Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Millbrae, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:52AMSunset 8:20PM Wednesday May 23, 2018 8:11 AM PDT (15:11 UTC) Moonrise 1:35PMMoonset 1:51AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 231 Am Pdt Wed May 23 2018
Today..SW winds around 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft at 10 seconds and sw 3 to 4 ft at 17 seconds. Areas of drizzle in the morning.
Tonight..W winds around 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 12 seconds and sw 3 to 4 ft at 16 seconds.
Thu..S winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 5 ft at 12 seconds and sw 3 to 4 ft at 16 seconds.
Thu night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 5 ft at 12 seconds and sw 3 ft at 16 seconds. Chance of showers after midnight.
Fri..E winds 5 to 15 kt...becoming nw. Wind waves 3 to 4 ft. W swell 4 to 6 ft at 11 seconds and sw 3 ft at 14 seconds. Slight chance of showers in the morning, then chance of showers in the afternoon. Slight chance of showers in the evening.
Sat..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 3 to 5 ft and sw 3 ft...decreasing to 3 ft.
Sun..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell around 3 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant period of 11 seconds. Across the bar...combined seas 4 to 6 ft with a dominant period of 11 seconds. Maximum ebb current of 2.2 knots at 11:07 am Wednesday and 2.5 knots at 12:25 am Thursday.
PZZ500 231 Am Pdt Wed May 23 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwest winds will prevail through midweek for the coastal waters. Winds are expected to increase through the golden gate gap, around angel island, and in the west delta by mid morning into mid afternoon today. Thus, a small craft advisory is in place for the northern san francisco bay and west delta for persistent wind gusts over 20 knots. By Thursday morning, winds are forecast to turn southerly as a weak low pressure system approaches from the west. This low will bring a chance of showers Thursday and Friday. Long period southwest swell will persist with a shorter period northwest swell through the week, decreasing by Friday.

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 231144
afdmtr
area forecast discussion
national weather service san francisco bay area
444 am pdt Wed may 23 2018

Synopsis Cool weather and morning low clouds will continue
through most of the week with inland temperatures remaining below
normal for this time of year as a deep marine layer continues to
influence the region. An upper level low will move through the
area late Thursday into Friday bringing a chance of showers to
most of the area. Showers will end by Saturday morning before a
warming trend brings inland temperatures back to near seasonal
normals by Sunday.

Discussion As of 3:10 am pdt Wednesday... Deep marine layer
near 3000 feet and strong east-west onshore flow has allowed
stratus to spread well inland this morning. Many places around the
cwa are reporting measurable drizzle. An upper level low over
nevada will move slowly NE today with a weak transient ridge
moving over the state later today. This may compress the marine
layer a little bit but temperatures will still be cool with inland
temperatures remaining 5 to 10 degrees below normal. Another
breezy day is expected due to the persistently strong onshore
flow.

Cool temperatures continue the rest of the week as another upper
low is approaching from the west. Models in agreement in moving
this low through the bay area late Thursday and Friday. A frontal
system is forecast to dissipate as it nears the coast precip but
there will be a chance of showers in the sfo bay area Thursday
night through Friday afternoon with a slight chance of showers
south of there. Coastal low clouds should finally mix out on
Friday.

The low moves through Friday night and shower chances diminish.

A warming trend takes place this weekend as upper level ridge
builds off the california and oregon coast. Temperatures should
return to near normal conditions by Sunday or memorial day. There
may even be some offshore flow as a surface ridge builds into the
washington and oregon coast.

Aviation As of 4:44 am pdt Wednesday for 12z tafs... Fog
product satellite shows a very robust, deep marine layer in place
across the region. Fort ord profiler detects the layer to be about
or slightly above 3000 feet deep. Latest surface obs show cig
heights generally around 1000-1800 ft, locally lower at some
terminals. Confidence is relatively low on how this thick marine
layer will play out through the morning. The latest mtrwrf has
various clearing times through late morning or early afternoon,
with not much clearing or no clearing at all along the immediate
coast. Expect another early arrival of MVFR ifr CIGS this evening.

Onshore winds will continue today, though not expected to be as
breezy as past few days as the sfo-sac pressure gradient continues
to decrease.

Overall forecast confidence: low-moderate
vicinity of ksfo... CIGS are holding strong around 2000 feet above
the terminal. Anticipate clearing around 19z, but confidence is
relatively low, with MVFR CIGS returning as early as 02z. Winds
will increase this afternoon to around 15 kt with occasional
higher gusts possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR with intermittent ifr CIGS through
the morning. Temporary clearing possible by 19z, but very low
confidence, especially at kmry. West winds will increasing this
afternoon to around 10 to 15 kt.

