Thursday, June22, 2017 L-36.com


Marine Weather and Tides
Mountain House, CA

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:43AMSunset 8:32PM Thursday June 22, 2017 11:36 AM PDT (18:36 UTC) Moonrise 3:39AMMoonset 6:05PM Illumination 2% Phase: Waning Crescent; Moon at 28 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 San Francisco Bay North Of The Bay Bridge- 833 Am Pdt Thu Jun 22 2017
.small craft advisory in effect from 2 pm pdt this afternoon through this evening...
Today..SW winds 10 kt...increasing to 15 to 25 kt in the afternoon.
Tonight..SW winds 10 to 20 kt.
Fri..SW winds 10 to 20 kt.
Fri night..SW winds 10 to 20 kt. Patchy fog after midnight.
Sat..SW winds 15 to 25 kt. Patchy fog in the morning.
Sun..SW winds 10 to 20 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 833 Am Pdt Thu Jun 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A small craft advisory has been added for the northern san francisco bay/west delta this afternoon through early evening. Westerly winds will be gusty through the golden gate to angel island area, as well as suisun bay. Split flow with moderate northwest winds primarily over the northern outer waters with lighter southwest winds elsewhere. Hazardous seas from steep wind waves and fresh swell can be expected over the outer waters through the day. Look for gradually improving conditions late today through the remainder of the week.

7 Day Forecast for Marine Location Near Mountain House, CA
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location: 37.83, -121.57     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221749
afdmtr
area forecast discussion
national weather service san francisco bay area
1049 am pdt Thu jun 22 2017

Hot weather continues inland through this evening...

Synopsis Heat advisories and warnings are in place today
through 9 pm for dangerously hot temperatures. A shallow marine
layer along the central coast will keep the monterey bay coastal
areas much cooler. All areas start to gradually cool Friday and
through the weekend as more persistent onshore flow returns to the
region.

Discussion As of 07:25 am pdt Thursday... The well-advertised
very hot Thursday is upon us. Excessive heat warnings cover the
interior east bay hills and valleys, the north bay hills, the
higher elevations of monterey county, as well as the santa cruz
mountains until 9 pm pdt this evening. Heat advisories remain in
effect for the southern salinas valley, interior san benito county
including pinnacles national park, the santa clara valley, and
the north bay valleys until 9 pm pdt. Furthermore, the heat
advisory for the san francisco bay shoreline begins at 11 am pdt
this morning and GOES through the evening hours. Don't see any
reason to alter these products at this time, but will have to
consider additional headlines for Friday across the warmest
locations.

The 24 hour change in temperatures across the ASOS sites is
remarkable. At 7 am, santa rosa is sitting 7 degrees warmer than
24 hours ago, san rafael 10 degrees warmer, and 8 degrees warmer
at napa in the north bay. Across the major airports around the
san francisco bay, everyone is running warmer than 24 hours ago as
well. San francisco international airport and is 7 degrees
warmer, san jose 11 degrees warmer, and oakland is 6 degrees
warmer. The marine layer is much more compressed today than
yesterday as well, limiting the inland intrusion and yielding
mostly clear skies for most. Low clouds are surging north along
the san mateo coast and will likely approach the golden gate
later this morning or afternoon. This could impact high temps
around downtown and will have to monitor carefully.

We cannot stress the hazards from this heatwave enough. Many
locations away from the coast have been above normal for over a
week. The prolonged nature of this heatwave introduces dangerous
hazards beyond the typical heatwave. Over a 30 year period, heat
is the number one weather-related killer in the united states --
131 deaths per year from 1987 to 2016 on average. Take care of
yourself, your family, and your pets. Check in on your neighbors
and the elderly. Take the necessary precautions to beat the heat:
drink plenty of fluids, limit outdoor activity during the hottest
time of the day, wear light-colored clothing, put on a hat. If you
don't have air conditioning, consider going to a community
cooling center, a shopping center mall, or movie theater. If
you're parked in the shade, or even if you're at the coast with
outdoor temperatures in the 60s: never leave children, pets, or
adults alone in a parked vehicle. Stay safe, stay hydrated, and
beat the heat.

No major changes planned to the current forecast; please refer to
the previous discussion section for additional forecast
information.

