Monday, September25, 2017 L-36.com


Marine Weather and Tides
Colma, 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 6:58AMSunset 7:03PM Sunday September 24, 2017 9:30 PM PDT (04:30 UTC) Moonrise 10:15AMMoonset 9:01PM Illumination 21% Phase: Waxing Crescent; Moon at 4 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- 813 Pm Pdt Sun Sep 24 2017
Tonight..NW winds 10 kt.
Mon..NW winds 5 kt...becoming W 5 to 15 kt in the afternoon.
Mon night..W winds 5 to 15 kt...becoming nw 5 kt after midnight.
Tue..NW winds 5 to 15 kt.
Tue night..NW winds 5 to 15 kt.
Wed..N winds 5 to 10 kt...becoming w.
Thu..Light winds...becoming W 5 to 10 kt.
Fri..W winds 5 to 10 kt.
PZZ500 813 Pm Pdt Sun Sep 24 2017
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 and a thermal trough over the california interior will keep northwesterly winds going over the coastal waters. The strongest winds will be over the northern outer waters with generally lighter winds and seas over the near shore waters.

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 250423
afdmtr
area forecast discussion
national weather service san francisco bay area
923 pm pdt Sun sep 24 2017

Synopsis A gradual warming trend will continue through the first
half of the workweek as high pressure across the eastern pacific
builds over california. While slightly cooling is expected late in
the week, temperatures are forecast to remain above seasonal
averages.

Discussion As of 09:20 pm pdt Sunday... Aside from some high
cloudiness passing through from the north, mostly clear skies
prevail districtwide with the stratus deck having retreated well
offshore. High temperatures this afternoon were generally in the
70s near the water and 80s elsewhere. Downtown san francisco
itself reached 80 deg, 6 deg warmer than on Saturday and 10 deg
above the climatological normal for the date. Mid-evening
temperatures remain on the mild side, with a few locations still
up in the lower 70s.

Present forecasts appear on-track, though have made some upward
adjustments to the MAX temp grids and forecasts for Monday based
on the actual highs today and latest model output.

Prev discussion As of 01:58 pm pdt Sunday... Sunny conditions
persist over the region this afternoon as the air mass aloft warms
in response to weak offshore flow and building high pressure over
the eastern pacific. Meanwhile, at the surface, winds along the
coast remain light and slightly onshore while portions of the
interior are experiencing weak north northeast winds. These
conditions have resulted in a region- wide warming and drying
trend that will continue into the midweek time frame.

Look for temperatures overnight to remain on the cool side of
average for most valley and coastal locations while a more noticeable
warming trend begins in the hills. Temperatures region-wide will
continue on a warming trend Monday and ramp up Tuesday into
Wednesday as surface flow becomes predominantly offshore. By
midweek, 850 mb temperatures are forecast to approach 20 deg c and
will allow for afternoon high temperatures to reach into the
mid upper 80s at the coast with widespread 90s inland. However, even
the warmest inland areas are likely to stay below 100 degrees and a
more uniform temperature spread in the 80s to mid 90s appears most
likely Tuesday through Thursday. With this said, the threat for
heat related illnesses will likely remain in the low to moderate
category given decent overnight cooling.

Slight cooling is then forecast by Friday as weak onshore flow
returns to the coast in response to a mid upper level trough pushing
inland over the pacific northwest. However, the ridge of high
pressure does not completely get replaced and temperatures region-
wide will remain at or slightly above seasonal averages. The medium
to longer range forecast models agree that an upper level ridge will
once again become the dominate weather feature across our region by
late next weekend. This will likely lead to another warming trend by
next Sunday into Monday.

Aviation As of 4:59 pm pdt Sunday... Sct-bkn cirrus cloud coverage
associated with upper level divergence quickly sweeping SE with the
mid-latitude jet stream late this afternoon. High confidenceVFR
forecast for tonight through Monday as dry offshore flow and very
good visibilities prevail.

Vicinity of ksfo...VFR. A few westerly wind gusts to 20-25 knots until
04z this evening. Light surface wind shifting over to n-ne late tonight
into early Monday afternoon. Westerly winds are forecast to resume
from 22z Monday through Monday evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Onshore winds becoming light and shifting
over to e-se direction late tonight and Monday morning. Onshore wind
returns Monday afternoon and evening.

Fire weather As of 9:00 pm pdt Sunday... The warm and dry air
mass over the area will continue to prevail through at least
Wednesday. Relative humidity values in the hills will continue to
drop into the teens during the afternoon hours with overnight
humidity recoveries no higher than 30 to 35 percent. In addition,
periods of moderate and gusty northeast winds are expected at
times, especially Monday night into Tuesday morning and again
Tuesday night. Each of these will also result in further drying of
the air mass. Red flag warnings are in effect for elevations
above 1000 feet in the north bay and east bay through Wednesday
afternoon.

