Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Santa Clara, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:12AMSunset 4:52PM Thursday December 13, 2018 2:15 PM PST (22:15 UTC) Moonrise 11:46AMMoonset 10:47PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 818 Am Pst Thu Dec 13 2018
.small craft advisory in effect through late Friday night...
Today..N winds up to 10 kt...becoming sw this afternoon. Wind waves 2 ft or less. NW swell 8 to 11 ft at 16 seconds.
Tonight..SE winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 8 to 10 ft at 16 seconds.
Fri..S winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft at 16 seconds. Rain likely.
Fri night..S winds 10 to 15 kt. Wind waves 2 ft or less. NW swell 9 to 12 ft at 16 seconds. Rain likely.
Sat..SE winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 9 to 12 ft at 16 seconds. A slight chance of showers.
Sat night..SE winds 5 to 10 kt. Wind waves 2 ft or less. W swell 6 to 9 ft at 16 seconds.
Sun..S winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 10 to 15 ft. Rain.
Mon..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 13 to 18 ft. A chance of showers.
PZZ500 818 Am Pst Thu Dec 13 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest swell will increase across the waters through Friday night creating hazardous conditions particularly for smaller vessels. A significant long period northwest swell is then expected to arrive late Sunday into Monday through Tuesday, with very long period forerunners arriving Sunday morning.


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 132207
afdmtr
area forecast discussion
national weather service san francisco bay area
207 pm pst Thu dec 13 2018

Synopsis Dry conditions are forecast to continue across our
region through Thursday night with mild temperatures. A weak
weather system will produce light rain later Friday and Friday
night, especially for areas north of the golden gate. Scattered
showers may continue into Saturday, mainly for the north bay. A
stronger and wetter system is then expected to produce widespread
rain across our entire region Sunday afternoon and Sunday night. A
return to dry weather is expected late Monday through early
Thursday as an upper level ridge builds into the area.

Discussion As of 02:06 pm pst Thursday... Upper level ridge
keeping the area dry and mild today. Temperatures so far have
warmed into the upper 50s to mid 60s making for a nice day across
the area. Expect temperatures to MAX out from the lower to upper
60s areawide, with a couple 70 degree readings possible in the
southern half of the cwa. High clouds will start to overspread the
area tonight ahead of an upper level trough approaching the west
coast. These high clouds will help to keep lows several degrees
warmer than last night.

The trough will push the upper ridge to the east tonight and the
trough axis will be located just offshore by midday Friday, but
will be weakening as it progresses east. Increasing moist
southwest flow will allow some light prefrontal showers to form
over the higher terrain Friday morning and afternoon. A cold front
with a decent moisture tap ahead of it will move into the north
bay during the afternoon and push south into the bay area by early
Friday evening. Ahead of this front, southerly winds could become
breezy at times. Showers will accompany the front as it moves
south, but rainfall is expected to be light. The front will stall
as it reaches the sf bay and will weaken overnight, and showers
will decrease in coverage Friday evening. The remnants of the
front are depicted by models to move back over the north bay on
Saturday, and scattered showers will persist near this boundary.

Rainfall amounts Friday through Saturday will be light to
locally moderate, with 0.5 to 1 inch in the north bay mountains,
0.25 to 0.5 inch in the north bay valleys, 0.1-0.25 across the bay
area, and less than 0.1 inches in the populated areas of the
central coast.

A stronger trough will then move through the area on Sunday and
Sunday night. Models have come into better agreement about the
nature of the trough, with both the GFS and euro mostly keeping
the trough together as it moves through and then splitting it as
it moves east from the area. The trough will feature an area of
high pwat ahead of the cold front with values between 1.1 to 1.25"
overhead by Sunday afternoon. The front will also be accompanied
by a decent cold front which will hold together as it moves
through the area. Given the high pwat, strong vorticity advection,
and cold front, this system will be prime to produce much more
widespread and potentially heavier rainfall than the system on
Friday. Light rain will develop in the north bay on Sunday morning as
moist onshore flow increases and will become heavier during the
afternoon as the trough and front approach. Moderate to locally
heavy rain will spread south during the late afternoon and
evening across the area, reaching the sf bay by late afternoon and
the monterey bay by mid to late evening. Rainfall amounts with
this system will be more substantial, with 0.5 to 1 inch in most
populated areas, with 1 to 1.5 inches in the north bay valleys and
coastal mountains and 1.5 to 2.5 inches in the north bay
mountains. South winds with this system could once again be breezy
ahead of the front, especially near the coast and in the higher
terrain.

The band of rainfall will be over the central coast early Monday
morning, with showers decreasing elsewhere. The band will move to
our east by Monday afternoon, leaving only isolated showers in
its wake. Models have come into better agreement about a ridge
building to our southwest on Tuesday. The ridge will likely build
to a high enough amplitude to push all rainfall to our north, with
only a slight chance of showers in sonoma county. Dry weather will
then continue into at least early Thursday. Models try to bring a
system into the area late next week, but differ on details.

Aviation As of 9:40 am pst Thursday... Ridge apex over central
california resulting in widespreadVFR with generally light
offshore winds and passing high clouds to the north this morning.

