Friday, September17, 2021
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Marine Weather and Tides
North Fair Oaks, 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 6:51AMSunset 7:14PM Friday September 17, 2021 1:10 AM PDT (08:10 UTC) Moonrise 4:57PMMoonset 2:07AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 851 Pm Pdt Thu Sep 16 2021
Tonight..NW winds 10 to 15 kt, becoming N around 5 kt after midnight.
Fri..NW winds 10 to 15 kt with gusts up to 25 kt.
Fri night..W winds 10 to 15 kt with gusts up to 25 kt.
Sat..NW winds 10 to 15 kt.
Sat night..SW winds 5 to 10 kt. A chance of showers.
Sun..W winds 5 to 10 kt. A chance of showers.
Sun night..W winds 10 to 15 kt.
Mon..W winds 10 to 15 kt.
Tue..W winds 5 to 10 kt.
PZZ500 851 Pm Pdt Thu Sep 16 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds mainly light near the coast and breezier across the outer waters, strongest over the northern outer waters. Winds will generate steep wind waves which may be hazardous for smaller vessels. Chances for showers increase over the weekend as a cold front approaches northern california. Winds will shift to the south southwest Saturday as the front approaches then shift to northwest behind the front. Wind driven seas prevail at a period of about 9 seconds with a weak, long period southerly swell through the forecast period.


7 Day Forecast for Marine Location Near North Fair Oaks, CA
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location: 37.47, -122.18     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 170555 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1055 PM PDT Thu Sep 16 2021

SYNOPSIS. A weaker dry cold front will allow for a deepening marine layer and cooler temperatures to end the week. A deeper, wetter trough arrives this weekend and bring cooler temperatures, breezy onshore winds, and a chance of rain for some. A potential offshore wind event will develop Sunday night into Tuesday.

DISCUSSION. as of 09:25 PM PDT Thursday . Temperatures this afternoon ranged from the upper 50s to lower 60s at the coast to widespread 70s inland. A few of the region's warmest spots did make it into the 80s, yet much of the interior was 8 to 14 deg F below seasonal averages this afternoon. The culprit was continued onshore flow, deep marine layer and weak short-wave trough pushing inland. As such, low clouds are rapidly spreading inland this evening with widespread coverage likely overnight and into Friday morning. That said, the ongoing forecast in the short-term remains on track with no updates needed at this time. Please see the previous discussion below for complete details on the early season storm system forecast to bring rainfall to northern California this weekend.

PREV DISCUSSION. as of 01:00 PM PDT Thursday . The marine layer has deepened steadily through this morning, from 2000 feet at sunrise, to nearly 2400 feet as of noon. This deepening is occurring as the broader pressure is on the decline on the eve of the arrival of a shortwave trough embedded in the deeper polar low. Surface pressure readings are roughly down 1.8 to 2.4mb versus 24 hours ago, while temperatures are lower and humidity is up slightly. Latest satellite imagery shows the marine layer remaining banked up along the immediate coastline from south of Cape Mendocino through Baja California, and remaining across a healthy portion of the coastal/bayside valleys. Overcast to mostly cloudy skies are being reported at Santa Rosa, Napa, Petaluma, Half Moon Bay, Oakland, San Francisco, and Watsonville within the last over due to this deepening marine layer. Despite the layer deepening, the edges of the marine layer will eventually mix out and fade away and bring some afternoon clearing to communities farther from the source origin along the coasts. Otherwise, satellite imagery shows the cooler, drier air lingering beyond the dry cold front to the northwest that will through the region over the remainder of the day/tonight. This will consequently bring cooler conditions to the region, with the biggest swing across the interior of 3-6 degrees, with only 1-2 degrees of cooling along the coast versus yesterday.

For tonight, the marine layer is anticipated to deepen further (2500-2800+ feet) and make a deeper intrusion inland as the cool air advection aloft should be weak enough to still allow for some capping.

Tomorrow will see this initial, weaker shortwave lift and the flow flatten temporarily through Friday before a deeper, wetter wave embedded in the polar low arrives later into this weekend. Thus, tomorrow will be marginally warmer and drier than today after the morning clouds mix out, though temperatures Friday will still be 3 to 12 degrees below normal.

