Thursday, July16, 2020
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Marine Weather and Tides
Piedmont, CA

Version 3.4
NOTICE
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 5:58AMSunset 8:31PM Thursday July 16, 2020 10:05 AM PDT (17:05 UTC) Moonrise 1:34AMMoonset 4:07PM Illumination 14% Phase: Waning Crescent; Moon at 26 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 912 Am Pdt Thu Jul 16 2020
.small craft advisory in effect from 1 pm this afternoon to 7 pm pdt this evening...
Today..SW winds 10 to 20 kt...increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt.
Sat night..SW winds 5 to 15 kt.
Sun..SW winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 912 Am Pdt Thu Jul 16 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure offshore will continue to bring generally light to moderate southerly flow over the waters through Friday. Meanwhile, locally stronger northwest winds will develop across the northern offshore waters Thursday night into Friday. Gusty winds will once again be possible through the golden gate and west delta Thursday afternoon. Northwest swells will continue to be mixed with a small southwest swell.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 161600 CCA AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 838 AM PDT Thu Jul 16 2020

SYNOPSIS. Seasonable conditions will continue across the region the next several days, with onshore flow prevailing. The marine layer will linger along the coast as well, bringing night and morning low clouds, with sunny afternoons. Some smoke and haze from the Coyote and Mineral fires may impact portions of the Bay Area and Central coast today and potentially into Friday.

DISCUSSION. As of 08:35 AM PDT Thursday . A deep marine layer intrusion occurred overnight with stratus cloud bases ranging from 500 to 1200 feet and depths 2000 to 2500 feet. Onshore flow will persist over the course of the day which will help dislodge any near surface smoke from the vicinity of the Bay Area after afternoon sea breeze winds increase. Regional air quality sensors are fairly green across the board so far this morning though enough suspended particulate present could lead to locally hazy conditions through this morning. Today will be comparable to yesterday with slight to somewhat below normal temperatures under onshore flow. May see some accus develop in the afternoon as the first pulse of elevated monsoonal instability/moisture drifts off the Sierra Nevada from the ESE. This monsoonal drift is fairly weak with moisture/instability parameters primarily below even our low end thresholds for elevated convection but not nonzero. That said, mid July through August is typically when we see the desert southwest monsoon ramp up and occasionally impact our area with elevated convection, so it is something we will be watching closer over the coming several weeks.

PREVIOUS DISCUSSION. As of 2:40 AM PDT Thursday . Water vapor imagery shows another trough of low pressure taking aim at the Pacific Northwest this morning, with an upper level low over the Southern California Bight. As a result, general troughiness remains along the West Coast. A relatively deep marine layer, around 2500 feet deep according to the Fort Ord profiler, also remains and is pushing into the inland coastal valleys at this time. These low clouds will linger through mid morning, then give way to mostly sunny skies and seasonal temperatures. The HRRR model continues to suggest that smoke from the Coyote and Mineral Fires may impact the region today in the form of some haze. In fact, the heat signature from the Mineral Fire is suggesting it flared up a bit during the overnight hours, so some smoke and haze is definitely not out of the question for today.

The overall upper level pattern does not change much for Friday or this weekend, as the upper level low over the Bight lifts and retrogrades off the Central Coast. The models are hinting at an upper level disturbance lifting across our region as this low retrogrades off the coast on Friday. If there was more upper level moisture associated with this disturbance, the threat of elevated convection would concern me. However, all the models are suggesting minimal moisture at 700 mbs or between 700 and 500 mbs. Therefore, thinking we will most likely be see little impact, but it will be something to watch over the next 24 to 36 hours. The models are also hinting at another disturbance lifting over the region on Sunday. Again, the moisture is so limited in the upper levels, that expect little if any impact. However, it will be something to watch. The only things that these two disturbances may do are to help deepen the marine layer even more and help trigger some drizzle for the coastal areas. Right now, expect seasonal temperatures to prevail, with only minor day to day fluctuations possible.

As we head into the new work week, expect more of the same, with seasonal conditions prevailing. Night and morning low clouds will continue as well, and onshore flow prevailing. Palmer

AVIATION. as of 04:55 AM PDT Thursday . for 12Z TAFs . A deep marine layer has resulted in widespread stratus over the most regional terminals this morning with ceilings generally between 600-1200 feet. However, far interior locations such as KSJC will likely remain VFR while KLVK may see a brief period of MVFR ceilings develop around sunrise. These low clouds will begin to dissipate between 16Z-19Z and give way to VFR conditions this afternoon along with an increase in onshore winds. Look for potentially an earlier return of stratus late this evening and into Friday morning.

