Portola Valley, CA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Portola Valley, CA


December 10, 2023 6:36 PM PST (02:36 UTC)
Sunrise 7:10AM   Sunset 4:52PM   Moonrise  4:54AM   Moonset 3:03PM 

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. Privacy and Cookie policy

Marine Forecasts
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PZZ531 San Francisco Bay South Of The Bay Bridge- 131 Pm Pst Sun Dec 10 2023
Today..E winds around 5 knots...becoming nw this afternoon.
Tonight..N winds 5 to 10 knots.
Mon..NW winds 5 to 10 knots.
Mon night..W winds 5 to 10 knots. Patchy fog.
Tue..N winds 5 to 10 knots. Patchy fog.
Tue night..NW winds 5 to 10 knots.
Wed..NE winds 5 to 10 knots.
Thu..NE winds around 5 knots.

PZZ500 131 Pm Pst Sun Dec 10 2023
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries...
the quiet weather over the waters continue to be under a high pressure system. Gusty wind continue to build in the southern waters as well as south of point sur creating hazardous conditions for small craft vessels with winds diminishing near the mid-week. Slight chance for a shower or two tonight into Tuesday in the outer waters as a weak weather disturbance passes by.


7 Day Forecast for Marine Location Near Portola Valley, CA
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Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 102358 AFDMTR

Area Forecast Discussion National Weather Service San Francisco CA 358 PM PST Sun Dec 10 2023

New AVIATION, MARINE

SYNOPSIS
Issued at 1140 PM PST Sat Dec 9 2023

Quiet weather this week with mild days and cool nights. A pattern change takes hold for next weekend into early next week with a likely return to wet and unsettled conditions.

SHORT TERM
(This evening through Monday)
Issued at 125 PM PST Sun Dec 10 2023

Filtered sunshine across the Bay Area and Central Coast this afternoon. A pleasant afternoon with temps in the upper 50s to lows 70s.

After several nights of cold weather prompting Frost/Freeze headlines temperatures tonight will be warmer thanks to the cloud cover and approaching surface front from the NW. That being said, interior locations will still be chilly and in the mid to upper 30s.

A weak cold front off the OR coast will continue to track southward over the next 24 hour. This front will be weakening and ultimately wash out over the Bay Area and coastal waters. As this happens a few showers will be possible over the coastal waters Monday with some patchy drizzle along the immediate coast. While land areas look mostly dry, the front will bring some clouds and cooler conditions on Monday.

LONG TERM
(Monday night through next Saturday)
Issued at 133 PM PST Sun Dec 10 2023

For the upcoming work week - looks relatively quiet with mild and dry conditions. An upper level shortwave trough deepens into an upper low over NV and AZ Monday night through Tuesday. This low will result in a period of offshore flow midweek. Winds will be locally breezy over the North and East Bay Mts. The offshore flow will keep mild and dry conditions in place. As the low moves farther east midweek high pressure builds over CA. This building ridge will keep the warming trend in place. In fact, by Thursday and Friday well above normal temperatures will develop around the region. ECMWF Extreme Forecast Index gives confidence in this occurring and also highlights that it's unusual for this time of year. Highs will generally be in the 60s to mid 70s Thu/Fri. San Jose will be near record values for Friday.

A notable pattern shift in the weather is still expected next weekend. As noted before, both deterministic and ensemble guidance continue to advertise a robust jet moving across the Pacific. This upper level jet will bring a more active period to the West Coast, including CA this time. Current forecast brings rain back tot he region as early as Saturday. Additionally, latest Atmospheric River guidance gives about a 40-60% chance for an AR to reach CA late next weekend into the following. Exact details like: timing, amounts, intensity, will be fine tuned over the upcoming week.

AVIATION
(00Z TAFS)
Issued at 357 PM PST Sun Dec 10 2023

Currently seeing VFR at all terminals. Most terminals will retain this status throughout the TAF period; however, OAK and STS may not.
There is some hinting by hi-res models that OAK may obtain an MVFR or even potentially an IFR ceiling towards the end of the TAF period; however, confidence was not high enough to include such in the TAF. There is more hinting for STS to see something similar to what they saw last night in terms of low fog and low visibility; however, the passage of high clouds from a shortwave may hinder that opportunity, thus not giving high enough confidence to include in the TAF.

Vicinity of SFO... Currently VFR with calm winds and high clouds.
VFR will persist throughout the TAF period. Winds will remain breezy and onshore throughout the TAF period with northwesterly winds giving way to westerly winds by 22Z tomorrow afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently VFR at both MRY and SNS, this will be the case throughout the TAF period. Winds will turn offshore and remain light overnight before returning to breezy onshore flow tomorrow.

