Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
San Leandro, CA

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:27AMSunset 7:56PM Tuesday August 20, 2019 7:49 PM PDT (02:49 UTC) Moonrise 9:52PMMoonset 10:07AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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- 216 Pm Pdt Tue Aug 20 2019
.small craft advisory in effect until 9 pm pdt this evening...
.small craft advisory in effect from Wednesday afternoon through Wednesday evening...
Rest of today..W winds 15 to 20 kt with gusts up to 30 kt.
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt.
Wed..SW winds 15 to 20 kt with gusts up to 30 kt.
Wed night..SW winds 10 to 15 kt.
Thu..SW winds 10 to 15 kt.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 20 to 25 kt with gusts up to 30 kt.
Sat..SW winds 15 to 20 kt.
PZZ500 216 Pm Pdt Tue Aug 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate northwest winds will persist across the coastal waters through mid-week as high pressure sits over the eastern pacific and a surface low moves into western canada. Locally gusty coastal jets are forecast south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay around the golden gate and through the delta as well as over the Monterey bay. 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 San Leandro, CA
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location: 37.68, -122.17     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 202350
afdmtr
area forecast discussion
national weather service san francisco bay area
450 pm pdt Tue aug 20 2019

Synopsis A warming trend is forecast through Thursday as high
pressure builds over central and southern california. Inland areas
will see less in the way of night and morning low clouds as the
marine layer compresses. Seasonable temperatures are forecast
through the upcoming weekend, along with continued dry
conditions.

Discussion As of 02:30 pm pdt Tuesday... California is
positioned between two synoptic scale features early this
afternoon -- an advancing trough to the northwest and a
retrograding ridge to the southeast. Both of these features have
played a role in driving the local weather today with the
advancing trough encouraging a deeper marine layer overnight into
this morning and the retrograding ridge suppressing the marine
layer and forcing warmer temperatures and the mostly skies early
this afternoon. While the ridge has taken over as the dominate
feature early this afternoon, the advancing trough will wrest
control from the ridge, at least across the north bay, through the
remainder of the day as cooler, moister air mass advects inland from
the west. Latest satellite imagery shows scattered to broken high
clouds on the leading edge of this air mass boundary now shifting
inland across the mendocino coast and northward at this hour. Expect
to see some of these clouds spread into the north bay and parts of
the immediate bay area later this afternoon into the evening but
will probably arrive too late to drastically impact todays afternoon
high temperatures.

Forecast models have struggled with the specifics of what happens
next but generally agree that the ridge will deflect the advancing
trough northward into the pacnw extreme norcal after attempting to
invade the golden state.

For tonight, the marine layer will become suppressed by the
retrograding ridge across the central coast and parts of the bay
area but may instead mix out across the sonoma marin coastlines due
to the presence of the cooler air aloft in the advancing trough. As
such, would not be surprised to see patchy fog and periods of
drizzle along the coastline from the san mateo coastline southward
through big sur with fractured cloud decks across the north bay.

The long range forecast models then depict a steady rise in
atmospheric heights over the 7 plus days however that rise will
not necessarily dictate a steady rise in temperatures.

For tomorrow, the ridge will become the dominate player after the
trough has deflected to the north into the pacific northwest and
promote the warmest temperatures of this work week for most areas.

That said, the north bay high temperatures may somewhat lag behind
the rest of the forecast area tomorrow after a secondary vort
pulse within the broader parent trough over the pacnw forces it to
briefly dip back into northern california.

Temperatures tomorrow will range from near normal along the
shorelines to up to 10 degrees above normal for the inland areas.

Afternoon highs of 60s to low 70s are forecast along the coast,
upper 70s to upper 80s for areas in some proximity to a
coast shoreline, and into the low to mid 90s for the extreme
inland areas far from the coast. The marine layer should further
compress tomorrow night into Thursday morning which will allow
Thursday morning's temperatures to slightly outpace Wednesday's.

By the afternoon, Thursday temperatures will come into line with
Wednesdays readings though the north east bay should run slightly
warmer than the previous day given the absence of a trough on
their northern periphery.

500mb heights continue to increase into Friday as the ridge shifts
offshore and amplifies. Despite this, temperatures are forecast
to stall or even drop primarily due to a shift in wind direction
to the southwest. This shift in wind direction should increase
the onshore advection of cool, moist air to inland regions despite
the warmer air subsiding from aloft. A warming trend is then
expected through the weekend and into early next week with the
hottest temperatures anticipated to arrive early to mid next
week.

The one potential gotcha in the long range forecast is the
presence of a potential tropical disturbance (80-90% chance of
organization) currently off the southern coast of mexico. GFS euro
ensemble members give this system a roughly 33-40% chance of
moving into the broader vicinity of the sf monterey bay areas by
early next week, potentially introducing increased a wetter, more
unstable air mass underneath a broader high pressure ridge.

Needless to say, there remains a fair amount of uncertainty in the
forecast over the next week.

Aviation As of 4:50 pm pdt Tuesday... An upper level ridge over
the southwest will expand westward into california. This will
compress the marine layer overnight resulting in lower cloud bases
but as the marine layer becomes better defined... There should be
more widespread low clouds late tonight. Low clouds have mixed out
quite well today and will take some time to redevelop so an early
return of CIGS is not expected. CIGS not expected at sfo or the
approach until after 06z.

Vicinity of ksfo... MVFR CIGS after 06z with bases around 1500 ft
possibly lowering to near 1200 ft after 12z. West winds 15-18 kt
gusting to 25 kt through 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR CIGS after 04z at mry and after 08z
at sns. CIGS lowering to ifr a couple of hours after the CIGS come
in. West winds 10 kt gusting 15-18 kt through 04z.

