Wednesday, March22, 2017 L-36.com


Marine Weather and Tides
Cupertino, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:05AMSunset 7:24PM Wednesday March 22, 2017 5:30 PM PDT (00:30 UTC) Moonrise 2:39AMMoonset 1:03PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 150 Pm Pdt Wed Mar 22 2017
.small craft advisory in effect from 9 pm pdt this evening through late tonight...
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 9 ft at 13 seconds.
Thu..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 13 seconds.
Thu night..SW winds 10 kt...becoming southeast 10 to 20 kt after midnight. Wind waves 3 to 5 ft. W swell 4 to 6 ft at 13 seconds. Slight chance of rain after midnight.
Fri..SE winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 5 to 7 ft at 15 seconds. Rain.
Fri night..S winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 7 ft at 14 seconds. Rain in the evening, then chance of showers after midnight.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 5 to 7 ft...increasing to 7 to 8 ft.
Sun..SW winds 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft. Chance of showers, then showers likely.
Mon..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 6 to 8 ft. Slight chance of showers.
PZZ500 150 Pm Pdt Wed Mar 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Increasing northwest winds through Thursday morning. Winds will weaken then turn southerly ahead of the next system through the day Thursday. Strong south to southwest winds will then prevail as a storm system moves across the coastal waters. High winds and seas can be expected Friday as the front moves through.

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 222137
afdmtr
area forecast discussion
national weather service san francisco bay area
237 pm pdt Wed mar 22 2017

Synopsis Scattered showers along with a few thunderstorms can
be expected into the early evening hours. The next storm system
is projected to impact the region late week. Widespread rainfall
and stronger winds return to the northern portion of the region
late Thursday and will spread southward during the day Friday. Dry
conditions return for most of Saturday with another weak system
forecast to push through starting Saturday night. Dry weather and
warmer temperatures are then likely next week.

Discussion As of 3:00 pm pdt Wednesday... Kmux radar shows
scattered showers continuing across our region -- especially for
the southern third of the cwa. Returns indicate a few moderate
cells so would expect a few are dropping small hail. Showers will
greatly diminish once the Sun GOES down, and additional
accumulations will mostly be under a tenth.

Dry weather will return for tonight through the majority of
Thursday before another system from the north moves through and
brings widespread rainfall back into the picture. Models have been
advertising this system for nearly a week and the latest guidance
has only slightly wavered from previous runs. Now looks like rain
will move into the north bay Thursday night, down to sf bay Friday
morning and to monterey bay starting around noon. However, the
main story will be the moderate to heavy band of rain associated
with a surface front that will go through later than the initial
round of rain. That band could produce high rain rates for a brief
period possibly leading to some urban and small stream issues. At
the same time southerly winds will be on the increase as the front
approaches. Gusts in many urban locations of 25 to 35 mph can be
expected. Values to 50 mph are possible above 1,500 feet. Guidance
has slightly trended downward so at this time do not expect to
issue wind advisories.

Rainfall amounts have only slightly changed from previous forecast
packages. Still looks that the best ivt numbers (and longest
duration) will focus on the north bay with widespread 1.5-3"
expected (locally 4+" for the north bay mountains). Similar values
can be expected for the sc mountains plus the santa lucias.

Around sf bay generally 2/3" to 1.5" is forecast with mostly less
than 2/3" from the santa clara valley southward.

Behind the front scattered showers are possible into early
Saturday. This will be followed quickly by another system that
will again move north-to-south late Saturday night through
Sunday. This feature will be the weakest of the week and rainfall
totals should be generally under 1/2" for most urban locations.

A ridge of high pressure will build behind that system and bring
warmer and drier conditions back to our region for most of next
week and possibly through the following week.

Aviation As of 10:50 am pdt Wednesday... Expect to see a trend
towards gradually improving ceilings, visibilities, and fewer rain
showers today. The bulk of the rain activity has now shifted
eastward into the central valley, however, isolated to scattered
rain showers could continue into the afternoon (primarily for
east bay and monterey bay regions). Winds will become breezy this
afternoon, especially around the san francisco bay. Model data
indicating potential for 2000-3000 ft CIGS overnight.