MARINE
(Tonight through next Friday)
Issued at 357 PM PST Sun Dec 10 2023

The quiet weather over the waters continue to be under a high pressure system. Gusty wind continue to build in the southern waters as well as south of Point Sur creating hazardous conditions for small craft vessels with winds diminishing near the mid-week.
Slight chance for a shower or two tonight into Tuesday in the outer waters as a weak weather disturbance passes by.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory from 9 PM this evening to 3 AM PST Tuesday for Pt Pinos to Pt Piedras Blancas 0-10 nm.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
RTYC1 - 9414523 - Redwood City, CA 10 mi48 min NNW 7G8 56°F30.20
AAMC1 - 9414750 - Alameda, CA 29 mi48 min N 1.9G4.1 56°F30.21
LNDC1 30 mi48 min ENE 1G2.9 30.21
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi48 min NNW 4.1G5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi48 min WSW 4.1G7 30.18
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi48 min NNE 2.9G5.1 30.21
PXSC1 32 mi168 min 56°F
FTPC1 - 9414290 - San Francisco, CA 33 mi48 min NNW 8G9.9 58°F30.20
1801589 35 mi126 min NNW 12G14 57°F 57°F4 ft30.2147°F
46237 - San Francisco Bar, CA (142) 37 mi66 min 55°F 56°F4 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi48 min N 6G8 30.22
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi112 min WNW 4.1 53°F 30.1842°F
RCMC1 - 9414863 - Richmond, CA 40 mi48 min NNE 4.1G7 56°F30.20
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi36 min NNW 14G18 56°F30.23
46276 42 mi66 min 57°F2 ft
46279 42 mi100 min 56°F 57°F2 ft
46092 - MBM1 43 mi79 min WNW 5.8 58°F 59°F30.18
MLSC1 - Moss Landing, South Harbor, CA 45 mi36 min 57°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi111 min ENE 1 61°F 30.1539°F
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi48 min 0G1 55°F30.21
UPBC1 47 mi48 min E 4.1G5.1
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi48 min ESE 2.9G2.9 30.20
CQUC1 49 mi65 min 54°F
PCOC1 - 9415144 - Port Chicago, CA 49 mi48 min E 1.9G2.9 54°F30.20

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Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KPAO PALO ALTO,CA 9 sm49 minNW 0410 smPartly Cloudy48°F45°F87%30.20
KNUQ MOFFETT FEDERAL AFLD,CA 10 sm21 mincalm10 smClear52°F45°F76%30.20
KSQL SAN CARLOS,CA 10 sm1.8 hrscalm10 smPartly Cloudy55°F45°F67%30.21
KSJC NORMAN Y MINETA SAN JOSE INTL,CA 16 sm43 mincalm10 smMostly Cloudy55°F43°F62%30.19
KHAF HALF MOON BAY,CA 18 sm21 mincalm10 smClear50°F43°F76%30.18
KSFO SAN FRANCISCO INTL,CA 20 sm40 minN 0710 smMostly Cloudy55°F43°F62%30.20
KHWD HAYWARD EXECUTIVE,CA 22 sm42 minENE 0310 smClear54°F43°F67%30.20
KRHV REIDHILLVIEW OF SANTA CLARA COUNTY,CA 22 sm1.8 hrscalm10 smPartly Cloudy55°F39°F54%30.20

Wind History from PAO
(wind in knots)


Tide / Current for Palo Alto Yacht Harbor, California
   
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Palo Alto Yacht Harbor
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Sun -- 04:53 AM PST     Moonrise
Sun -- 05:03 AM PST     2.93 feet Low Tide
Sun -- 07:11 AM PST     Sunrise
Sun -- 10:22 AM PST     8.77 feet High Tide
Sun -- 03:02 PM PST     Moonset
Sun -- 04:50 PM PST     Sunset
Sun -- 05:48 PM PST     -0.27 feet Low Tide
Sun -- 11:39 PM PST     6.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Palo Alto Yacht Harbor, California, Tide feet
12
am
5.9
1
am
5.3
2
am
4.6
3
am
3.9
4
am
3.3
5
am
2.9
6
am
3.3
7
am
4.5
8
am
6.2
9
am
7.8
10
am
8.7
11
am
8.6
12
pm
7.5
1
pm
6
2
pm
4.3
3
pm
2.6
4
pm
1.1
5
pm
0
6
pm
-0.3
7
pm
0.4
8
pm
2
9
pm
3.9
10
pm
5.5
11
pm
6.3



Tide / Current for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
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Sun -- 02:02 AM PST     -0.61 knots Max Ebb
Sun -- 04:44 AM PST     0.00 knots Slack
Sun -- 04:53 AM PST     Moonrise
Sun -- 07:12 AM PST     Sunrise
Sun -- 07:51 AM PST     1.24 knots Max Flood
Sun -- 10:31 AM PST     -0.00 knots Slack
Sun -- 02:19 PM PST     -1.35 knots Max Ebb
Sun -- 03:02 PM PST     Moonset
Sun -- 04:50 PM PST     Sunset
Sun -- 05:51 PM PST     0.00 knots Slack
Sun -- 09:03 PM PST     1.66 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Dumbarton Hwy Bridge, South San Francisco Bay, California Current, knots
12
am
-0.2
1
am
-0.5
2
am
-0.6
3
am
-0.5
4
am
-0.2
5
am
0.1
6
am
0.7
7
am
1.1
8
am
1.2
9
am
1
10
am
0.4
11
am
-0.2
12
pm
-0.7
1
pm
-1.1
2
pm
-1.3
3
pm
-1.3
4
pm
-1
5
pm
-0.5
6
pm
0.1
7
pm
0.9
8
pm
1.5
9
pm
1.7
10
pm
1.5
11
pm
1




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San Francisco Bay Area, CA,



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