Wednesday, October28, 2020
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Marine Weather and Tides
Muir Beach, 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 7:30AMSunset 6:16PM Wednesday October 28, 2020 6:51 PM PDT (01:51 UTC) Moonrise 4:21PMMoonset 3:42AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 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- 204 Pm Pdt Wed Oct 28 2020
Rest of today..W winds around 5 kt. Wind waves 1 ft. NW swell 2 to 3 ft at 10 seconds and nw up to 2 ft at 12 seconds.
Tonight..NW winds up to 10 kt. Wind waves 1 ft. NW swell 2 to 3 ft at 10 seconds and nw up to 2 ft at 12 seconds.
Thu..NW winds up to 10 kt. Wind waves 1 ft. NW swell around 2 ft at 9 seconds.
Thu night..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell around 2 ft at 8 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell around 2 ft at 10 seconds.
Fri night..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell around 2 ft at 9 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 2 to 3 ft and sw up to 2 ft.
Sun..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell 2 to 4 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 2 to 3 ft with a dominant period of 13 seconds. Across the bar...seas 4 to 5 ft with dominant swell period of 13 seconds. Maximum ebb current of 2.9 kt at 03:31 pm Wednesday and 1.7 kt at 03:43 am Thursday.
PZZ500 204 Pm Pdt Wed Oct 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds will prevail through much of the rest of the week with south to southwest over most of the waters into tonight. Winds will shift back out of the northwest by tomorrow before winds increase slightly Friday and into Saturday. Mixed seas will persist through the period with a pair of northwest swell trains in addition to a lighter southerly swell and some weak wind waves.


7 Day Forecast for Marine Location Near Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 282356 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 456 PM PDT Wed Oct 28 2020

SYNOPSIS. High pressure will bring sunny, mild afternoons and cool, clear nights through the remainder of the week. A slight warming trend is then forecast this weekend with continued dry weather conditions.

DISCUSSION. as of 02:28 PM PDT Wednesday . Hazy skies are being observed in a few locations along the Central Coast and South Bay this afternoon as elevated smoke from the active fires along the Sierra Crest has continued to flow in the direction of our southern CWA. Visible satellite imagery shows much of the elevated smoke exiting over our southern waters. Meanwhile, the Farallones measured clear skies this afternoon, which is in concert with the clear conditions over much of the Bay Area. Some haze has been observed in portions of the North Bay as well, but most of it is from the fires in Northern California and still very elevated.

The 550dm 500 hPa trough that helped to mix the incredibly dry and windy air mass all the way down to the coast is now well past the lee of the Rockies and centered over the Texas Panhandle. In its wake, its exit has allowed for the axis of the 588dm 500 hPa ridge to slowly inch its way towards the West Coast. As it does so, have seen a gradual weakening of winds at all elevations of our CWA, along with subtle warming trend that is expected to continue through Thursday afternoon. With the exception of Friday, Max temps will continue to increase through the rest of the week, reaching the low 80s F across much of the interior, while some of our warmest locations will get into the mid-80s F. Along the coast, can expect widespread 70s F.

Daytime highs will drop off across much of the interior by a few degrees on Friday as the ridge weakens some and allows for a weak trough to influence the California Coast. Local WRF picks up very well on this brief passage and suggests greater deepening of the marine layer, especially along the SF Peninsula that could get into parts of the Bay Shoreline. Increase in onshore flow looks set to also affect parts of the Delta Friday. As such, expecting for the continuation of improved RH recoveries along the coast and the immediate interior through the rest of the workweek. Overall, this trough will be a brief setback in the warming trend that for the rest of the week. it should be noted that because it is fall we will also continue experiencing greater day-to-night temp variations across the entire CWA, especially in interior valleys regionwide.

In terms of whether or not we can expect any sort of rain relief, members from both the ECMWF ENS and GEFS are still in fair agreement that following the ridge resurgence this weekend, can expect another trough to move into the PAC NW. This setup will introduce moisture to that area sometime early next week. As for Northern and Central California, a couple more ECMWF ENS and GEFS members are suggesting that enough PAC moisture could potentially allow for some precipitation to move down to portions of our CWA during that period. Nonetheless, still several days out and has been seen in the past, may still end up with null precip and a dry frontal passage. Speaking of which, members are also suggesting yet another offshore signature during the early part of next week as the axis of the trough comes ashore. All in all, the setup for next week still remains rather variable so will be monitoring closely as newer runs come in and pattern becomes clearer.

AVIATION. as of 4:56 PM PDT Wednesday . For 00z tafs. VFR conditions through the period as a predominately dry air mass remains over the region. Satellite imagery shows clear skies over land and some stratus just offshore of northern Sonoma and southern Mendocino counties, but not expecting any impacts on terminals overnight. Coastal profilers show the shallow marine layer from this morning has been mixed out. Not expecting a return of the marine layer through the TAF period, with continued light offshore flow aloft, and dry conditions at the surface. Winds generally light and variable through the evening and overnight hours.

