Friday, August23, 2019 L-36.com


Marine Weather and Tides
San Lorenzo, CA

Version 3.4
NOTICE
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 6:29AMSunset 7:52PM Friday August 23, 2019 5:21 PM PDT (00:21 UTC) Moonrise 11:32PMMoonset 1:05PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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- 225 Pm Pdt Fri Aug 23 2019
.small craft advisory in effect until 9 pm pdt this evening...
.small craft advisory in effect from Saturday afternoon through Saturday evening...
Tonight..SW winds 15 to 25 kt with gusts to 30 kt, diminishing to 5 to 10 kt overnight.
Sat..SW winds 5 to 10 kt, increasing to 15 to 25 kt with gusts to 30 kt in the afternoon.
Sat night..SW winds 15 to 25 kt with gusts to 30 kt, diminishing to 5 to 10 kt overnight.
Sun..SW winds 5 to 10 kt, increasing to 15 to 25 kt in the afternoon.
Sun night..SW winds 15 to 25 kt, diminishing to 5 to 10 kt overnight.
Mon..SW winds 5 to 10 kt, increasing to 15 to 25 kt in the afternoon.
Mon night..SW winds 10 to 20 kt, diminishing to 5 to 10 kt overnight.
Tue..SW winds 10 to 15 kt.
Wed..SW winds 10 to 15 kt.
PZZ500 225 Pm Pdt Fri Aug 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will continue to diminish across the coastal waters through tonight with strongest winds remaining over the northern outer waters. Steep, short period northwesterly swells will also diminish tonight and through the weekend with period becoming 7 to 8 seconds. Southwesterly winds are forecast over the near shore coastal waters this weekend. A moderate southerly swell will arrive on Sunday and persist through early next week with light northwesterly swell continuing through the period.


7 Day Forecast for Marine Location Near San Lorenzo, CA
   Hourly   EDIT   Help
location: 37.65, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 232025
afdmtr
area forecast discussion
national weather service san francisco bay area
125 pm pdt Fri aug 23 2019

Synopsis A shallow marine layer along the coast with onshore
winds will bring seasonable temperatures to the bay area today.

High pressure begins to strengthen and rebuild over the state this
weekend allowing for inland areas to warm back into the 90s.

Milder conditions will persist near the coast with a shallow
marine layer. The ridge will weaken slightly by Tuesday and
Wednesday as the remnants of tropical storm ivo pass west of the
golden gate. This may bring some increasing clouds and more
humidity to the region.

Discussion As of 1:25 pm pdt Friday... This morning's low
clouds that blanketed coastal portions of the san francisco bay
area and much of the monterey bay area continue to mix-out this
afternoon. With the exception of some stubborn low clouds
lingering around monterey, half moon bay, and around the golden
gate, much of the population across the region can expect mostly
clear skies through the rest of the afternoon. Forecast highs this
afternoon will reach the 60s to 70s along the coast with interior
locations warming to the 80s and 90s, generally falling within
several degrees of late august climatological normals.

Upper level ridge is forecast to build over the next several days,
allowing for a gradual warming trend through the weekend and into
next week for interior locations. High temperatures by Sunday and
Monday will reach the upper 80s to middle 90s for the north bay
mountains and valleys, interior east bay, south bay, as well as
interior monterey and san benito counties. Overall, heat risk for
inland areas will be low to locally moderate, mainly impacting
those sensitive to the heat. Coastal communities can expect to
see continued onshore flow that will keep temperatures in check.

Additionally, the ridge is expected to keep the marine layer
rather shallow, so morning low cloud potential will generally be
limited to the immediate coast and exposed coastal valleys.

Tropical storm ivo, presently positioned several hundred miles sw
of the tip of the baja peninsula, is forecast to move north over
the next several days and weaken as it encounters cooler waters.

Remnant mid high level moisture is expected to advect north to
the golden state by the early to middle part of next week, though
there remains plenty of uncertainty as to the track. The latest
run of the ECMWF tracks the bulk of the remnant moisture in the
700-500 mb layer offshore. The GFS brings the moisture a bit
closer to our area with increased rhs values as far east as the
sierra. Will have to continue to keep a close eye on the track of
this remnant moisture as this could introduce the possibility of
some isolated thunderstorms for higher elevations in parts of the
state. At a minimum, much of the region can expect increased
mid high clouds, as well as an increase in surface dewpoints with
southerly flow.

Aviation As of 10:56 am pdt Friday... Low clouds are quickly
clearing to the coast as a southerly surge of stratus makes a run
northward. Anticipate a return of stratus this evening and tonight
to coastal terminals as the onshore gradient increases. Confidence
is low as to the extent of the stratus intrusion overnight as the
marine layer is expected to remain shallow. Therefore have limited
cigs to mainly coastal terminals. Light onshore winds will ramp
up this afternoon to around 10 to 15 kt.

Vicinity of ksfo...VFR conditions will prevail with ifr MVFR cigs
likely to return after midnight tonight. Low confidence. Light
winds this morning becoming westerly around 15kt after 21z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS over kmry will scatter out
between 19z and 20z this afternoon with an early return expected
between 03z-05z this evening. Light winds this morning becoming
westerly 5 to 10kt this afternoon.

