Friday, December14, 2018 L-36.com


Marine Weather and Tides
Alameda, 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 7:15AMSunset 4:52PM Friday December 14, 2018 8:55 PM PST (04:55 UTC) Moonrise 12:18PMMoonset 11:45PM Illumination 51% Phase: First Quarter Moon; Moon at 8 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 243 Pm Pst Fri Dec 14 2018
.small craft advisory in effect until 9 pm pst this evening...
Tonight..W winds 15 to 20 kt with gusts to 30 kt...becoming northeast 5 to 15 kt after midnight. Showers likely, mainly this evening.
Sat..E winds 5 to 15 kt. A chance of showers.
Sat night..SE winds 5 to 10 kt. A chance of showers.
Sun..SE winds 10 to 20 kt with gusts up to 30 kt. Rain.
Sun night..S winds 15 to 25 kt with gusts up to 30 kt. Rain.
Mon..N winds up to 10 kt.
Mon night..NW winds around 5 kt.
Tue..S winds around 5 kt.
Wed..NE winds around 5 kt.
PZZ500 243 Pm Pst Fri Dec 14 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A moderate west to northwest swell will build tonight and result in hazardous conditions through Saturday. Winds will become fairly light tonight as a weak frontal boundary stalls over the region. Southerly winds will increase late Saturday night into Sunday ahead of the next storm system to impact the region. A larger, more powerful long period west to northwest swell will build Sunday into Monday and result in hazardous conditions into early next week.


7 Day Forecast for Marine Location Near Alameda city, CA
   Hourly   EDIT   Help
location: 37.78, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 150023
afdmtr
area forecast discussion
national weather service san francisco bay area
423 pm pst Fri dec 14 2018

Synopsis A weak weather system will produce light rain across
the sf bay area into this evening. Scattered showers continue
Saturday across the north bay. A stronger wetter system impacts
the area Sunday. A very large wave train arrives late Sunday into
Monday. A return to dry weather is expected late Monday.

Discussion As of 03:00 pm pst Friday... A pair of storm systems
will bring unsettled weather to the region through the coming
days. The first of these two storm systems first arrived earlier
today bringing gusty southerly winds up to 50 mph over the higher
terrain and continues to encroach on the region from the
northwest this afternoon. A north to south line of light pre
frontal showers developed along the air mass boundary of the warm
sector earlier today, however, these high based showers promptly
fizzled upon moving over the santa cruz mountains and diablo
range bringing only spotty accumulations of a few hundredths. The
southern tail of the main frontal rain band is now moving across
the north bay, bringing reports of brief heavy at the santa rosa
airport. As of 215pm, precipitation accumulations have been
primarily confined to the sonoma coast and coastal range, with
just under half of an inch being reported near both monte rio and
gualala. Additional accumulations are anticipated through the
coming hours across the san francisco bay area.

Confidence is high that the surface frontal boundary will continue
to move towards san francisco and oakland over the remainder of
the daylight hours. From there, the surface frontal boundary will
stall out as the upper level support pulls away and lifts towards
idaho, leaving behind a stalled frontal boundary over the
northern san francisco bay and a moisture rich air mass overhead
of the broader region. The main precipitation band will rapidly
deteriorate through the evening and it is possible there will be a
few hours of little to no activity on the radar around midnight.

Short models then agree that a weak secondary pulse will pass over
the region late tonight into tomorrow morning, which will provide
just enough lift to kickstart the shower activity over the north
bay tomorrow.

A potent storm system is forecast to impact the forecast area
throughout Sunday with lingering showers into Sunday night and
early Monday. This storm system is accompanied by a fairly moist
air mass in the range of around 1.20-1.30" pwats and also has the
potential to tap into the additional lingering moisture orphaned
by tonights storm system. Thus, there is the potential for
moderate to locally heavy rainfall, primarily over the north bay
and isolated sections of the santa cruz and santa lucia ranges on
the order of up to 2.00-3.00". Elsewhere, widespread rain of 0.50
to 1.00" is expected to fall regionwide, with locally higher
amounts in the north bay valleys and locally lower amounts in the
typical rain shadowed portions of the santa clara and salinas
valley. Generally speaking, this should come as another round of
beneficial rain with only minor nuisance ponding of water and
nuisance flooding in prone paved low lying areas. In addition to
rain, southerly winds will become gusty ahead of the system,
especially along the coast and over the higher terrain.

