Wednesday, June20, 2018 L-36.com


Marine Weather and Tides
Sunnyvale, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:45AMSunset 8:33PM Wednesday June 20, 2018 6:29 AM PDT (13:29 UTC) Moonrise 12:29PMMoonset 12:25AM Illumination 46% Phase: First Quarter Moon; Moon at 7 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- 256 Am Pdt Wed Jun 20 2018
.small craft advisory in effect from noon pdt today through this evening...
Today..SW winds 15 to 25 kt.
Tonight..SW winds 15 to 25 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 10 to 20 kt.
Fri..SW winds 10 to 20 kt.
Sat..W winds 10 to 20 kt.
Sun..SW winds 10 to 20 kt.
PZZ500 256 Am Pdt Wed Jun 20 2018
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 continue to strengthen through the day resulting in increasing northwest winds, which will prevail through much of the upcoming weekend. Sustained gale force winds are expected along the big sur coast, south of point pinos, this afternoon and evening. Gale force winds will also be possible for the northern outer waters, north of pigeon point, Friday evening through Saturday morning. More details will be addressed in future updates. Steep fresh swell from strong winds will create hazardous seas into the weekend, particularly for operators of small crafts.

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 201153
afdmtr
area forecast discussion
national weather service san francisco bay area
453 am pdt Wed jun 20 2018

Synopsis Not much change in weather conditions through
Thursday, then a pronounced warming trend for the end of the week
as high pressure builds in and winds turn more offshore. A return
to cooling and redevelopment of the marine layer appears in store
for Sunday into the first part of next week as flow shifts back
onshore.

Discussion As of 3:30 pm pdt Wednesday... Goes-east fog product
reveals another morning of stratus across much of the pacific
coast and pushing into parts of the san francisco bay area. The
fort ord profiler indicates the marine layer is ~ 1000 ft deep, or
within a few hundred feet of what it was this time yesterday
morning. The shallow marine layer will bring localized fog to
parts of the coast again this morning. If you encounter decreased
visibilities for your morning commute, be mindful of your speed,
following distance, and make sure your headlights are turned on.

Synoptically-speaking, an upper level ridge continues to build
with its center located just off the baja california coast. Over
the next 24 hours, a shortwave trough will ripple through this
ridge's outer periphery and clip northern california. While no
precipitation is expected with this shortwave, this should limit
substantial warming for the north bay this afternoon. Southern
portions of the CWA such as the southern salinas valley and
interior san benito counties will probably be too far south to see
any influence from this shortwave and would be the most likely
locations to experience 3-6 degrees of warming from yesterday to
today.

The shortwave will quickly push east toward the northern rockies
by Thursday. For the san francisco bay area and central california
coast, not expecting much change from Wednesday to Thursday for
afternoon highs as the upper level ridge flattens. The ridge won't
stay flattened for long as models agree that broad high will
build offshore, pushing 500 mb heights over the bay area anywhere
from 590 to 592 dam by Saturday. At the surface, this will result
in hot conditions, mostly for interior locations, where highs are
expected to soar to the middle upper 90s to the triple digits.

Locations along the immediate pacific coast should remain
protected from these hot temperatures with just enough of an
onshore flow. This all changes as you head inland and or up in
elevation.

The big question at this point in time is exactly how hot it will
get along the sf bay shoreline for Saturday. One tool forecasters
use for determining the potential outcomes is through ensemble
forecasting. An ensemble is comprised of ensemble members
(anywhere from a dozen to several dozen, depending on the model),
each of which produces a slightly different forecast solution. The
spread of these forecast solutions is valuable to meteorologists
as we can see the potential spread through all the ensemble
members. Now, when looking at the ECMWF ensemble prediction system
(eps) for Saturday's heat event, some of the hottest ensemble
members -- at sjc, for example -- do exceed 100 deg f. The current
forecast package for Saturday does bump up maximum temperatures a
bit along the sf bay shoreline and the south bay, though
confidence still remains on the low side in regard to these exact
values as there remains a rather large spread in possible
outcomes. The potential heat risks based on this forecast does
introduce widespread moderate and isolated high risks across the
north bay east bay interior, south bay, and interior monterey +
san benito counties. Still a bit early to launch any headlines,
but if the current forecast holds, we'd likely be looking at heat
advisories for the warmest locations. Overnight low temperatures
will remain elevated in the thermal belts with some locations
at above ~ 1000 ft elevation likely to only cool to the mid upper
60s to 70s.

