Sunday, January21, 2018 L-36.com


Marine Weather and Tides
San Leandro, 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 7:17AMSunset 5:22PM Sunday January 21, 2018 4:55 AM PST (12:55 UTC) Moonrise 10:04AMMoonset 9:56PM Illumination 23% Phase: Waxing Crescent; Moon at 5 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- 212 Am Pst Sun Jan 21 2018
Today..S winds 10 kt. Slight chance of rain in the afternoon.
Tonight..S winds 5 to 15 kt. Chance of rain in the evening, then rain likely after midnight.
Mon..S winds 5 to 15 kt. Slight chance of rain in the morning.
Mon night..N winds 10 kt.
Tue..NW winds 10 kt.
Wed..SE winds 5 to 15 kt...becoming w. Chance of rain.
Thu..W winds 10 kt. Slight chance of showers.
PZZ500 212 Am Pst Sun Jan 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will increase and become southwesterly later this morning, especially for the northern coastal waters, ahead of an arriving weak cold front. The cold front is forecast to pass through Monday morning and will switch winds out of the north again. Small craft advisories are in place for most coastal water zones mainly due to squared and hazardous seas over the next couple of days. A new northwest swell train arrives by this evening.

7 Day Forecast for Marine Location Near San Leandro, CA
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location: 37.68, -122.17     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211202
afdmtr
area forecast discussion
national weather service san francisco bay area
402 am pst Sun jan 21 2018

Synopsis Dry and cool weather is forecast to continue across
our entire area through at least midday Sunday. The next system
is expected to spread rain across primarily the northern portion
of the forecast area late Sunday and Sunday night. The weather
pattern will remain active into next week, with more rain likely
by midweek.

Discussion As of 8:55 pm pst Saturday... After a cool start
this morning, afternoon highs reached seasonable mid and upper
50s. Expect another cool night tonight, but not quite as cool as
last night since the airmass over our region has begun to moderate
and high clouds are starting to increase.

Evening IR satellite imagery shows a band of clouds associated
with a frontal boundary extending from near the ca or border west-
southwest across the northeast pacific. Moisture within this
boundary is relatively plentiful with precipitable water values
approaching 1.5 inches. The models agree that this frontal
boundary will sag slowly to the southeast over the next 36 hours,
and bring rainfall to much of our forecast area from late Sunday
through early Monday. Recent model output has slowed the southward
progression of the boundary and thus delayed the onset of
precipitation. Rain is not expected to develop in the north bay
until mid-to-late afternoon Sunday, with rain then forecast to
gradually spread across most of the rest of the sf bay area by
late Sunday night. Rain may then reach as far south as the
monterey bay area by Monday morning before the frontal boundary
dissipates.

The bulk of the rainfall with this system is expected to be
generated by warm advection processes and fall across northern
california, generally north of i-80. Rainfall amounts are
projected to fall off precipitously to the south of i-80. In our
forecast area, only the north bay is expected to pick up
significant precipitation with this system. Rainfall will
initially be light in the north bay on Sunday afternoon, but rain
rates are then expected to increase Sunday evening with periods of
heavy rain possible across portions of the north bay from late
Sunday evening through late Sunday night. However, model rainfall
amounts have recently been trending lower. For instance,
yesterday the NAM and GFS were forecasting as much as 2.5 inches
of rain with this system in the north bay. Now, the latest nam
and GFS (00z runs) forecast maximum rainfall values of only about
half that much. And, rain totals across the north bay burn scars
are now forecast by the NAM and GFS to be only slightly more than
a half inch. Of course, these courser-scale models tend to miss
some of the orographic enhancement and therefore tend to
underestimate rainfall maxima. So we still could see locally as
much as 2 inches of rain in northwest sonoma county and as much as
an inch or more across the burn scars. In any event, concern for
debris flows flash flooding in and near the north bay burn scars
has decreased now that the models are trending somewhat drier.

