Sunday, July23, 2017 L-36.com


Marine Weather and Tides
Pacifica, 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 6:06AMSunset 8:26PM Sunday July 23, 2017 1:36 AM PDT (08:36 UTC) Moonrise 5:28AMMoonset 7:48PM 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 859 Pm Pdt Sat Jul 22 2017
Tonight..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 8 seconds. Patchy fog after midnight.
Sun..S winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 8 seconds. Patchy fog in the morning.
Sun night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog after midnight. Patchy drizzle after midnight.
Mon..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds. Patchy fog in the morning. Patchy drizzle in the morning.
Mon night..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight. Patchy drizzle after midnight.
Tue..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft. Patchy fog.
Wed..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft. Patchy fog.
Thu..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant swell period of 8 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 8 seconds. Maximum ebb current of 2.1 knots at 03:06 am Sunday and 1.1 knots at 04:18 pm Sunday.
PZZ500 859 Pm Pdt Sat Jul 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will shift to the northwest as a thermal trough extends towards the central coast of california. Winds will begin to decrease for most of the coastal waters. The northern outer waters, however, will remain gusty through the weekend.

7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 230554
afdmtr
area forecast discussion
national weather service san francisco bay area
1054 pm pdt Sat jul 22 2017

Synopsis Temperatures will begin to moderate on Sunday as a
weak upper level trough begins to develop off our coast. A more
pronounced cooling trend appears on tap for the first part of next
week, with a deepening marine layer and increased onshore flow.

But then by the latter part of the week, high pressure looks to
build back in again resulting in a return to warming temperatures.

Aside from some possible coastal drizzle, no precipitation is
presently expected in our area through the forecast period.

Discussion As of 9:00 pm pdt Saturday... Warming occurred at
nearly all locations throughout our forecast area today as high
pressure aloft strengthened over california. The sharpest increase
in temperatures occurred in the east bay valleys and locally
across interior portions of san mateo county. In these areas highs
today were as much as 15 degrees above those of yesterday. A few
locations in the east bay reached 100 this afternoon, as well as
several locations across interior monterey county and san benito
county.

A cooling trend will get underway on Sunday for much of our
forecast area, as high pressure aloft begins to retreat to the
east and a weak upper low develops off the northern california
coast. Winds aloft have already turned southerly, and surface
winds are also expected to gradually shift to the south by Sunday,
and then increase on Monday as a surface low develops just off
the coast of the north bay. Cooling on Sunday will be most
pronounced in areas that have greatest exposure to marine air
influence under southerly flow (e.G., north bay valleys, big sur
coast, santa cruz). Valleys farthest inland and locations in the
hills above 1000 feet will remain very warm on Sunday and
experience only slight cooling. Cooling will spread farther inland
and to higher elevations on Monday as the marine layer deepens.

Meanwhile, locations with terrain to the south (e.G., monterey,
san jose) will see less cooling the next few days due to downslope
warming effects.

Low clouds had cleared from the coast from monterey bay northward
by early evening. Skies are currently mostly clear except for a
band of high clouds moving from south to north through the bay
area. Models indicate that low clouds and patchy fog will develop
along much of our coastline by late tonight, but clouds fog
should mostly remain confined to coastal areas. Then, as the
marine layer deepens by Sunday night, low clouds will begin to
develop farther inland.

Mid and upper level moisture to our south is forecast to advance
northward over the next 24 hours. However, the flow aloft is
expected to have enough of a westerly component over our area to
deflect the bulk of this moisture to our east. Therefore, there is
virtually no chance that high-based convection will develop in
our area anytime soon, except for a very slim chance in the far
southeastern portion of our forecast area.

Temperatures for most inland areas are expected to be slightly
cooler than normal for Monday and Tuesday. By midweek the upper
low near the northern california coast is forecast to move off to
our east, allowing upper level ridging to once again strengthen
over our area. This will mean a warming trend for most areas
during the second half of the week.

Tropical storm hillary has recently developed off the southwest
coast of mexico. This storm is forecast to track to the northwest
and, according to some GFS ensemble members (and operational 18z
gfs), remnants of this tropical system may end up approaching the
california coast by day 10.

Aviation As of 10:30 pm pdt Saturday... Upper level high over
the southwestern us extending to california brought a very warm
airmass to the district. The marine layer is shallow at around
1000 feet. The east-west component of the onshore gradient is
weaker than yesterday. As a result stratus is expected to be
confined to the coastal areas with little inland penetration
except through the golden gate to oak. Clouds in northern mry bay
expected to spread into southern mry bay 08-10z.

Vicinity of ksfo...VFR. West winds to 15 kt through 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Ifr for CIGS vsby after 08-10z
clearing by 17z.