Prev discussion As of 4:06 am pdt Thursday... Northerly gradient
down the coast is still around 6 mb and helping to support some
north northeast winds across the north bay hills. A few sites in
the north bay hills are still above 90 as of 3 am with widespread
70s and 80s in the hills. There is still enough onshore flow at
the surface with 2 mb sfo to sac to allow the valleys to cool into
the 60s. Its this somewhat subtle northerly wind flow in the
hills that will set the stage for rapid warming today, especially
for the interior of the north and east bay. Essentially heat
advisories are in place near sf bay and some of the valleys with
warnings in place for the hills and far east bay where warm
overnight lows and hot days have meant little or no relief from
the heat. The warnings advisories remain in place through 9 pm. If
seeking relief the coast from santa cruz southward through
monterey county is the place to be with an 800 foot marine layer
in place. The immediate coast will remain out of any headlines.

Even though 850 mb temps dont change too much into Friday we
expect noted cooling to occur especially for the coastal and
bayside valleys. The upper flow will become so amplified and
eventually buckle with weak surface low pressure (around 1010 mb)
developing well offshore. This in combination with the excessive
heat across the central valley will induce persistent onshore flow
Friday and through the weekend as well as a deepening marine
layer. Upshot is to expect a modest cooling trend back to more
seasonable levels.

Long range trends on the latest ECMWF show the upper pattern with
a trough off the coast suggesting near to perhaps slightly below
normal temperatures for next week. No precipitation, outside of
coastal drizzle is forecast.

Aviation As of 10:44 am pdt Thursday... For 18z tafs.VFR at
all TAF sites at this hour. Visible satellite shows a southerly
surge of stratus along the central california coast, but
struggling to push north of the santa cruz san mateo coast due to
the presence of subsident dry air from high pressure aloft that is
compressing the marine layer. Therefore, clear skiesVFR expected
to continue through this evening and through the forecast period
for bay area terminals. Current thinking is stratus will return
for monterey bay terminals tonight. Generally light, occasionally
breezy onshore winds this afternoon and evening. For tonight,
mostly clear skies with some stratus primarily banked up along the
monterey expected.

Moderate to high forecast confidence.

Vicinity of ksfo...VFR. Patchy haze possible during the morning
hours Friday. Light winds becoming breezy by this afternoon, up to
15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through this afternoon, with ifr lifr
cigs likely returning later this evening. Low confidence on
duration. Light westerly northwesterly winds.

Fire weather As of 4:06 am pdt Thursday... The most critical
areas this morning will be the hills of the north bay, especially
napa county and around mt st helena where winds above 2000 feet
will be northeast and gusting 20-25 mph. Humidity values are
starting to drop down to 20-30% in the hills as of 3 am with hot
temperatures in the 80s and lower 90s at this early hour. Expect a
hot and dry day all inland areas and hills today. Main concern
this afternoon will be a transition to westerly winds should any
new starts occur.

Although onshore flow will return by tonight, the marine layer
will remain shallow and the airmass aloft will remain very warm
for a few more days. Thus, conditions in the hills will only
gradually improve from Friday through the weekend. Much improved
conditions are expected by early next week.

Climate
Here is a list of record high temperatures
sf bay area Thursday
location... ... ... ... ... ..Temp year
kentfield... ... ... ... ... .102 1989
san rafael... ... ... ... ... .99 2006
napa... ... ... ... ... ... ... 105 1981
san francisco... ... ... ... .97 1989
sfo airport... ... ... ... ... 98 1989
oakland airport... ... ... ..94 1957
richmond... ... ... ... ... ... 94 1989
livermore... ... ... ... ... .110 1961
moffett field... ... ... ... .99 1989
san jose... ... ... ... ... ..101 1989
gilroy... ... ... ... ... ... .110 1973
monterey bay area Thursday
location... ... ... ... .. Temp year
salinas... ... ... ... ... ... .89 1981
salinas airport... ... ... ..92 1947
king city... ... ... ... ... .110 1929

Marine As of 10:31 am pdt Thursday... A small craft advisory has
been added for the northern san francisco bay west delta waters
this afternoon through early evening. Westerly winds will be gusty
through the golden gate to angel island area, as well as suisun
bay. Split flow with moderate northwest winds primarily over the
northern outer waters with lighter southwest winds elsewhere.

Hazardous seas from steep wind waves and fresh swell can be
expected over the outer waters through the day. Look for gradually
improving conditions late today through the remainder of the
week.

