Friday, September18, 2020
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Marine Weather and Tides
Santa Clara, 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 6:51AMSunset 7:11PM Friday September 18, 2020 9:48 AM PDT (16:48 UTC) Moonrise 7:13AMMoonset 7:24PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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- 830 Am Pdt Fri Sep 18 2020
Today..W winds 5 to 10 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 5 to 15 kt.
Sat..W winds 5 to 15 kt.
Sat night..W winds 5 to 15 kt.
Sun..NW winds 5 to 15 kt.
Sun night..W winds up to 10 kt.
Mon..W winds 10 to 20 kt.
Tue..W winds 10 to 20 kt.
PZZ500 830 Am Pdt Fri Sep 18 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwest winds with locally stronger northwest winds south of pigeon point, into the northern Monterey bay, and south of point sur along the big sur coast. Winds are forecast to increase Saturday. Mixed seas prevail with a shorter period northwest swell and a moderate period south to southwest swell.


7 Day Forecast for Marine Location Near Santa Clara, CA
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location: 37.38, -121.9     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 181627 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 927 AM PDT Fri Sep 18 2020

SYNOPSIS. A weak front will clip the North Bay today while mid- level moisture streams across Monterey and San Benito Counties. Otherwise, a cool down today and tomorrow followed by near normal temperatures, especially in the interior, this weekend. Another slight cooldown expected primarily across the interior during the early part of next week before temps rebound again.

DISCUSSION. as of 09:25 AM PDT Friday . The forecast is still on track for this afternoon. Some areas saw drizzle and patches of moderate fog to start the day. Cloud cover from the remnants of Karina is still pushing into areas as far north as Alameda Co and is being met with more stratiform clouds associated with a low pressure moving into the Pacific Northwest.

PREV DISCUSSION. As of 3:05 AM PDT Thursday . WNW winds are being measured at higher-terrain stations in the North and East Bays and the SF Peninsula as the cold front associated with the 564dm 500hPa trough off the PAC NW coast continues to slowly inch its way towards the Oregon shoreline. Moisture associated with the trough has evolved into convection and rain over Oregon and Washington State while moisture returns further down in extreme NorCal have been minimal, at best. Back here in the CWA, the moisture that has been moving over the Central Coast for most of the day is associated with the remnants of tropical storm Karina. While there were some minor concerns for overnight high-based convection with dry lightning (which was a fair concern if we recall the aftermath of the remnants from Genevieve last month), the bulk of the moisture looks to be moved out of the Central Coast by the cold frontal passage by mid-morning. GOES-17 has picked up the lightning strikes over the PAC NW tonight but for us, only seeing a continuation of the moisture transport from Karina in the form of a long stretch of alto-cu and the possibility for some patchy drizzle along our coastal locations through the morning. Nevertheless, will continue to monitor the moisture plume through the rest of the morning.

HRRR-07Z 850hPA winds and temperature capture the wind shift and the frontal passage already being observed in higher-terrain locations. As the surface front clips the entire CWA this morning, some uncertainty exists over how quickly coastal clearing occurs. Fort Ord Profiler has observed an uptick in the marine layer depth within the last couple of hours. That being said, the early-to-mid morning marine layer inversion will likely not be very strong given the cold frontal passage. Could see coastal clearing by mid-to-late morning as a result in a north- south fashion. The possibility for the coastal clearing to occur closer to noon is still on the table, however, given surface low- level mixing may be delayed due to weak winds within the lower atmosphere.

Looking into Friday afternoon and the rest of this upcoming weekend, cold frontal passage will substantially cool down the interior, which for the last couple of days has benefited from greater diurnal heating as smoke has cleared out over much of the CWA since this past Wednesday. Cool down will run through Saturday as the axis of the upper-level trough comes ashore and moves east towards the Canadian Prairies/Montana. As it exits the West Coast, a subtle ridge axis will settle around 125W and allow for a gradual rebound in interior max temps on Sunday. Some locations, like Livermore and San Jose, may observe max temps that are as much as 8 degrees F warmer than Friday.

