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Marine Weather and Tides Marin City, 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.

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Sunrise 6:53AM

Sunset 7:14PM

Friday September 18, 2020 10:56 AM PDT (17:56 UTC)

Moonrise 7:15AM

Moonset 7:26PM

Illumination 2%

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.

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7 Day Forecast for Marine Location Near Marin City, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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FXUS66 KMTR 181745 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1045 AM PDT Fri Sep 18 2020

SYNOPSIS. A weak front will clip the North Bay today while mid- level moisture streams across Monterey and San Benito Counties. Otherwise, a cool down today and tomorrow followed by near normal temperatures, especially in the interior, this weekend. Another slight cooldown expected primarily across the interior during the early part of next week before temps rebound again.

DISCUSSION. as of 09:25 AM PDT Friday . The forecast is still on track for this afternoon. Some areas saw drizzle and patches of moderate fog to start the day. Cloud cover from the remnants of Karina is still pushing into areas as far north as Alameda Co and is being met with more stratiform clouds associated with a low pressure moving into the Pacific Northwest.

PREV DISCUSSION. As of 3:05 AM PDT Thursday . WNW winds are being measured at higher-terrain stations in the North and East Bays and the SF Peninsula as the cold front associated with the 564dm 500hPa trough off the PAC NW coast continues to slowly inch its way towards the Oregon shoreline. Moisture associated with the trough has evolved into convection and rain over Oregon and Washington State while moisture returns further down in extreme NorCal have been minimal, at best. Back here in the CWA, the moisture that has been moving over the Central Coast for most of the day is associated with the remnants of tropical storm Karina. While there were some minor concerns for overnight high-based convection with dry lightning (which was a fair concern if we recall the aftermath of the remnants from Genevieve last month), the bulk of the moisture looks to be moved out of the Central Coast by the cold frontal passage by mid-morning. GOES-17 has picked up the lightning strikes over the PAC NW tonight but for us, only seeing a continuation of the moisture transport from Karina in the form of a long stretch of alto-cu and the possibility for some patchy drizzle along our coastal locations through the morning. Nevertheless, will continue to monitor the moisture plume through the rest of the morning.

HRRR-07Z 850hPA winds and temperature capture the wind shift and the frontal passage already being observed in higher-terrain locations. As the surface front clips the entire CWA this morning, some uncertainty exists over how quickly coastal clearing occurs. Fort Ord Profiler has observed an uptick in the marine layer depth within the last couple of hours. That being said, the early-to-mid morning marine layer inversion will likely not be very strong given the cold frontal passage. Could see coastal clearing by mid-to-late morning as a result in a north- south fashion. The possibility for the coastal clearing to occur closer to noon is still on the table, however, given surface low- level mixing may be delayed due to weak winds within the lower atmosphere.

Looking into Friday afternoon and the rest of this upcoming weekend, cold frontal passage will substantially cool down the interior, which for the last couple of days has benefited from greater diurnal heating as smoke has cleared out over much of the CWA since this past Wednesday. Cool down will run through Saturday as the axis of the upper-level trough comes ashore and moves east towards the Canadian Prairies/Montana. As it exits the West Coast, a subtle ridge axis will settle around 125W and allow for a gradual rebound in interior max temps on Sunday. Some locations, like Livermore and San Jose, may observe max temps that are as much as 8 degrees F warmer than Friday.

In terms of air quality for this upcoming weekend, conditions may potentially deteriorate in the North Bay as HRRRx vertically integrated smoke product picks up on the smoke canopy from the August Complex being advected to Napa and Sonoma Counties following the cold frontal passage and the subsequent introduction of more northerly flow.

Model guidance brings a shortwave trough into the PAC NW next Monday around the same location where our upper-level trough is currently located. Interior locations in our CWA will subsequently experience a gradual cooldown through next Wednesday, removing diurnal gains from the weekend. Nevertheless, following this shortwave, high ensemble member confidence in upper-level ridging to return to the West Coast. Not expecting significant building but should see temps return to seasonal average through the second half of next week.

The last couple of GFS and CMC ensemble runs (including the latest 00Z 9/18 runs) have hinted at the possibility of a possible offshore wind event through the end of next week, with the signature being the most pronounced on the GFS members. Nevertheless, these runs are well over 200 hours out for respective ensembles and have little certainty at this time. For now, this is far enough out that it shouldn't raise of too many eyebrows, but should keep an eye on it in the coming days.