Another thing to mention for the late Friday to Saturday timeframe
is the potential for gusty winds in the higher elevations. The
gfs does advertise north to northeast winds for the north and east
bay hills mountains that could produce elevated fire weather
concerns. Will continue to monitor these forecast trends,
especially as we approach the event when the higher resolution
models are able to capture this with finer detail.

Models for Sunday suggest the start of what would be a welcomed
cooling trend across the interior. The latest GFS run even brings
in what could be a southerly surge along the big sur coast,
pushing north toward the santa cruz and san mateo coasts through
the day. Additional cooling is expected for much of the region --
especially interior locations -- heading into the beginning of
next week.

Aviation As of 4:53 am pdt Wednesday... For 12z tafs. Fort ord
profiler shows the marine layer depth around 1000 feet. Surface
obs across the CWA show a mixed bag of flight categories, fromVFR
for inland terminals to lifr at immediate coastal terminals.

ExpectVFR at all terminals between 16-18z this morning. Moderate
onshore flow this afternoon will increase winds around 12-15 kts,
with locally higher gusts. Stratus will push back in again
tonight, but low confidence on exact timing and coverage.

Vicinity of ksfo... Borderline MVFR ifr CIGS will gradually lift
and mix out through the morning, becomingVFR by 17-18z. Onshore
winds around 20 kt, with gusts near 30 kt this afternoon and
evening. MVFR ifr CIGS likely again tonight, best guess around
midnight, give take a couple of hours.

Sfo bridge approach... Ifr through about 16-17z, thenVFR.

Monterey bay terminals... Lifr CIGS to ifr MVFR by 15-16z, then
vfr by 17-18z. West northwest winds 10-15 kt this afternoon and
early evening. Ifr lifr CIGS return this evening, around 02-03z.

Marine As of 2:56 am pdt Wednesday... High pressure off the
california coast will continue to strengthen through the day
resulting in increasing northwest winds, which will prevail
through much of the upcoming weekend. Sustained gale force winds
are expected along the big sur coast, south of point pinos, this
afternoon and evening. Gale force winds will also be possible for
the northern outer waters, north of pigeon point, Friday evening
through Saturday morning. More details will be addressed in future
updates. Steep fresh swell from strong winds will create
hazardous seas into the weekend, particularly for operators of
small crafts.

Fire weather As of 3:30 am pdt Wednesday... A pronounced
warming and drying trend is forecast for the end of the week as
high pressure builds in and winds turn offshore. Saturday
presently looks to be the hottest day, with poor overnight
relative humidity recoveries for both Friday night and Saturday
night. Locally gusty north to northeast winds are possible in the
north and east bay hills Friday night and Saturday morning. A
return to cooling and redevelopment of the marine layer appears in
store for Sunday into the first part of next week as flow shifts
back onshore.

