Thursday, July29, 2021
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Marine Weather and Tides
Portola Valley, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:09AMSunset 8:20PM Thursday July 29, 2021 8:45 AM PDT (15:45 UTC) Moonrise 10:51PMMoonset 10:57AM Illumination 72% Phase: Waning Gibbous; Moon at 20 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- 306 Am Pdt Thu Jul 29 2021
Today..NW winds 10 to 20 kt.
Tonight..NW winds 5 to 10 kt.
Fri..NW winds 10 to 20 kt.
Fri night..W winds 5 to 10 kt.
Sat..SW winds 5 to 10 kt.
Sat night..W winds 5 to 10 kt.
Sun..W winds 10 to 15 kt.
Mon..W winds 10 to 15 kt.
PZZ500 306 Am Pdt Thu Jul 29 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Occasionally gusty northwest winds across the northern outer waters and gusty west winds each afternoon and evening across the san francisco bay north of the bay bridge otherwise light northwest winds through Monday. A moderate period southerly swell will persist in the waters.


7 Day Forecast for Marine Location Near Portola Valley, CA
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location: 37.36, -122.23     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 291154 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 454 AM PDT Thu Jul 29 2021

SYNOPSIS. Seasonably warm weather pattern continues inland through Friday with high pressure over the region. A shallow marine layer will persist along the coast keeping temperatures seasonably mild near the coast and bays. A modest cooling trend starts this weekend for inland areas as onshore winds strengthen and the marine layer deepens along the coast.

DISCUSSION. as of 4:51 AM PDT Thursday . USGS reported a major (magnitude 8.2) earthquake 62 miles southeast of Perryville Alaska last night. However, after reviewing subsequent data and model projections the Tsunami Warning Center has given an "all clear" for all U.S. West Coast residents. No further alerts/updates are expected. Atypical though small non-advisory fluctuations are likely along the California coastline and harbors and bays may experience unusual currents through mid to late morning.

A quiet summer-time weather pattern is ongoing, stratus and fog are filling back in along the coast and nearby coastal valleys. Mid and high level clouds are moving northward across the north Central Coast and the Bay Area; mid level instability is producing a few sprinkles /virga/ over the southern coastal waters per KMUX radar. Not much time to look over weather data and model output overnight. Current forecast looks good, no updates as of this early morning hour. May need to monitor mid level instability a bit more closely. A quick look at qpf forecasts from model output leans toward night and morning coastal drizzle over the weekend and next week.

AVIATION. as of 4:24 AM PDT Thursday . For the 12z TAFs. High clouds continue to be a factor giving and obstructed view of the low level clouds that have struggled to push inland overnight. Monterey Bay terminals continue to be at IFR as well as OAK and STS, while other TAF sites remain at VFR. Winds will stay mild for into Thursday morning but will begin to increase in the late morning. Cloud cover around the SF Bay will clear much sooner than the Monterey Bay meaning OAK and STS will return to VFR in the early to mid morning, while MRY and SNS will go VFR closer to noon. Expect a mostly clear Thursday afternoon with moderate westerly winds.

Vicinity of KSFO . VFR through the TAF period. Expect few to scattered low clouds lingering in the morning, but thinning out into the afternoon. Winds remain mild until afternoon with peak winds from the Northwest around 19 kts. These winds look to last through that evening but back off into Thursday night.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . IFR until the late morning with stratus retreating before noon, leading to VFR. Winds remain weak and variable through the morning, before becoming more moderate in the afternoon. Winds weaken and stratus returns in the late evening and early night leading to IFR around the Monterey Bay overnight.

MARINE. as of 3:12 AM PDT Thursday . Occasionally gusty northwest winds across the northern outer waters and gusty west winds each afternoon and evening across the San Francisco Bay north of the Bay Bridge otherwise light northwest winds through Monday. A moderate period southerly swell will persist in the waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 3 PM



