Saturday, September23, 2017 L-36.com


Marine Weather and Tides
Cupertino, 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 6:56AMSunset 7:03PM Saturday September 23, 2017 1:04 PM PDT (20:04 UTC) Moonrise 9:17AMMoonset 8:24PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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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PZZ560 Pigeon Point To Point Pinos To 10 Nm- 844 Am Pdt Sat Sep 23 2017
.small craft advisory in effect from 2 pm pdt this afternoon through this evening...
Today..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 11 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 5 ft at 11 seconds.
Sun..N winds 10 kt...becoming nw 10 to 20 kt in the afternoon. Wind waves 3 to 5 ft. NW swell 4 to 5 ft at 11 seconds.
Sun night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 5 ft at 14 seconds.
Mon..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 14 seconds.
Tue..NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
Wed..NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
PZZ500 844 Am Pdt Sat Sep 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure offshore will bring light to breezy north to northwest winds today and through the coming days. The northwest swell train that first arrived several days ago will continue to weaken.

7 Day Forecast for Marine Location Near Cupertino, CA
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location: 37.31, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 231949
afdmtr
area forecast discussion
national weather service san francisco bay area
1249 pm pdt Sat sep 23 2017

Synopsis Building high pressure over the eastern pacific will
result in a gradual warming trend through much of the upcoming
workweek.

Discussion As of 12:48 pm pdt Saturday... A cool, dry air mass
remains in place over the region this afternoon with temperatures
generally only warming into the 60s and 70s. While a few spots may
top out in the lower 80s inland, temperatures remain below
seasonal averages for most locations. For tonight, temperatures
will cool back into the 40s for most inland valley locations with
light winds and a mainly clear sky. With that said, cannot rule
out a few low clouds developing off of the central coast that may
briefly push inland over the monterey peninsula early Sunday
morning.

Daytime temperatures nudge up to near seasonal averages on Sunday as
the long-wave trough shifts eastward and a ridge of high pressure
begins to develop over the eastern pacific. With the building ridge
off of the coast, temperatures will continue on a gradual warming
trend into early next week with very little to no coastal stratus to
speak of. By Tuesday afternoon, widespread 80s will be likely region-
wide with some of the warmest inland valley locations and higher
elevations reaching into the 90s.

The ridge axis is then forecast to shift inland across northern
california by midweek with well above average temperatures likely to
develop. In addition, weak offshore flow will be possible by midweek
which will help drive warmer conditions all the way to the coast.

Currently, Wednesday and Thursday appear to be the warmest days of
the week with mid upper 80s possible at the coast and widespread 90s
inland. With 850 mb temperatures only forecast to warm to around 18-
19 deg c during this heat event, the heat risk will likely remain
low to potentially moderate. The dry air mass and mainly clear sky
conditions will also allow for modest cooling during the overnight
hours, further reducing any heat risks. Nonetheless, will closely
monitor model trends and adjust the forecast accordingly in the
coming days. Slight cooling is then expected by Friday of next week
as the ridge aloft weakens ahead of a mid upper level trough to the
north. However, above average temperatures and dry weather
conditions are favored through the extended.

Aviation As of 10:50 am pdt Saturday... WidespreadVFR through
the duration at all TAF sites. Breezy onshore winds by the
afternoon, especially along the coast. Models all showing a few
low marine clouds attempting to sneak into the monterey region
around sunrise tomorrow, however, confidence is low.

Vicinity of ksfo...VFR. West winds 14-16 kt after 22z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Some low clouds possible around
sunrise.

Fire weather As of 3:30 am pdt Saturday... A warming and drying
trend will start this afternoon and continue at least into at
least Tuesday morning. In addition to the warm temperatures there
will be lowering humidity values and periods of gusty northeast
winds across the north bay hills, especially across the napa
county hills and the hills of northern sonoma county. Fine fuels
will continue to dry given the lack of marine air and humidity.

Climatology also favors a greatly chance for critical fire
weather conditions for the weekend and next week.

Marine As of 10:50 am pdt Saturday... High pressure offshore
will bring light to breezy north to northwest winds today and
through the coming days. The northwest swell train that first
arrived several days ago will continue to weaken.

