Monday, August19, 2019 L-36.com


Marine Weather and Tides
Livermore, 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 6:24AMSunset 7:56PM Monday August 19, 2019 10:16 AM PDT (17:16 UTC) Moonrise 9:22PMMoonset 9:08AM Illumination 83% 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
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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 Livermore, CA
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location: 37.6, -121.66     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191608
afdmtr
area forecast discussion
national weather service san francisco bay area
908 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 4:50 am pdt Monday... Stratus in a deep marine
layer continues to advance inland. METAR observations show MVFR
cloud ceilings are fairly widespread, only far inland valleys are
holding ontoVFR. Along the immediate coastline ifr is reported
along with patchy drizzle. Pressure gradients and winds should
focus more from the west today versus on Sunday, diurnal warming
and mixing winds eroding the stratus back to the coastline VFR
by late morning and afternoon. The WRF model then shows the stratus
layer rolling back inland this evening and tonight. Ceilings tonight
similarly returning to MVFR-ifr categories exceptVFR well inland.

Vicinity of ksfo... MVFR forecast until 17z thenVFR, west winds
increasing to 15 knots with gusts to 20 to 25 knots 20z today.

MVFR ceiling returning by mid evening and for the overnight hours.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ceilings until 18z-19z.VFR in the
afternoon then MVFR returning 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: canepa
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 30 mi46 min WNW 2.9 G 5.1 61°F 76°F1016.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi46 min WNW 12 G 15 66°F 1014.1 hPa
AAMC1 - 9414750 - Alameda, CA 36 mi52 min SSW 6 G 8 60°F 70°F1015.9 hPa
LNDC1 36 mi46 min SW 4.1 G 7 61°F 1015.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 37 mi46 min W 13 G 16 62°F 72°F1014.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 38 mi46 min SW 2.9 G 6
OBXC1 39 mi46 min 61°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 39 mi46 min SSW 4.1 G 5.1 61°F 1015.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 39 mi46 min W 11 G 15 62°F 71°F1014.9 hPa
UPBC1 39 mi52 min W 12 G 15
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi52 min W 1 G 1.9 60°F 1014.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 43 mi52 min S 6 G 8 60°F 1015.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 45 mi52 min SW 11 G 14 60°F 1014.8 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi52 min WSW 2.9 G 8 59°F 62°F1015.5 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi46 min 65°F
SFXC1 - San Francisco Bay Reserve, CA 46 mi91 min WNW 8.9 61°F 1014 hPa57°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi65 min SE 2.9 59°F 1015 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA11 mi83 minSSW 610.00 miOvercast61°F54°F78%1014.5 hPa
San Jose / Reid / Hillv, CA20 mi89 minSE 610.00 miOvercast61°F53°F77%1015.6 hPa
San Jose, San Jose International Airport, CA21 mi83 minSSE 410.00 miOvercast62°F59°F90%1015.3 hPa
Mountain View, Moffett Field, CA24 mi80 minN 010.00 miOvercast63°F54°F73%1015.8 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrSW7SW8SW10SW10SW11W11NW12W13NW13W13W10NW7NW9NW6NW5CalmS4SW5SW5SW6S8SW6S6SW3
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Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
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Mon -- 05:34 AM PDT     1.08 feet Low Tide
Mon -- 06:24 AM PDT     Sunrise
Mon -- 10:07 AM PDT     Moonset
Mon -- 10:51 AM PDT     3.32 feet High Tide
Mon -- 05:35 PM PDT     0.30 feet Low Tide
Mon -- 07:53 PM PDT     Sunset
Mon -- 10:21 PM PDT     Moonrise
Mon -- 11:51 PM PDT     3.39 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.332.51.91.41.11.11.42.12.73.23.33.12.721.30.70.40.30.71.32.12.93.3

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Mon -- 12:51 AM PDT     1.04 knots Max Flood
Mon -- 03:49 AM PDT     -0.00 knots Slack
Mon -- 06:27 AM PDT     Sunrise
Mon -- 08:17 AM PDT     -1.12 knots Max Ebb
Mon -- 10:10 AM PDT     Moonset
Mon -- 10:39 AM PDT     0.01 knots Slack
Mon -- 01:20 PM PDT     1.19 knots Max Flood
Mon -- 04:35 PM PDT     -0.01 knots Slack
Mon -- 07:55 PM PDT     Sunset
Mon -- 08:44 PM PDT     -0.94 knots Max Ebb
Mon -- 10:23 PM PDT     Moonrise
Mon -- 11:01 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.910.80.4-0.1-0.4-0.7-1-1.1-0.9-0.40.20.81.21.10.80.3-0.1-0.5-0.7-0.9-0.9-0.5-0

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.