Tuesday, January16, 2018 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 7:21AMSunset 5:18PM Tuesday January 16, 2018 8:46 PM PST (04:46 UTC) Moonrise 7:02AMMoonset 5:14PM Illumination 0% Phase: New Moon; Moon at 0 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- 255 Pm Pst Tue Jan 16 2018
.small craft advisory for rough bar now in effect until 9 pm pst Wednesday...
Tonight..N winds 10 kt. Wind waves 2 ft or less. W swell 10 to 13 ft at 15 seconds.
Wed..SW winds 10 kt. Wind waves 2 ft or less. W swell 9 to 11 ft at 15 seconds.
Wed night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 14 seconds. Slight chance of rain after midnight.
Thu..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 14 to 17 ft at 21 seconds. Rain likely in the morning, then chance of rain in the afternoon.
Thu night..W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 16 to 19 ft at 18 seconds. Chance of showers.
Fri..NW winds 20 to 30 kt. Wind waves 3 to 5 ft. W swell 14 to 17 ft. Chance of showers, then slight chance of showers.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 12 to 15 ft. Slight chance of rain.
Sun..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft. Rain likely.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 10 to 13 ft at 16 seconds. Across the bar...combined seas 13 to 16 ft at 16 seconds. Maximum ebb current of 2.8 knots at 03:43 pm Tuesday and 1.4 knots at 04:49 am Wednesday.
PZZ500 255 Pm Pst Tue Jan 16 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northerly winds will prevail tonight as high pressure remains off the coast. Southerly winds will develop late tonight and Wednesday as a low pressure system develops off the british columbia coast. Large swells will impact the beaches through early tonight before decreasing. A larger swell with long period will arrive Thursday.

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 170130
afdmtr
area forecast discussion
national weather service san francisco bay area
530 pm pst Tue jan 16 2018

Synopsis Mostly cloudy and mainly dry conditions are forecast to
persist into Wednesday ahead of our next approaching storm system.

This system will bring rain to the region late Wednesday into
Thursday with lingering post frontal showers. Cooler temperatures
are forecast over the weekend with dry weather for much of the
region before another system arrives late Sunday or Monday.

Discussion As of 01:52 pm pst Tuesday... Light rain continues
to be reported over the north bay this afternoon, generally only a
few hundredths of an inch per hour. Otherwise, cloudy skies
prevail region-wide in wake of a weak system that pushed through
during the past 24 hours. Generally dry conditions will prevail
tonight with any precipitation forecast to stay north of the
region. Little change is anticipated for Wednesday with much of
the region dry and temperatures in the upper 50s across the
northern half of the region while lower 70s are possible for
interior portions of the central coast.

Light rain will develop late Wednesday over the north bay as another
weak system approaches from the north. This system does appear to
produce a bit more precipitation than the one that moved through
last night today. However, it too will be quick moving and result in
rainfall amounts of 1 3" to 1 5" for the north bay with isolated
amounts near 1.00" in the coastal ranges of that region. To the
south, most urban areas will see less than 1 3" with even less than
1 4" for the monterey bay region and inland valleys. Coastal ranges
along the central coast can expect around 1 4" to 1 3" with isolated
amounts up to 1 2" through Thursday. Post frontal showers are then
expected late Thursday into Friday as a more unstable and colder air
mass advects southward into the region. At this point, snow levels
are forecast to drop to or below 3,500 feet with light snow
accumulation possible in the highest peaks across the region. Also
cannot rule out a thunderstorm or two over the northern coastal
waters Thursday night into Friday.

With the colder air mass in place, overnight morning temperatures
are likely to fall into the 30s and lower 40s for most urban areas.

While widespread freezing conditions are unlikely, these conditions
may impact pets and vulnerable populations. Mostly dry conditions
expected for Saturday outside of light rain possible across the
north bay ahead of our next storm system.

There continues to be difference and inconsistencies in the medium
range forecast models with respect to the next system due to arrive
Sunday into Monday. The latest ECMWF has trended much drier with a
more progressive system sweeping through. The GFS remains a bit
wetter, yet too moves the system through from north to south Sunday
night into Monday. The canadian solution stalls the system over
northern california Sunday night into Monday before dropping
southward and weakening on Tuesday. Thus, will keep rain chances in
the extended with low confidence on details at this time.

Aviation As of 5:29 pm pst Tuesday... Areas of ifr CIGS otherwise
metar observations indicateVFR late this afternoon. Cooler, moist
air from the surface to the 925 mb level continues to slide in from
the northwest tonight and Wednesday while a warm front located approx
400 miles west of the bay area will reach our coastal waters Wednesday
evening. Inherited tafs detail things very well, with forecast parameters
mostly following persistence for tonight. Along the immediate coastline
cigs may lower a little late tonight into Wednesday, will keep a close
watch on it. Areas ifr CIGS and visibilities in fog and haze are forecast
tonight. Winds mainly nw-ne 5-10 knots.

Vicinity of ksfo... MVFR tonight, some lowering of confidence late
tonight and Wednesday morning as visibilities and CIGS could at
least go briefly ifr.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Fairly confidentVFR will continue this
evening. Will keep a close watch on possible cig development for
late tonight Wednesday morning, for now things look good withVFR.