A bigger change in the weather pattern arrives with a second deeper wave along a vigorous upper level jet over the Aleutian Islands late Saturday into Sunday. Ensemble data suggests highest probability of seeing rain will be across the North Bay, with 0.10-0.20" possible in the valleys, and up to 0.30" possible along the wetter coastal ranges. Precipitation amounts less than a .10" are expected south of the Golden Gate, with roughly a few to several hundredths for the Peninsula and East Bay bayshore. For areas in the eastern interior and South Bay, the wetter scenarios favor a few hundredths, while the drier (majority, higher probability) favor staying dry or just seeing a trace. Saturday night into Sunday is the current timeframe for the arrival of most of this precipitation, from northwest to southeast, though that could still fluctuate by about 6-12 hours until models come into full alignment. Breezy southwest winds will accompany the arrival of the cold front, on the order of 10-20 mph sustained, with localized gusts in favored areas up to 35mph. Otherwise, both Saturday and Sunday will remain on the cooler side, with widespread temperatures in the mid 60s to upper 70s across the region.

By Sunday night into Monday morning (and again Monday night into Tuesday morning), a steepening northerly low level/surface pressure gradient will enable offshore flow through the Sacramento Valley/into the eastern periphery of the North/East Bay interior ranges. We are still 24 hours too soon to really dial in the wind speeds per the higher resolution models, but for now, starting to look as if sustained N/NE winds at the higher peaks of 10-20mph with gusts 25-40mph may be possible. The strongest winds would occur between 3am and 10am Monday morning. Overnight humidity recoveries are slated to be fair given the recent addition of moisture in the area, ie as low as 35-40%, but will drop down to the mid teens during the day on Monday at the higher interior peaks. Model trend on these winds has come down slightly from earlier in the week, but still warrant close watch in the event that critical fire weather conditions present themselves. For now, these are borderline conditions, and should may eventually necessitate the issue of a fire weather watch. Again, fire weather fuels remain extremely dry, and still record dry in some interior locations. A wetting rain (in excess of >.10") could at least temporarily abate some concerns for the upcoming offshore wind event. The areas in question are right along the boundary of hitting these thresholds, so again, another interesting item to watch over the coming days as we get better data/the event unfolds.

Beyond the immediate concerns above, a trend towards warmer conditions should be expected into midweek as high pressure builds. Ensemble data comes out of phase by mid to late next week.

AVIATION. as of 10:55 PM PDT Thursday . For the 06z TAFs. A 2,000 ft marine layer remains in place per profiler data. Satellite imagery shows stratus has moved into the Bay Area and settled in down the inland valleys. MVFR/IFR conditions to prevail through mid to late Friday morning. VFR conditions returning late Friday morning to early Friday afternoon. Diminishing winds overnight with the typical sea breeze in the afternoon.

Vicinity of KSFO . VFR currently though satellite shows low clouds creeping northwards towards the terminal. MVFR cigs expected overnight and through mid to late Friday morning. VFR conditions return through the afternoon and evening. Diminishing winds overnight increasing in the afternoon around 15 kt.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . MVFR conditions currently before cigs are expected to lower to IFR tonight. IFR/MVFR conditions persisting through late Friday morning and potentially into the early afternoon. Brief VFR conditions Friday afternoon before low clouds return by the early evening.

MARINE. as of 09:25 PM PDT Thursday . Northwest winds mainly light near the coast and breezier across the outer waters, strongest over the northern outer waters. Winds will generate steep wind waves which may be hazardous for smaller vessels. Chances for showers increase over the weekend as a cold front approaches Northern California. Winds will shift to the south southwest Saturday as the front approaches then shift to northwest behind the front. Wind driven seas prevail at a period of about 9 seconds with a weak, long period southerly swell through the forecast period.