Marine As of 9:00 am pdt Friday... Northwest winds will
decrease across the area today but remain breezy over the northern
outer waters. Steep northwesterly swell at 8 to 10 seconds will
decrease today through the weekend with period becoming 7 to 8
seconds. Southwesterly winds are forecast over the near shore
coastal waters this weekend. A moderate southerly swell will
arrive on Sunday and persist through early next week with light
northwesterly swell continuing through the period.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay
public forecast: rowe
aviation: cw
marine: cw
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
AAMC1 - 9414750 - Alameda, CA 9 mi58 min W 13 G 17 65°F 73°F1010.2 hPa
RTYC1 - 9414523 - Redwood City, CA 10 mi52 min NW 15 G 17 71°F 76°F1009.4 hPa
LNDC1 11 mi52 min WNW 7 G 12 66°F 1009.9 hPa
OBXC1 12 mi52 min 64°F 62°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi58 min W 12 G 15
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi52 min W 13 G 24 63°F 1009.8 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi52 min WSW 13 G 22 63°F 1008.6 hPa
PXSC1 14 mi52 min 65°F 59°F
FTPC1 - 9414290 - San Francisco, CA 17 mi58 min WSW 12 G 22 61°F 62°F1010.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi52 min SW 11 G 15 64°F 1010.2 hPa
RCMC1 - 9414863 - Richmond, CA 21 mi58 min SW 9.9 G 16 64°F 68°F1009.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi47 min W 18 63°F 1009 hPa
46237 - San Francisco Bar, CA (142) 24 mi52 min 61°F5 ft
UPBC1 27 mi52 min W 18 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 27 mi58 min WSW 13 G 16 76°F 74°F1007.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi52 min SW 17 G 21 69°F 1008 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi52 min W 14 G 18 78°F 72°F1007.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi58 min NW 15 G 19 80°F 1006.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi42 min SSW 5.8 G 7.8 60°F 59°F1011.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 39 mi97 min W 15 82°F 1007 hPa61°F
PRYC1 - 9415020 - Point Reyes, CA 47 mi52 min 52°F1010.4 hPa

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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
24hr
W9
G12
W9
W4
W9
G12
W7
W8
W6
G9
SW4
W2
W4
W4
W5
G8
W6
W8
W4
W3
W4
NW4
G7
NW3
G6
NW5
G9
W8
W11
G14
W10
G14
W15
G20
1 day
ago
W8
G13
W8
G12
W8
W8
G11
S1
W6
G9
SW3
G6
W5
SW3
W3
W5
S2
SW7
SW6
SW4
W4
SW3
SW2
W4
W4
W8
W8
G11
W11
G14
W9
G12
2 days
ago
W11
G15
W8
G13
W11
G15
W8
G11
W7
G11
SW4
W2
SW8
G11
SW9
SW7
G10
SW9
SW8
SW8
G11
E2
SW2
SE3
SE5
SE4
S2
SW2
W4
G7
SW5
W6
W6
G9

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, CA3 mi29 minNW 16 G 2110.00 miA Few Clouds71°F57°F63%1009.6 hPa
Hayward, Hayward Air Terminal, CA5 mi28 minNW 1510.00 miFair75°F59°F58%1009.8 hPa
San Carlos Airport, CA8 mi35 minno data10.00 miClear75°F57°F54%1008.8 hPa
San Francisco, San Francisco International Airport, CA8 mi86 minNNE 610.00 miA Few Clouds78°F60°F54%1008.5 hPa
Palo Alto Airport, CA13 mi35 minNNW 1510.00 miClear75°F62°F65%1008.5 hPa
Mountain View, Moffett Field, CA18 mi86 minNNW 1110.00 miFair80°F62°F54%1008.5 hPa
Half Moon Bay Airport, CA18 mi27 minS 9 G 159.00 miOvercast61°F57°F88%1011.5 hPa
Livermore, Livermore Municipal Airport, CA21 mi29 minWNW 1410.00 miFair87°F60°F40%1007 hPa

Link to 5 minute data for KOAK

Wind History from OAK (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 24hrW15W15NW10NW12NW9NW8N4N3N3CalmCalmNW3NW4NW5NW75W7W7W7N10NW13NW14NW14NW16
G21
1 day agoW12W13W10W8NW4CalmSW5NW3W4W7W9W6SW5W4CalmCalmS4SW3W6W9W12W13W17NW15
2 days agoW17W17W14W12W11W5CalmCalmSW9W5NE3NE5N3S7W4SW6S4SW3SW5W6W9W9W10W11

Tide / Current Tables for San Mateo Bridge (east end), San Francisco Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
San Mateo Bridge (east end)
Click for Map
Fri -- 01:01 AM PDT     1.46 feet Low Tide
Fri -- 06:31 AM PDT     Sunrise
Fri -- 07:10 AM PDT     5.61 feet High Tide
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 12:30 PM PDT     2.63 feet Low Tide
Fri -- 02:05 PM PDT     Moonset
Fri -- 06:38 PM PDT     7.35 feet High Tide
Fri -- 07:50 PM PDT     Sunset
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
1.71.51.82.53.54.55.35.65.44.843.22.72.73.24.25.36.47.27.36.95.94.63.3

Tide / Current Tables for Little Coyote Pt 3.4 mi NNE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Little Coyote Pt 3.4 mi NNE
Click for Map
Fri -- 12:45 AM PDT     0.00 knots Slack
Fri -- 03:32 AM PDT     0.40 knots Max Flood
Fri -- 06:31 AM PDT     Sunrise
Fri -- 06:52 AM PDT     -0.00 knots Slack
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 09:34 AM PDT     -0.37 knots Max Ebb
Fri -- 12:09 PM PDT     0.00 knots Slack
Fri -- 02:05 PM PDT     Moonset
Fri -- 03:28 PM PDT     0.38 knots Max Flood
Fri -- 06:21 PM PDT     -0.00 knots Slack
Fri -- 07:50 PM PDT     Sunset
Fri -- 10:05 PM PDT     -0.68 knots Max Ebb
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
-0.20.10.20.40.40.30.2-0-0.2-0.4-0.4-0.2-00.10.30.40.40.20.1-0.1-0.4-0.6-0.7-0.6

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 (20,4,5,8)
      (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.