Marine As of 3:54 pm pst Tuesday... Northerly winds will prevail
tonight as high pressure remains off the coast. Southerly winds
will develop late tonight and Wednesday as a low pressure system
develops off the british columbia coast. Large swells will impact
the beaches through early tonight before decreasing. A larger
swell with long period will arrive Thursday.

Mtr watches warnings advisories
Tngt Sca... Rough bar advisory for sf bar
public forecast: rgass
aviation: canepa
marine: mm
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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 mi46 min N 8 G 8.9 56°F 54°F1023.3 hPa (+0.3)
46237 - San Francisco Bar, CA (142) 13 mi46 min 54°F11 ft
PXSC1 14 mi46 min 56°F 56°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi46 min W 2.9 G 6 56°F 1022.2 hPa (+0.5)
AAMC1 - 9414750 - Alameda, CA 15 mi46 min NNW 1 G 1.9 56°F 55°F1023.2 hPa (+0.5)
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi46 min NW 5.1 G 6 54°F 1023.1 hPa (+0.4)
OBXC1 16 mi46 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi46 min NW 5.1 G 5.1
LNDC1 17 mi46 min NNW 4.1 G 5.1 57°F 1023.1 hPa (+0.6)
RTYC1 - 9414523 - Redwood City, CA 18 mi46 min WNW 4.1 G 6 56°F 56°F1023.4 hPa (+0.5)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi62 min WNW 1.9 55°F 1023 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi56 min NW 5.8 G 9.7 54°F 54°F12 ft1023.1 hPa (+0.5)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi52 min N 1.9 G 2.9 58°F 1023.4 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi46 min NW 5.1 G 6 55°F 53°F1022.9 hPa (-0.0)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 26 mi56 min NNW 5.8 G 7.8 54°F 57°F13 ft1022.5 hPa (+0.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi52 min E 7 G 7 55°F 1023 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi46 min N 2.9 G 2.9 53°F 52°F1023.8 hPa (+0.7)53°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi46 min Calm G 1 55°F1022.7 hPa (+0.4)
PCOC1 - 9415144 - Port Chicago, CA 39 mi46 min NNW 1.9 G 1.9 53°F 52°F1023.6 hPa (+0.7)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi52 min SE 1.9 G 1.9 53°F 1023.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi61 min Calm 50°F 1023 hPa50°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 mi51 minSSE 41.50 miFog/Mist54°F53°F100%1022 hPa
San Francisco, San Francisco International Airport, CA8 mi1.8 hrsNNE 510.00 miOvercast56°F53°F90%1022.5 hPa
San Carlos Airport, CA15 mi59 minNW 510.00 miOvercast57°F53°F88%1023 hPa
Oakland, Metro Oakland International Airport, CA16 mi53 minN 09.00 miOvercast56°F54°F93%1023.2 hPa
Hayward, Hayward Air Terminal, CA21 mi52 minNE 58.00 miFair57°F50°F78%1024 hPa
Palo Alto Airport, CA23 mi59 minN 08.00 miPartly Cloudy57°F55°F94%1023 hPa

Wind History from HAF (wind in knots)
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Last 24hrSE4S3SE4SE4SE4SE5S3S3CalmSE3CalmS4CalmCalmW4CalmNW3NW4NW5CalmNW4NW6NW3Calm
1 day agoS11NW8N4CalmCalmNE4CalmCalmCalmCalmCalmN3CalmSE7S8S6SE8S6SE4SE6SE6SE4SE6SE6
2 days agoNE3CalmCalmNW4CalmCalmCalmNW3CalmCalmNE3CalmNW6CalmS4W4W7S3CalmSE3CalmNE3CalmCalm

Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Tue -- 12:46 AM PST     6.16 feet High Tide
Tue -- 05:39 AM PST     2.92 feet Low Tide
Tue -- 07:00 AM PST     Moonrise
Tue -- 07:22 AM PST     Sunrise
Tue -- 11:14 AM PST     7.53 feet High Tide
Tue -- 05:13 PM PST     Moonset
Tue -- 05:16 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 06:24 PM PST     -0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.96.15.74.73.73.133.54.55.86.97.57.36.553.21.50.2-0.4-0.30.51.73.14.5

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
Tue -- 12:37 AM PST     -0.01 knots Slack
Tue -- 03:02 AM PST     -0.60 knots Max Ebb
Tue -- 05:47 AM PST     0.00 knots Slack
Tue -- 07:00 AM PST     Moonrise
Tue -- 07:23 AM PST     Sunrise
Tue -- 08:44 AM PST     0.75 knots Max Flood
Tue -- 11:37 AM PST     -0.00 knots Slack
Tue -- 03:08 PM PST     -1.37 knots Max Ebb
Tue -- 05:13 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 06:41 PM PST     0.01 knots Slack
Tue -- 09:53 PM PST     1.03 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.2-0.5-0.6-0.5-0.30.10.40.70.70.60.3-0.2-0.7-1.2-1.4-1.3-0.9-0.40.20.7110.9

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 (23,6,7,8)
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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.