Sunday, September15, 2019 L-36.com


Marine Weather and Tides
Belvedere, CA

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:50AMSunset 7:19PM Sunday September 15, 2019 8:23 PM PDT (03:23 UTC) Moonrise 7:29PMMoonset 7:06AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 245 Pm Pdt Sun Sep 15 2019
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 10 to 20 kt with gusts up to 30 kt, becoming sw 5 to 10 kt after midnight. A slight chance of rain after midnight.
Mon..W winds 10 to 20 kt with gusts up to 25 kt. A chance of rain.
Mon night..W winds 5 to 15 kt.
Tue..W winds 5 to 15 kt.
Tue night..W winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt.
Wed night..W winds 5 to 15 kt.
Thu..W winds 10 to 20 kt with gusts up to 25 kt.
Fri..W winds 10 to 20 kt.
PZZ500 245 Pm Pdt Sun Sep 15 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect locally breezy afternoon and evening winds along the inner coastal waters south of pigeon point and over the bays. Winds will ease early this week as high pressure over the eastern pacific weakens. A cold front will move through the waters on Monday bringing a chance of showers. Mixed seas will continue with moderate period northwest swell and a slightly longer period southerly swell.


7 Day Forecast for Marine Location Near Belvedere, CA
   Hourly   EDIT   Help
location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 152323
afdmtr
area forecast discussion
national weather service san francisco bay area
419 pm pdt Sun sep 15 2019

Synopsis The cooling trend that began in coastal areas on
Saturday will spread inland today and Monday as a weather system
moves in from the northwest. There is also a chance of light rain
on Monday, mainly across the northern half of the area. A second
weather system may bring renewed rain chances around the middle of
next week, and also keep temperatures on the cool side of normal
through much of the week.

Discussion As of 2:23 pm pdt Sunday... Noticeably cooler
conditions have finally arrived to the interior areas of the san
francisco bay area this afternoon. Yesterday the relief from the
heat was only realized along the immediate coast, but as the
marine layer ballooned to around 1,500 ft deep along with the
increased onshore flow (surface pressure gradient +3.3 mb from
sfo-sac today vs +1.2 mb yesterday), the pacific-cooled air has
managed to spread inland and drop interior temperatures by 10 to
20 degrees. As of the 2 pm hour, livermore was running 18 degrees
cooler than this time yesterday, 14 degrees cooler at concord, and
13 degrees at santa rosa. Bay area-wide, Sunday's high
temperatures will register about 2 to 8 degrees below middle
september climatological normals.

Over the next 24 hours, a frontal system associated with a low in
the pacific northwest will push southeastward into northern and
central california. This will bring the first decent shot of
measurable rainfall of the season to the san francisco bay area.

As we'll be on the far southern extent of this system, rain totals
are expected to be on the light side, with most locations
forecast to receive less than a tenth of an inch. The 18z hrrr
that GOES out through 06z Tuesday actually keeps much of the bay
area dry with just a few areas of measurable rain in the hills.

The mid long range models can be a bit bullish with their handling
of these early season systems; therefore, a drier outcome
wouldn't at all be surprising with climatology prevailing.

Seasonably cool conditions will persist through much of the week
as a reinforcing shot of cooler air will arrive with another
system that will drop south from the pacific northwest around
Wednesday. Right now the best chance for rain with this system
will stay north of the golden gate. Should note that the forecast
track of this upper low has pushed a bit more to the east over the
past few ECMWF and GFS model runs. The latest ECMWF does indicate
some north to northeast winds at the 925 and 850 mb levels for
the north and east bay mountains overnight Wednesday and into
Thursday that will be worth monitoring, particularly if rain
chances are minimal.

Temperatures will begin to moderate on Friday and into next
weekend as upper level heights rebound.

Aviation As of 4:19 pm pdt Sunday... It'sVFR at the terminals,
however just beginning to see a few stratus and fog patches already
along coastal marin and san mateo counties. Surface to lower level
cooling, a deepening marine layer interacting with increasing water
vapor advancing from the west brings low clouds MVFR ceilings
inland with late afternoon and evening sea breezes.

Convergence along a cold front to the NW sweeps southward over the
cwa Monday morning with an amplifying 500 mb trough enhancing upward
vertical motion. The 00z bay area tafs advertise wet weather with
light to moderate rain Monday morning quickly turning to vicinity
showers before drier air returns in the afternoon. Patchy drizzle
could develop in lowering ceilings to the south, with very light
rain to light rain band possible far south Monday morning. Ceilings
MVFR tonight and Monday morning except local to areas ifr ceilings
over the north bay counties and local ifr overnight southward along
the coast.

Vicinity of ksfo... Gusty west wind to 25 knots andVFR until mid
evening. MVFR tonight with light rain arriving by 10z then moderate
rain 13z-18z. Stratus redeveloping in the evening as ongoing cooling
and forcing lifting along coastal terrain and alignment of surface
to lower level west winds bring an inland intrusion of stratus
tonight. Frontal passage occurs Monday morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR this afternoon then increasing stratus
clouds developing in the early to mid evening. MVFR-ifr ceilings
tonight and Monday morning, patchy drizzle possible tonight. Very
light to light rain arriving late morning and afternoon.