In addition to the rain and wind, this storm system will be
responsible for bringing the largest waves so far this season to
the coast from late Sunday through Monday. A high surf warning has
been issued and is in effect from 9am Sunday through 9pm Monday.

The earlier start time accounts for the arrival of the very long
forerunner waves which present a significantly increased risk of
rip currents and sneaker waves. Please review the beaches section
for more information about the upcoming high surf event.

Aviation As of 4:15 pm pst Friday... A mix ofVFR-MVFR
conditions expected to continue as visibilities and cloud bases
remain lower in association with a weak frontal boundary
now essentially stalled over the sf bay area. Winds will continue
generally light and southerly, though locally a bit stronger and
gustier vicinity central portions of sf bay through early this
evening. Light rain and briefly lower ceilings are possible across
the san francisco bay area terminals through mid-evening.VFR
conditions are more likely to persist for the monterey bay
terminals as the frontal boundary remains stalled to the north.

Vicinity of ksfo...VFR conditions expected to generally prevail
through the evening rush, though ceilings and visibilities may
temporarily reduce to MVFR with a passing shower. Southerly
winds to 15 to 20 kt through the early evening hours, then light
out of the southeast. Moderate confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions to persist with mid level
cloud deck expected to continue over the region. Can't entirely rule
out the possibility of a passing shower, which could briefly
reduce ceilings and visibilities to MVFR. Moderate confidence.

Beaches As of 03:09 pm pst Friday... A potent storm system
passing south of aleutian islands will move nearly due east over
the coming days. This eastward trajectory will create a dynamic
fetch zone where the strongest winds of the storm system will
continuously increase the energy within a swell train on the
southern flank of the storm, resulting in a very large, long
period wnw wave train aimed at the california coast. Very long
period forerunners will arrive through the day Sunday and will
bring a significantly increased risk of rip currents and sneakers
waves to the coast. The largest waves are then forecast to arrive
Sunday night through Monday morning, with peak swells of 17 to 21
ft at 19 to 21 seconds currently expected. Large breaking waves of
25 to 40 ft will be possible at west and northwest facing
locations, with breakers up to or exceeding 50 ft at favored break
points along the coast. As a result, a high surf warning has been
issued from 9 am Sunday through 9 pm Monday along the entire
coastline.

Marine As of 03:09 pm pst Friday... A moderate west to
northwest swell will build tonight and result in hazardous
conditions through Saturday. Winds will become fairly light
tonight as a weak frontal boundary stalls over the region.

Southerly winds will increase late Saturday night into Sunday
ahead of the next storm system to impact the region. A larger,
more powerful long period west to northwest swell will build
Sunday into Monday and result in hazardous conditions into early
next week.

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
sca... Mry bay until 5 pm
sca... Sf bay until 9 pm
public forecast: drp
aviation: blier
marine beaches: rgass
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 1 mi55 min Calm G 1 57°F 1019.7 hPa (+0.4)
AAMC1 - 9414750 - Alameda, CA 1 mi61 min SE 1.9 G 4.1 57°F 55°F1020.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 3 mi61 min SSW 7 G 8
OBXC1 4 mi55 min 57°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 4 mi55 min SW 2.9 G 4.1 57°F 1019.8 hPa (+0.5)
PXSC1 6 mi61 min 59°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 6 mi55 min N 1 G 2.9 58°F 1018.6 hPa (+0.3)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 10 mi55 min N 1.9 G 2.9 56°F 1020.1 hPa (+0.5)
FTPC1 - 9414290 - San Francisco, CA 10 mi61 min W 2.9 G 2.9 55°F 56°F1020.1 hPa
RCMC1 - 9414863 - Richmond, CA 12 mi55 min 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi50 min Calm 55°F 1020 hPa
46237 - San Francisco Bar, CA (142) 19 mi55 min 56°F10 ft
MZXC1 - 9415102 - Martinez-Amorco CA 19 mi61 min W 11 G 13 56°F 54°F1019.1 hPa56°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi55 min W 7 G 9.9 55°F 1019.3 hPa (+0.4)
RTYC1 - 9414523 - Redwood City, CA 19 mi55 min S 4.1 G 6 59°F 55°F1019.9 hPa (-0.0)
PCOC1 - 9415144 - Port Chicago, CA 23 mi61 min SW 2.9 G 8.9 56°F 53°F1019.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi55 min NNE 2.9 G 4.1 56°F 1019 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi45 min NNE 3.9 G 5.8 54°F 1020.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 32 mi70 min WNW 4.1 54°F 1019 hPa50°F
PRYC1 - 9415020 - Point Reyes, CA 40 mi61 min 56°F1020 hPa