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



PUBLIC FORECAST: RGass/DRP AVIATION: AS MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 3 mi53 min NW 6 G 7 59°F 1013.1 hPa
AAMC1 - 9414750 - Alameda, CA 22 mi53 min WSW 11 G 12 56°F 67°F1013 hPa
LNDC1 23 mi53 min W 6 G 9.9 57°F 1012.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi53 min WSW 12 G 14
PXOC1 - 9414311 - San Francisco (Pier 1), CA 25 mi53 min W 4.1 G 7 55°F 1011.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi53 min W 5.1 G 8.9 56°F 1012.6 hPa
OBXC1 25 mi53 min 56°F
PXSC1 26 mi53 min 56°F
FTPC1 - 9414290 - San Francisco, CA 28 mi53 min SW 5.1 G 8.9 55°F 64°F1012.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 32 mi53 min SW 15 G 19 56°F 1012.5 hPa
46237 - San Francisco Bar, CA (142) 33 mi41 min 56°F 59°F5 ft
RCMC1 - 9414863 - Richmond, CA 34 mi59 min SSW 5.1 G 8.9 57°F 65°F1012.5 hPa
46269 38 mi41 min 57°F 61°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 38 mi31 min NW 7.8 G 12 56°F 1013.5 hPa52°F
MZXC1 - 9415102 - Martinez-Amorco CA 39 mi53 min WSW 11 G 13 57°F 68°F1011.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 40 mi31 min WNW 7.8 G 12 59°F1013.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi53 min WSW 11 G 15 57°F 1011.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 41 mi53 min WSW 16 G 20 57°F 69°F1011.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi53 min WNW 16 G 21 59°F 1010.2 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi31 min NW 3.9 G 7.8 57°F 61°F1013.3 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA3 mi4.4 hrsNNW 710.00 miClear61°F54°F77%1011.5 hPa
San Carlos Airport, CA6 mi16 minN 010.00 miOvercast59°F54°F82%1012.5 hPa
Hayward, Hayward Air Terminal, CA14 mi17 minW 510.00 miOvercast59°F53°F81%1013.1 hPa
San Francisco, San Francisco International Airport, CA14 mi15 minW 910.00 miPartly Cloudy57°F51°F81%1012.2 hPa
San Jose, San Jose International Airport, CA15 mi18 minSSE 710.00 miMostly Cloudy58°F51°F78%1012.2 hPa
Oakland, Metro Oakland International Airport, CA16 mi18 minW 910.00 miOvercast59°F52°F78%1012.6 hPa
Half Moon Bay Airport, CA17 mi16 minSW 56.00 miFog/Mist55°F52°F88%1013.2 hPa
San Jose / Reid / Hillv, CA21 mi3.2 hrsVar 410.00 miClear61°F52°F72%1011.8 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hr------------------SE6SE7SE56E6----N11NW13N12NW12--NW10--NW7
1 day ago------------------CalmCalmNE4--N46--N10NW12N13N13N12N13N12NW10
2 days ago------------------3CalmCalm4N4N7N8N10NW11--N11--N12N12N9

Tide / Current Tables for Redwood City, Wharf 5, California (3)
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Redwood City
Click for Map
Fri -- 03:07 AM PDT     Moonset
Fri -- 05:03 AM PDT     -0.22 feet Low Tide
Fri -- 06:52 AM PDT     Sunrise
Fri -- 11:41 AM PDT     7.39 feet High Tide
Fri -- 05:10 PM PDT     2.62 feet Low Tide
Fri -- 05:57 PM PDT     Moonrise
Fri -- 07:12 PM PDT     Sunset
Fri -- 10:38 PM PDT     8.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.44.62.81.20.1-0.20.11.22.74.56.17.27.36.75.54.23.12.62.945.578.18.3

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Fri -- 02:05 AM PDT     -1.50 knots Max Ebb
Fri -- 03:07 AM PDT     Moonset
Fri -- 05:31 AM PDT     0.00 knots Slack
Fri -- 06:52 AM PDT     Sunrise
Fri -- 09:07 AM PDT     1.75 knots Max Flood
Fri -- 12:45 PM PDT     -0.00 knots Slack
Fri -- 03:08 PM PDT     -0.66 knots Max Ebb
Fri -- 05:29 PM PDT     0.00 knots Slack
Fri -- 05:56 PM PDT     Moonrise
Fri -- 07:12 PM PDT     Sunset
Fri -- 08:43 PM PDT     1.36 knots Max Flood
Fri -- 11:55 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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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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