PUBLIC FORECAST: Canepa AVIATION: Murdock MARINE: Canepa

Visit us at www.weather.gov/sanfrancisco

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi46 min ESE 1.9 G 2.9 62°F 1015.8 hPa (-0.0)
AAMC1 - 9414750 - Alameda, CA 29 mi46 min W 4.1 G 7 58°F 68°F1015.6 hPa (+0.4)
LNDC1 30 mi46 min W 4.1 G 5.1 59°F 1015.2 hPa (+0.5)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi46 min WSW 8 G 8.9
OBXC1 31 mi64 min 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi46 min W 4.1 G 7 58°F 1014.2 hPa (+0.4)
46269 31 mi46 min 56°F 60°F2 ft
PXSC1 32 mi52 min 59°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi46 min WSW 2.9 G 6 59°F 1015.3 hPa (+0.4)
FTPC1 - 9414290 - San Francisco, CA 33 mi46 min SW 5.1 G 8 56°F 62°F1015.3 hPa (+0.5)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi26 min S 3.9 G 5.8 55°F 1015.9 hPa54°F
46237 - San Francisco Bar, CA (142) 36 mi46 min 59°F3 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi46 min SSW 11 G 16 57°F 1015.5 hPa (+0.5)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi65 min Calm 57°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi46 min S 4.1 G 8 58°F 64°F1015.2 hPa (+0.5)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi26 min NW 1.9 G 3.9 56°F 59°F1016 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi26 min S 5.8 G 7.8 58°F1015.9 hPa
46092 - MBM1 43 mi83 min WSW 1.9 56°F 58°F1015.4 hPa (+0.7)
MLSC1 - Moss Landing, South Harbor, CA 45 mi29 min Calm 56°F 56°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi61 min WSW 1 57°F 1016 hPa57°F
46114 - West Monterey Bay, CA 46 mi80 min 59°F4 ft
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi46 min WNW 16 G 20 60°F 68°F1014.3 hPa (+0.5)
UPBC1 47 mi46 min NW 14 G 19
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi46 min W 8.9 G 15 59°F 1014.7 hPa (+0.7)
PCOC1 - 9415144 - Port Chicago, CA 49 mi46 min W 20 G 23 61°F 68°F1013.9 hPa (+0.7)
CQUC1 49 mi57 min 67°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA10 mi59 minVar 310.00 miOvercast63°F57°F83%1015.2 hPa
Mountain View, Moffett Field, CA11 mi56 minN 09.00 miOvercast64°F59°F83%1014.9 hPa
San Carlos Airport, CA12 mi52 minN 010.00 miOvercast63°F59°F88%1015.2 hPa
San Jose, San Jose International Airport, CA16 mi53 minSSE 310.00 miMostly Cloudy65°F57°F76%1014.7 hPa
San Francisco, San Francisco International Airport, CA19 mi50 minN 310.00 miMostly Cloudy62°F56°F80%1014.8 hPa
Hayward, Hayward Air Terminal, CA22 mi52 minN 010.00 miA Few Clouds62°F57°F84%1015.7 hPa
San Jose / Reid / Hillv, CA22 mi59 minN 010.00 miMostly Cloudy64°F55°F73%1015.2 hPa
Oakland, Metro Oakland International Airport, CA23 mi53 minN 010.00 miMostly Cloudy62°F57°F84%1015.1 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hrCalmCalmN5--N10N9N11NW13N14N17NW13N11NW6------------------33
1 day agoNW5N8N10N8NW10--NW10N14N15N16----N13------------------NW53
2 days agoN4N6N6N4N6N9N13--N15N14N12N12N10------------------CalmCalm

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
Click for Map
Thu -- 12:05 AM PDT     2.20 feet Low Tide
Thu -- 05:02 AM PDT     7.14 feet High Tide
Thu -- 06:10 AM PDT     Sunrise
Thu -- 11:56 AM PDT     Moonset
Thu -- 12:14 PM PDT     0.97 feet Low Tide
Thu -- 05:54 PM PDT     7.62 feet High Tide
Thu -- 08:18 PM PDT     Sunset
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.63.85.36.67.16.75.74.63.42.41.511.22.44.267.37.67.26.45.44.43.3

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Thu -- 02:45 AM PDT     1.16 knots Max Flood
Thu -- 05:31 AM PDT     -0.00 knots Slack
Thu -- 06:10 AM PDT     Sunrise
Thu -- 08:51 AM PDT     -0.99 knots Max Ebb
Thu -- 11:56 AM PDT     Moonset
Thu -- 12:07 PM PDT     0.00 knots Slack
Thu -- 03:17 PM PDT     1.42 knots Max Flood
Thu -- 06:22 PM PDT     -0.00 knots Slack
Thu -- 08:19 PM PDT     Sunset
Thu -- 09:29 PM PDT     -0.86 knots Max Ebb
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.61.11.10.90.4-0.2-0.6-0.9-1-0.8-0.5-0.10.61.11.41.310.3-0.3-0.6-0.8-0.8-0.6

Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
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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