.00 knots Slack
Wed -- 02:13 PM PDT     Moonrise
Wed -- 04:03 PM PDT     0.85 knots Max Flood
Wed -- 06:56 PM PDT     First Quarter
Wed -- 07:04 PM PDT     Sunset
Wed -- 07:12 PM PDT     -0.00 knots Slack
Wed -- 10:20 PM PDT     -1.66 knots Max Ebb
Wed -- 11:50 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-00.61.11.31.310.60.1-0.5-0.8-0.7-0.4-00.40.70.90.80.50.1-0.5-1.2-1.6-1.6

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
Ground Weather Radar Station Sacramento, CA
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