Sunday, August18, 2019 L-36.com


Marine Weather and Tides
Sunnyvale, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:25AMSunset 7:57PM Sunday August 18, 2019 12:25 AM PDT (07:25 UTC) Moonrise 8:57PMMoonset 8:13AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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- 857 Pm Pdt Sat Aug 17 2019
.small craft advisory in effect until 11 pm pdt this evening...
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun night..SW winds 10 to 15 kt.
Mon..SW winds 10 to 15 kt.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt.
Tue night..SW winds 10 to 15 kt.
Wed..W winds 15 to 20 kt with gusts up to 25 kt.
Thu..SW winds 15 to 20 kt with gusts up to 25 kt.
PZZ500 857 Pm Pdt Sat Aug 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the california coast will weaken on Sunday as a low pressure system develops off british columbia. This will result in decreasing winds Sunday through the middle of next 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 180543
afdmtr
area forecast discussion
national weather service san francisco bay area
1043 pm pdt Sat aug 17 2019

Synopsis The cooling trend will continue into Sunday, with a
few additional degrees of cooling expected, especially inland.

Dry and seasonable temperatures are expected Monday and Tuesday
before the next warming trend begins midweek.

Discussion As of 9:00 pm pdt Saturday... The cooling trend that
got underway yesterday expanded farther inland today as the
marine layer depth increased to more than 2000 feet. Some inland
areas were more than 20 degrees cooler today compared to Friday.

More than 25 degrees of cooling has occurred since Thursday in
some locations. For example: kentfield's high of 100 on Thursday
was 26 degrees warmer than today's high of 74.

Data from the fort ord profiler indicates that the marine layer
depth has increased to about 3000 feet this evening and latest
satellite shows that all of santa cruz county is currently
blanketed with low clouds. Given the depth of the marine layer and
the moderate onshore flow in place, expect widespread low clouds
across our forecast area by Sunday morning. Will also likely see
patchy drizzle overnight and into Sunday morning, especially in
locations that experience upslope conditions in southwesterly flow
like santa cruz county. Both watsonville and corralitos picked up
measurable precipitation this morning (0.01") and it's possible
this may occur once again on Sunday morning as light southerly low
level flow persists. Most inland areas will clear by afternoon on
Sunday, but some coastal areas will probably experience all day
gray.

The upper trough responsible for our current cool-down will
continue to deepen over california through tomorrow, cooling the
airmass aloft over our area. This airmass cooling, combined with
the deep marine layer, will result in a continued downward trend
in high temperatures on Sunday, especially in the hills and in the
inland valleys where highs are forecast to decrease by another 5
degrees or more. Little additional cooling is expected in coastal
areas.

Temperatures are forecast to drift slightly higher on Monday and
Tuesday as an upper ridge over the southern plains builds westward
and heights begin to rise over california. But for the most part,
temperatures are expected to remain at least slightly cooler than
seasonal averages through Tuesday. More robust warming is
forecast to occur around midweek, but a trough approaching from
the west is expected to dampen the strengthening upper ridge and
keep most inland valley locations from warming past the lower 90s
during the second half of next week. The upshot is that the
upcoming midweek warmup is not expected to result in temperatures
anywhere near as warm as what occurred this past
Wednesday Thursday.

In the longer range, both the GFS and ECMWF ensemble means
indicate the potential for a more significant warmup next weekend
when an upper ridge is forecast to build off the northern
california coast. This particular location of upper ridge
development is often correlated with offshore surface flow which
would mean warming would occur in all areas, including the coast.

Aviation As of 10:41 pm pdt Saturday... Despite a deep marine
layer... Strong southerly flow is resulting in subsidence that is
keeping clouds out of the sfo bay area thus far. This is supported
by the southerly winds currently being reported at sfo and sjc.

Models keep southerly flow going through the night. Latest
forecast has only a tempo MVFR cig for sfo and the approach
between 12z and 16z and even that is low confidence as it could
stayVFR through Sunday.

Vicinity of ksfo...VFR expected. Possible tempo MVFR CIGS between
12z and 16z with bases around 1500 ft. South-southwest winds 10 kt
becoming more southwest Sunday afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... High-based stratus with bases 1500 feet.

Becoming sct at sns after 19z and mry after 20z.