Besides trending drier, the models have also shown a trend towards
less wind with this upcoming system. Southerly winds may gust
locally as high as 35 mph along the north bay coast late Sunday
afternoon and Sunday evening, but winds are not expected to reach
advisory levels.

Rain is expected to linger into Monday morning as the frontal
boundary dissipates over the southern portion of our area. Most
models end all rain by midday Monday. Dry weather is expected to
return by Monday afternoon and temperatures will be mild due to
lack of cold advection with this system.

Shortwave ridging is forecast to maintain dry and mild conditions
from Monday afternoon through Tuesday and Tuesday night. The next
system is expected to bring rain to our area area Wednesday and
Wednesday night. This midweek system is forecast drive a strong
cold front through our entire forecast area, which will mean a
potential for soaking rains regionwide. Brief heavy rain and locally
strong and gusty winds may also be factors with the midweek
system. Showers will linger into Thursday, with a return to dry
weather conditions expected by late in the week.

Aviation As of 3:59 am pst Sunday for 12z tafs. Current fog
product shows streaming high clouds overhead, with no signs of
stratus across the district. However, lastest ksts and kapc obs
are now reporting light patchy fog. Expect intermittent fog
through 15-16z for north bay terminals. Still monitoring for low
clouds fog development around the greater san francisco bay area
over the next couple of hour, hinted by the 00z mtrwrf model. Kept
tempo group in TAF for koak and ksfo through 15z, just in case.

Dewpoint depressions at ksfo and koak are 6f and 0f, respectively.

An upper level system approaching the bay area will introduce
rain beginning this afternoon for the north bay, therefore
lowering CIGS in the process. Current thinking is rain will begin
around or slightly after 00z Mon at ksts, then progress southward
through the sf bay area by 03-05z. It looks like rain will affect
monterey bay terminals after 12z mon. Rainfall may be moderate
and occasionally heavy at times. This will likely drop CIGS vsby
down to ifr or lifr during heavier showers. Winds are expected to
be mainly southwesterly southerly through the forecast period,
between 08-12 kt.

Vicinity of ksfo... Slight chance of MVFR CIGS through 15z this
morning. OtherwiseVFR expected through this afternoon. CIGS will
gradually lower through the afternoon and are expected to be MVFR
this evening. Light east southeast winds this morning will turn
more southerly southwesterly and increase by afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions are expected to prevail
through the forecast period, with high cloud. Generally light
winds. Rain chances increase after 12z Monday.

Marine As of 2:35 am pst Sunday... Winds will increase and
become southwesterly later this morning, especially for the
northern coastal waters, ahead of an arriving weak cold front. The
cold front is forecast to pass through Monday morning and will
switch winds out of the north again. Small craft advisories are in
place for most coastal water zones mainly due to squared and
hazardous seas over the next couple of days. A new northwest swell
train arrives by this evening.

