Monday, April19, 2021
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Marine Weather and Tides
San Francisco, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:26AMSunset 7:50PM Monday April 19, 2021 1:52 PM PDT (20:52 UTC) Moonrise 10:40AMMoonset 1:08AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 848 Am Pdt Mon Apr 19 2021
.small craft advisory in effect from 3 pm pdt this afternoon through this evening...
Today..SW winds up to 10 kt, becoming W 10 to 20 kt with gusts up to 30 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 30 kt.
Tue..W winds 15 to 25 kt with gusts up to 30 kt.
Tue night..SW winds up to 10 kt.
Wed..W winds 5 to 15 kt.
Wed night..W winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
PZZ500 848 Am Pdt Mon Apr 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase through the day as a disturbance moves southward from the pacific northwest into northern california. Gale force gusts are expected to develop over portions of the coastal waters starting with the big sur coast by late this afternoon before winds increase over the northern waters this evening and persist into Tuesday. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.


7 Day Forecast for Marine Location Near San Francisco, CA
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location: 37.81, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 191847 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1147 AM PDT Mon Apr 19 2021

SYNOPSIS. A cooling trend begins today with breezier onshore winds and a deepening marine layer. More widespread cooling is forecast for Tuesday as temperatures return to seasonal averages. Dry and seasonable conditions then persist through Friday. The weekend will bring cooler temperatures and increasing chances for rain late Saturday and Sunday.

DISCUSSION. as of 08:52 AM PDT Monday . Temperatures across the region this morning range from the mid 40s to mid 50s with widespread stratus. These low clouds will begin to dissipate over inland areas through the morning and early afternoon while likely holding near the coastline through much of the day. As the ridge aloft begins to flatten, the air mass will begin to cool which will translate to a cooling trend across the interior today. However, inland areas will still experience afternoon temperatures above seasonal averages today. This said, no updates are needed to the ongoing forecast this morning. For complete details, please see the previous forecast discussion below.

PREV DISCUSSION. as of 03:35 AM PDT Monday . The marine layer has deepened to around 1000 ft, as the upper ridge begins to weaken its grip over our area. Stratus has developed along the coast from Sonoma through the Central Coast and will advance farther inland as the morning progresses. Temperatures are running a few degrees warmer than 24 hours ago at most sites, as a result of the much above normal temperatures experienced yesterday. Today will be another above normal day away from the coast, as a weak ridge remains over our area and 850 mb temps peak. Areas closer to the ocean and bays will cool by a couple to perhaps up to 12 degrees, as stronger onshore flow returns. This will translate to 50s and 60s along the immediate coast, upper 60s to low 70s along the SF Bay shoreline, and low to mid 80s in the inland valleys. Winds may also become pretty gusty in the late afternoon and evening as an upper low forms off the Oregon coast and moves over northern CA.

Tuesday, the area will experience more widespread cooling under the influence of the upper low, with the most significant cooling occuring inland. This basically means a return to near-normal temperatures region-wide. Unfortunately, models keep all precip associated with the low to the north and east of our area.

Wednesday through Friday do not bring any changes to our area in terms of sensible weather. As the low moves east, we become situated between a trough over the inter-mountain west and a ridge several hundred miles off the coast. Temperatures will be near normal, and a marine layer will provide continued night and morning low clouds.

Saturday, an upper low approaches the PacNW, bringing cooling to the coast. Both the ECMWF and GFS bring precip to northern CA Saturday afternoon, but leave our area dry until Sunday morning. There is some disagreement on the path and timing of the low at this point. The ECMWF develops a deep trough off the northern CA coast, which pivots over our area late Sunday, bringing wetting rain to much of the state. The GFS keeps the closed low off the northern coast until Monday afternoon with wetting rain preceding it Sunday afternoon and evening. Ensemble members are also coming together for light to moderate precip in the late Sunday to early Tuesday timeframe. Our forecast reflects this increasing confidence, with chance pops and light qpf across the region Sunday and Monday. Guardedly optimistic at this point, as we're still six days out.

AVIATION. As of 11:30 AM PDT Monday . For the 18Z TAFs. Most inland sites VFR, with coastal sites at MVFR/IFR. Improvements to VFR for coastal sites should be seen by 19-20Z. KMRY could see MVFR until 20Z. VFR conditions around the area after 21Z and lasting through 06-08Z tonight. W/NW winds breezy this afternoon, around 10-15kts. Gusts between 20-25 kt possible, generally, through early tomorrow morning with stronger gust potential for SFO. Winds will remain light to moderately breezy through the night for most areas, preventing FG/BR for KSTS/KAPC Tuesday morning.

Vicinity of KSFO . Satellite shows cloud deck mixing out quickly, with skies FEW-SCT at 080-013. Skies will clear up this afternoon. W/NW winds will increase this afternoon to 20-25+ knots lasting through Tuesday evening. Strongest gusts will be from 09-12Z this morning, with models hinting at G30kts. Will be monitoring for AWW criteria. Winds will relax to 15G20kts for the remainder of Tuesday. Low clouds will return tonight, with prevailing deck SCT010-015.

SFO Bridge Approach . Stratus deck will fill in from 09-16Z, with more confidence for SCT-BKN cigs at 010-015.

