Sunday, November19, 2017 L-36.com


Marine Weather and Tides
Union City, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 6:52AMSunset 4:55PM Sunday November 19, 2017 1:43 PM PST (21:43 UTC) Moonrise 7:47AMMoonset 6:11PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 831 Am Pst Sun Nov 19 2017
Today..E winds 5 kt...becoming nw in the afternoon.
Tonight..W winds 5 kt...becoming southeast after midnight.
Mon..NE winds 5 kt. Slight chance of rain.
Mon night..N winds 10 kt.
Tue..NW winds 10 kt.
Wed..NW winds 5 kt.
Thanksgiving day..NW winds 5 kt.
PZZ500 831 Am Pst Sun Nov 19 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the coast of central california will continue bring light west to northwest winds today for the southern coastal waters. Winds will switch out of the south through the day today for the northern coastal waters, ahead of a frontal system. The front will stall off the southern oregon/northern california coast, so southerly winds will persist.

7 Day Forecast for Marine Location Near Union City, CA
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location: 37.6, -122     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191740
afdmtr
area forecast discussion
national weather service san francisco bay area
940 am pst Sun nov 19 2017

Synopsis Dry weather will continue through the end of the
weekend, with mild days and cool nights. The next weather system
will bring rain chances late tonight and Monday, mainly across
the north bay. There is a slight chance of additional rainfall at
times in the north bay for much of this week, but most of our
area is forecast to be warm and dry through thanksgiving.

Discussion As of 08:27 am pst Sunday... Despite high clouds
overspreading the bay area overnight and early this morning it's a
chilly start for many locations. Overnight lows were generally in
the 30s and 40s, even urban area. Protect valleys and interior
locations had several locations dip into the upper 20s. One of the
coldest spots this morning was the marquez raws in san benito
county hitting 26 degrees.

For today, widespread cirrus is expected over the region resulting
in filtered sunshine. None the less, temperatures will be with in
a few degrees of yesterday's MAX temps. Highs will be in the upper
50s to mid 60s across the north bay (a few degrees below
normal), low 60s sf bay (near normal), 60s to lower 70s
monterey san benito (a few above normal).

No update is needed.

Prev discussion As of 3:15 am pst Sunday...

today's weather is expected to be much like yesterday's, except
for more widespread high cloud cover. Afternoon highs will be
mostly in the 60s and winds will remain light.

Early morning satellite shows a plume of moisture over the
eastern pacific, approaching from the southwest. Precipitable water
values in this plume are in excess of 2 inches out near 30n 140w.

Meanwhile, a frontal boundary off the coast of washington and
oregon is sagging slowly to the southeast. This frontal boundary
is forecast to make its way into northwest california by late
tonight, but any farther southward progression will be thwarted
by an upper ridge that will be building over central and southern
california. In any case, the models indicate there will be
sufficient warm advection acting on the moisture plume to produce
rainfall across the north bay late tonight and Monday. Elsewhere
across our region, subsidence under the building upper ridge is
expected to inhibit the development of precipitation, although
isolated light rain may occur as far south as the san francisco
peninsula and the east bay on Monday. Most models indicate that
rainfall totals in the north bay through late Monday will be on
the order of a quarter of an inch or less. However, the 06z nam
has trended wetter and forecasts as much as 1.5 inches of rain in
northwest sonoma county by late Monday. There certainly is
sufficient moisture approaching to produce these heavier rainfall
amounts, but given recent model trends of building the upper ridge
more strongly over california, these higher totals seem unlikely.

As is the often the case in situations such as this with moist
flow and warm advection under relatively high heights, there will
probably be a sharp gradient between soaking rains to the north
and no rain at all to the south. And that sharp precipitation
gradient will most likely set up somewhere near the
mendocino sonoma county line.

Rainfall in the north bay is expected to taper off Monday evening
and end by late Monday night. The upper ridge is forecast to
continue strengthening across the southwestern united states
through midweek. Meanwhile, moist southwesterly flow will continue
between this ridge and a deepening trough offshore near 145w. The
models agree that this moisture will remain completely north and
west of our area on Tuesday and Wednesday, and then perhaps sag
back south into the far northwest corner of our forecast area by
thanksgiving. But for the most part, the upper ridge will maintain
dry and warm conditions across nearly all of our forecast area
from Tuesday through thanksgiving. Widespread high temperatures in
the 70s are forecast during this period of time, with some low to
mid 80s likely from monterey bay southward.

The longer range models indicate the ridge will shift far enough
to the east late in the week to allow precipitation to gradually
spread into our forecast area between Thursday night and next
weekend. However, there are considerable model differences
regarding timing and location of rainfall late in the extended
forecast period.

Aviation As of 9:35 am pst Sunday... For 18z tafs. With the
exception of ksts,VFR anticipated through the forecast period.

The tail end of a storm system will drop south into the northern
part of the bay area, lowering CIGS overnight, but should remain
above 3000 ft at all TAF terminals but ksts. Light to moderate
showers are possible early Monday morning for the north bay, which
will likely drop CIGS vis to MVFR, possibly ifr at times.

Generally light winds today, turning S SE overnight and remaining
below 10 knots.

Moderate to high confidence.

Vicinity of ksfo...VFR. Light winds throughout the day today. Cigs
remaining above 3000 feet overnight.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR. Generally light winds, with highest
winds (around 10 knots) in the salinas valley through 19-20z,
then becoming light and variable in the afternoon.