Arriving frontal boundary will bring increasing cloud cover from
north to south through the TAF period, with a shift towards wetter
showery pre frontal weather towards the end of the TAF period for
the northern 30-hour TAF sites.

Vicinity of ksfo...VFR today. Increasing clouds through the taf
period with prefrontal showers possible mid to late Friday
morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Breezy upvalley (se) winds in the
salinas valley thru this morning. Increasing clouds towards end of
taf period ahead of next frontal boundary.

Marine As of 09:29 am pst Thursday... Northwest swell will
increase across the waters through Friday night creating hazardous
conditions particularly for smaller vessels. A significant long
period northwest swell is then expected to arrive late Sunday
into Monday through Tuesday, with very long period forerunners
arriving Sunday morning.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Rough bar advisory for sf bar
public forecast: st
aviation: drp
marine: drp
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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 mi27 min SSE 1.9 G 1.9
AAMC1 - 9414750 - Alameda, CA 34 mi33 min SW 1.9 G 1.9
LNDC1 35 mi27 min SSE 2.9 G 4.1
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi33 min NNW 5.1 G 6
OBXC1 37 mi33 min 60°F 44°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi27 min NNW 5.1 G 6
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi27 min NW 7 G 9.9 57°F 1021.1 hPa
PXSC1 39 mi33 min 58°F 47°F
MLSC1 - Moss Landing, South Harbor, CA 40 mi46 min E 5.1 G 13 65°F 1021.7 hPa44°F
ELXC1 - Elkhorn Slough Reserve, CA 40 mi90 min E 5.1 66°F 1022 hPa43°F
FTPC1 - 9414290 - San Francisco, CA 42 mi33 min N 12 G 16
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi27 min NE 8.9 G 13 62°F 1022.4 hPa
46092 - MBM1 44 mi71 min NE 9.7 59°F 59°F1021.5 hPa (-2.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 46 mi27 min ESE 7 G 9.9 55°F 1023.4 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi27 min 56°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi34 min NNW 8 56°F 1022 hPa
PCOC1 - 9415144 - Port Chicago, CA 47 mi33 min ENE 8.9 G 9.9 54°F 53°F1023.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi33 min NE 5.1 G 7 55°F 54°F1023.2 hPa54°F
46237 - San Francisco Bar, CA (142) 48 mi75 min 56°F10 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi25 min ENE 7.8 G 9.7 58°F 59°F12 ft1020.3 hPa (-3.2)

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 mi22 minSSW 310.00 miFair62°F35°F37%1021.9 hPa
San Jose / Reid / Hillv, CA5 mi88 minVar 510.00 miClear63°F39°F42%1022.7 hPa
Mountain View, Moffett Field, CA9 mi19 minN 010.00 miFair62°F36°F38%1022.4 hPa
Palo Alto Airport, CA14 mi88 minNNW 810.00 miClear61°F37°F42%1023.7 hPa
San Carlos Airport, CA21 mi28 minN 010.00 miClear59°F37°F45%1022 hPa
Livermore, Livermore Municipal Airport, CA23 mi22 minENE 144.00 miFair with Haze56°F43°F62%1022.4 hPa
Hayward, Hayward Air Terminal, CA23 mi21 minVar 310.00 miFair62°F39°F43%1022.9 hPa

Wind History from SJC (wind in knots)
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Last 24hrNW13NW10NW7NW5CalmCalmS4CalmS3SW4S3CalmSW3CalmCalmCalmSE4S3CalmCalmCalmCalmCalmS3
1 day agoN6N6NW6W4CalmCalmSW3S3SE5CalmCalmS5E3SE3S3SE4SW3W3NW9NW12NW12NW14NW10NW12
2 days agoW9NW10NW10NW7W5W5CalmCalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalm55N4CalmNW4

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Thu -- 05:39 AM PST     7.92 feet High Tide
Thu -- 07:13 AM PST     Sunrise
Thu -- 11:46 AM PST     Moonrise
Thu -- 12:16 PM PST     3.38 feet Low Tide
Thu -- 04:03 PM PST     7.59 feet High Tide
Thu -- 04:50 PM PST     Sunset
Thu -- 10:47 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.51.63.35.26.87.77.97.46.55.54.53.73.43.75.16.77.67.46.75.74.32.91.70.9

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
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Thu -- 02:11 AM PST     1.14 knots Max Flood
Thu -- 05:45 AM PST     -0.01 knots Slack
Thu -- 07:14 AM PST     Sunrise
Thu -- 09:23 AM PST     -0.58 knots Max Ebb
Thu -- 11:46 AM PST     Moonrise
Thu -- 11:57 AM PST     0.00 knots Slack
Thu -- 02:03 PM PST     0.58 knots Max Flood
Thu -- 04:42 PM PST     -0.00 knots Slack
Thu -- 04:50 PM PST     Sunset
Thu -- 09:26 PM PST     -0.99 knots Max Ebb
Thu -- 10:48 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.11.10.80.4-0.1-0.3-0.5-0.6-0.5-0.300.40.60.50.2-0.1-0.3-0.6-0.8-1-0.9-0.5

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 (17,4,5,8)
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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.