Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Colma, CA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:23AMSunset 7:52PM Saturday April 21, 2018 11:58 PM PDT (06:58 UTC) Moonrise 10:15AMMoonset 12:03AM Illumination 44% Phase: First Quarter Moon; Moon at 7 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 902 Pm Pdt Sat Apr 21 2018
Tonight..W winds 5 to 15 kt.
Sun..NW winds 5 to 15 kt.
Sun night..NW winds 5 to 15 kt.
Mon..NW winds 5 kt.
Mon night..W winds 5 kt.
Tue..SW winds 5 kt.
Wed..SW winds 10 kt.
Thu..W winds 10 kt.
PZZ500 902 Pm Pdt Sat Apr 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will maintain brisk northwest winds across the coastal waters through the weekend. Steep wind waves and fresh swell will result in choppy seas over the weekend and possibly into early next week.

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 220506
afdmtr
area forecast discussion
national weather service san francisco bay area
1006 pm pdt Sat apr 21 2018

Synopsis A warming trend and dry weather are forecast to
continue through the weekend. Cooler temperatures are expected
by the middle of next week as a low pressure system develops over
the eastern pacific.

Discussion As of 8:45 pm pdt Saturday... Apart from morning low
clouds in the salinas valley and near monterey bay, our region
experienced a mostly sunny day, along with warm inland
temperatures. Afternoon highs were in the 60s near the ocean, 70s
around san francisco bay and in the coastal valleys, and 80s in
the inland valleys. Today's highs were about 5 degrees warmer than
yesterday and as much as ten degrees warmer than normal.

Skies remain mostly clear across our region this evening,
including coastal areas. Satellite shows no coastal stratus at the
present time and there likely won't be any through the evening
given the robust 7.2 mb gradient from acv to sfo providing ample
northwest coastal breezes and mixing. However, the northerly
gradient is expected to ease overnight, which will probably allow
for areas of low clouds to form along the coast and locally into
the salinas valley by sunrise Sunday. Low clouds are expected to
clear relatively early on Sunday and we can expect a day much like
today with mostly sunny conditions and warmer than normal
temperatures. However, a weak shortwave trough moving inland to
our north may result in slightly cooler temperatures tomorrow
compared to today. Temperatures are then expected to warm a few
degrees on Monday as the upper ridge strengthens over california.

A cooling trend is forecast to begin on Tuesday as the upper
ridge shifts eastward and an upper low develops well offshore
beyond 130w. This upper low is forecast to very slowly approach
the coast through the end of next week, resulting in continued
cooling. By midweek look for temperatures to return to near normal
or cool a bit below normal. The models agree that precipitation
associated with the upper low will remain offshore through the end
of the work week.

Forecast uncertainty increases by next weekend due to model
differences. The ECMWF tracks the upper low inland well to our
north and keeps our area dry through the weekend. The GFS tracks
the low farther to the south and also stalls the low over
california through the weekend, resulting in shower chances for
much of our area next weekend.

Aviation As of 10:06 pm pdt Saturday...VFR prevails under upper
level ridging and a compressed marine temperature inversion down
to 700-1200 feet this evening. It's a high confidenceVFR forecast
through the evening, then somewhat lowering confidence regarding
possible patchy coastal stratus and or fog late evening into Sunday
morning. Any coastal stratus and fog coverage Sunday morning should
scatter out quickly in the morning. Forecast is thus mainly persistence
tonight and Sunday, pressure gradients will remain near 7 mb acv-sfo,
weak offshore wmc-sfo, and weak onshore to near neutral sfo-sac.

The offshore pressure gradient wmc-sfo steepens to 10 mb or slightly
stronger late Sunday night into Monday morning per recent NAM output;
recent NAM output showed an onshore bias sfo-wmc. A trend toward
stronger offshore, downsloping, warming, drying wind should help
keepVFR going later Sunday into Monday for the terminals.

Vicinity of ksfo...VFR. Westerly wind becoming light by late evening,
shifting to a light NE wind Sunday morning. Gusty westerly winds resume
Sunday afternoon and early evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Near high confidenceVFR holds this evening,
somewhat lowering confidence on possible coastal stratus and or fog
developing 08z-12z Sunday morning. Any patchy ifr ceilings and or
visibilities Sunday morning due to stratus and or fog should quickly
lift in the morning.VFR is forecast for most of the day Sunday. Onshore
winds near 10 knots becoming light near 5 knots by mid evening, onshore
winds resume to 10-15 knots by early Sunday afternoon.