Monterey Bay Terminals . The marine layer is about an hour away from scattering out, with KSNS seeing SCT013 already. VFR conditions expected this afternoon before low clouds return this evening and tonight. Light winds this morning increasing this afternoon to around 15 kt. Breezy conditions may linger into the evening.

MARINE. as of 11:28 AM PDT Monday . Northwest winds will increase through the day as a disturbance moves southward from the Pacific Northwest into northern California. Gale force gusts are expected to develop over portions of the coastal waters starting with the Big Sur Coast by late this afternoon before winds increase over the northern waters this evening and persist into Tuesday. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.

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 Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: RGass/Lorber AVIATION: Dhuyvetter MARINE: Dhuyvetter

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi52 min WSW 8 G 18 53°F 57°F1019.9 hPa (-0.8)
PXSC1 2 mi52 min 55°F 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi52 min W 4.1 G 15 53°F 1019.3 hPa (-0.5)
OBXC1 5 mi52 min 54°F 49°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi52 min WSW 8 G 9.9
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi71 min SE 14 53°F 1019 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi52 min W 6 G 8 55°F 1020.2 hPa (-0.5)
AAMC1 - 9414750 - Alameda, CA 8 mi52 min SW 11 G 12 53°F 62°F1020.5 hPa (-0.6)
LNDC1 8 mi52 min SSW 6 G 8 54°F 1020.1 hPa (-0.6)
RCMC1 - 9414863 - Richmond, CA 8 mi52 min SSE 12 G 17 54°F 60°F1019.5 hPa (-0.7)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi52 min S 16 G 20 53°F 1020.2 hPa (-0.4)
46237 - San Francisco Bar, CA (142) 10 mi52 min 54°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi52 min WSW 8 G 11 61°F 1018.5 hPa (-0.7)
CQUC1 21 mi63 min 61°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi32 min NW 16 G 21 50°F1021 hPa
UPBC1 23 mi52 min WNW 11 G 15
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi52 min WNW 11 G 14 65°F 62°F1018.4 hPa (-0.7)
RTYC1 - 9414523 - Redwood City, CA 24 mi52 min NNW 11 G 16 59°F 1020.4 hPa (-0.8)
PCOC1 - 9415144 - Port Chicago, CA 27 mi52 min W 14 G 17 64°F 62°F1018.1 hPa (-0.8)
PRYC1 - 9415020 - Point Reyes, CA 31 mi52 min 51°F1020.7 hPa (-0.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi52 min NW 12 G 18 66°F 1017.4 hPa (-0.8)
SFXC1 - San Francisco Bay Reserve, CA 35 mi67 min W 12 69°F 1019 hPa49°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 39 mi32 min NW 14 G 18 50°F 1022 hPa47°F
BDXC1 48 mi46 min 50°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA14 mi59 minW 710.00 miA Few Clouds57°F47°F69%1020.5 hPa
San Francisco, San Francisco International Airport, CA14 mi56 minWNW 16 G 209.00 miA Few Clouds61°F45°F56%1020.1 hPa
Hayward, Hayward Air Terminal, CA20 mi58 minW 810.00 miFair60°F47°F62%1020.9 hPa
Half Moon Bay Airport, CA21 mi57 minNNW 84.00 miPartly Cloudy with Haze50°F46°F88%1021.7 hPa
San Carlos Airport, CA22 mi65 minW 810.00 miA Few Clouds63°F45°F52%1020.3 hPa
Concord, Buchanan Field, CA24 mi59 minW 910.00 miFair74°F43°F33%1016.8 hPa
Novato / Gnoss Field, CA24 mi57 minSE 610.00 miFair68°F52°F56%1018.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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NW16W15NW13NW10NW14NW13NW11W11W7W11W6W5W7W10NW9W11NW14W16
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NW15NW8NW13NW12NW11NW8W8W7NW9W7W7W3CalmCalmE4NE3NE3N3
2 days agoW20
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Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Mon -- 02:08 AM PDT     Moonset
Mon -- 04:27 AM PDT     4.78 feet High Tide
Mon -- 06:28 AM PDT     Sunrise
Mon -- 11:40 AM PDT     Moonrise
Mon -- 11:46 AM PDT     0.20 feet Low Tide
Mon -- 07:49 PM PDT     Sunset
Mon -- 08:01 PM PDT     4.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.53.84.14.54.84.74.43.62.61.60.80.30.20.40.91.62.333.644.143.83.5

Tide / Current Tables for Golden Gate Bridge .8 mi E ., San Francisco Bay, California Current
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Golden Gate Bridge .8 mi E .
Click for Map
Mon -- 01:12 AM PDT     0.00 knots Slack
Mon -- 02:08 AM PDT     Moonset
Mon -- 03:56 AM PDT     0.93 knots Max Flood
Mon -- 06:14 AM PDT     -0.00 knots Slack
Mon -- 06:28 AM PDT     Sunrise
Mon -- 10:24 AM PDT     -2.23 knots Max Ebb
Mon -- 11:40 AM PDT     Moonrise
Mon -- 02:24 PM PDT     0.00 knots Slack
Mon -- 05:35 PM PDT     2.07 knots Max Flood
Mon -- 07:49 PM PDT     Sunset
Mon -- 09:07 PM PDT     -0.00 knots Slack
Mon -- 11:18 PM PDT     -0.84 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-0.10.30.70.90.70.2-0.4-1-1.7-2.2-2.1-1.6-1-0.30.61.5221.81.10.1-0.5-0.8

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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