Monday, August19, 2019 L-36.com


Marine Weather and Tides
South San Francisco, 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 6:27AMSunset 7:58PM Monday August 19, 2019 1:23 PM PDT (20:23 UTC) Moonrise 9:25PMMoonset 9:11AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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- 812 Am Pdt Mon Aug 19 2019
Today..SW winds 10 to 15 kt. Gusts up to 20 kt this afternoon.
Tonight..SW winds 10 to 15 kt.
Tue..SW winds 10 to 20 kt with gusts up to 25 kt.
Tue night..SW winds 10 to 15 kt.
Wed..SW winds 10 to 15 kt.
Wed night..W winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
Fri..SW winds 15 to 20 kt.
PZZ500 812 Am Pdt Mon Aug 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds today and tonight across the coastal waters as high pressure off the california coast weakens and a surface low develops offshore of the pacific northwest. Locally gusty winds are expected later today and into tomorrow over the inner coastal waters south of point sur. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.


7 Day Forecast for Marine Location Near South San Francisco, CA
   Hourly   EDIT   Help
location: 37.65, -122.36     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 191736
afdmtr
area forecast discussion
national weather service san francisco bay area
1036 am pdt Mon aug 19 2019

Synopsis A deep marine layer will prevail through today,
maintaining widespread morning low clouds and cooler than normal
inland temperatures. Patchy drizzle is possible through mid
morning. Warmer temperatures will develop by midweek and continue
through the upcoming weekend as high pressure rebuilds.

Discussion As of 9:08 am pdt Monday... Visible satellite
imagery reveals widespread stratus coverage across the san
francisco bay area and central california coast. The only
populated locations with clear skies at this time would be in the
interior east bay from pleasant hill and points east, as well as
the parts of the highway 17 corridor between campbell and the
santa cruz-santa clara county line. With the marine layer in
excess of 2,000 ft -- and even 2,500-3,000 ft for some locations
-- many locations can expect the stratus to hang around later than
it usually does on a typical summer day. Along with the deep
marine layer, there are a handful of surface observation sites
that have recorded measurable drizzle in santa cruz county this
morning.

Made some major adjustments to the short-term sky grids, mainly
based on the satellite trends. No other changes are planned at
this time for the morning update as the short-term is on track.

For additional forecast details please refer to to the previous
discussion section.

Prev discussion As of 3:50 am pdt Monday... The marine layer remains
deep early this morning with the fort ord profiler indicating a
depth of more than 3000 feet. The deep stratus cloud layer has
been producing patchy drizzle overnight. The watsonville and
salinas airports have reported trace amounts of precipitation and
a few locations in the santa cruz mountains have picked up
measurable precipitation for the third night in a row (although
amounts are mostly only 0.01"). Conditions early this morning are
much like yesterday morning with similar marine layer depth and
light to moderate onshore flow. So, expect gradual clearing of low
clouds once again today, with some areas likely to remain under
low clouds well into the afternoon hours. Also, cooler than normal
temperatures will continue for inland areas. It appears the eddy
circulation that was over our coastal waters yesterday may be
dissipating. Thus, low level southerly flow will likely end which
should mean more afternoon clearing in the north bay valleys and
santa cruz county compared to yesterday, and also slightly warmer
temps in these areas.

An upper level ridge currently centered over west texas is
forecast to expand westward and across southern california by
midweek. This will result in a compression of the marine layer
over the next few days. In addition, low level flow is forecast to
return to a more typical northwesterly direction which should diminish
inland marine air transport by midweek. The result will be
warming temperatures starting tomorrow, and especially Wednesday
and Thursday. An upper trough is forecast to move over the ridge
and into the pacific northwest on Wednesday, but is not expected
to have a material impact on our weather. By Thursday inland
valleys highs are forecast reach back into the 90s and be about
8-12 degrees warmer than today, yet not nearly as warm as last
Wednesday Thursday.