Vicinity of KSFO . MVFR ceilings have developed over KSFO and will likely persist through about 16Z along with northwesterly winds generally less than 10 kt. Winds will diminish slightly and low clouds will begin to dissipate before northwesterly winds once again increase by around 20Z. With the continued wildfires in San Benito and Fresno counties (south of the Bay Area), reduced visibilities will be possible in upper levels of the atmosphere upon descent. Otherwise, VFR is forecast with breezier onshore flow this afternoon and evening. Moderate confidence of stratus return early Friday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . IFR to brief LIFR ceilings this morning with generally light and variable winds. Ceilings will likely begin to lift to MVFR around 17Z before scattering out around 19Z. Onshore winds will also being to increase to between 9-12 kt beyond 19Z and continue through the afternoon. Moderate to high confidence of lowering ceilings late this evening.

MARINE. as of 04:55 AM PDT Thursday . Low pressure off of the coast will continue to bring generally light to moderate southerly flow over the waters through Friday. Meanwhile, locally stronger northwest winds will develop across the northern offshore waters Thursday night into Friday. Gusty winds will once again be possible through the Golden Gate and West Delta Thursday afternoon. The sea state will continue a moderate southerly swell with a moderate period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 1 PM



PUBLIC FORECAST: DRP AVIATION: RGass MARINE: RGass

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 7 mi65 min 69°F
RCMC1 - 9414863 - Richmond, CA 11 mi65 min 64°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi31 min SE 1.9 57°F 1014 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi65 min 62°F
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi65 min 70°F
PCOC1 - 9415144 - Port Chicago, CA 17 mi65 min 71°F
46237 - San Francisco Bar, CA (142) 22 mi35 min 57°F3 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi65 min 74°F
SFXC1 - San Francisco Bay Reserve, CA 26 mi80 min W 15
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi25 min SSE 5.8 G 7.8 55°F 55°F1013.9 hPa55°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi25 min SSE 3.9 G 7.8 56°F 1013.9 hPa55°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi72 minWNW 810.00 miOvercast63°F55°F76%1013 hPa
Concord, Buchanan Field, CA13 mi72 minW 710.00 miFair64°F53°F68%1010.9 hPa
Hayward, Hayward Air Terminal, CA14 mi71 minN 010.00 miOvercast63°F54°F73%1013.7 hPa
San Francisco, San Francisco International Airport, CA18 mi69 minNNE 410.00 miMostly Cloudy61°F53°F75%1012.9 hPa
San Carlos Airport, CA22 mi69 minVar 410.00 miOvercast63°F57°F83%1013.2 hPa
Livermore, Livermore Municipal Airport, CA24 mi72 minN 010.00 miFair64°F55°F73%1012.1 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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1 day agoS7SW5W7W8W7NW14NW15NW15NW12NW10N9N7N6N5N3N4W6W5CalmCalmSW5W3NW4W4
2 days agoW5NW5NW10NW9W12W10W11W96W10
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Tide / Current Tables for Berkeley, California
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Berkeley
Click for Map
Thu -- 02:33 AM PDT     Moonrise
Thu -- 04:01 AM PDT     0.42 feet Low Tide
Thu -- 06:00 AM PDT     Sunrise
Thu -- 11:09 AM PDT     3.98 feet High Tide
Thu -- 03:28 PM PDT     2.97 feet Low Tide
Thu -- 05:07 PM PDT     Moonset
Thu -- 08:30 PM PDT     Sunset
Thu -- 09:26 PM PDT     6.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.62.41.40.70.40.61.222.73.43.843.93.63.3333.44.14.95.66.165.5

Tide / Current Tables for Berkeley Yacht Harbor .9 mi S, San Francisco Bay, California Current
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Berkeley Yacht Harbor .9 mi S
Click for Map
Thu -- 12:33 AM PDT     -0.36 knots Max Ebb
Thu -- 02:33 AM PDT     Moonrise
Thu -- 03:48 AM PDT     0.01 knots Slack
Thu -- 06:00 AM PDT     Sunrise
Thu -- 07:54 AM PDT     0.26 knots Max Flood
Thu -- 11:18 AM PDT     -0.01 knots Slack
Thu -- 01:05 PM PDT     -0.15 knots Max Ebb
Thu -- 03:24 PM PDT     0.00 knots Slack
Thu -- 05:07 PM PDT     Moonset
Thu -- 07:13 PM PDT     0.21 knots Max Flood
Thu -- 08:30 PM PDT     Sunset
Thu -- 10:23 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-0.3-0.3-0.100.10.20.20.30.20.20-0.1-0.2-0.1-000.10.20.20.20.10-0.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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