Marine As of 10:45 pm pdt Saturday... High pressure over the
eastern pacific will shift to the northwest as a thermal trough
extends towards the central coast of california. Winds will begin
to decrease for most of the coastal waters. The northern outer
waters, however, will remain gusty through the weekend.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay until 11 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
public forecast: dykema
aviation: W pi
marine: W pi S sims
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 13 mi49 min Calm G 6 56°F 56°F1011.6 hPa
46237 - San Francisco Bar, CA (142) 13 mi67 min 54°F3 ft
PXSC1 14 mi49 min 60°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi49 min W 4.1 G 5.1 60°F 1010 hPa
AAMC1 - 9414750 - Alameda, CA 15 mi49 min WNW 2.9 G 5.1 63°F 66°F1011.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi49 min NW 2.9 G 2.9
OBXC1 16 mi49 min 60°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi49 min WNW 7 G 7 60°F 1011 hPa
LNDC1 17 mi49 min N 4.1 G 6 63°F 1011 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi49 min NW 5.1 G 5.1 66°F 73°F1010.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi47 min W 5.8 G 5.8 55°F 55°F4 ft1011.3 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi49 min SSW 13 G 17 58°F 1011.1 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi49 min S 7 G 11 59°F 63°F1010.6 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 26 mi47 min WNW 9.7 G 12 57°F 57°F4 ft1011.1 hPa (-0.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi49 min SSW 2.9 G 8 67°F 1009.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi49 min WNW 8.9 G 9.9 68°F 69°F1010.2 hPa56°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi49 min NNW 1 G 2.9 59°F 52°F1010.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi49 min WSW 8.9 G 11 69°F 72°F1009.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi49 min W 6 G 9.9 80°F 1008.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi112 min W 5.1 69°F 1009 hPa56°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA8 mi42 minN 07.00 miOvercast50°F48°F94%1010.8 hPa
San Francisco, San Francisco International Airport, CA8 mi41 minWNW 810.00 miFair59°F53°F81%1010.8 hPa
San Carlos Airport, CA15 mi47 minN 310.00 miFair64°F57°F78%1011.2 hPa
Oakland, Metro Oakland International Airport, CA16 mi44 minWNW 710.00 miFair64°F57°F78%1010.8 hPa
Hayward, Hayward Air Terminal, CA21 mi43 minWNW 410.00 miFair65°F51°F61%1011.5 hPa
Palo Alto Airport, CA23 mi4.8 hrsNW 810.00 miA Few Clouds68°F60°F78%1010.5 hPa

Wind History from HAF (wind in knots)
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Last 24hrCalmS4S6SE7SE8SE9SE10S13S12S11S11S11S9S8S7S6SW4W3NW6CalmCalmCalmCalmCalm
1 day agoNW10
G15
N3NW3NW4NW7NW6NW6NW5NW6W8NW11NW11NW13NW12
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2 days agoNW5NW6NW7NW6NW9NW5NW7NW7NW9NW10NW8NW9--NW10
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Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Sun -- 12:02 AM PDT     8.44 feet High Tide
Sun -- 02:47 AM PDT     New Moon
Sun -- 06:06 AM PDT     Sunrise
Sun -- 06:27 AM PDT     Moonrise
Sun -- 07:07 AM PDT     -1.36 feet Low Tide
Sun -- 01:56 PM PDT     6.73 feet High Tide
Sun -- 07:01 PM PDT     2.23 feet Low Tide
Sun -- 08:25 PM PDT     Sunset
Sun -- 08:47 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.48.16.84.82.60.6-0.8-1.3-10.11.63.45.16.36.76.25.13.72.62.22.63.85.36.8

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Sun -- 12:26 AM PDT     -0.00 knots Slack
Sun -- 02:47 AM PDT     New Moon
Sun -- 04:00 AM PDT     -1.77 knots Max Ebb
Sun -- 06:06 AM PDT     Sunrise
Sun -- 06:26 AM PDT     Moonrise
Sun -- 07:23 AM PDT     0.00 knots Slack
Sun -- 10:38 AM PDT     1.42 knots Max Flood
Sun -- 01:59 PM PDT     -0.01 knots Slack
Sun -- 04:37 PM PDT     -0.93 knots Max Ebb
Sun -- 07:18 PM PDT     0.01 knots Slack
Sun -- 08:25 PM PDT     Sunset
Sun -- 08:47 PM PDT     Moonset
Sun -- 10:21 PM PDT     1.08 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.4-1.1-1.6-1.8-1.6-1.1-0.30.411.41.41.20.7-0-0.6-0.9-0.9-0.6-0.20.40.81.11

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 (4,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.