AVIATION. As of 10:45 AM PDT Friday . for 18Z TAFS. VFR with high clouds moving over the general region from both a weak cold front to the north and the remnants of tropical system Karina to the south. Breezy onshore winds expected this afternoon with a few stronger gusts possible. Expecting a return of the marine layer for IFR-MVFR cigs for tonight as winds ease.

Vicinity of KSFO . VFR, though a patch of thickening clouds sits just to the west over Half Moon Bay. Most cloud cover Friday afternoon should be from passing high clouds. Winds are still forecast to be from the west and increase strengthen into the afternoon to around 15k gust 20kt. Borderline IFR-MVFR cigs overnight.

SFO Bridge Approach . Similar to SFO.

Monterey Bay Terminals . High clouds continue to pass over the terminals, but otherwise VFR with onshore flow. Winds remain onshore and breezy Friday afternoon with a few stronger gusts through the Salinas valley. Cigs lower once again overnight for IFR conditions.

MARINE. as of 08:30 AM PDT Friday . Light northwest winds with locally stronger northwest winds south of Pigeon Point, into the northern Monterey Bay, and south of Point Sur along the Big Sur coast. Winds are forecast to increase Saturday. Mixed seas prevail with a shorter period northwest swell and a moderate period south to southwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay from 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: BFG/BKM/Diaz/AS AVIATION: DK MARINE: DK

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA	3 mi	52 min	S 8	64°F			1017 hPa
FTPC1 - 9414290 - San Francisco, CA	5 mi	63 min	WNW 2.9 G 5.1	62°F	64°F		1016.7 hPa
RCMC1 - 9414863 - Richmond, CA	6 mi	63 min	SSW 5.1 G 6	64°F	65°F		1016.2 hPa
PXSC1	7 mi	63 min		64°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	8 mi	63 min	W 7 G 12	64°F			1015.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	8 mi	63 min	SW 8 G 9.9	63°F			1016.8 hPa
46237 - San Francisco Bar, CA (142)	9 mi	57 min			61°F	3 ft
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	10 mi	63 min	W 8 G 8.9
OBXC1	10 mi	63 min		64°F				64°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	10 mi	63 min	W 6 G 7	63°F			1016.5 hPa
AAMC1 - 9414750 - Alameda, CA	13 mi	63 min	W 5.1 G 6	64°F	67°F		1016.6 hPa
LNDC1	13 mi	63 min	W 4.1 G 6	65°F			1016.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	18 mi	63 min	WSW 6 G 8.9	66°F			1015.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA	20 mi	37 min	SSW 1.9 G 3.9		61°F		1017 hPa
UPBC1	23 mi	63 min	WNW 7 G 12
MZXC1 - 9415102 - Martinez-Amorco CA	23 mi	63 min	WNW 8.9 G 11	67°F	68°F		1015.9 hPa
PCOC1 - 9415144 - Port Chicago, CA	28 mi	63 min	W 8.9 G 12	67°F	68°F		1015.7 hPa
RTYC1 - 9414523 - Redwood City, CA	29 mi	63 min	WNW 1.9 G 1.9	67°F	73°F		1016.9 hPa
SFXC1 - San Francisco Bay Reserve, CA	34 mi	72 min	W 8.9
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	35 mi	63 min	W 8.9 G 15	67°F			1015.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	41 mi	37 min	Calm G 1.9	61°F			1017.3 hPa	61°F

Wind History for San Francisco, CA

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Oakland, Metro Oakland International Airport, CA	19 mi	64 min	Var 4	10.00 mi	Partly Cloudy	70°F	59°F	68%	1016.5 hPa
San Francisco, San Francisco International Airport, CA	19 mi	61 min	WNW 10	10.00 mi	A Few Clouds	69°F	57°F	68%	1016.2 hPa
Novato / Gnoss Field, CA	19 mi	82 min	N 4	10.00 mi	Fair	68°F	62°F	83%	1015.9 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)

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Tide / Current Tables for Sausalito, Corps of Engineers Dock, San Francisco Bay, California

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Tide / Current Tables for Richardson Bay Entrance, San Francisco Bay, California Current

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Weather Map

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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

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Ground Weather Radar Station San Francisco Bay Area, CA

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