Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Emerald Lake Hills, 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 5:53AMSunset 8:17PM Sunday May 20, 2018 6:09 PM PDT (01:09 UTC) Moonrise 10:16AMMoonset 12:00AM Illumination 36% Phase: Waxing Crescent; Moon at 6 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 241 Pm Pdt Sun May 20 2018
.small craft advisory in effect through late Monday night...
Tonight..NW winds 20 to 30 kt. Wind waves 5 to 8 ft. W swell around 3 ft at 11 seconds. Patchy drizzle after midnight.
Mon..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft. W swell 3 to 4 ft at 11 seconds.
Mon night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft. W swell 4 to 5 ft at 10 seconds and sw around 3 ft at 21 seconds.
Tue..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell around 5 ft at 10 seconds and sw around 3 ft at 20 seconds.
Tue night..W winds 5 to 15 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 10 seconds and sw around 3 ft at 19 seconds.
Wed..SW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft and sw 3 to 4 ft.
Wed night..W winds up to 10 kt. Wind waves 2 ft or less. Mixed swell nw around 4 ft and sw 3 to 4 ft.
Thu..SW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft and sw 3 to 4 ft.
Fri..SW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft and sw around 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant period of 12 seconds. Across the bar...combined seas 4 to 6 ft with a dominant period of 12 seconds. Maximum ebb current of 1.4 knots at 09:07 pm Sunday and 3 knots at 08:07 am Monday.
PZZ500 241 Pm Pdt Sun May 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to strong northwesterly winds will persist over the coastal waters through Monday in response to a tight north to south pressure gradient along the coast. These winds will result in steep wind waves as well and produce hazardous conditions for small crafts. A long period southerly swell will increase and mix with northwesterly swell by Monday morning, gradually increasing through much of the week.

7 Day Forecast for Marine Location Near Emerald Lake Hills, CA
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location: 37.44, -122.34     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 202348
afdmtr
area forecast discussion
national weather service san francisco bay area
448 pm pdt Sun may 20 2018

Synopsis Upper low over california will keep temperatures below
normal at least through Tuesday. Weak ridge builds around midweek
with temperatures near normal before another trough approaches
Friday through Sunday with onshore winds keeping temperatures on
the cool side of normal while mainly dry conditions are forecast.

Discussion As of 1:42 pm pdt Sunday... Below normal
temperatures and breezy onshore winds continue to be the main
forecast trend. So far this afternoon temps generally running from
the upper 50s beaches, 60s around the bay and 70s well inland.

Cloud decks are around 2500 feet deep along the coast due to an
upper low over the region. The ben lomond raws up in the santa
cruz mountains is sitting in the cloud layer and so far reporting
a high of only 49 degrees so far this afternoon. Onshore gradient
of 2.5 mb from sfo to sac is pushing some gusty winds from the
golden gate out into the delta with sfo gusting to 33 mph last
hour.

Looking forward the last few NAM runs have generated some coastal
drizzle tonight with cyclonic flow aloft and moist onshore flow
lifting the boundary layer. Coastal hills from san mateo southward
to monterey that are exposed to NW winds off the ocean is where
the modeling is showing some measurable drizzle type QPF that
should it develop will be localized.

Main forecast theme to start the work week will be continued below
normal temps and breezy onshore winds. The north bay may see the
most sunshine on Monday with drier north northeast flow around
the upper low. MOS data showing 79 degrees for santa rosa on
Monday while most cities around the bay will see 60s once again
with some lower 70s for the santa clara valley.

The upper low slowly ejects inland by Tuesday but a deep marine
layer and onshore flow will likely remain in its wake with
continued trend of below normal temps and onshore breezes.

Some weak ridging or zonal type flow develops weds afternoon into
Thursday sending temps back to near normal.

Longwave trough approaches by Friday afternoon with onshore winds
and approaching upper low sending inland temps back below normal
once again for Saturday and Sunday of the upcoming memorial day
weekend. Latest ECMWF does indicate system may be progressive
with warmer high pressure by memorial day Monday but that scenario
may be dubious with developing tropical system in the gulf of
mexico potentially slowing the large scale west to east flow
across the us.

Aviation As of 4:48 pm pdt Sunday... It'sVFR with a few areas
MVFR ceilings mainly on the coast this afternoon. Low clouds will
generally fill in again tonight and Monday morning. Mid to high
clouds with a 500 mb closed low will slowly move eastward this
evening into Monday.

Vicinity of ksfo... MVFR ceiling tonight into Monday morning, westerly
wind gusting to 30 knots this evening. Gusty westerly wind resumes
Monday afternoon and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ceilings tonight into Monday morning.

Partial clearing possible either by late Monday morning or early
afternoon.