Marine As of 8:13 pm pdt Sunday... High pressure over the
eastern pacific and a thermal trough over the california interior
will keep northwesterly winds going over the coastal waters. The
strongest winds will be over the northern outer waters with
generally lighter winds and seas over the near shore waters.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
public forecast: blier rgass
aviation: canepa
marine: canepa
fire weather: blier
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 mi49 min WSW 1.9 G 2.9 67°F 1012.5 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi43 min WSW 5.1 G 8 62°F 61°F1014.1 hPa
PXSC1 9 mi43 min 67°F 49°F
AAMC1 - 9414750 - Alameda, CA 9 mi43 min NNW 1 G 1.9 68°F 68°F1014 hPa
OBXC1 10 mi43 min 67°F 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi43 min NW 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi43 min WNW 6 G 7 65°F 1013.5 hPa
LNDC1 11 mi43 min N 4.1 G 6 67°F 1013.4 hPa
46237 - San Francisco Bar, CA (142) 14 mi61 min 60°F3 ft
RTYC1 - 9414523 - Redwood City, CA 16 mi43 min NW 5.1 G 6 68°F 68°F1013.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi43 min SSW 5.1 G 8 66°F 1013.9 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi43 min S 1.9 G 2.9
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi41 min NW 7.8 G 12 59°F 59°F4 ft1013.9 hPa (-0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi43 min SW 2.9 G 5.1 72°F 1013.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi43 min WNW 5.1 G 6 71°F 67°F1013.7 hPa44°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi43 min SW 5.1 G 7 69°F 68°F1013.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi41 min NW 9.7 G 14 62°F 62°F5 ft1014 hPa (+0.5)
PRYC1 - 9415020 - Point Reyes, CA 37 mi43 min NW 12 G 15 64°F 58°F1013.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi43 min NNW 2.9 G 2.9 70°F 1013 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi106 min NW 1.9 67°F 1012 hPa42°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 mi35 minWNW 1210.00 miFair65°F46°F51%1013.6 hPa
Oakland, Metro Oakland International Airport, CA11 mi38 minWNW 510.00 miPartly Cloudy65°F57°F76%1013.6 hPa
Half Moon Bay Airport, CA12 mi36 minWNW 310.00 miFair59°F0°F%1013.5 hPa
San Carlos Airport, CA14 mi41 minW 610.00 miClear72°F32°F23%1013.9 hPa
Hayward, Hayward Air Terminal, CA16 mi37 minNW 310.00 miFair66°F48°F54%1014.3 hPa
Palo Alto Airport, CA21 mi44 minWNW 610.00 miClear64°F41°F43%1013.5 hPa

Wind History from SFO (wind in knots)
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Last 24hrW8W6CalmW6W6SW3S4W3SW3CalmCalmS3NE3NE3N5NE5E4W16W16W20
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1 day agoW7W6W6W4W4W3W4W4W4S3CalmCalmCalmN9NE74W13W14W17W23W19W19W14NW10
2 days agoW19
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Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Mon -- 04:47 AM PDT     5.62 feet High Tide
Mon -- 07:00 AM PDT     Sunrise
Mon -- 10:15 AM PDT     2.55 feet Low Tide
Mon -- 12:10 PM PDT     Moonrise
Mon -- 04:09 PM PDT     6.49 feet High Tide
Mon -- 07:01 PM PDT     Sunset
Mon -- 10:40 PM PDT     Moonset
Mon -- 11:06 PM PDT     0.90 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.72.83.94.85.55.65.34.53.62.92.62.73.34.25.26.16.56.35.64.53.221.20.9

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
Mon -- 01:42 AM PDT     0.85 knots Max Flood
Mon -- 05:08 AM PDT     -0.00 knots Slack
Mon -- 07:00 AM PDT     Sunrise
Mon -- 07:44 AM PDT     -0.70 knots Max Ebb
Mon -- 10:43 AM PDT     0.00 knots Slack
Mon -- 12:10 PM PDT     Moonrise
Mon -- 01:38 PM PDT     0.62 knots Max Flood
Mon -- 04:37 PM PDT     -0.00 knots Slack
Mon -- 07:01 PM PDT     Sunset
Mon -- 08:01 PM PDT     -1.06 knots Max Ebb
Mon -- 10:39 PM PDT     Moonset
Mon -- 11:32 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.80.80.70.50.1-0.4-0.6-0.7-0.5-0.20.10.40.60.60.50.2-0.1-0.6-0.9-1.1-0.9-0.6-0.2

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 (0,6,7,8)
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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.