Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Roseland, 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 6:28AMSunset 8:00PM Tuesday August 20, 2019 5:21 PM PDT (00:21 UTC) Moonrise 9:53PMMoonset 10:09AM Illumination 72% 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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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 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 Thursday evening...
Rest of today..NW winds 15 to 25 kt with gusts up to 30 kt. NW swell 2 to 4 ft at 10 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. NW swell 2 to 4 ft at 10 seconds.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 2 to 3 ft. NW swell 2 to 4 ft at 13 seconds.
Wed night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 12 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. W swell 6 to 8 ft at 11 seconds and sw around 2 ft at 20 seconds.
Thu night..NW winds 15 to 25 kt with gusts up to 30 kt. NW swell 6 to 8 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri..W winds 15 to 20 kt. NW swell 5 to 7 ft and sw around 2 ft.
Sat..NW winds 5 to 10 kt. Wind waves 2 to 3 ft. NW swell 3 to 5 ft and sw around 2 ft.
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 Roseland, CA
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location: 38.43, -122.71     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
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 33 mi51 min 62°F1016.7 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 34 mi31 min W 12 G 14 53°F4 ft1016.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi57 min WSW 8.9 G 12 72°F 1014.5 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi51 min 67°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi40 min WSW 4.1 70°F 1015 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi96 min W 12 80°F 1014 hPa59°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi57 min SW 11 G 15 65°F 1015.5 hPa
UPBC1 41 mi57 min WNW 13 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi51 min W 12 G 14 75°F 72°F1014.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi51 min W 12 G 17 76°F 72°F1014.2 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi51 min WSW 12 G 19 62°F1016 hPa
46237 - San Francisco Bar, CA (142) 45 mi51 min 61°F3 ft
PXSC1 46 mi51 min 67°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi51 min WSW 8 G 11 65°F 1015.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi31 min W 9.7 G 12 60°F 59°F3 ft1017.1 hPa
OBXC1 47 mi51 min 65°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 47 mi57 min WSW 7 G 17 65°F 1014.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 48 mi51 min WSW 7 G 8.9
LNDC1 49 mi51 min WSW 7 G 11 66°F 1015.7 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA8 mi88 minSSE 810.00 miFair80°F59°F49%1014.1 hPa
Petaluma Municipal Airport, CA13 mi66 minW 99.00 miFair73°F57°F57%1015.9 hPa
Novato / Gnoss Field, CA21 mi66 minSW 11 G 1810.00 miFair77°F57°F51%1014.9 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrSE10S11SE8SE8SE5SE3S34SE3CalmS3S3W4SW3CalmSW3Calm3SW6S5CalmS7S8SE12
1 day agoS6S9S8S8S7S5SW4SE5SW3S5CalmCalmCalmCalmCalmS3CalmS3CalmSW53SW4SW8S10
2 days agoS13S10S7S5SE4SE3S3S3CalmCalmCalmSW4CalmCalmCalmNW5W3334SE4SW10S9SW8

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
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Tue -- 12:02 AM PDT     1.71 feet Low Tide
Tue -- 05:04 AM PDT     5.54 feet High Tide
Tue -- 06:29 AM PDT     Sunrise
Tue -- 11:09 AM PDT     Moonset
Tue -- 12:07 PM PDT     1.02 feet Low Tide
Tue -- 05:54 PM PDT     6.11 feet High Tide
Tue -- 07:57 PM PDT     Sunset
Tue -- 10:52 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.134.15.15.55.44.83.92.921.311.32.23.54.85.86.15.85.14.13.12.3

Tide / Current Tables for Lakeville, Petaluma River, San Pablo Bay, California
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Lakeville
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Tue -- 04:53 AM PDT     5.31 feet High Tide
Tue -- 06:29 AM PDT     Sunrise
Tue -- 11:08 AM PDT     Moonset
Tue -- 11:47 AM PDT     1.02 feet Low Tide
Tue -- 05:43 PM PDT     5.85 feet High Tide
Tue -- 07:57 PM PDT     Sunset
Tue -- 10:52 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.72.33.24.255.35.14.43.52.51.71.211.52.53.74.95.75.85.54.73.72.82

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 (20,4,5,8)
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Ground Weather Radar Station Sacramento, 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.