Marine As of 09:23 am pst Sunday... High pressure off the coast
of central california will continue bring light west to northwest
winds today for the southern coastal waters. Winds will switch
out of the south through the day today for the northern coastal
waters, ahead of a frontal system. The front will stall off the
southern oregon northern california coast, so southerly winds will
persist.

Mtr watches warnings advisories
Tday None.

Public forecast: mm dykema
aviation: bam
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 13 mi43 min N 4.1 G 5.1 57°F 60°F1019.4 hPa (-2.1)
LNDC1 20 mi43 min WNW 4.1 G 7 57°F 1019 hPa (-2.3)
AAMC1 - 9414750 - Alameda, CA 20 mi43 min W 4.1 G 6 58°F 58°F1019.5 hPa (-2.3)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi43 min WNW 5.1 G 6
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi43 min NW 5.1 G 5.1 55°F 1019.1 hPa (-2.3)
OBXC1 23 mi43 min 56°F 46°F
PXSC1 25 mi43 min 55°F 47°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi43 min NNW 6 G 8 60°F 1019.3 hPa (-2.2)
FTPC1 - 9414290 - San Francisco, CA 29 mi43 min E 5.1 G 5.1 55°F 57°F1019.6 hPa (-2.2)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 31 mi43 min E 1 G 2.9 58°F 1019.2 hPa (-2.4)
RCMC1 - 9414863 - Richmond, CA 31 mi43 min NW 6 G 6 56°F 58°F1019.1 hPa (-2.3)
MZXC1 - 9415102 - Martinez-Amorco CA 31 mi43 min NE 4.1 G 5.1 56°F 59°F1019.6 hPa (-2.2)45°F
PCOC1 - 9415144 - Port Chicago, CA 32 mi43 min ENE 4.1 G 5.1 57°F 58°F1019.3 hPa (-2.1)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi49 min E 8.9 G 11 58°F 1018.9 hPa
46237 - San Francisco Bar, CA (142) 36 mi73 min 57°F2 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi58 min E 5.1 62°F 1019 hPa37°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi53 min E 5.8 G 7.8 55°F 57°F3 ft1019 hPa (-1.9)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi53 min NNW 1.9 G 1.9 57°F 60°F3 ft1018.7 hPa (-1.7)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA8 mi49 minW 510.00 miFair61°F43°F52%1019.8 hPa
Palo Alto Airport, CA10 mi56 minNNW 410.00 miPartly Cloudy59°F46°F63%1019 hPa
Mountain View, Moffett Field, CA12 mi47 minNNW 410.00 miFair60°F41°F50%1019.2 hPa
Livermore, Livermore Municipal Airport, CA12 mi50 minE 710.00 miFair62°F44°F52%1018.4 hPa
San Carlos Airport, CA14 mi1.9 hrsVar 310.00 miMostly Cloudy57°F44°F63%1020.3 hPa
Oakland, Metro Oakland International Airport, CA14 mi50 minW 710.00 miMostly Cloudy57°F48°F72%1019 hPa
San Jose, San Jose International Airport, CA16 mi50 minN 010.00 miMostly Cloudy63°F43°F48%1018.5 hPa
San Francisco, San Francisco International Airport, CA19 mi47 minNNE 510.00 miMostly Cloudy57°F46°F69%1019.1 hPa
San Jose / Reid / Hillv, CA20 mi56 minW 410.00 miMostly Cloudy64°F42°F46%1017.9 hPa

Wind History from HWD (wind in knots)
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Last 24hrW7NW5W5NW4CalmN5NE5NE5E5CalmE3NE6CalmE3E3CalmE3E4CalmCalmCalmSW4NW3W5
1 day agoN6NE8NE10NE8NE3CalmE3E4E4CalmE4E5E6NE4CalmE3E6CalmNE5NE53E3W9W5
2 days agoCalmCalmNW4CalmCalmCalmCalmS5S4W10
G15
NW13W9W8W7NE4CalmNE5NE3E3N3NW5N4N5NE7

Tide / Current Tables for Newark Slough, San Francisco Bay, California
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Newark Slough
Click for Map
Sun -- 01:40 AM PST     7.32 feet High Tide
Sun -- 06:52 AM PST     Sunrise
Sun -- 07:12 AM PST     2.59 feet Low Tide
Sun -- 07:47 AM PST     Moonrise
Sun -- 12:30 PM PST     8.49 feet High Tide
Sun -- 04:54 PM PST     Sunset
Sun -- 06:11 PM PST     Moonset
Sun -- 07:56 PM PST     -0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.17.17.36.75.54.23.12.62.94.15.77.38.38.47.76.44.62.71.10-0.30.31.63.3

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Sun -- 02:37 AM PST     -0.00 knots Slack
Sun -- 04:35 AM PST     -0.69 knots Max Ebb
Sun -- 06:52 AM PST     Sunrise
Sun -- 07:18 AM PST     0.00 knots Slack
Sun -- 07:47 AM PST     Moonrise
Sun -- 10:24 AM PST     1.33 knots Max Flood
Sun -- 01:43 PM PST     -0.00 knots Slack
Sun -- 04:38 PM PST     -1.53 knots Max Ebb
Sun -- 04:54 PM PST     Sunset
Sun -- 06:11 PM PST     Moonset
Sun -- 08:09 PM PST     0.00 knots Slack
Sun -- 11:23 PM PST     1.70 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.10.4-0.2-0.6-0.7-0.5-0.10.411.31.310.5-0.2-0.9-1.4-1.5-1.2-0.8-0.10.71.31.7

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 (16,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.