Thursday, June22, 2017 L-36.com


Marine Weather and Tides
Sunnyvale, CA

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:46AMSunset 8:33PM Thursday June 22, 2017 7:17 AM PDT (14:17 UTC) Moonrise 3:41AMMoonset 6:06PM Illumination 3% Phase: Waning Crescent; Moon at 28 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 San Francisco Bay North Of The Bay Bridge- 305 Am Pdt Thu Jun 22 2017
Today..SW winds 10 kt...increasing to 10 to 20 kt in the afternoon.
Tonight..SW winds 10 to 20 kt.
Fri..SW winds 10 to 20 kt.
Fri night..SW winds 10 to 20 kt. Patchy fog after midnight.
Sat..SW winds 15 to 25 kt. Patchy fog in the morning.
Sun..SW winds 10 to 20 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 305 Am Pdt Thu Jun 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Split flow with moderate northwest winds primarily over the northern outer waters with lighter southwest winds elsewhere. Hazardous seas from steep wind waves and fresh swell can be expected over the outer waters through the day. Look for gradually improving conditions late today through the remainder of the week.

7 Day Forecast for Marine Location Near Sunnyvale, CA
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location: 37.42, -121.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221152
afdmtr
area forecast discussion
national weather service san francisco bay area
452 am pdt Thu jun 22 2017

Hot weather continues inland through this evening...

Synopsis Heat advisories and warnings are in place today
through 9 pm for dangerously hot temperatures. A shallow marine
layer along the central coast will keep the monterey bay coastal
areas much cooler. All areas start to gradually cool Friday and
through the weekend as more persistent onshore flow returns to the
region.

Discussion As of 4:06 am pdt Thursday... Northerly gradient
down the coast is still around 6 mb and helping to support some
north northeast winds across the north bay hills. A few sites in
the north bay hills are still above 90 as of 3 am with widespread
70s and 80s in the hills. There is still enough onshore flow at
the surface with 2 mb sfo to sac to allow the valleys to cool into
the 60s. Its this somewhat subtle northerly wind flow in the
hills that will set the stage for rapid warming today, especially
for the interior of the north and east bay. Essentially heat
advisories are in place near sf bay and some of the valleys with
warnings in place for the hills and far east bay where warm
overnight lows and hot days have meant little or no relief from
the heat. The warnings advisories remain in place through 9 pm. If
seeking relief the coast from santa cruz southward through
monterey county is the place to be with an 800 foot marine layer
in place. The immediate coast will remain out of any headlines.

Even though 850 mb temps dont change too much into Friday we
expect noted cooling to occur especially for the coastal and
bayside valleys. The upper flow will become so amplified and
eventually buckle with weak surface low pressure (around 1010 mb)
developing well offshore. This in combination with the excessive
heat across the central valley will induce persistent onshore flow
Friday and through the weekend as well as a deepening marine
layer. Upshot is to expect a modest cooling trend back to more
seasonable levels.

Long range trends on the latest ECMWF show the upper pattern with
a trough off the coast suggesting near to perhaps slightly below
normal temperatures for next week. No precipitation, outside of
coastal drizzle is forecast.

Aviation As of 4:50 pm pdt Thursday... The marine stratus deck
is struggling under the dry, subsiding high pressure dome set up
over the area. As a result, widespreadVFR conditions are being
reported at TAF sites. That said, marine stratus is still
obscuring the monterey bay and portion of the northern salinas
valley. For today, generally light occasionally breezy winds and
clear skies will prevail. For tonight, mostly clear skies with
some stratus primarily banked up along the monterey expected.

Vicinity of ksfo...VFR. Light winds becoming breezy by the
afternoon up to 15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR at the TAF sites with lifr to ifr
cigs due to marine stratus in the vicinity of the TAF sites. Light
winds. Low clouds will briefly return tonight but depart before
sunrise.

Fire weather As of 4:06 am pdt Thursday... The most critical
areas this morning will be the hills of the north bay, especially
napa county and around mt st helena where winds above 2000 feet
will be northeast and gusting 20-25 mph. Humidity values are
starting to drop down to 20-30% in the hills as of 3 am with hot
temperatures in the 80s and lower 90s at this early hour. Expect a
hot and dry day all inland areas and hills today. Main concern
this afternoon will be a transition to westerly winds should any
new starts occur.

Although onshore flow will return by tonight, the marine layer
will remain shallow and the airmass aloft will remain very warm
for a few more days. Thus, conditions in the hills will only
gradually improve from Friday through the weekend. Much improved
conditions are expected by early next week.

Climate
Here is a list of record high temperatures
sf bay area Thursday
location... ... ... ... ... ..Temp year
kentfield... ... ... ... ... .102 1989
san rafael... ... ... ... ... .99 2006
napa... ... ... ... ... ... ... 105 1981
san francisco... ... ... ... .97 1989
sfo airport... ... ... ... ... 98 1989
oakland airport... ... ... ..94 1957
richmond... ... ... ... ... ... 94 1989
livermore... ... ... ... ... .110 1961
moffett field... ... ... ... .99 1989
san jose... ... ... ... ... ..101 1989
gilroy... ... ... ... ... ... .110 1973
monterey bay area Thursday
location... ... ... ... .. Temp year
salinas... ... ... ... ... ... .89 1981
salinas airport... ... ... ..92 1947
king city... ... ... ... ... .110 1929

Marine As of 04:46 am pdt Thursday... Split flow with moderate
northwest winds primarily over the northern outer waters with
lighter southwest winds elsewhere. Hazardous seas from steep wind
waves and fresh swell can be expected over the outer waters
through the day. Look for gradually improving conditions late
today through the remainder of the week.