In terms of air quality for this upcoming weekend, conditions may potentially deteriorate in the North Bay as HRRRx vertically integrated smoke product picks up on the smoke canopy from the August Complex being advected to Napa and Sonoma Counties following the cold frontal passage and the subsequent introduction of more northerly flow.

Model guidance brings a shortwave trough into the PAC NW next Monday around the same location where our upper-level trough is currently located. Interior locations in our CWA will subsequently experience a gradual cooldown through next Wednesday, removing diurnal gains from the weekend. Nevertheless, following this shortwave, high ensemble member confidence in upper-level ridging to return to the West Coast. Not expecting significant building but should see temps return to seasonal average through the second half of next week.

The last couple of GFS and CMC ensemble runs (including the latest 00Z 9/18 runs) have hinted at the possibility of a possible offshore wind event through the end of next week, with the signature being the most pronounced on the GFS members. Nevertheless, these runs are well over 200 hours out for respective ensembles and have little certainty at this time. For now, this is far enough out that it shouldn't raise of too many eyebrows, but should keep an eye on it in the coming days.

AVIATION. As of 05:05 AM PDT Friday . for 12Z TAFS. Dirty setup making for atypical day with approaching trough from the northwest and remnant tropical moisture from Karina streaming in from the southwest. Expect fairly low IFR to MVFR cigs through this morning as frontal boundary pushes through with high clouds streaming in overhead throughout the day. Generally a boundary like this would mix out the marine layer the following night but thinking the cool air advection aloft will be too weak to do so, thus expecting a return of marine IFR-MVFR layer cigs for tonight. Winds will be stronger than yesterday with locally breezy 12-18kt with local gusts to the 20-25kt range today, though much weaker winds will likely prevail away from the usual windy spots. Some lingering smoke again today.

Vicinity of KSFO . MVFR cigs thru 18Z, then lingering SCT-FEW at 1500-2000 ft midday with passing high clouds. West winds will increase by late morning and strengthen further into the afternoon to around 15k gust 20kt. Borderline IFR-MVFR cigs tonight by 5-8Z SAT.

SFO Bridge Approach . Similar to SFO, but with smoke and haze aloft, slant range visibility may be reduced on approach.

Monterey Bay Terminals . High clouds from Karina over the region obscuring view of low level however marine layer appears mixed out with only lingering FEW-SCT at 1000 feet or so. Redevelopment of some low clouds are possible as frontal boundary passes so left TEMPO borderline IFR-MVFR through mid morning. Locally breezy this afternoon. Marine layer returns tonight.

MARINE. as of 08:57 AM PDT Friday . Light northwest winds with locally stronger northwest winds south of Pigeon Point, into the northern Monterey Bay, and south of Point Sur along the Big Sur coast. Winds are forecast to increase Saturday. Mixed seas prevail with a shorter period northwest swell and a moderate period south to southwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay from 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: BFG/BKM/Diaz/AS AVIATION: DRP MARINE: DK