Marine As of 04:31 pm pdt Tuesday... Light to moderate northwest
winds will persist across the coastal waters through mid-week as
high pressure sits over the eastern pacific and a surface low
moves into western canada. Locally gusty coastal jets are
forecast south of point arena, pigeon point, and point sur that
will create hazardous seas conditions for smaller vessels. Breezy
afternoon and evening winds are also forecast over the san
francisco bay around the golden gate and through the delta as
well as over the monterey bay. 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
Tngt Sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
sca... Pt arena to pt reyes 0-10 nm 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
public forecast: drp
aviation: W pi
marine: as
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi55 min W 8.9 G 13 65°F 71°F1015.8 hPa
LNDC1 10 mi49 min WSW 6 G 8 66°F 1015.1 hPa (-0.8)
OBXC1 12 mi49 min 64°F 62°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi55 min WSW 13 G 17
RTYC1 - 9414523 - Redwood City, CA 12 mi49 min WNW 13 G 17 67°F 75°F1016.3 hPa (+0.0)
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi49 min W 9.9 G 13 64°F 1015 hPa (-0.8)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi49 min WSW 9.9 G 14 64°F 1014.2 hPa
PXSC1 15 mi49 min 65°F 60°F
FTPC1 - 9414290 - San Francisco, CA 18 mi55 min W 7 G 12 62°F 62°F1015.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi49 min NW 12 G 15 71°F 1015.1 hPa
RCMC1 - 9414863 - Richmond, CA 21 mi49 min 66°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi44 min NW 5.1 67°F 1015 hPa
UPBC1 25 mi49 min W 21 G 24
MZXC1 - 9415102 - Martinez-Amorco CA 25 mi49 min W 15 G 17 70°F 71°F1014.3 hPa (-0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi49 min W 12 G 17 70°F 1014.2 hPa (-0.3)
46237 - San Francisco Bar, CA (142) 26 mi49 min 60°F4 ft
PCOC1 - 9415144 - Port Chicago, CA 27 mi49 min WSW 13 G 19 70°F 72°F1014.1 hPa (-0.3)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 29 mi49 min WNW 12 G 20 73°F 1013.3 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 36 mi39 min WNW 12 G 16 60°F 58°F1016.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 37 mi64 min WNW 13 72°F 1014 hPa56°F
PRYC1 - 9415020 - Point Reyes, CA 48 mi49 min 62°F1015.8 hPa (-1.0)

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA3 mi55 minWNW 1210.00 miA Few Clouds66°F57°F73%1016.5 hPa
Oakland, Metro Oakland International Airport, CA3 mi56 minW 1710.00 miPartly Cloudy68°F57°F70%1015.4 hPa
San Carlos Airport, CA11 mi62 minW 11 G 1510.00 miClear68°F55°F64%1015.9 hPa
San Francisco, San Francisco International Airport, CA11 mi53 minW 17 G 2410.00 miPartly Cloudy66°F55°F70%1015.3 hPa
Palo Alto Airport, CA14 mi62 minNW 1410.00 miPartly Cloudy70°F55°F60%1015.6 hPa
Mountain View, Moffett Field, CA18 mi53 minNW 610.00 miFair70°F55°F59%1015.7 hPa
Livermore, Livermore Municipal Airport, CA19 mi56 minWNW 1210.00 miFair69°F55°F61%1014.2 hPa
Half Moon Bay Airport, CA21 mi54 minNW 810.00 miOvercast63°F59°F88%1016.6 hPa
Concord, Buchanan Field, CA22 mi56 minW 1010.00 miFair74°F55°F52%1013 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrW11--------W12W13W11W9W11W11
G18
W8W9W11W9W10W10W9W12--W11W14W17W17
1 day agoNW6W7W3--5----W9W10W11W9SW8--SW8SW5--SW7--W8W13W12W15W14W9
2 days agoW6SW3SW6SW13SW13--SW9SE74Calm----CalmE7S5S5W5W8SW13SW11SW13SW15W11W9

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
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Roberts Landing
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Tue -- 03:46 AM PDT     6.18 feet High Tide
Tue -- 06:28 AM PDT     Sunrise
Tue -- 10:25 AM PDT     1.36 feet Low Tide
Tue -- 11:06 AM PDT     Moonset
Tue -- 04:36 PM PDT     6.67 feet High Tide
Tue -- 07:54 PM PDT     Sunset
Tue -- 10:51 PM PDT     Moonrise
Tue -- 11:09 PM PDT     2.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.14.15.266.25.853.92.81.91.41.52.23.34.65.86.56.66.15.24.13.12.42.1

Tide / Current Tables for Oakland Airport SW, South San Francisco Bay, California Current
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Oakland Airport SW
Click for Map
Tue -- 12:54 AM PDT     0.48 knots Max Flood
Tue -- 03:54 AM PDT     -0.00 knots Slack
Tue -- 06:28 AM PDT     Sunrise
Tue -- 06:45 AM PDT     -0.66 knots Max Ebb
Tue -- 09:56 AM PDT     0.00 knots Slack
Tue -- 11:07 AM PDT     Moonset
Tue -- 01:16 PM PDT     0.54 knots Max Flood
Tue -- 04:27 PM PDT     -0.00 knots Slack
Tue -- 07:13 PM PDT     -0.64 knots Max Ebb
Tue -- 07:55 PM PDT     Sunset
Tue -- 10:36 PM PDT     0.00 knots Slack
Tue -- 10:51 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.40.2-0-0.3-0.6-0.6-0.5-0.200.20.40.50.50.30.1-0.2-0.5-0.6-0.6-0.4-0.10.1

Weather Map and Satellite Images
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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 (22,6,7,8)
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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.