Although the upper ridge is forecast to strengthen a bit more late
in the week and into next weekend, both the GFS and ecmwf
indicate an end to the warming trend by Friday and even some
localized cooling on Friday and Saturday. This unexpected
temperature trend can likely be attributed to the development of a
surface trough offshore by Friday (something both the GFS and
ecmwf forecast). This trough will generate light southerly low
level flow along our coast from Friday on into the weekend.

Southerly flow will allow for better inland transport of marine
air and thus put an end to the warming trend, or reverse it in
locations such as the north bay valleys and santa cruz county.

Something to watch in the longer range is the potential for a
tropical system developing off the west coast of mexico and then
tracking northwest near the baja peninsula. Based on current model
output there is at least an outside chance that moisture from
this system could make it as far north as central california
during the first half of next week.

Aviation As of 10:36 am pdt Monday... For 18z tafs. The marine
layer is still fairly deep at around 2500 ft agl per the fort ord
profiler. Satellite imagery shows stratus remains over much of
the region this morning, but is finally beginning to dissipate.

Vfr conditions to prevail by this afternoon with clearing
currently expected between 18z-20z. MVFR to ifr CIGS to return
this evening and prevail again overnight for most sites.VFR
conditions will last later into the evening for more inland
locations. W to SW winds this morning increasing this afternoon to
10-15 kt with locally higher gusts at ksfo.

Vicinity of ksfo... MVFR CIGS to continue until around 19z-20z.VFR
conditions expected this afternoon with models showing an earlier
return of MVFR CIGS this evening. SW to W winds around 10 kt this
morning increasing to 15 kt this afternoon with gusts 20-25 kt
after around 20z-21z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ceilings until 18z-20z. Satellite
shows a decent feed of stratus into the peninsula. It is possible
that MVFR CIGS could linger around kmry longer than currently
forecast. Will keep an eye on satellite obs and update the TAF as
needed. Light winds this morning turning onshore in the afternoon
and increasing to 10-15 kt.VFR conditions expected in the
afternoon before MVFR CIGS return early to mid evening and for the
overnight hours.

Marine As of 8:12 am pdt Monday... Generally light winds today
and tonight across the coastal waters as high pressure off the
california coast weakens and a surface low develops offshore of
the pacific northwest. Locally gusty winds are expected later
today and into tomorrow over the inner coastal waters south of
point sur. Mixed seas will continue with shorter period northwest
waves at around 8 to 10 seconds, a light longer period west swell,
and a light southerly swell.

Mtr watches warnings advisories
Tday Sca... Pt pinos to pt piedras blancas 0-10 nm from 5 pm
public forecast: rowe dykema
aviation: as
marine: as
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 mi60 min SW 6 G 11 62°F 69°F1016.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi54 min E 1.9 G 8 63°F 1014.8 hPa
LNDC1 11 mi54 min WSW 6 G 11 62°F 1015.8 hPa
OBXC1 11 mi54 min 62°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi54 min SW 7 G 8.9 64°F 1015.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi54 min SW 8.9 G 12
PXSC1 11 mi54 min 64°F 59°F
FTPC1 - 9414290 - San Francisco, CA 12 mi60 min SSW 8 G 15 61°F 63°F1016 hPa
RTYC1 - 9414523 - Redwood City, CA 13 mi54 min W 12 G 14 66°F 76°F1016.1 hPa
46237 - San Francisco Bar, CA (142) 17 mi54 min 60°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi43 min SSE 7 61°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi60 min SW 8.9 G 12 62°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi54 min 66°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi34 min W 5.8 G 5.8 59°F 3 ft1016.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi54 min WSW 11 G 19 64°F 1014.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi54 min W 13 G 15
UPBC1 30 mi54 min W 13 G 17
PCOC1 - 9415144 - Port Chicago, CA 33 mi54 min W 14 G 16 68°F 72°F1014.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi54 min NW 9.9 G 14 72°F 1013.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi54 min 61°F1015.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi99 min W 9.9 69°F 1015 hPa59°F