Marine As of 01:17 pm pdt Sunday... A strong north to south
pressure gradient along the california coast will maintain
moderate to strong northwesterly winds over the coastal waters
through Monday. As a result, steep wind waves will produce
hazardous conditions for small crafts. A long period southerly
swell will increase and mix with northwesterly swell by Monday
morning, gradually increasing through much of the week.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 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
public forecast: rww
aviation: canepa
marine: rgass
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi52 min W 13 G 17 56°F 65°F1015.3 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi58 min W 13 G 19 56°F 64°F1013.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi52 min W 22 G 26
PXSC1 25 mi58 min 56°F 50°F
LNDC1 25 mi52 min WSW 14 G 17 56°F 1013.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 25 mi52 min W 13 G 22 56°F 1012.1 hPa
OBXC1 25 mi52 min 56°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi52 min W 18 G 26 56°F 1012.8 hPa
FTPC1 - 9414290 - San Francisco, CA 26 mi58 min WSW 9.9 G 18 55°F 57°F1013.5 hPa
46237 - San Francisco Bar, CA (142) 29 mi70 min 55°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 29 mi80 min WNW 16 G 19 54°F 53°F7 ft1015.1 hPa (-1.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 32 mi83 min S 2.9 61°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 32 mi52 min W 5.1 G 12 62°F 1013.1 hPa
RCMC1 - 9414863 - Richmond, CA 34 mi58 min NW 8.9 G 14 60°F 61°F1012.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi60 min WNW 16 G 23 53°F 51°F1015 hPa51°F
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi52 min SSW 14 G 19 64°F1012 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi52 min W 18 G 21 60°F 1011.7 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 45 mi80 min NW 18 G 21 54°F 53°F7 ft1015.4 hPa (-1.3)
PCOC1 - 9415144 - Port Chicago, CA 45 mi52 min SW 8.9 G 15 64°F 65°F1011.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 48 mi52 min W 11 G 21 64°F 1011.3 hPa

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 Carlos Airport, CA8 mi83 minWSW 9 G 1810.00 miMostly Cloudy57°F46°F67%1014.9 hPa
Half Moon Bay Airport, CA10 mi75 minWNW 12 G 155.00 miOvercast with Haze55°F48°F77%1015.6 hPa
San Francisco, San Francisco International Airport, CA12 mi74 minW 17 G 2210.00 miMostly Cloudy59°F46°F64%1014.2 hPa
Mountain View, Moffett Field, CA15 mi74 minW 810.00 miPartly Cloudy60°F46°F60%1015.2 hPa
Oakland, Metro Oakland International Airport, CA19 mi77 minWSW 17 G 2310.00 miMostly Cloudy58°F48°F72%1014 hPa
Hayward, Hayward Air Terminal, CA19 mi76 minWSW 11 G 1810.00 miA Few Clouds58°F46°F67%1015.6 hPa
San Jose, San Jose International Airport, CA22 mi77 minW 1410.00 miMostly Cloudy62°F46°F56%1014.4 hPa

Wind History from SQL (wind in knots)
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Last 24hrW9W6W5W7W8W5W3W7W6W9
G15
W8NW6W9W6W6W8W7--SW9W12SW13
G18
W11SW9
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1 day agoW14
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W8W8W10W7W8W6W7W9W7W6W5W4W6SW6W9SW9--SW12
G18
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2 days ago--W9W10W7W5W5W4SW6SW4SW4SW7W6W6SW6W7W5SW9W11
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W13--W17
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G24
W17
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Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
Click for Map
Sun -- 12:46 AM PDT     Moonset
Sun -- 04:45 AM PDT     7.72 feet High Tide
Sun -- 05:55 AM PDT     Sunrise
Sun -- 11:15 AM PDT     Moonrise
Sun -- 12:19 PM PDT     -0.97 feet Low Tide
Sun -- 07:10 PM PDT     7.01 feet High Tide
Sun -- 08:15 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.83.54.86.37.47.77.26.14.42.50.8-0.4-0.9-0.80.21.73.45.16.476.85.94.73.6

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Sun -- 12:46 AM PDT     Moonset
Sun -- 02:20 AM PDT     1.09 knots Max Flood
Sun -- 05:18 AM PDT     -0.00 knots Slack
Sun -- 05:55 AM PDT     Sunrise
Sun -- 09:09 AM PDT     -1.83 knots Max Ebb
Sun -- 11:15 AM PDT     Moonrise
Sun -- 12:39 PM PDT     0.01 knots Slack
Sun -- 03:38 PM PDT     1.79 knots Max Flood
Sun -- 07:29 PM PDT     -0.01 knots Slack
Sun -- 08:15 PM PDT     Sunset
Sun -- 10:02 PM PDT     -0.86 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.71.110.70.2-0.4-1-1.6-1.8-1.6-1.1-0.50.31.21.71.81.51.10.4-0.3-0.7-0.9-0.7

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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.