Mtr watches warnings advisories
Tday Heat advisory... Caz508
heat advisory... Caz506-513-516-518
excessive heat warning... Caz507-510>512-517
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 9 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 pm
sca... Sf bay from 2 pm
public forecast: rowe rww
aviation: bam
marine: bam drp
fire weather: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi48 min WNW 6 G 7 80°F 1005.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 29 mi48 min WSW 6 G 7 81°F 72°F1006.2 hPa
UPBC1 33 mi48 min WNW 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi48 min W 9.9 G 11 75°F 72°F1006.7 hPa63°F
SFXC1 - San Francisco Bay Reserve, CA 35 mi111 min SW 1.9 86°F 1006 hPa67°F
LNDC1 38 mi48 min N 4.1 G 5.1 72°F 1007 hPa
AAMC1 - 9414750 - Alameda, CA 39 mi48 min WNW 2.9 G 4.1 75°F 65°F1007.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi48 min NW 5.1 G 5.1 73°F 1006.7 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 40 mi48 min WNW 8 G 8.9 63°F 1007.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 40 mi48 min W 5.1 G 5.1
OBXC1 41 mi48 min 64°F 58°F
RTYC1 - 9414523 - Redwood City, CA 41 mi48 min N 4.1 G 6 73°F 74°F1006.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi48 min SSW 7 G 9.9 63°F 1007.6 hPa
PXSC1 44 mi48 min 72°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi48 min W 5.1 G 7 73°F 1006.1 hPa
RCMC1 - 9414863 - Richmond, CA 45 mi48 min SSE 2.9 G 4.1
TIBC1 - Tiburon Pier, San Francisco Bay, CA 47 mi49 min ESE 1 71°F 1007 hPa
FTPC1 - 9414290 - San Francisco, CA 48 mi48 min SW 6 G 12

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA16 mi43 minNW 310.00 miFair99°F45°F16%1005.6 hPa
Stockton, Stockton Metropolitan Airport, CA18 mi41 minW 710.00 miFair95°F53°F24%1005.7 hPa

Wind History from LVK (wind in knots)
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Last 24hrSW44Calm6W12W14W9W11S3NW4NW4N3CalmCalmCalmS3NE3CalmCalmCalm33NE7NW3
1 day agoW7W5W8NW10NW13NW12W10W10NW7NW9NW10NW8NW4NW7NW6NW5NW6N3NW5CalmW3W433
2 days ago5W7W9W11W13W12W12W11NW8W4W4W3CalmNW3W4W3W3CalmCalmW4SW4SW5SW3W4

Tide / Current Tables for Borden Highway Bridge, Old River, San Joaquin River, California
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Borden Highway Bridge
Click for Map
Thu -- 04:38 AM PDT     Moonrise
Thu -- 05:00 AM PDT     3.64 feet High Tide
Thu -- 05:44 AM PDT     Sunrise
Thu -- 12:39 PM PDT     -0.32 feet Low Tide
Thu -- 06:51 PM PDT     2.53 feet High Tide
Thu -- 07:05 PM PDT     Moonset
Thu -- 08:32 PM PDT     Sunset
Thu -- 11:46 PM PDT     0.98 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.52.233.53.63.532.21.40.70.1-0.2-0.300.61.422.42.52.31.81.41.1

Tide / Current Tables for Vulcan Island .5 mi E, San Joaquin River, California Current
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Vulcan Island .5 mi E
Click for Map
Thu -- 02:05 AM PDT     0.85 knots Max Flood
Thu -- 04:37 AM PDT     Moonrise
Thu -- 05:28 AM PDT     -0.00 knots Slack
Thu -- 05:43 AM PDT     Sunrise
Thu -- 08:53 AM PDT     -0.67 knots Max Ebb
Thu -- 01:09 PM PDT     0.00 knots Slack
Thu -- 04:02 PM PDT     0.57 knots Max Flood
Thu -- 07:04 PM PDT     Moonset
Thu -- 07:15 PM PDT     -0.00 knots Slack
Thu -- 08:31 PM PDT     Sunset
Thu -- 09:26 PM PDT     -0.27 knots Max Ebb
Thu -- 11:57 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.70.80.80.50.2-0.2-0.5-0.6-0.7-0.6-0.5-0.3-00.30.50.60.50.30.1-0.1-0.3-0.3-0.2

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (14,3,4,5)
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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.