Tuesday, September22, 2020
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Marine Weather and Tides
Pacifica, 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 6:56AMSunset 7:09PM Monday September 21, 2020 9:17 PM PDT (04:17 UTC) Moonrise 10:56AMMoonset 9:16PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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- 843 Pm Pdt Mon Sep 21 2020
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 8 seconds and sw around 2 ft at 19 seconds.
Tue..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 9 seconds and sw around 2 ft at 18 seconds.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. NW swell 4 to 6 ft at 11 seconds and sw around 2 ft at 17 seconds.
Wed..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 11 seconds and sw around 2 ft at 16 seconds.
Wed night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Thu..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 5 to 7 ft at 17 seconds and sw around 2 ft at 19 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 9 to 11 ft at 16 seconds and S around 2 ft at 18 seconds.
Fri..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 9 to 11 ft and sw around 2 ft.
Sat..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 3 to 4 ft with dominant swell period of 7 seconds. Across the bar...seas 4 to 5 ft with dominant swell period of 7 seconds. Maximum ebb current of 1.8 kt at 09:07 am Tuesday and 3.6 kt at 08:19 pm Tuesday.
PZZ500 843 Pm Pdt Mon Sep 21 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northwest winds over the northern and inner coastal waters tonight and Tuesday, winds easing Tuesday night into Wednesday morning. Mixed seas will persist with a shorter period northwest swell and a long period southwest swell. A more robust northwest swell will arrive across the waters by Friday morning.


7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 220357 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 857 PM PDT Mon Sep 21 2020

SYNOPSIS. A seasonable weather pattern through midweek with temperatures running near normal. A dry cold front passes through the Bay Area on Thursday that will keep persistent onshore winds in place into Friday. Dramatic change in store for the weekend as high pressure quickly builds with increasing offshore wind pattern. Temperatures rapidly warming over the weekend with periods of offshore winds that will increase fire weather concerns as hot afternoons, low humidity and breezy offshore winds coincide. Strong ridge to stay in place at least through early next week.

DISCUSSION. as of 08:56 PM PDT Monday . Regional profilers continue to indicate a marine layer between 800-1,200 feet in depth this evening with stratus developing along the San Mateo Coastline to around portions of the Monterey Bay Region. Aloft, a short-wave trough pushing into northern California has allowed for mid/high level clouds to advect inland over the region. This may keep the boundary layer mixed a bit, yet still do expect low clouds to become a bit more widespread into Tuesday morning. With slight cooling aloft, look for temperatures to remain near to slightly below seasonal averages through the first half of the week with day-to-day fluctuations in the marine layer and associated coastal clouds. This said, the ongoing forecast remains on track with no updated anticipated at this time. For additional details, please see the previous forecast discussion below.

PREV DISCUSSION. as of 2:19 PM PDT Monday . Todays focus has actually been on the long range forecast and its potential impacts this weekend with less focus on the short term.

Short term: Marine layer locally just over 1200 feet with low clouds confined to the Monterey peninsula this afternoon while all other locations remain sunny. 24 hour temp trends show significant cooling compared to Sunday afternoon with most places running 4-8 degrees cooler while Watsonville and Salinas are running close to 20 degrees cooler. Weather pattern tonight through Weds will be zonal/onshore with some shortwave ridging by Weds. This should translate to seasonable temps with 70s/80s inland.

By Thursday a cold front will move into Northern California. Any rain looks to stay from Mendocino northward with perhaps some coastal drizzle, especially for the Sonoma coast on Thursday. Behind the front persistent onshore winds and lowering heights on Friday will keep temps running near to slightly below normal.

All attention then turns to the weekend forecast. Confidence increasing for potentially significant offshore wind event. Temps will warm rapidly on Saturday with highs bouncing well back into the 80s and lower 90s as a 594dm high builds off the coast with some offshore winds near the surface. Ensemble solutions remain consistent with building ridge leading to hotter temps and stronger offshore winds into Sunday. Would expect widespread highs into the 90s and even some lower 100s. The dry airmass will allow for decent night time cooling that should preclude widespread significant heat impacts though even the overnight lows will remain warmer than normal where the offshore winds blow all night.

Right now the peak of the winds looks to be Sunday morning for the North and East Bay hills but still several days out to dial in the details and exact timing. Confidence is high overall and Sunday does look to be hotter than Saturday as heights builds to at least 596dm with persistent offshore/drying winds. Interestingly enough the pattern looks to take hold for several days with the ridge anchored along the West Coast at least through Weds of next week. Right now the only hope of cooling looks to be a southerly wind reversal along the coast.

AVIATION. As of 5:34 PM PDT Monday . for 00Z TAFS. VFR across all terminals. Satellite imagery shows stratus has eroded from most areas, except for pockets in southern Monterey Bay and off the coast near Half Moon Bay. WNW winds are providing breezy conditions with a few stronger gusts through coastal gaps. Forecast calls for the marine layer to deepen through tonight, bringing lower clouds further inland overnight. Clouds are expected to scatter out on Tuesday morning by 17z.

Vicinity of KSFO . VFR, with a few clouds around 13k ft lingering around the terminal. Haze was reported earlier in the afternoon from PIREPs and surface obs but it appears to have mostly cleared out. The marine layer is expected to deepen overnight allowing the stratus to move back into the Bay Area for MVFR cigs overnight, possibly lowering to IFR. Clearing after 17z. Winds will increase Monday afternoon with strongest winds up to 20 kts

SFO Bridge Approach . Possible lowered slant-range vis from haze, otherwise similar to KSFO.

