Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Colma, 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 5:51AMSunset 8:21PM Wednesday May 23, 2018 3:12 PM PDT (22:12 UTC) Moonrise 1:35PMMoonset 1:51AM Illumination 66% 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 245 Pm Pdt Wed May 23 2018
Tonight..W winds 10 to 20 kt.
Thu..SW winds 10 to 20 kt.
Thu night..SW winds 10 to 20 kt.
Fri..SW winds 5 to 15 kt. Slight chance of showers in the morning, then chance of showers in the afternoon.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 10 to 20 kt...decreasing to 10 kt.
Sun..SW winds 10 kt.
Memorial day..E winds 5 kt...becoming sw.
PZZ500 245 Pm 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... Northwest winds will remain light across the waters today and tonight. Winds will turn southerly tomorrow morning as an upper low and weak surface cold front approach from the west. This will bring showers to the area tomorrow and Friday. Winds will turn back out of the northwest once the upper low moves through late Friday. Winds across the waters will also increase and remain gusty through the holiday weekend. Long period southerly swell will persist through the end of the week. Periods and swell heights will gradually lower over the next few days before a second long period, although weaker, southerly swell moves in towards the end of the weekend.

7 Day Forecast for Marine Location Near Colma, CA
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location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 232048
afdmtr
area forecast discussion
national weather service san francisco bay area
148 pm pdt Wed may 23 2018

Synopsis Seasonably cool weather conditions along with overnight
and morning low clouds will continue to impact the region through
late week. An upper level system will then approach the coast late
Thursday and bring a chance of rain showers to much of the region
into Friday. Showers may linger into Saturday morning before a
warming and drying trend returns late in the holiday weekend.

Discussion As of 01:46 pm pdt Wednesday... Low clouds continue
to impact the northern two-thirds of the region this afternoon
with persistent onshore flow. This has resulted cooler conditions
compared to yesterday over portions of the north bay while areas
further south are a few degrees warmer. In addition, seeing breaks
in the cloud cover over the pacific this afternoon.

With all this, expecting little change overall in the pattern
heading into tonight and Thursday morning ahead of an approaching
mid upper level low pressure system. Look for coastal drizzle to be
a bit less widespread overnight into early Thursday morning with
continued cool weather conditions. Low clouds will likely fill back
in over the ocean and spread inland during the overnight hours as
well.

Rain showers are forecast to develop late Thursday night and spread
inland Friday as the mid upper level system pushes inland. There is
also a non-zero chance of high-based thunderstorms across portions
of the region late Thursday night into Friday morning as moisture
and instability increases in the 500-700 mb layer. However, have
left out mention of thunderstorms in the forecast as confidence is
low at this time and will needed to be monitored in the next 24
hours. Showers will remain possible into Friday night before
diminishing Saturday morning as the upper level system shifts inland.

Overall, rainfall amounts will range from a few hundredths to one-
tenth of an inch in most locations. Locally higher amounts will be
possible in any heavier showers that develop while the showery
nature of this system may leave some areas with no measurable
rainfall at all.

A warming and drying trend is then forecast into Sunday with
temperatures back to around seasonal averages by the memorial day
holiday. This will be the result of a building ridge of high
pressure along the eastern pacific. Another mid upper level trough
is then forecast by the middle part of next week that would cool
temperatures once again and potentially enhance overnight morning
coastal stratus.

Aviation As of 10:41 am pdt Wednesday for 18z tafs... Most of
the region has been inundated with stratus all morning. Satellite
imagery is showing the stratus beginning to dissipate over inland
areas. The sf and monterey peninsulas may remain ifr MVFR through
the period with occasional clearing this afternoon. The rest of
the TAF sites are expected to seeVFR conditions this afternoon
through the early evening before low clouds return and settle in
once again for the night.

Onshore winds will continue today becoming breezy in the afternoon
at around 15 kt. Winds however, are not expected to be as gusty
as the past few days since the sfo-sac gradient has lessoned.

Overall forecast confidence: low-moderate
vicinity of ksfo... Ifr to MVFR conditions remain in place with
cigs currently between 1500 and 2500 ft. Some brief clearing may
be possible this afternoon, otherwise expect low CIGS to prevail.

Any afternoon clearing will fill back in tonight. Onshore winds
today increasing to around 15 kt in the afternoon with occasional
higher gusts possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR CIGS currently at mry and sns at
around 2000 ft. Satellite imagery is showing stratus beginning to
clear in the salinas valley.VFR conditions at sns are expected
this afternoon while mry may remain under MVFR CIGS through the
period with only sporadic clearing. Regardless, any clear skies
will be filled back in this evening. Westerly winds becoming
around 15 kt in the afternoon.