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 19 mi49 min E 1.9 G 2.9 66°F 73°F1016.6 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 34 mi49 min WSW 2.9 G 4.1 64°F 67°F1016.3 hPa (+0.6)
LNDC1 35 mi49 min S 1 G 2.9 65°F 1016 hPa (+0.5)
OBXC1 37 mi49 min 63°F 63°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi49 min W 5.1 G 6
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi49 min W 5.1 G 6 63°F 1016.2 hPa (+0.7)
PXSC1 39 mi49 min 64°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi49 min WNW 2.9 G 8 64°F 1015.2 hPa (+0.7)
ELXC1 - Elkhorn Slough Reserve, CA 40 mi64 min NNW 1.9 62°F 62°F
MLSC1 - Moss Landing, South Harbor, CA 40 mi81 min NNW 1.9 G 6 60°F 1011.1 hPa58°F
FTPC1 - 9414290 - San Francisco, CA 42 mi49 min WSW 4.1 G 6 60°F 64°F1016.5 hPa (+0.9)
46092 - MBM1 44 mi40 min W 1.9 58°F 58°F1016.2 hPa (+1.7)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi49 min SW 6 G 8 63°F 1016.5 hPa (+0.8)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi38 min SSE 4.1 64°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi49 min S 4.1 G 5.1 64°F 64°F1015.9 hPa (+0.7)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 46 mi49 min WNW 8.9 G 13 67°F 1015.3 hPa (+0.6)
UPBC1 47 mi49 min W 8.9 G 11
PCOC1 - 9415144 - Port Chicago, CA 47 mi49 min WSW 5.1 G 8 65°F 68°F1015.4 hPa (+0.6)
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi49 min W 8 G 9.9 66°F 68°F1015.8 hPa (+0.7)
46237 - San Francisco Bar, CA (142) 48 mi49 min 61°F3 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi29 min NW 9.7 G 12 60°F 57°F1016.3 hPa59°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA2 mi56 minN 310.00 miMostly Cloudy66°F57°F75%1015.8 hPa
San Jose / Reid / Hillv, CA5 mi62 minWNW 510.00 miMostly Cloudy66°F60°F83%1016.3 hPa
Mountain View, Moffett Field, CA9 mi2.9 hrsN 010.00 miOvercast64°F59°F83%1015.9 hPa
Palo Alto Airport, CA14 mi62 minN 010.00 miPartly Cloudy64°F57°F78%1016.3 hPa
San Carlos Airport, CA21 mi62 minN 010.00 miMostly Cloudy64°F59°F83%1016.3 hPa
Hayward, Hayward Air Terminal, CA23 mi55 minN 010.00 miFair69°F57°F68%1016.7 hPa
Livermore, Livermore Municipal Airport, CA23 mi56 minWNW 510.00 miA Few Clouds65°F57°F76%1015.6 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrCalmN3NW5N10N12NW14NW10
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1 day agoCalm33NW5N6N12NW10NW11NW12NW12N7NW8N5CalmCalmNW3N4CalmE4E3CalmCalmSW4Calm
2 days agoCalmNW33NW64NW5NW8NW10NW10NW10NW10NW7NW6NW7N5CalmNE3N3CalmCalmSW3S3CalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Fri -- 01:34 AM PDT     10.46 feet High Tide
Fri -- 06:52 AM PDT     Sunrise
Fri -- 08:13 AM PDT     Moonrise
Fri -- 08:56 AM PDT     0.08 feet Low Tide
Fri -- 02:18 PM PDT     10.02 feet High Tide
Fri -- 07:10 PM PDT     Sunset
Fri -- 08:23 PM PDT     Moonset
Fri -- 09:20 PM PDT     0.62 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.310.110.49.685.93.61.70.50.11.13.36.18.59.99.88.874.92.91.40.712.9

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Fri -- 02:03 AM PDT     -0.00 knots Slack
Fri -- 06:26 AM PDT     -1.47 knots Max Ebb
Fri -- 06:53 AM PDT     Sunrise
Fri -- 08:13 AM PDT     Moonrise
Fri -- 08:48 AM PDT     0.00 knots Slack
Fri -- 11:26 AM PDT     1.67 knots Max Flood
Fri -- 02:34 PM PDT     -0.00 knots Slack
Fri -- 06:50 PM PDT     -1.38 knots Max Ebb
Fri -- 07:10 PM PDT     Sunset
Fri -- 08:24 PM PDT     Moonset
Fri -- 09:07 PM PDT     0.01 knots Slack
Fri -- 11:47 PM PDT     1.67 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.90-0.5-0.9-1.3-1.4-1.3-0.70.21.11.61.61.20.5-0.2-0.7-1.1-1.3-1.4-0.9-0.10.81.5

Weather Map
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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

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Ground Weather Radar Station San Francisco Bay Area, CA
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