Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Belvedere, CA

Version 3.4
What's New / NOTES
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 5:47AMSunset 8:37PM Saturday June 24, 2017 3:24 AM PDT (10:24 UTC) Moonrise 5:37AMMoonset 8:17PM Illumination 0% Phase: New Moon; Moon at 0 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 San Francisco Bay North Of The Bay Bridge- 854 Pm Pdt Fri Jun 23 2017
.small craft advisory in effect until 11 pm pdt this evening...
.small craft advisory in effect from Saturday afternoon through Saturday evening...
Tonight..SW winds 15 to 25 kt...decreasing to 10 to 20 kt by midnight. Patchy fog after midnight.
Sat..SW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon. Patchy fog in the morning.
Sat night..SW winds 15 to 25 kt...decreasing to 10 to 20 kt.
Sun..SW winds 15 to 25 kt.
Sun night..SW winds 15 to 25 kt.
Mon..SW winds 10 to 20 kt.
Tue..SW winds 10 to 20 kt.
Wed..SW winds 10 to 20 kt.
PZZ500 854 Pm Pdt Fri Jun 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An upper level weather disturbance off the southern california coast will move north tonight, potentially producing isolated Thunderstorms over the southern coastal waters late tonight and Saturday. Otherwise, light southerly winds will continue over the coastal waters tonight before turning westerly and northwesterly and increasing slightly by Saturday afternoon. Wave heights and swell will decrease through the coming days.

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 240540
afdmtr
area forecast discussion
national weather service san francisco bay area
1040 pm pdt Fri jun 23 2017

Synopsis Cooling trend started today for most areas as onshore
flow returns. The far interior valleys will remain seasonably
warm through this evening. The overall trend this weekend and into
next week will be a return to more seasonable temperatures along
with more extensive night and morning low clouds followed by sunny
afternoons.

Discussion As of 8:40 pm pdt Friday... Temperatures cooled
considerably over the last 24 hours as the marine layer gradually
deepened and onshore flow returned. Most locations cooled anywhere
from 5 to 15 degrees with a couple locations dropping as much as
20 degrees from yesterday. High temperatures topped out in the mid
60s to low 70s along the coast, mid 70s to low 80s around the bay
and mid 80s to low 90s over the interior. A few locations managed
to soar into the 100 to 108 range over the warmest southern
interior valleys of monterey and san benito counties. Temperatures
have cooled since this afternoon and with the trend toward cooler
temperatures for Saturday the heat advisory for the interior
portions of the east bay, santa clara county and the mountain of
monterey and san benito counties will be allowed to expire at 9 pm
tonight.

The cooling trend will continue through the next few days with
temperatures falling on average 3 to 5 degrees each day through
the weekend and into early next week. Coastal areas will see
little change while inland temperatures will see larger changes as
cooler marine air reaches farther inland. No heat advisories are
anticipated through the weekend.

Low clouds and patchy fog will also return to the region this
weekend as an approaching upper level trough deepens the marine
layer. Patchy drizzle will also be likely by Monday as the trough
axis moves across the district.

From previous discussion... One major change to the forecast was
to include a slight chance of thunderstorms over monterey san
benito late tonight into Saturday. Confidence is rather low, but
if it verifies impacts could be huge, especially from a fire
weather perspective. For several days now, models have been keying
in on the moisture convection near baja tracking north. Latest
models do bring the mid-upper level moisture (700-500mb) northward
tonight and early Saturday. In addition to the moisture
advection, upper level instability increases. Mu CAPE through the
layer increases with modified total totals greater than 30 all
indicating upper level lift. At this point only giving it a 15 pct
chance of occurring, but still wanted to add it to the forecast.

Medium and longer range models still indicate later next week and
towards the end of the month show more pronounced ridging with
potential for another round of weak offshore flow and associated
warming. CPC has the 6-10 forecast above normal temps for ca.

Aviation As of 10:40 pm pdt Friday... For 06z tafs. Widespread
ifr ceilings will develop overnight and continue into Saturday
morning. Local lifr ceilings and ifr vsbys are also likely.

Vfr conditions expected to return to most terminals by 18z
Saturday. A weak upper level disturbance approaching from the
south late tonight and Saturday morning will produce some mid high
level clouds and may also trigger isolated thunderstorms near the
coast. Look for similar return time for low clouds on Saturday
evening, possibly a few hours earlier.

Forecast confidence: moderate
vicinity of ksfo...VFR conditions expected to persist at ksfo
until about 10z, with ifr ceilings then forecast from about 10-17z.

Westerly winds increasing to around 20 knots on Saturday
afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr lifr ceilings overnight and into
early Saturday along with patchy MVFR vsbys. Low clouds expected
to clear by 17z Saturday at ksns but probably a couple of hours
later at kmry. Mid level clouds late tonight and Saturday with a
potential for isolated thunderstorms, but thunderstorm potential
is highest offshore.