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
Last
24hr
SW3
S9
S4
SW3
W11
W13
G17
W12
G17
W11
G17
W9
G12
W9
G12
W6
G9
W9
W7
G10
W7
G10
SW8
SW8
W7
G12
W8
W5
SW4
G8
SW5
G8
SW4
SW6
SW7
1 day
ago
SE4
W8
G11
W16
G20
W15
G19
W12
G18
W14
G17
W13
G16
W11
G14
W8
W3
W4
W3
W2
S9
SW8
G11
S8
SW7
S4
G8
SW7
S7
G10
S3
S4
SE4
SE4
2 days
ago
W9
W5
W12
W8
G11
W10
G14
W9
G13
W8
W4
G8
W7
G10
W9
G13
W4
G7
NW3
W5
G8
NW2
W2
NW2
W2
SE1
E2
S7
G11
S5
G8
E2
G5
S2
SE2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA2 mi88 minSW 1210.00 miOvercast66°F55°F68%1015.8 hPa
Oakland, Metro Oakland International Airport, CA8 mi31 minW 710.00 miOvercast67°F55°F68%1015.8 hPa
San Carlos Airport, CA10 mi37 minW 14 G 1710.00 miPartly Cloudy68°F57°F69%1015.6 hPa
Half Moon Bay Airport, CA12 mi29 minS 99.00 miOvercast61°F59°F94%1016.6 hPa
Hayward, Hayward Air Terminal, CA13 mi30 minW 710.00 miOvercast68°F57°F70%1016.5 hPa
Palo Alto Airport, CA17 mi37 minN 810.00 miPartly Cloudy70°F59°F69%1015.6 hPa
Mountain View, Moffett Field, CA22 mi88 minN 710.00 miFair70°F55°F59%1016.2 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last 24hrS12S15SW16SW19
G24
SW9
G18
S4SW6S7S7S8SW6S7S6SW4SW7W7W6W6W5SW5SW8SW9SW12W9
1 day agoS14SW11SW13
G20
W7S9S12S6S9S10S9S7S8S12S6S6S8S5S6S9E4NE6NE6E6S12
G20
2 days agoNW13NW11NW12NW16NW16NW12NW11W7W8W4W4W8S7W5CalmSW4S4S8S6N3NE6S8S11S12

Tide / Current Tables for Point San Bruno, San Francisco Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Point San Bruno
Click for Map
Mon -- 02:48 AM PDT     6.27 feet High Tide
Mon -- 06:28 AM PDT     Sunrise
Mon -- 09:33 AM PDT     0.93 feet Low Tide
Mon -- 10:11 AM PDT     Moonset
Mon -- 03:50 PM PDT     6.29 feet High Tide
Mon -- 07:57 PM PDT     Sunset
Mon -- 10:02 PM PDT     2.21 feet Low Tide
Mon -- 10:24 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
4.25.366.35.95.13.92.61.6111.62.745.266.35.95.14.13.12.52.22.5

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Sierra Point 1.3 mi ENE
Click for Map
Mon -- 12:23 AM PDT     0.78 knots Max Flood
Mon -- 03:24 AM PDT     -0.00 knots Slack
Mon -- 06:28 AM PDT     Sunrise
Mon -- 06:41 AM PDT     -1.12 knots Max Ebb
Mon -- 09:44 AM PDT     0.01 knots Slack
Mon -- 10:11 AM PDT     Moonset
Mon -- 12:52 PM PDT     0.90 knots Max Flood
Mon -- 04:10 PM PDT     -0.01 knots Slack
Mon -- 07:08 PM PDT     -0.94 knots Max Ebb
Mon -- 07:57 PM PDT     Sunset
Mon -- 10:06 PM PDT     0.00 knots Slack
Mon -- 10:24 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
0.80.70.50.2-0.3-0.7-1-1.1-0.8-0.30.10.50.80.90.80.50.1-0.4-0.8-0.9-0.8-0.4-00.3

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 (16,3,4,5)
      (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.