Vicinity of KSFO . VFR through the period. Winds have turned onshore at 9-10 kt and should remain so through around 05z, then becoming light and variable. Return of onshore flow expected late Thursday afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through the period. Some clouds about 20 miles offshore approaching the coastline, but will likely dissipate before reaching land. Light onshore winds but breezier down the Salinas Valley. Winds become light overnight with mostly clear skies. Onshore flow returns Thursday afternoon.

MARINE. as of 2:04 PM PDT Wednesday . Generally light winds will prevail through much of the rest of the week with south to southwest over most of the waters into tonight. Winds will shift back out of the northwest by tomorrow before winds increase slightly Friday and into Saturday. Mixed seas will persist through the period with a pair of northwest swell trains in addition to a lighter southerly swell and some weak wind waves.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.

PUBLIC FORECAST: Diaz/RWW AVIATION: Lorber MARINE: AS

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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) 2 mi51 min 58°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi31 min NNW 7.8 G 9.7 58°F1017.7 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi57 min WSW 6 G 8 60°F 61°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi46 min Calm 65°F 1016 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi57 min WSW 7 G 13 65°F
PXSC1 15 mi57 min 67°F
RCMC1 - 9414863 - Richmond, CA 17 mi57 min SW 1 G 2.9 66°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi57 min WNW 9.9 G 12 63°F
OBXC1 18 mi57 min 64°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi57 min WNW 1.9 G 4.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi57 min WSW 5.1 G 8 64°F
AAMC1 - 9414750 - Alameda, CA 20 mi57 min WNW 5.1 G 6 67°F 63°F
LNDC1 21 mi57 min N 2.9 G 5.1 69°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi57 min ENE 4.1 G 6 72°F
RTYC1 - 9414523 - Redwood City, CA 31 mi57 min N 6 G 7 68°F 67°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi31 min WNW 5.8 G 7.8 58°F 1017.6 hPa55°F
UPBC1 34 mi57 min E 5.1 G 6
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi57 min NE 5.1 G 5.1 68°F 64°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi57 min ENE 4.1 G 5.1 66°F 64°F
46214 - Point Reyes, CA (029) 43 mi55 min 59°F5 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi57 min SE 2.9 G 5.1 66°F
SFXC1 - San Francisco Bay Reserve, CA 45 mi66 min SE 1.9
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi31 min WNW 5.8 G 7.8 52°F 57°F1017.3 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA20 mi55 minNW 710.00 miFair68°F34°F28%1016.5 hPa
Half Moon Bay Airport, CA21 mi56 minWNW 46.00 miFair with Haze59°F53°F82%1017.6 hPa
Oakland, Metro Oakland International Airport, CA24 mi58 minWNW 510.00 miFair71°F44°F38%1016.8 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW10NW8W4W6NW8NW9S3NW4W4SW4W3SW4NW5CalmN3CalmCalmNE4NE3CalmCalmNE5NW9NW7
1 day agoW14W9NW9N4W6CalmSW3SW3CalmSW4SW3SE6E13E6NE8CalmE33NE4CalmN3NE6N5NW10
2 days agoW16W14W10N18N10NE19
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NE27N21N19NE11E15E9E12E12NE4N4CalmCalmCalmW14

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Wed -- 03:27 AM PDT     0.90 feet Low Tide
Wed -- 04:41 AM PDT     Moonset
Wed -- 07:32 AM PDT     Sunrise
Wed -- 10:08 AM PDT     5.38 feet High Tide
Wed -- 04:11 PM PDT     1.08 feet Low Tide
Wed -- 05:20 PM PDT     Moonrise
Wed -- 06:15 PM PDT     Sunset
Wed -- 10:20 PM PDT     4.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.32.31.40.911.52.33.34.255.45.24.43.42.31.41.11.21.82.63.54.34.74.6

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 01:36 AM PDT     -1.28 knots Max Ebb
Wed -- 04:41 AM PDT     Moonset
Wed -- 04:51 AM PDT     0.00 knots Slack
Wed -- 07:32 AM PDT     Sunrise
Wed -- 07:58 AM PDT     1.27 knots Max Flood
Wed -- 11:12 AM PDT     -0.00 knots Slack
Wed -- 02:06 PM PDT     -1.31 knots Max Ebb
Wed -- 05:20 PM PDT     Moonrise
Wed -- 05:21 PM PDT     0.01 knots Slack
Wed -- 06:15 PM PDT     Sunset
Wed -- 08:21 PM PDT     1.18 knots Max Flood
Wed -- 11:31 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.9-1.2-1.3-1.1-0.60.10.71.11.31.10.80.1-0.6-1.1-1.3-1.2-0.9-0.30.40.91.21.10.90.3

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 San Francisco Bay Area, CA
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