Marine As of 10:29 pm pdt Saturday... High pressure off the
california coast will weaken on Sunday as a low pressure system
develops off british columbia. This will result in decreasing
winds Sunday through the middle of next week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay until 11 pm
public forecast: dykema
aviation: W pi
marine: W pi
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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 mi56 min S 4.1 G 7 62°F 77°F1010.3 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi62 min W 2.9 G 4.1 63°F 71°F1010.1 hPa
LNDC1 30 mi56 min W 4.1 G 6 63°F 1009.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi62 min WSW 8 G 8
OBXC1 33 mi56 min 62°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi56 min WSW 4.1 G 6 62°F 1009.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi56 min S 2.9 G 5.1 61°F 1008.7 hPa
FTPC1 - 9414290 - San Francisco, CA 37 mi62 min SW 9.9 G 14 60°F 61°F1010 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi56 min SW 17 G 21 62°F 1009.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi45 min W 8 60°F 1010 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi56 min 65°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi56 min WNW 15 G 20 64°F 1007.4 hPa
UPBC1 43 mi56 min W 9.9 G 14
46237 - San Francisco Bar, CA (142) 43 mi56 min 60°F4 ft
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi62 min WSW 7 G 12 62°F 72°F1009.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi56 min WSW 12 G 17 62°F 73°F1008.8 hPa
MLSC1 - Moss Landing, South Harbor, CA 44 mi47 min SW 5.1 G 13 61°F 1011.9 hPa56°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi101 min SW 4.1 61°F 1010 hPa57°F
46092 - MBM1 46 mi76 min SW 5.8 61°F 60°F1011.3 hPa (+0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi56 min WSW 17 G 22 62°F 1008.7 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi36 min NW 5.8 G 5.8 62°F 62°F6 ft1010.8 hPa (+0.4)

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, CA4 mi93 minSE 810.00 miFair62°F60°F93%1009.9 hPa
Mountain View, Moffett Field, CA4 mi90 minSE 910.00 miFair63°F54°F73%1010 hPa
Palo Alto Airport, CA8 mi3.6 hrsWSW 610.00 miClear64°F55°F73%1009.1 hPa
San Jose / Reid / Hillv, CA10 mi2.6 hrsSSE 910.00 miClear63°F53°F73%1009.8 hPa
San Carlos Airport, CA16 mi3.5 hrsWSW 410.00 miClear64°F53°F68%1009.5 hPa
Hayward, Hayward Air Terminal, CA18 mi92 minSSE 310.00 miFair64°F55°F73%1010.4 hPa
Livermore, Livermore Municipal Airport, CA21 mi93 minNW 710.00 miFair61°F54°F78%1008.9 hPa
Oakland, Metro Oakland International Airport, CA23 mi93 minSW 1310.00 miA Few Clouds65°F55°F73%1009.6 hPa
San Francisco, San Francisco International Airport, CA24 mi90 minSSW 910.00 miFair63°F53°F70%1009.6 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hr------------SE12SE10SE13SE13S10S7S8S10S10S9NW13N12N10N8SE8SE8SE8SE10
1 day ago----S3S3------S6S73SE9Calm--NW13--NW10NW10--NW12NW12--SE4--SE10
2 days agoSE3S3S3CalmCalmCalmCalmCalmNW3N44Calm5N9NW9NW12--NW12----W7W4SW4--

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Sun -- 02:38 AM PDT     9.14 feet High Tide
Sun -- 06:26 AM PDT     Sunrise
Sun -- 09:13 AM PDT     Moonset
Sun -- 10:18 AM PDT     0.50 feet Low Tide
Sun -- 03:52 PM PDT     8.50 feet High Tide
Sun -- 07:56 PM PDT     Sunset
Sun -- 09:56 PM PDT     Moonrise
Sun -- 10:36 PM PDT     2.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.17.28.89.18.57.45.73.92.31.10.50.82.34.36.588.58.17.15.74.33.12.52.5

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
Sun -- 12:12 AM PDT     1.09 knots Max Flood
Sun -- 03:08 AM PDT     -0.00 knots Slack
Sun -- 06:26 AM PDT     Sunrise
Sun -- 07:38 AM PDT     -1.23 knots Max Ebb
Sun -- 09:14 AM PDT     Moonset
Sun -- 10:10 AM PDT     0.01 knots Slack
Sun -- 12:48 PM PDT     1.29 knots Max Flood
Sun -- 04:05 PM PDT     -0.01 knots Slack
Sun -- 07:56 PM PDT     Sunset
Sun -- 08:05 PM PDT     -0.91 knots Max Ebb
Sun -- 09:57 PM PDT     Moonrise
Sun -- 10:19 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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1.110.60.1-0.3-0.7-1-1.2-1.2-0.7-0.10.61.11.31.10.70.1-0.3-0.6-0.8-0.9-0.7-0.20.4

Weather Map and Satellite Images
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GOES 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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Wind Forecast for San Francisco/Monterey Bay Area, CA (3,6,7,8)
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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.