Marine As of 09:01 am pdt Wednesday... Light northwesterly
winds will continue across the coastal waters today and tonight
with the exception of locally gusty winds through the golden gate
gap, around angel island, and in the west delta from late this
morning through the afternoon. Winds across the waters will turn
southerly by tomorrow morning as an upper low and weak surface
cold front approach from the west. This will bring chances of
showers tomorrow and Friday. Long period southerly swell will
persist along with a shorter period northwest swell through the
week, diminishing by Friday.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 3 pm
public forecast: rgass
aviation: as
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi43 min W 5.1 G 13 57°F 1014.2 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi43 min W 8.9 G 13 55°F 58°F1015.6 hPa
PXSC1 9 mi43 min 57°F 53°F
AAMC1 - 9414750 - Alameda, CA 9 mi43 min W 9.9 G 13 58°F 62°F1015.3 hPa
OBXC1 10 mi43 min 56°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi43 min WNW 13 G 15 55°F 1015.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi43 min W 9.9 G 13
LNDC1 11 mi43 min W 8 G 12 58°F 1015 hPa
46237 - San Francisco Bar, CA (142) 14 mi43 min 55°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi38 min SE 1 57°F 1015 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi43 min WNW 15 G 18 59°F 64°F1015.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi43 min SW 9.9 G 12 57°F 1015.2 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi43 min SW 7 G 9.9 58°F 62°F1014.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi33 min W 7.8 G 9.7 53°F 52°F1016 hPa53°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi43 min WSW 11 G 15 59°F 1014 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi43 min WSW 14 G 18 60°F 64°F1014.1 hPa55°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi83 min W 5.8 G 7.8 54°F 55°F5 ft1015.4 hPa (+0.3)
PCOC1 - 9415144 - Port Chicago, CA 33 mi43 min SW 12 G 19 63°F 64°F1013.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 37 mi43 min W 6 G 8.9 51°F1014.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi43 min W 9.9 G 19 63°F 1013.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi88 min W 13 63°F 1014 hPa53°F

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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W14
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi17 minWSW 1410.00 miMostly Cloudy63°F48°F60%1014.9 hPa
Oakland, Metro Oakland International Airport, CA11 mi20 minW 1410.00 miOvercast61°F50°F67%1015 hPa
Half Moon Bay Airport, CA12 mi18 minWSW 710.00 miMostly Cloudy57°F53°F88%1015.9 hPa
San Carlos Airport, CA14 mi78 minWNW 1310.00 miOvercast61°F50°F68%1014.9 hPa
Hayward, Hayward Air Terminal, CA16 mi19 minWNW 1410.00 miOvercast62°F50°F65%1015.9 hPa
Palo Alto Airport, CA21 mi4.4 hrsWSW 910.00 miOvercast63°F50°F64%1014.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW15W14W12W11W11W8SW6SW7SW6SW6SW5SW4W6W5SW4SW4SW5W5W8W11W12W11W11W14
1 day agoW22
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2 days agoW17
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W17W15W10SW7S4W4SW3S3CalmN3NE444W16
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W21

Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
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Wed -- 02:28 AM PDT     1.83 feet Low Tide
Wed -- 02:50 AM PDT     Moonset
Wed -- 05:54 AM PDT     Sunrise
Wed -- 07:50 AM PDT     5.70 feet High Tide
Wed -- 02:20 PM PDT     0.18 feet Low Tide
Wed -- 02:34 PM PDT     Moonrise
Wed -- 08:19 PM PDT     Sunset
Wed -- 09:13 PM PDT     6.81 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.42.41.91.92.53.54.65.45.75.34.43.11.80.70.20.312.23.65.16.26.86.65.7

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
Wed -- 02:43 AM PDT     0.00 knots Slack
Wed -- 02:50 AM PDT     Moonset
Wed -- 05:37 AM PDT     0.67 knots Max Flood
Wed -- 05:53 AM PDT     Sunrise
Wed -- 08:21 AM PDT     -0.00 knots Slack
Wed -- 11:34 AM PDT     -0.99 knots Max Ebb
Wed -- 02:34 PM PDT     Moonrise
Wed -- 02:51 PM PDT     0.01 knots Slack
Wed -- 06:15 PM PDT     1.03 knots Max Flood
Wed -- 08:19 PM PDT     Sunset
Wed -- 09:21 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.7-0.30.10.50.60.70.50.2-0.3-0.7-1-1-0.8-0.50.10.50.9110.70.2-0.3-0.7

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (18,4,5,8)
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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.