Marine As of 3:43 pm pdt Sunday... Expect locally breezy
afternoon and evening winds along the inner coastal waters south
of pigeon point and over the bays. Winds will ease early this week
as high pressure over the eastern pacific weakens. A cold front
will move through the waters on Monday bringing a chance of
showers. Mixed seas will continue with moderate period northwest
swell and a slightly longer period southerly swell.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 3 am
public forecast: rowe
aviation marine: canepa
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
FTPC1 - 9414290 - San Francisco, CA 2 mi53 min SW 8.9 G 12 61°F1011.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi59 min WSW 6 G 13 64°F 1010.1 hPa
PXSC1 3 mi53 min 65°F 64°F
OBXC1 6 mi53 min 65°F 65°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi53 min W 11 G 18 65°F 1011 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi53 min WSW 16 G 19
RCMC1 - 9414863 - Richmond, CA 7 mi53 min SSW 4.1 G 8 64°F1010.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi59 min SSW 8 G 11 66°F 1011.1 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi53 min W 11 G 16 70°F1011.7 hPa
LNDC1 9 mi53 min W 7 G 13 66°F 1011.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi53 min 59°F3 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi59 min W 11 G 16 69°F 1009.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi33 min W 5.8 G 7.8 60°F 59°F3 ft1012 hPa
UPBC1 22 mi59 min W 14 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi53 min SW 9.9 G 15 69°F 71°F1010.1 hPa68°F
RTYC1 - 9414523 - Redwood City, CA 25 mi53 min WSW 8.9 G 13 67°F 74°F1012.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi53 min SW 7 G 12 68°F 72°F1009.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi53 min 57°F1011.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi53 min W 7 G 12 71°F 1009.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi98 min W 15 70°F 1009 hPa60°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
8
PM
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
Last
24hr
SW5
G12
SW7
G11
SW7
G13
SW3
G6
SW8
G14
SW6
G9
SW6
G11
SW3
G6
S1
S2
SW7
G15
W8
G16
SW9
G13
W5
G10
S4
G12
SW12
G19
SW11
G17
SW13
G20
SW10
G14
SW7
G14
W11
G19
SW13
G18
W8
G15
SW9
G13
1 day
ago
SW16
G21
SW6
G9
SW3
W1
W3
W2
W3
W3
SW1
W2
G5
W5
SW6
SW8
G11
SW7
G13
W7
G11
W5
G12
W6
G11
W6
G13
SW13
G21
W13
G18
SW16
G24
SW17
G24
SW15
G22
SW12
G17
2 days
ago
W1
G4
SW2
NW4
NW2
W1
--
SE1
S2
S2
S1
SE3
S3
NE2
E2
E5
E5
NE5
N2
NE1
SW8
G12
W11
G15
SW15
W12
G16
SW15
G19

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi30 minW 1510.00 miOvercast68°F62°F81%1011.3 hPa
San Francisco, San Francisco International Airport, CA15 mi87 minW 1410.00 miMostly Cloudy67°F61°F81%1011.2 hPa
Hayward, Hayward Air Terminal, CA21 mi29 minW 13 G 1910.00 miMostly Cloudy67°F62°F84%1012.3 hPa
Half Moon Bay Airport, CA22 mi28 minN 09.00 miOvercast63°F60°F94%1012.2 hPa
Concord, Buchanan Field, CA23 mi30 minSSW 1110.00 miFair69°F57°F66%1008.8 hPa
San Carlos Airport, CA23 mi95 minWSW 510.00 miMostly Cloudy66°F59°F78%1011.8 hPa
Novato / Gnoss Field, CA23 mi48 minWSW 19 G 3010.00 miFair and Breezy68°F62°F83%1009.5 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
6
PM
7
PM
8
PM
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
Last 24hrW22--------------------W5----W11SW6--W14W16
G23
W14
G21
W16
G22
W19
G26
W18
G25
W17
G21
1 day agoW19----NW10----W7------W7----W7--W9W11NW12--NW17W20W19W23W20
G25
2 days agoW17------------------W3CalmCalmCalmCalmCalmNE5N4NE5N3N5N5W11W15

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Alcatraz Island
Click for Map
Sun -- 12:55 AM PDT     5.49 feet High Tide
Sun -- 06:51 AM PDT     Sunrise
Sun -- 07:02 AM PDT     0.81 feet Low Tide
Sun -- 08:06 AM PDT     Moonset
Sun -- 01:36 PM PDT     5.31 feet High Tide
Sun -- 07:17 PM PDT     Sunset
Sun -- 07:21 PM PDT     1.53 feet Low Tide
Sun -- 08:28 PM PDT     Moonrise
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
5.35.55.24.33.121.10.81.11.82.73.84.75.25.34.83.92.921.61.62.233.9

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Alcatraz Island W
Click for Map
Sun -- 02:32 AM PDT     -0.00 knots Slack
Sun -- 05:19 AM PDT     -2.32 knots Max Ebb
Sun -- 06:51 AM PDT     Sunrise
Sun -- 08:06 AM PDT     Moonset
Sun -- 08:44 AM PDT     0.01 knots Slack
Sun -- 11:39 AM PDT     2.56 knots Max Flood
Sun -- 03:03 PM PDT     -0.01 knots Slack
Sun -- 05:39 PM PDT     -2.09 knots Max Ebb
Sun -- 07:17 PM PDT     Sunset
Sun -- 08:28 PM PDT     Moonrise
Sun -- 08:55 PM PDT     0.00 knots Slack
Sun -- 11:51 PM PDT     2.43 knots Max Flood
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
2.31.70.7-0.5-1.7-2.3-2.2-1.6-0.80.31.62.42.52.11.30.1-1.1-1.9-2-1.6-0.80.11.32.2

Weather Map
       (on/off)   Help Weather Map
wmap_P
GEOS 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.