Mtr watches warnings advisories
Tday Sca... Mry bay from 2 pm
sca... Pigeon pt to pt pinos 0-10 nm from 2 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 2 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rgass
aviation: drp
marine: drp
fire weather: bell rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 16 mi47 min WNW 6 G 8 69°F 68°F1012.9 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi47 min NW 4.1 G 7 73°F 66°F1013.6 hPa
LNDC1 36 mi47 min NW 6 G 9.9 71°F 1013.1 hPa
OBXC1 37 mi47 min 67°F 49°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi47 min WNW 8 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi47 min WNW 8 G 8.9 66°F 1013.2 hPa
ELXC1 - Elkhorn Slough Reserve, CA 38 mi80 min WNW 6 68°F 1013 hPa53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi47 min NW 5.1 G 8 71°F 1012.2 hPa
PXSC1 38 mi47 min 71°F 41°F
46092 - MBM1 39 mi60 min WSW 5.8 59°F 61°F1013.4 hPa (+0.4)
FTPC1 - 9414290 - San Francisco, CA 40 mi53 min WSW 12 G 15 65°F 63°F1013.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 40 mi75 min NNW 3.9 G 5.8 60°F 62°F7 ft1013.4 hPa (+0.5)
46114 - West Monterey Bay, CA 43 mi35 min 63°F7 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi75 min NW 9.7 G 12 61°F 61°F6 ft1013.6 hPa (+0.7)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi47 min NW 6 G 12 76°F 1013.4 hPa
46237 - San Francisco Bar, CA (142) 45 mi65 min 61°F4 ft
RCMC1 - 9414863 - Richmond, CA 46 mi53 min NW 5.1 G 8 71°F 64°F1013 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi44 min 63°F4 ft

Wind History for Redwood City, CA
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N7
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA8 mi69 minN 710.00 miFair73°F37°F28%1013.8 hPa
San Jose, San Jose International Airport, CA8 mi72 minVar 510.00 miFair74°F37°F26%1013.2 hPa
Palo Alto Airport, CA12 mi78 minW 610.00 miClear72°F48°F44%1013.5 hPa
San Jose / Reid / Hillv, CA13 mi78 minWNW 810.00 miClear73°F41°F31%1013.9 hPa
San Carlos Airport, CA18 mi4.3 hrsN 010.00 miClear64°F50°F60%1013.5 hPa
Hayward, Hayward Air Terminal, CA24 mi71 minSW 510.00 miFair70°F39°F32%1014.2 hPa

Wind History from NUQ (wind in knots)
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Last 24hrN10N12N14NW10N11N5NW8NW6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm3NW5N7N7
1 day agoNW7
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W6W5W4SW3CalmCalmCalmCalmCalmCalmSE3SE4S5SE4SE63E5N8N7
2 days agoN5N3W10
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NW6NW8NW5NW6W7W6W6W7W9W5W8W6W6W8W74NW10
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Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California
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Upper Guadalupe Slough
Click for Map
Sat -- 03:34 AM PDT     8.45 feet High Tide
Sat -- 06:56 AM PDT     Sunrise
Sat -- 10:05 AM PDT     1.83 feet Low Tide
Sat -- 10:16 AM PDT     Moonrise
Sat -- 03:32 PM PDT     9.32 feet High Tide
Sat -- 07:02 PM PDT     Sunset
Sat -- 09:24 PM PDT     Moonset
Sat -- 10:43 PM PDT     0.81 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.15.27.18.38.47.76.44.93.32.31.82.33.95.97.89.19.28.57.15.33.41.910.9

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Sat -- 12:38 AM PDT     1.37 knots Max Flood
Sat -- 03:51 AM PDT     -0.00 knots Slack
Sat -- 06:57 AM PDT     Sunrise
Sat -- 07:51 AM PDT     -0.99 knots Max Ebb
Sat -- 10:14 AM PDT     0.00 knots Slack
Sat -- 10:16 AM PDT     Moonrise
Sat -- 12:44 PM PDT     1.17 knots Max Flood
Sat -- 03:45 PM PDT     -0.00 knots Slack
Sat -- 07:03 PM PDT     Sunset
Sat -- 08:08 PM PDT     -1.20 knots Max Ebb
Sat -- 09:24 PM PDT     Moonset
Sat -- 10:46 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.41.10.6-0.1-0.4-0.7-0.9-1-0.7-0.20.511.20.90.5-0.1-0.5-0.8-1.1-1.2-1-0.50.2

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 (16,3,4,5)
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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.