Marine As of 2:30 am pdt Wednesday... Light northwest winds
will prevail through midweek for the coastal waters. Winds are
expected to increase through the golden gate gap, around angel
island, and in the west delta by mid morning into mid afternoon
today. Thus, a small craft advisory is in place for the northern
san francisco bay and west delta for persistent wind gusts over 20
knots. By Thursday morning, winds are forecast to turn southerly
as a weak low pressure system approaches from the west. This low
will bring a chance of showers Thursday and Friday. Long period
southwest swell will persist with a shorter period northwest swell
through the week, decreasing by Friday.

Mtr watches warnings advisories
Tday Sca... Sf bay from 9 am until 3 pm
public forecast: W pi
aviation marine: bam
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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 mi41 min WSW 5.1 G 8 55°F 64°F1014.4 hPa
AAMC1 - 9414750 - Alameda, CA 14 mi47 min WSW 5.1 G 8 54°F 62°F1013.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi41 min WSW 2.9 G 7 54°F 1012.7 hPa
PXSC1 15 mi47 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi47 min SW 8 G 8.9
OBXC1 16 mi41 min 55°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi41 min WSW 5.1 G 8 54°F 1013.8 hPa
FTPC1 - 9414290 - San Francisco, CA 16 mi47 min SW 4.1 G 7 53°F 55°F1013.9 hPa
LNDC1 16 mi41 min SW 7 G 8.9 54°F 1013.7 hPa
46237 - San Francisco Bar, CA (142) 19 mi41 min 54°F4 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi41 min SSW 8.9 G 11 55°F 1013.8 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi47 min SW 4.1 G 7 55°F 59°F1013.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi31 min WSW 7.8 G 9.7 52°F 51°F1014.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi81 min W 9.7 G 12 53°F 54°F5 ft1013.5 hPa (+0.7)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi41 min SW 9.9 G 13 56°F 1012.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi41 min 64°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi41 min WSW 12 G 16 56°F 64°F1012.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi41 min W 7 G 12 56°F 1012.5 hPa
PRYC1 - 9415020 - Point Reyes, CA 42 mi47 min W 6 G 7 50°F1013.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi86 min W 9.9 55°F 1012 hPa51°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 mi15 minSW 510.00 miOvercast56°F51°F84%1013.9 hPa
Half Moon Bay Airport, CA8 mi16 minW 65.00 miFog/Mist54°F51°F94%1014.6 hPa
San Carlos Airport, CA8 mi21 minN 010.00 miOvercast55°F50°F82%1014.2 hPa
Oakland, Metro Oakland International Airport, CA12 mi18 minWSW 115.00 miLight Rain Fog/Mist55°F53°F93%1014.1 hPa
Hayward, Hayward Air Terminal, CA15 mi17 minSW 710.00 miOvercast55°F50°F83%1014.9 hPa
Palo Alto Airport, CA16 mi24 minVar 410.00 miMostly Cloudy0°F0°F%1014.2 hPa
Mountain View, Moffett Field, CA21 mi75 minVar 410.00 miOvercast57°F48°F74%1014 hPa

Wind History from SFO (wind in knots)
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Last 24hrW8SW9SW9SW10W10W11W14SW13W15W14W12W11W11W8SW6SW7SW6SW6SW5SW4W6W5SW4SW4
1 day agoCalmN3NE444W16
G24
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W21W22
G29
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W12W13SW10
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2 days agoW17
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W17W15W10SW7S4W4SW3S3

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
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Wed -- 02:18 AM PDT     1.79 feet Low Tide
Wed -- 02:50 AM PDT     Moonset
Wed -- 05:53 AM PDT     Sunrise
Wed -- 07:57 AM PDT     5.89 feet High Tide
Wed -- 02:28 PM PDT     0.11 feet Low Tide
Wed -- 02:34 PM PDT     Moonrise
Wed -- 08:18 PM PDT     Sunset
Wed -- 09:10 PM PDT     7.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.52.41.822.73.74.85.65.95.54.63.320.90.20.212.33.85.46.77.276

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
Wed -- 02:50 AM PDT     Moonset
Wed -- 03:00 AM PDT     0.00 knots Slack
Wed -- 05:51 AM PDT     0.67 knots Max Flood
Wed -- 05:53 AM PDT     Sunrise
Wed -- 08:33 AM PDT     -0.00 knots Slack
Wed -- 11:58 AM PDT     -1.32 knots Max Ebb
Wed -- 02:34 PM PDT     Moonrise
Wed -- 03:09 PM PDT     0.01 knots Slack
Wed -- 06:29 PM PDT     1.03 knots Max Flood
Wed -- 08:18 PM PDT     Sunset
Wed -- 09:33 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.1-1-0.6-00.40.60.70.60.3-0.3-0.8-1.2-1.3-1.2-0.8-0.10.40.8110.80.3-0.3-0.9

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (11,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.