Mtr watches warnings advisories
Tday Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 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... Sf bay from 3 pm
public forecast: dykema
aviation: bam
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi44 min E 4.1 G 6 45°F 54°F1025.8 hPa
LNDC1 10 mi38 min E 1.9 G 4.1 46°F 1025.8 hPa
OBXC1 12 mi38 min 47°F 44°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi38 min ESE 8 G 8
RTYC1 - 9414523 - Redwood City, CA 12 mi38 min S 1.9 G 1.9 42°F 55°F1026.4 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi38 min SE 5.1 G 6 44°F 1025.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi38 min ESE 9.9 G 11 48°F 1024.6 hPa
PXSC1 15 mi38 min 49°F 47°F
FTPC1 - 9414290 - San Francisco, CA 18 mi44 min SSW 1.9 G 4.1 45°F 54°F1026 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi44 min ESE 5.1 G 5.1 47°F 1025.9 hPa
RCMC1 - 9414863 - Richmond, CA 21 mi44 min SSE 5.1 G 7 49°F 53°F1025.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 25 mi38 min SSE 1.9 G 2.9 42°F 52°F1025.9 hPa42°F
46237 - San Francisco Bar, CA (142) 26 mi56 min 53°F8 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi38 min SSE 2.9 G 4.1 44°F 1025.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi38 min S 8 G 11 40°F 51°F1025.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 29 mi50 min S 4.1 G 5.1 44°F 1025.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 36 mi66 min N 5.8 G 5.8 51°F 54°F10 ft1025.5 hPa (+0.3)
SFXC1 - San Francisco Bay Reserve, CA 37 mi71 min WNW 1 37°F 1025 hPa37°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi66 min NNW 7.8 G 12 53°F 55°F12 ft1025.2 hPa (+0.3)
PRYC1 - 9415020 - Point Reyes, CA 48 mi38 min Calm G 1.9 52°F1025.6 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA3 mi63 minENE 310.00 miFair38°F37°F100%1026.2 hPa
Hayward, Hayward Air Terminal, CA3 mi62 minE 310.00 miFair39°F34°F82%1026.9 hPa
San Francisco, San Francisco International Airport, CA11 mi60 minN 010.00 miFair44°F37°F79%1025.8 hPa
San Carlos Airport, CA11 mi61 minN 010.00 miFair39°F37°F93%1026.1 hPa
Mountain View, Moffett Field, CA18 mi60 minN 010.00 miFair39°F36°F89%1026.5 hPa
Livermore, Livermore Municipal Airport, CA19 mi63 minN 010.00 miFair34°F32°F92%1026.1 hPa
Half Moon Bay Airport, CA21 mi61 minN 010.00 miFair39°F37°F93%1025.1 hPa
Concord, Buchanan Field, CA22 mi63 minSSE 710.00 miFair41°F37°F86%1024.6 hPa

Wind History from OAK (wind in knots)
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Last 24hrCalmCalmCalmNE4CalmNW4NW7W8W8W6W5W6W6W8N3CalmNE3SE3E3CalmE3E3E3NE3
1 day agoCalmE3CalmNE3E3SE4S5W5W8NW9NW7NW9W12NW11NW10NW10NW5NW3N3N5N6N4N4Calm
2 days agoSE10SE6SE8SE7SE7S6SE6S5SW7W11W10W8W9W10W11W12W7W6W11W11W12W11W5Calm

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
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Roberts Landing
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Sun -- 03:35 AM PST     6.49 feet High Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 09:23 AM PST     2.75 feet Low Tide
Sun -- 10:03 AM PST     Moonrise
Sun -- 02:38 PM PST     6.49 feet High Tide
Sun -- 05:20 PM PST     Sunset
Sun -- 09:39 PM PST     0.50 feet Low Tide
Sun -- 09:56 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.94.45.66.46.45.9543.22.82.93.64.65.66.36.565.13.82.51.30.60.61.2

Tide / Current Tables for Mulford Gardens Channel #2 SSW, South San Francisco Bay, California Current
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Mulford Gardens Channel #2 SSW
Click for Map
Sun -- 03:18 AM PST     -0.00 knots Slack
Sun -- 05:53 AM PST     -0.52 knots Max Ebb
Sun -- 07:20 AM PST     Sunrise
Sun -- 08:47 AM PST     0.00 knots Slack
Sun -- 10:03 AM PST     Moonrise
Sun -- 11:55 AM PST     0.62 knots Max Flood
Sun -- 02:34 PM PST     -0.01 knots Slack
Sun -- 05:20 PM PST     Sunset
Sun -- 06:02 PM PST     -0.74 knots Max Ebb
Sun -- 09:07 PM PST     0.00 knots Slack
Sun -- 09:56 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.80.50.1-0.2-0.4-0.5-0.4-0.20.10.30.50.60.50.2-0.1-0.4-0.6-0.7-0.6-0.3-00.30.6

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 (7,2,3,4)
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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.