Monday, August21, 2017 L-36.com


Marine Weather and Tides
Walnut Creek, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 6:28AMSunset 7:53PM Monday August 21, 2017 9:04 AM PDT (16:04 UTC) Moonrise 5:20AMMoonset 7:04PM Illumination 0% Phase: New Moon; Moon at 29 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- 232 Am Pdt Mon Aug 21 2017
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..SW winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon. Patchy fog in the morning.
Tonight..SW winds 15 to 25 kt. Patchy fog after midnight.
Tue..SW winds 10 to 20 kt. Patchy fog in the morning.
Tue night..SW winds 10 to 20 kt.
Wed..SW winds 10 to 20 kt.
Thu..SW winds 5 to 15 kt.
Fri..SW winds 10 kt.
PZZ500 232 Am Pdt Mon Aug 21 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light and variable winds will prevail over the coastal waters through about mid week, with the exception of the northern san francisco bay zone, which will be breezy during the afternoon and evening hours. As a result, seas are anticipated to remain relatively tame, occasionally choppy. High pressure builds in from the west by Wednesday, increasing winds from the northwest.

7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211545
afdmtr
area forecast discussion
national weather service san francisco bay area
845 am pdt Mon aug 21 2017

Synopsis Look for overnight clouds at the coast and adjacent
inland spots through most of the period. Temperatures will begin
to warm again later in the week as a ridge of high pressure starts
to build into our region.

Discussion As of 08:41 am pdt Monday... Deep marine layer
remains in place over the region this morning with low clouds
holding on strong over most valley locations and along the coast.

This cloud cover should begin to scatter out late morning over the
valleys and by early afternoon closer to the coast. However,
cannot rule out some coastal locations remaining under cloud cover
through much of the day. Have removed mention of fog from the
forecast this morning given current observations and state of the
stratus deck. Otherwise, the forecast remains on track. Please see
the forecast discussion below for additional details.

Prev discussion As of 3:00 am pdt Monday... Over the past few
hours we have seen a substantial increase in clouds across a good
portion of our cwa. Unlike most days when other weather parameters
are the focus, clouds are the main story today as many people
will be trying to view (don't forget the proper eyewear!) the
solar eclipse this morning. Unfortunately, guidance has become a
bit more pessimistic with the last couple of runs and now shows a
better shot of clouds impacting portions of the san francisco bay
region. For those looking to view it, advice remains the same --
head well inland for your best shot. Please see the "eclipse"
section below for specific viewing times.

Outside of the eclipse, quiet weather will be the rule for the
entire week. Temperatures will be seasonably cool inland today
into Wednesday as an upper level low and shortwave trough remain
near our cwa. Instead of seeing a typical 40 degree gradient, we
will generally see half of that. Coastal spots will be in the 60s
to mid 70s with mid 70s to around 90 inland.

Toward the end of the week temperatures will begin to increase
(especially away from the coast) as a ridge of high pressure
centered near the four corners builds into california. Highs will
move back to above normal levels with vary warm conditions likely
next weekend.

Aviation As of 4:57 am pdt Monday... For 12z tafs. Mid-level
and surface low pressure about 100 miles off the coast of southern
california will tamper with the typical wind pattern across the
district a tad today. Otherwise, stratus quo will continue through
mid to late morning. Satellite shows extensive stratus filling in
nicely at this hour, under a 2400 foot marine layer. All taf
sites show MVFR ifr CIGS per 11z surface observations, minus ksfo
atVFR. Expect CIGS to continue through 16-17z before clearing
occurs. Mid-level moisture from aforementioned low will bring in
sct-bkn around 10-15k feet through the day. Light and variable
winds will turn westerly at 10 to 15 kt this afternoon. Stratus
and fog is expected to redevelop tonight.

Vicinity of ksfo... Stratus expected to fill in over the next hour
or so over the terminal. MVFR expected through about 16z, then
vfr. Will amend timing if necessary. Southwest winds will turn
westerly and increase by 18-19z, though only expected to remain
around 15 kt this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr through 17-18z, with low
confidence on exact clearing. Generally light onshore winds this
afternoon, around 10-12 kt, with winds being more southwesterly at
kmry. An early return of stratus expected again tonight.

Eclipse Here are the times for the start, peak, and end of the
eclipse for Monday morning. The percent of obscuration for each
location is also listed.

Santa rosa... San francisco... Oakland... San jose... Monterey

Start... 9:01... ... ... .9:01... ... ... 9:02... ... 9:02... ... .9:02..

Peak... 10:15... ... ... 10:15... ... ..10:15... ..10:16... ... 10:16..

End... .11:37... ... ... 11:37... ... ..11:37... ..11:38... ... 11:38..