Marine As of 8:54 pm pdt Friday... An upper level weather
disturbance off the southern california coast will move north
tonight, potentially producing isolated thunderstorms over the
southern coastal waters late tonight and Saturday. Otherwise,
light southerly winds will continue over the coastal waters
tonight before turning westerly and northwesterly and increasing
slightly by Saturday afternoon. Wave heights and swell will
decrease through the coming days.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 11 pm
public forecast: cw
aviation: dykema
marine: dykema
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 mi55 min WNW 1.9 G 7 56°F 56°F1014.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi61 min W 6 G 9.9 57°F 1013.1 hPa
PXSC1 3 mi55 min 58°F 57°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi58 min SSW 6 56°F 1014 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi55 min W 7 G 9.9 58°F 1014 hPa
OBXC1 6 mi55 min 58°F 57°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi55 min WSW 8 G 9.9
RCMC1 - 9414863 - Richmond, CA 7 mi55 min SSW 2.9 G 7 58°F 62°F1013.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi55 min SW 4.1 G 5.1 59°F 1014.1 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi55 min W 5.1 G 7 58°F 65°F1014.5 hPa
LNDC1 9 mi61 min W 6 G 8.9 58°F 1014.1 hPa
46237 - San Francisco Bar, CA (142) 11 mi55 min 56°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi55 min WSW 9.9 G 13 60°F 1013.2 hPa
UPBC1 22 mi55 min W 18 G 21
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi95 min W 1.9 G 3.9 56°F 56°F4 ft1014.5 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi55 min W 13 G 17 59°F 68°F1013.4 hPa59°F
RTYC1 - 9414523 - Redwood City, CA 25 mi55 min NW 6 G 7 61°F 75°F1013.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi55 min WSW 18 G 23 59°F 72°F1012.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi55 min NW 1.9 G 2.9 58°F 60°F1013.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi55 min WNW 20 G 26 62°F 1010.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi100 min W 14 60°F 1011 hPa56°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi95 min WSW 1.9 G 3.9 56°F 55°F6 ft1014 hPa (+0.0)

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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
-12
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
Last
24hr
SW3
G7
NW3
G8
SW6
G11
W9
G14
SW6
G11
W5
G12
W5
G14
W7
G12
W5
G13
W6
G15
W3
G9
W10
G20
SW10
G19
W5
G11
SW4
G9
W6
G11
W7
G17
W3
G7
SW3
G10
SW4
G7
SW2
G8
SW2
G10
W1
G8
1 day
ago
SW4
G9
SW6
G11
W7
G11
W3
G11
W9
G12
SW9
G16
W4
G11
SW3
G10
SW9
G17
W11
G17
SW11
G16
W10
G19
W14
G23
SW14
G20
SW16
G22
SW11
G17
W7
G14
SW10
G17
SW6
G13
SW5
G8
W4
G10
SW3
G9
SE1
G5
2 days
ago
SW7
SW8
G11
SW6
G12
SW8
G11
W7
G11
W6
G13
W8
G14
W4
G11
SW7
G13
SW11
G18
SW7
G14
W11
G18
W10
G17
W5
G13
W5
G10
S2
G8
E3
SW5
W3
G9
SW3
G8
W3
G6
SW4
G9
SW5
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi29 minWNW 810.00 miMostly Cloudy58°F54°F87%1013.6 hPa
Oakland, Metro Oakland International Airport, CA15 mi32 minWNW 810.00 miOvercast61°F57°F87%1013.8 hPa
Hayward, Hayward Air Terminal, CA21 mi31 minNNW 610.00 miOvercast60°F53°F78%1014.6 hPa
Novato / Gnoss Field, CA23 mi30 minNW 410.00 miMostly Cloudy55°F53°F94%1013.9 hPa
San Carlos Airport, CA23 mi30 minN 010.00 miOvercast61°F57°F88%1013.9 hPa
Concord, Buchanan Field, CA23 mi32 minW 610.00 miFair61°F55°F81%1011.4 hPa

Wind History from SFO (wind in knots)
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
12
AM
1
AM
2
AM
3
AM
Last 24hrW3W4NW4CalmNE3NE3NE6N9N8N8NW14NW20W20W19W21W18W19
G23
W15W12W12W11NW9W10W8
1 day agoW5W9NW5CalmNW3N4N5NE5N7NW11NW15W16W17NW18NW14NW18W17W15W11W11W7W5NW4W5
2 days agoNW9W8W5NW4NW5N4NE7NE6NE6N7NW15NW16NW16NW18NW14NW14W14W10W8W10W10W7NW6W5

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Alcatraz Island
Click for Map
Sat -- 05:48 AM PDT     Sunrise
Sat -- 06:36 AM PDT     Moonrise
Sat -- 06:38 AM PDT     -1.73 feet Low Tide
Sat -- 01:47 PM PDT     5.10 feet High Tide
Sat -- 06:28 PM PDT     2.29 feet Low Tide
Sat -- 08:35 PM PDT     Sunset
Sat -- 09:17 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
76.453.11-0.6-1.6-1.7-1.1-01.32.844.95.14.63.82.92.42.433.95.16.1

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
Sat -- 01:16 AM PDT     -0.00 knots Slack
Sat -- 04:33 AM PDT     -3.69 knots Max Ebb
Sat -- 05:48 AM PDT     Sunrise
Sat -- 06:36 AM PDT     Moonrise
Sat -- 08:08 AM PDT     0.00 knots Slack
Sat -- 11:17 AM PDT     3.89 knots Max Flood
Sat -- 02:58 PM PDT     -0.01 knots Slack
Sat -- 05:11 PM PDT     -1.83 knots Max Ebb
Sat -- 08:01 PM PDT     0.00 knots Slack
Sat -- 08:35 PM PDT     Sunset
Sat -- 09:17 PM PDT     Moonset
Sat -- 10:59 PM PDT     2.82 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.80.5-1.1-2.6-3.6-3.6-2.9-1.7-0.21.73.23.93.731.6-0.1-1.3-1.8-1.6-1-01.32.42.8

Weather Map and Satellite Images
       (on/off)   Help
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 (6,6,7,8)
      (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.