Friday, October20, 2017 L-36.com


Marine Weather and Tides
Millbrae, 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 7:22AMSunset 6:25PM Friday October 20, 2017 5:38 AM PDT (12:38 UTC) Moonrise 7:07AMMoonset 6:23PM 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- 237 Am Pdt Fri Oct 20 2017
.small craft advisory for rough bar in effect through Saturday morning...
.small craft advisory in effect through Saturday morning...
Today..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 12 to 15 ft at 17 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 12 to 15 ft at 16 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 9 to 12 ft at 15 seconds.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 14 seconds.
Sun..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 7 to 9 ft at 12 seconds. SWell S 3 ft.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft. SWell S 3 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 6 to 8 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 10 to 15 ft with a dominant swell period of 17 seconds. Across the bar...combined seas 10 to 15 ft with a dominant swell period of 17 seconds. Breakers over 20 feet possible. Maximum ebb current of 1.2 knots at 3:48 am Friday and 1.7 knots at 4:12 pm Friday.
PZZ500 237 Am Pdt Fri Oct 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwesterly winds will persist in the wake of a cold front that is passing through the coastal waters tonight. A long period northwesterly swell will accompany this system creating hazardous seas for mariners operating small crafts. Mariners are urged to use extreme caution if out at sea as hazardous seas are forecast to persist over the next few days.

7 Day Forecast for Marine Location Near Millbrae, CA
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location: 37.58, -122.39     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 201229
afdmtr
area forecast discussion
national weather service san francisco bay area
529 am pdt Fri oct 20 2017

Synopsis Showers to decrease and move out of the area this
morning. Cooler temperatures and brisk onshore winds will persist
today. Dry weather is then expected through the remainder of the
forecast period. A warming trend will begin during the weekend
and continue into next week. Temperatures are forecast to be well
above average through most of next week.

Discussion As of 3:05 am pdt Friday... The early-season storm
was slow to arrive in our area yesterday, but once it did, it
moved through quickly. Rain began in the north bay last evening,
and spread into the san francisco bay area right after 11 pm with
the frontal system moving quickly to the south and east. Brief
heavy rain reached the weather office in monterey after 1:30 am,
with winds shifting to the west and briefly gusting to over 30
mph. Latest radar scans show the main rain band has now moved
south of san jose with rainfall having ended across most of the
san francisco bay area. Rainfall totals have ranged from under a
tenth of an inch to over three quarters of an inch, with the
highest amounts falling in the north bay. The largest amount seen
was middle peak raws site in marin county which topped out at
0.90".

Showers will continue to taper off, with some rain still expected
across the southern portions of monterey and san benito counties
through mid morning. Breezy conditions to persist through the day
with strong onshore winds in the 15 to 25 mph range, with higher
gusts possible. High temps today will be on the cool side - 50s
and 60s most areas.

A warming trend will begin during the weekend as an upper level
ridge builds over the state. Much warmer temperatures are then
forecast early in the work week as the upper ridge strengthens
along the west coast and light offshore flow develops. On Monday
and Tuesday expect widespread high temperatures in the 80s to
around 90, with these warm temperatures developing not only
inland, but in coastal areas as well. Slight cooling is projected
late in the week as the ridge begins to weaken.

Aviation As of 5:10 am pdt Friday... For 12z tafs. Colder and
drier air filter in on the backside of the frontal boundary has
resulted in mostly clear skies with only patches of low clouds
this morning. Temporary CIGS possible between now and sunrise with
rapid clearing expected this morning. Winds anticipated to veer
increasingly to the west with speeds increasing this afternoon to
around 10-15 kt with gusts around 20-25 kt.

Overall forecast confidence: moderate to high
vicinity of ksfo... .MVFR CIGS will scatter out relatively fast
this morning as a drier airmass settles into the region.VFR
conditions expected through the remainder of the forecast period.

West winds will gradually increase to around 15 kt this afternoon
with gust to around 25 kt possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions anticipated to persist
through the remainder of the forecast period. Light winds will
veer increasingly to the west with speeds increasing this
afternoon to around 10-15 kt with gusts around 20 kt possible.

Fire weather As of 3:05 am pdt Friday... Rainfall which moved
across the district overnight brought wetting rains to many
locations. Highest rainfall amounts were in the north bay
mountains, but many locations at lower elevations received around
a quarter of an inch. Rainfall should end in most areas by mid
morning. Today will be a cool day with brisk northwest winds.

A warming trend will get underway during the weekend as a high
pressure ridge begins to build over california. This ridge will
strengthen into early next week and result in warm and dry
conditions districtwide from Monday through Wednesday. Will need
to be wary of possible gusty offshore winds in the hills beginning
late in the weekend and continuing into Monday night.