Obscur... 78%... ... ... ..76%... ... ... .76%... ... .74%... ... ..71%...

Marine As of 2:32 am pdt Monday... Light and variable winds
will prevail over the coastal waters through about mid week, with
the exception of the northern san francisco bay zone, which will
be breezy during the afternoon and evening hours. As a result,
seas are anticipated to remain relatively tame, occasionally
choppy. High pressure builds in from the west by Wednesday,
increasing winds from the northwest.

Mtr watches warnings advisories
Tday Sca... Sf bay from 1 pm
public forecast: rgass bell
aviation: bam
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi46 min W 12 G 22 63°F 68°F1015.8 hPa61°F
PCOC1 - 9415144 - Port Chicago, CA 11 mi46 min WSW 17 G 22 63°F 68°F1015.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi46 min WNW 17 G 24 64°F 1014.1 hPa
LNDC1 14 mi46 min W 6 G 9.9 63°F 1016 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi46 min WSW 7 G 11 63°F 1016.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi46 min WSW 9.9 G 12
AAMC1 - 9414750 - Alameda, CA 16 mi46 min W 4.1 G 6 63°F 68°F1016.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi46 min W 12 G 17 63°F 1015.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi46 min SW 11 G 14 63°F 1016.3 hPa
OBXC1 17 mi46 min 63°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi52 min W 2.9 G 8.9 62°F 1014.9 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi46 min SSW 4.1 G 9.9 62°F 64°F1016 hPa
PXSC1 20 mi46 min 64°F 60°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi79 min W 9.9 62°F 1014 hPa58°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi62 min SE 5.1 61°F 1016 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi46 min WSW 4.1 G 12 62°F 63°F1016.5 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi46 min S 4.1 G 6 65°F 73°F1015.4 hPa
46237 - San Francisco Bar, CA (142) 32 mi64 min 61°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi74 min SSE 1.9 G 3.9 60°F 59°F3 ft1015.9 hPa (+1.5)

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi71 minWSW 1010.00 miOvercast64°F57°F81%1013.9 hPa
Oakland, Metro Oakland International Airport, CA16 mi71 minW 810.00 miOvercast63°F59°F87%1015.6 hPa
Hayward, Hayward Air Terminal, CA17 mi70 minWNW 710.00 miOvercast64°F55°F75%1016.4 hPa
Livermore, Livermore Municipal Airport, CA18 mi71 minW 109.00 miOvercast64°F57°F81%1015 hPa

Wind History from CCR (wind in knots)
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Last 24hrSW4W10W11W12W13W13W13SW11SW12SW12W13W11W11W11W12W11W9W13SW9
G17
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1 day agoW9W13W5NW10NW10W10SW10W13S9SW9W9W8W8W75W7SW5SW10W4W7W7W6W7W6
2 days ago3NW8NW9NW9NW11NW13NW13NW14W12W11W6W7W6W7W5W7W8W9W5W5W3W3SW5W7

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Mon -- 01:15 AM PDT     6.02 feet High Tide
Mon -- 06:19 AM PDT     Moonrise
Mon -- 06:29 AM PDT     Sunrise
Mon -- 08:34 AM PDT     -0.33 feet Low Tide
Mon -- 11:31 AM PDT     New Moon
Mon -- 02:49 PM PDT     5.03 feet High Tide
Mon -- 07:53 PM PDT     Sunset
Mon -- 08:04 PM PDT     Moonset
Mon -- 08:19 PM PDT     1.58 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.665.95.13.92.61.40.4-0.2-0.30.41.62.944.854.63.72.821.61.72.43.6

Tide / Current Tables for Stake Point .9 Mi NNW, Suisun Bay, California Current
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Stake Point .9 Mi NNW
Click for Map
Mon -- 12:50 AM PDT     0.97 knots Max Flood
Mon -- 03:43 AM PDT     -0.01 knots Slack
Mon -- 06:19 AM PDT     Moonrise
Mon -- 06:28 AM PDT     Sunrise
Mon -- 07:20 AM PDT     -0.94 knots Max Ebb
Mon -- 10:42 AM PDT     0.00 knots Slack
Mon -- 11:31 AM PDT     New Moon
Mon -- 02:35 PM PDT     0.86 knots Max Flood
Mon -- 05:26 PM PDT     -0.00 knots Slack
Mon -- 07:52 PM PDT     Sunset
Mon -- 08:03 PM PDT     Moonset
Mon -- 08:06 PM PDT     -0.54 knots Max Ebb
Mon -- 10:14 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.910.80.4-0.1-0.5-0.8-0.9-0.9-0.7-0.30.10.50.70.80.80.60.2-0.2-0.4-0.5-0.4-0.10.3

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 (12,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map

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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.