Marine As of 9:02 pm pdt Saturday... High pressure over the
eastern pacific will maintain brisk northwest winds across the
coastal waters through the weekend. Steep wind waves and fresh
swell will result in choppy seas over the weekend and possibly
into early next week.

Mtr watches warnings advisories
Tngt Sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: dykema
aviation: canepa
marine: rowe cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi40 min Calm G 4.1 56°F 1016.4 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi46 min W 4.1 G 8 52°F 55°F1017.7 hPa
PXSC1 9 mi40 min 56°F 50°F
AAMC1 - 9414750 - Alameda, CA 9 mi46 min W 7 G 8.9 55°F 63°F1017.5 hPa
OBXC1 10 mi40 min 56°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi40 min SW 6 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi40 min NW 2.9 G 4.1 57°F 1017.3 hPa
LNDC1 11 mi40 min WSW 4.1 G 5.1 56°F 1017.3 hPa
46237 - San Francisco Bar, CA (142) 14 mi58 min 53°F7 ft
RTYC1 - 9414523 - Redwood City, CA 16 mi40 min N 1.9 G 4.1 58°F 64°F1017.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi46 min SSW 11 G 14 55°F 1017.4 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi46 min SSE 5.1 G 8 56°F 56°F1016.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi68 min NW 18 G 19 52°F 52°F10 ft1017.5 hPa (+0.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi46 min W 8.9 G 12 58°F 1016.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi40 min WNW 11 G 14 60°F 60°F1016.5 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi40 min W 9.9 G 12 62°F 61°F1016.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi68 min NNW 12 G 16 53°F 53°F11 ft1018.1 hPa (+0.7)
PRYC1 - 9415020 - Point Reyes, CA 37 mi40 min WNW 21 G 26 53°F1016.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi46 min NW 7 G 9.9 65°F 1015.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi73 min WNW 4.1 58°F 1016 hPa51°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi62 minWNW 1210.00 miFair55°F46°F74%1017.2 hPa
Oakland, Metro Oakland International Airport, CA11 mi65 minWNW 810.00 miFair55°F50°F83%1017.6 hPa
Half Moon Bay Airport, CA12 mi63 minN 05.00 miFog/Mist46°F44°F93%1018.6 hPa
San Carlos Airport, CA14 mi63 minNW 410.00 miFair59°F48°F68%1017.3 hPa
Hayward, Hayward Air Terminal, CA16 mi64 minN 410.00 miFair57°F46°F69%1018.3 hPa
Palo Alto Airport, CA21 mi3.2 hrsN 010.00 miClear0°F0°F%1017.3 hPa

Wind History from SFO (wind in knots)
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Last 24hrW9CalmW7W6W10W5W5CalmCalmE6E4NE5NE3NE4NE4NW13W18W20W23W18W22W13W16W12
1 day agoNW3CalmW3W6W3CalmCalmW4CalmCalmNE4NE4NE4W16W16W21W23W23W24
G28
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2 days agoNW8NW7W9W8W6W8W5W6W6W9W13W16W19W21
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W19W18W9W9W7

Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Sun -- 01:58 AM PDT     Moonset
Sun -- 05:30 AM PDT     6.55 feet High Tide
Sun -- 06:24 AM PDT     Sunrise
Sun -- 12:18 PM PDT     Moonrise
Sun -- 12:44 PM PDT     -0.43 feet Low Tide
Sun -- 02:46 PM PDT     First Quarter
Sun -- 07:51 PM PDT     Sunset
Sun -- 08:04 PM PDT     5.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.83.13.94.95.86.56.55.94.83.31.70.5-0.3-0.40.112.23.44.65.55.95.64.83.9

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
Sun -- 12:19 AM PDT     0.00 knots Slack
Sun -- 01:58 AM PDT     Moonset
Sun -- 03:09 AM PDT     0.54 knots Max Flood
Sun -- 05:55 AM PDT     -0.00 knots Slack
Sun -- 06:24 AM PDT     Sunrise
Sun -- 09:38 AM PDT     -1.21 knots Max Ebb
Sun -- 12:18 PM PDT     Moonrise
Sun -- 01:14 PM PDT     0.01 knots Slack
Sun -- 02:46 PM PDT     First Quarter
Sun -- 04:36 PM PDT     0.96 knots Max Flood
Sun -- 07:51 PM PDT     Sunset
Sun -- 08:08 PM PDT     -0.01 knots Slack
Sun -- 10:36 PM PDT     -0.58 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.10.20.40.50.50.3-0-0.4-0.9-1.2-1.2-0.9-0.6-0.10.30.70.90.90.80.50.1-0.3-0.5-0.6

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 (2,6,7,8)
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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.