Mtr watches warnings advisories
Tday Sca... Sf bay from 12 pm
sca... Mry bay from 12 pm
sca... Pigeon pt to pt pinos 0-10 nm from 12 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 12 pm
sca... Pt arena to pigeon pt 10-60 nm from 12 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 2 pm
glw... Pt pinos to pt piedras blancas 0-10 nm from 2 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm from 2 pm
public forecast: rowe
aviation: bam
marine: bam
fire weather: blier rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi41 min W 7 G 8.9 55°F 70°F1017.1 hPa
LNDC1 30 mi41 min WSW 8 G 8.9 54°F 1016.3 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi47 min W 6 G 11 54°F 66°F1016.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi41 min W 5.1 G 8
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi41 min WSW 5.1 G 7 54°F 1016.3 hPa
OBXC1 33 mi41 min 54°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 34 mi41 min WSW 4.1 G 8 53°F 1015.3 hPa
PXSC1 34 mi47 min 54°F 53°F
FTPC1 - 9414290 - San Francisco, CA 37 mi47 min WSW 2.9 G 7 53°F 57°F1016.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 39 mi41 min WNW 1 G 2.9 55°F 1016.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 41 mi42 min SSE 1.9 53°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 42 mi47 min NW 6 G 7 54°F 61°F1015.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi41 min WSW 12 G 15 67°F1015.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi41 min WNW 14 G 20 56°F 1013.7 hPa
46237 - San Francisco Bar, CA (142) 43 mi59 min 55°F4 ft
PCOC1 - 9415144 - Port Chicago, CA 44 mi41 min SW 17 G 20 54°F 67°F1015.1 hPa
ELXC1 - Elkhorn Slough Reserve, CA 44 mi104 min SE 2.9 53°F 1016 hPa53°F
46092 - MBM1 46 mi85 min WNW 18 53°F 53°F1015.5 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 46 mi41 min W 8.9 G 14 55°F 1015.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 48 mi39 min NNW 12 G 16 53°F 53°F5 ft1017.3 hPa (-0.3)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi39 min NNW 18 G 23 53°F 56°F6 ft1015.5 hPa (-0.3)

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA4 mi33 minN 010.00 miOvercast56°F50°F81%1017.1 hPa
San Jose, San Jose International Airport, CA4 mi36 minNNW 610.00 miOvercast57°F51°F81%1016.6 hPa
San Carlos Airport, CA16 mi34 minWNW 810.00 miOvercast54°F50°F88%1016.6 hPa
Hayward, Hayward Air Terminal, CA18 mi35 minW 410.00 miOvercast56°F50°F81%1017.5 hPa
Livermore, Livermore Municipal Airport, CA21 mi36 minW 510.00 miOvercast54°F0°F%1015.8 hPa
Oakland, Metro Oakland International Airport, CA23 mi36 minWNW 76.00 miFog/Mist54°F51°F90%1016.5 hPa
San Francisco, San Francisco International Airport, CA24 mi33 minWSW 710.00 miOvercast55°F48°F80%1016.4 hPa

Wind History from SJC (wind in knots)
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Last 24hrW4CalmCalmNW7NW6NW7NW9W11W7W9NW15W11W13NW12NW11NW8W5NW5NW5NW4NW6NW9NW8NW6
1 day agoS3CalmCalmSW36NW8NW10W11
G19
NW14W14W14W12W13W14W9W7W6W5NW4NW6NW5CalmCalmNW3
2 days agoE8E9SE76SE6S10S10--S9SE7W7NW8NW12NW12NW9NW10NW6N4NW4S4S3E4SE5SE3

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Wed -- 01:25 AM PDT     Moonset
Wed -- 02:20 AM PDT     1.90 feet Low Tide
Wed -- 03:52 AM PDT     First Quarter
Wed -- 05:47 AM PDT     Sunrise
Wed -- 06:40 AM PDT     7.67 feet High Tide
Wed -- 01:29 PM PDT     Moonrise
Wed -- 02:13 PM PDT     0.21 feet Low Tide
Wed -- 08:09 PM PDT     9.57 feet High Tide
Wed -- 08:31 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.52.51.92.23.75.77.37.67.26.14.73.11.70.70.20.62.14.36.78.69.69.38.36.7

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
Wed -- 01:26 AM PDT     Moonset
Wed -- 02:02 AM PDT     0.00 knots Slack
Wed -- 03:52 AM PDT     First Quarter
Wed -- 04:22 AM PDT     0.86 knots Max Flood
Wed -- 05:47 AM PDT     Sunrise
Wed -- 07:11 AM PDT     -0.00 knots Slack
Wed -- 11:31 AM PDT     -0.99 knots Max Ebb
Wed -- 01:29 PM PDT     Moonrise
Wed -- 02:11 PM PDT     0.01 knots Slack
Wed -- 05:04 PM PDT     1.30 knots Max Flood
Wed -- 08:16 PM PDT     -0.00 knots Slack
Wed -- 08:32 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.5-00.50.80.80.60.1-0.3-0.6-0.8-1-0.9-0.6-0.10.61.11.31.20.80.2-0.3-0.6-0.8

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 (9,2,3,4)
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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.