Marine As of 2:37 am pdt Friday... Moderate northwesterly winds
will persist in the wake of a cold front that is passing through
the coastal waters tonight. A long period northwesterly swell
will accompany this system creating hazardous seas for mariners
operating small crafts. Mariners are urged to use extreme caution
if out at sea as hazardous seas are forecast to persist over the
next few days.

Mtr watches warnings advisories
Tday High surf advisory... Caz006-505-509-529-530
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Mry bay
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Rough bar advisory for sf bar
public forecast: sims
aviation marine: cw
fire weather: sims
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi51 min W 6 G 8 55°F 65°F1015.7 hPa
AAMC1 - 9414750 - Alameda, CA 14 mi51 min WNW 5.1 G 8 56°F 62°F1016.4 hPa
PXSC1 15 mi51 min 56°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi51 min WNW 8.9 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi51 min WNW 7 G 8.9 56°F 1016 hPa
OBXC1 16 mi51 min 56°F 53°F
LNDC1 16 mi51 min NNE 2.9 G 6 55°F 1016 hPa
FTPC1 - 9414290 - San Francisco, CA 16 mi57 min W 2.9 G 5.1 54°F 57°F1016.2 hPa
46237 - San Francisco Bar, CA (142) 19 mi69 min 55°F12 ft
RCMC1 - 9414863 - Richmond, CA 24 mi57 min WNW 6 G 8.9 56°F 59°F1015.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi49 min W 5.8 G 7.8 55°F 55°F13 ft1015.8 hPa (+2.0)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi49 min WNW 14 G 19 58°F 59°F17 ft1015.5 hPa (+1.4)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi51 min NNW 6 G 7 54°F 62°F1016.3 hPa54°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi51 min W 8.9 G 9.9 55°F 62°F1016 hPa
PRYC1 - 9415020 - Point Reyes, CA 42 mi51 min WSW 1.9 G 4.1 54°F1015.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi114 min WNW 7 52°F 1014 hPa50°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi43 minW 1010.00 miPartly Cloudy55°F51°F87%1016.1 hPa
Half Moon Bay Airport, CA8 mi44 minN 04.00 miFog/Mist54°F51°F94%1015.6 hPa
San Carlos Airport, CA8 mi44 minW 410.00 miFair54°F50°F88%1016.6 hPa
Oakland, Metro Oakland International Airport, CA12 mi46 minN 310.00 miMostly Cloudy53°F52°F96%1016.4 hPa
Hayward, Hayward Air Terminal, CA15 mi45 minNE 410.00 miMostly Cloudy55°F48°F80%1017.3 hPa
Mountain View, Moffett Field, CA21 mi43 minN 010.00 miFair54°F50°F87%1017.1 hPa

Wind History from SFO (wind in knots)
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Last 24hrW3W5W3SW4SW4SW5NW6SW11W13
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1 day agoW7W4CalmS5CalmE3E4N5NW14W19W21W17W17W15W12W6W10W11
G15
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2 days agoCalmS3CalmN3CalmE4N3NE4NW8NW8NW13NW14NW15NW12NW12W11W13W12W11NW14NW12W6W6W7

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Fri -- 01:26 AM PDT     6.74 feet High Tide
Fri -- 07:13 AM PDT     1.45 feet Low Tide
Fri -- 07:22 AM PDT     Sunrise
Fri -- 08:06 AM PDT     Moonrise
Fri -- 01:15 PM PDT     7.51 feet High Tide
Fri -- 06:24 PM PDT     Sunset
Fri -- 07:23 PM PDT     Moonset
Fri -- 07:50 PM PDT     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.96.76.65.84.53.221.51.72.74.15.66.97.57.36.24.72.91.40.300.61.83.3

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Fri -- 01:53 AM PDT     -0.01 knots Slack
Fri -- 04:55 AM PDT     -1.30 knots Max Ebb
Fri -- 07:22 AM PDT     Sunrise
Fri -- 07:50 AM PDT     0.00 knots Slack
Fri -- 08:06 AM PDT     Moonrise
Fri -- 10:44 AM PDT     0.94 knots Max Flood
Fri -- 01:41 PM PDT     -0.00 knots Slack
Fri -- 05:08 PM PDT     -1.74 knots Max Ebb
Fri -- 06:24 PM PDT     Sunset
Fri -- 07:23 PM PDT     Moonset
Fri -- 08:21 PM PDT     0.01 knots Slack
Fri -- 11:25 PM PDT     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.5-0.1-0.8-1.2-1.3-1.1-0.60.10.60.90.90.80.4-0.2-1-1.5-1.7-1.6-1.1-0.30.40.81.1

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 (8,2,3,4)
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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.