Mtr watches warnings advisories
Tday Heat advisory... Caz508 11 am til 9 pm
heat advisory... Caz506-513-516-518 til 9 pm
excessive heat warning... Caz507-510>512-517 til 9 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 9 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 pm
public forecast: rww
aviation: drp
marine: drp
fire weather: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi60 min N 1.9 G 4.1 65°F 74°F1004.9 hPa
LNDC1 30 mi60 min N 4.1 G 5.1 61°F 1005.4 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi60 min N 4.1 G 6 62°F 67°F1005.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi60 min WNW 4.1 G 5.1
OBXC1 33 mi60 min 61°F 57°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi60 min NW 7 G 8 60°F 1005.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi60 min WSW 4.1 G 5.1 61°F 1004.6 hPa
PXSC1 34 mi60 min 61°F 55°F
FTPC1 - 9414290 - San Francisco, CA 37 mi60 min WSW 7 G 13 57°F 59°F1005.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi60 min Calm G 1 63°F 1005.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi71 min Calm 62°F 1006 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi60 min Calm G 1 63°F 60°F1005.3 hPa
UPBC1 43 mi60 min WNW 13 G 17
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi60 min WNW 7 G 9.9 72°F 1004.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi60 min WNW 11 G 14 67°F 69°F1005.2 hPa59°F
46237 - San Francisco Bar, CA (142) 43 mi78 min 55°F6 ft
ELXC1 - Elkhorn Slough Reserve, CA 44 mi93 min NNW 1.9 53°F 1005 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi60 min SW 8 G 9.9 67°F 70°F1004.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi60 min W 2.9 G 5.1 65°F 1005.1 hPa
46092 - MBM1 46 mi71 min SE 7.8 51°F 55°F1005.9 hPa (+0.0)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi88 min SSE 5.8 G 9.7 55°F 55°F9 ft1005.1 hPa (+0.0)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA4 mi22 minN 09.00 miFair69°F61°F76%1006.3 hPa
San Jose, San Jose International Airport, CA4 mi25 minN 08.00 miFair71°F64°F79%1005.7 hPa
Palo Alto Airport, CA8 mi31 minN 010.00 miClear70°F60°F73%1005.8 hPa
San Jose / Reid / Hillv, CA10 mi28 minVar 510.00 miClear72°F59°F65%1006.4 hPa
San Carlos Airport, CA16 mi23 minNNW 35.00 miFair with Haze66°F57°F73%1006.1 hPa
Hayward, Hayward Air Terminal, CA18 mi24 minNW 36.00 miFair with Haze67°F54°F63%1006.6 hPa
Livermore, Livermore Municipal Airport, CA21 mi25 minN 010.00 miFair74°F62°F67%1005 hPa
Oakland, Metro Oakland International Airport, CA23 mi25 minNNW 36.00 miFair with Haze65°F57°F76%1005.9 hPa
San Francisco, San Francisco International Airport, CA24 mi22 minN 08.00 miFair63°F53°F70%1005.9 hPa

Wind History from SJC (wind in knots)
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Last 24hrSE55CalmE6CalmCalmN4NW8W12NW16NW12W7W5W5NW53CalmCalmSE3W5CalmCalmNW5Calm
1 day agoW44CalmSE5NW7NW9W10W13NW13NW13NW11NW11NW8NW10NW9NW6NW5NW4N3NW3CalmSE6SE7SE7
2 days agoSE5CalmSE7CalmNW7NW5NW13W13W12NW10W14W10W10NW5CalmNW4CalmW6W7N5NW4CalmW4NW5

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Thu -- 04:41 AM PDT     Moonrise
Thu -- 05:47 AM PDT     Sunrise
Thu -- 07:04 AM PDT     -1.04 feet Low Tide
Thu -- 12:50 PM PDT     7.80 feet High Tide
Thu -- 06:44 PM PDT     1.96 feet Low Tide
Thu -- 07:05 PM PDT     Moonset
Thu -- 08:32 PM PDT     Sunset
Thu -- 11:48 PM PDT     11.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.89.67.65.22.80.8-0.6-1-0.41.33.55.77.37.87.36.14.53.12.223.45.98.710.9

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
Thu -- 04:11 AM PDT     -1.66 knots Max Ebb
Thu -- 04:41 AM PDT     Moonrise
Thu -- 05:47 AM PDT     Sunrise
Thu -- 06:54 AM PDT     0.01 knots Slack
Thu -- 09:39 AM PDT     1.74 knots Max Flood
Thu -- 01:00 PM PDT     -0.00 knots Slack
Thu -- 04:45 PM PDT     -0.88 knots Max Ebb
Thu -- 06:44 PM PDT     0.00 knots Slack
Thu -- 07:06 PM PDT     Moonset
Thu -- 08:32 PM PDT     Sunset
Thu -- 09:22 PM PDT     1.40 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.7-1.2-1.5-1.7-1.4-0.80.11.11.61.71.40.80-0.4-0.7-0.8-0.9-0.50.20.91.41.30.9

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (10,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.