Monterey Bay Terminals . VFR for the terminals with low clouds lingering over southern and coastal portions of the bay. VFR should prevail into early evening with IFR/LIFR cigs moving in after approximately 04z. Breezy onshore winds continuing through early evening and calming overnight. Clearing expected after 17z on Tuesday with continued onshore flow for the afternoon.

MARINE. as of 08:56 PM PDT Monday . Gusty northwest winds over the northern and inner coastal waters tonight and Tuesday, winds easing Tuesday night into Wednesday morning. Mixed seas will persist with a shorter period northwest swell and a long period southwest swell. A more robust northwest swell will arrive across the waters by Friday morning.

BEACHES. as of 02:34 PM PDT Monday . A larger northwest swell arrives late Thursday evening and into Friday morning. 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 this weekend, 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.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Reyes to Pigeon Pt 0-10 nm until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 AM



PUBLIC FORECAST: RGass/RWW AVIATION: Lorber/Canepa MARINE: Canepa BEACHES: DK

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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) 13 mi47 min 59°F4 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi47 min SW 8.9 G 13 61°F 62°F1013.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi47 min E 1.9 G 5.1 62°F 1012.4 hPa
PXSC1 14 mi47 min 63°F
AAMC1 - 9414750 - Alameda, CA 15 mi47 min SSW 5.1 G 6 63°F 69°F1013.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi47 min SW 13 G 14
OBXC1 16 mi47 min 63°F 62°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi47 min SW 5.1 G 7 63°F 1013.4 hPa
LNDC1 17 mi47 min SW 4.1 G 5.1 63°F 1013.5 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi47 min WNW 7 G 8.9 66°F 74°F1014.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi36 min Calm 64°F 1013 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi37 min NW 16 G 19 59°F1014.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi47 min S 15 G 18 63°F 1013.6 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi47 min SE 9.9 G 13 63°F 65°F1012.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi27 min NW 9.7 G 14 61°F 4 ft1015.4 hPa60°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi47 min SSW 9.9 G 13 69°F 1011.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi47 min SSW 5.1 G 7 71°F 69°F1012.2 hPa
UPBC1 35 mi47 min WSW 8 G 9.9
PCOC1 - 9415144 - Port Chicago, CA 39 mi47 min SSW 6 G 11 67°F 70°F1011.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi47 min W 5.1 G 9.9 73°F 1011.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi92 min W 9.9

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, CA8 mi21 minWNW 1110.00 miA Few Clouds62°F55°F80%1013.7 hPa
Half Moon Bay Airport, CA8 mi22 minWNW 47.00 miMostly Cloudy59°F57°F94%1014.9 hPa
San Carlos Airport, CA15 mi30 minW 510.00 miClear64°F55°F73%1014.2 hPa
Oakland, Metro Oakland International Airport, CA16 mi24 minW 610.00 miPartly Cloudy66°F57°F73%1013.9 hPa
Hayward, Hayward Air Terminal, CA21 mi23 minW 510.00 miFair66°F57°F73%1014.9 hPa
Palo Alto Airport, CA23 mi2.5 hrsNW 1410.00 miA Few Clouds68°F53°F60%1013.2 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrNW6CalmCalmS3CalmE4E5E3E3NE3E4SE5CalmW3S4S7S6W8NW8NW5NW7NW8--NW7
1 day agoCalmCalmCalmCalmE4CalmCalmE3CalmCalmSE4--S4SE5SE6S6S6SW4NW5--NW10NW8NW5N4
2 days agoCalmN4N4N5NW8NW9NW6CalmCalmN5NW6N7NW8NW6NW10NW15NW15
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Tide / Current Tables for Point San Bruno, San Francisco Bay, California
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Point San Bruno
Click for Map
Tue -- 05:17 AM PDT     5.81 feet High Tide
Tue -- 06:57 AM PDT     Sunrise
Tue -- 10:47 AM PDT     2.51 feet Low Tide
Tue -- 01:06 PM PDT     Moonrise
Tue -- 04:39 PM PDT     7.23 feet High Tide
Tue -- 07:05 PM PDT     Sunset
Tue -- 11:00 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.62.94.25.35.85.75.14.23.32.72.533.95.16.277.26.75.64.12.61.20.4

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Tue -- 02:07 AM PDT     1.09 knots Max Flood
Tue -- 05:37 AM PDT     -0.00 knots Slack
Tue -- 06:57 AM PDT     Sunrise
Tue -- 08:12 AM PDT     -0.77 knots Max Ebb
Tue -- 10:58 AM PDT     0.00 knots Slack
Tue -- 01:06 PM PDT     Moonrise
Tue -- 02:00 PM PDT     0.77 knots Max Flood
Tue -- 04:56 PM PDT     -0.00 knots Slack
Tue -- 07:05 PM PDT     Sunset
Tue -- 08:31 PM PDT     -1.35 knots Max Ebb
Tue -- 11:00 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.91.110.70.3-0.2-0.6-0.8-0.7-0.400.40.70.80.70.4-0-0.5-1-1.3-1.3-1-0.6

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 San Francisco Bay Area, CA
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