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
9
PM
10
PM
11
PM
12
AM
-12
PM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last
24hr
E2
N2
N1
N5
N4
SW1
NW2
SE3
E2
E1
SW3
SE4
G9
S11
G18
S13
G17
S10
G15
S13
G16
S12
SW12
G16
S10
S5
G8
SW9
SW6
SE2
1 day
ago
E4
E5
G8
E5
E4
E2
E2
N2
N6
G9
N4
G8
N2
NW3
E2
N2
G5
W6
SW2
W2
N3
SW2
S3
--
E5
E1
E2
E1
2 days
ago
E2
E3
G6
E3
E3
E4
E4
E6
E4
G7
SE5
E2
N3
SE3
N6
G11
SE3
G7
N1
SW4
W6
W7
W5
SW2
W1
NW1
SE2
E2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA6 mi62 minN 010.00 miOvercast57°F52°F83%1019.9 hPa
Hayward, Hayward Air Terminal, CA12 mi61 minW 410.00 miOvercast57°F48°F74%1020.6 hPa
San Francisco, San Francisco International Airport, CA12 mi59 minSSW 1010.00 miOvercast58°F48°F72%1019.4 hPa
San Carlos Airport, CA17 mi68 minN 010.00 miOvercast59°F50°F72%1019.6 hPa
Concord, Buchanan Field, CA18 mi62 minE 410.00 miOvercast57°F50°F78%1017.9 hPa
Half Moon Bay Airport, CA22 mi60 minSE 79.00 miOvercast55°F51°F88%1020 hPa
Palo Alto Airport, CA22 mi68 minVar 410.00 miMostly Cloudy57°F50°F77%1020 hPa

Wind History from OAK (wind in knots)
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last 24hrE9E5CalmNW3CalmN3CalmCalmE8CalmCalmSE5SE10W6S7S18S13S8SW14S13S8SW10SW4Calm
1 day agoSE7E6E4SE6E4NE3CalmNW4NE4CalmW4E4CalmSW4W5NE12E8S7SW4NW3E7NE8E7E7
2 days agoSE4NE3E4E3E3SE7SE6SE6SE5E5CalmN8N8NE9NE12NE7W8W9NW9W5W7W4E4SE7

Tide / Current Tables for Oakland Inner Harbor, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Oakland Inner Harbor
Click for Map
Fri -- 05:51 AM PST     5.39 feet High Tide
Fri -- 07:16 AM PST     Sunrise
Fri -- 11:41 AM PST     2.93 feet Low Tide
Fri -- 12:17 PM PST     Moonrise
Fri -- 04:36 PM PST     4.72 feet High Tide
Fri -- 04:50 PM PST     Sunset
Fri -- 11:12 PM PST     0.88 feet Low Tide
Fri -- 11:45 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.11.92.93.94.75.25.45.14.63.93.432.93.23.74.24.64.74.43.72.81.91.20.9

Tide / Current Tables for Oakland Inner Harbor Reach, 33 ft. below datum Current
   EDIT      (on/off)   Help   One Week of Data
Oakland Inner Harbor Reach
Click for MapFlood direction 82 true
Ebb direction 255 true

Fri -- 02:35 AM PST     0.27 knots Max Flood
Fri -- 05:39 AM PST     -0.00 knots Slack
Fri -- 07:16 AM PST     Sunrise
Fri -- 07:30 AM PST     -0.21 knots Max Ebb
Fri -- 10:30 AM PST     0.00 knots Slack
Fri -- 12:17 PM PST     Moonrise
Fri -- 02:40 PM PST     0.14 knots Max Flood
Fri -- 04:50 PM PST     Sunset
Fri -- 04:58 PM PST     -0.00 knots Slack
Fri -- 07:34 PM PST     -0.30 knots Max Ebb
Fri -- 10:26 PM PST     0.00 knots Slack
Fri -- 11:45 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.20.20.30.30.20.1-0.1-0.2-0.2-0.1-0.100.10.10.10.10.1-0-0.2-0.3-0.3-0.2-0.10

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.