Vicinity of ksfo...VFR. Onshore winds 10-20kt. Occasional gust to
25-30kt possible this afternoon.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... PatchworkVFR/MVFR due to lowered
ceilings. Some rain showers will move across the monterey bay
terminals through late morning into the early afternoon.

Marine As of 02:24 pm pdt Wednesday... Increasing northwest
winds through Thursday morning. Winds will weaken then turn
southerly ahead of the next system through the day Thursday.

Strong south to southwest winds will then prevail as a storm
system moves across the coastal waters. High winds and seas can
be expected Friday as the front moves through.

Mtr watches/warnings/advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm from 9 pm until 3 am
sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: bell
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 16 mi42 min W 14 G 17 56°F 60°F1018.1 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi42 min W 11 G 16 56°F 62°F1018.7 hPa
LNDC1 36 mi78 min W 12 G 18 57°F 1018.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi42 min W 20 G 23
OBXC1 37 mi42 min 55°F 45°F
PXSC1 38 mi42 min 56°F 43°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi42 min W 19 G 23 55°F 1018.1 hPa
46092 - MBM1 39 mi81 min W 19 55°F 56°F1017.7 hPa (-0.3)
FTPC1 - 9414290 - San Francisco, CA 40 mi42 min W 8.9 G 15
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi40 min 18 G 23 55°F 56°F7 ft1018.9 hPa (+0.0)
46114 - West Monterey Bay, CA 43 mi30 min 56°F8 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi40 min WNW 14 G 18 54°F 56°F9 ft1018.8 hPa (-0.3)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi42 min WNW 14 G 18 59°F 1018 hPa
46237 - San Francisco Bar, CA (142) 45 mi60 min 57°F9 ft
RCMC1 - 9414863 - Richmond, CA 46 mi42 min WNW 8.9 G 13
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi39 min 57°F4 ft

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Last
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S8
G14
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G10
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G8
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G11
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SE1
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NE4
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W5
W8
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G11
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G14
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G16
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1 day
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SE9
G13
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G15
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G12
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G16
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W12
G15
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N8
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N4
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G16
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G16
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G13

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA8 mi34 minWNW 7 G 1810.00 miPartly Cloudy59°F39°F49%1018.6 hPa
San Jose, San Jose International Airport, CA8 mi37 minNW 1110.00 miMostly Cloudy57°F41°F55%1017.9 hPa
Palo Alto Airport, CA12 mi43 minWNW 1210.00 miPartly Cloudy59°F44°F59%1018.3 hPa
San Jose / Reid / Hillv, CA13 mi43 minNNW 1310.00 miMostly Cloudy61°F42°F52%1018.6 hPa
San Carlos Airport, CA18 mi43 minW 1310.00 miPartly Cloudy57°F39°F51%1018.6 hPa
Hayward, Hayward Air Terminal, CA24 mi36 minW 1610.00 miFair59°F39°F49%1019.3 hPa

Wind History from NUQ (wind in knots)
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Last 24hrS8S9
G15
S6S4SE3SE4S4SE7W63E7SE4S5S3SW3W66N8NW8N10NW9NW10W10
G17
W7
G18
1 day agoS6S7S5S5SE7SE7S8SE9
G20
SE8
G16
S8S7SE8S8SE9SE12SE9NW7W9W12W9
G18
SW6SW7
G15
SW12SW9
G15
2 days agoN6NW7N6CalmCalmCalmN4CalmCalmCalmCalmSE4SE9SE8SE7SE11SE10
G19
SE10SE11SE9SE13
G18
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G19
S11
G17
S8

Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California
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Upper Guadalupe Slough
Click for Map
Wed -- 03:38 AM PDT     Moonrise
Wed -- 04:11 AM PDT     3.28 feet Low Tide
Wed -- 07:08 AM PDT     Sunrise
Wed -- 08:49 AM PDT     8.21 feet High Tide
Wed -- 02:03 PM PDT     Moonset
Wed -- 04:43 PM PDT     0.56 feet Low Tide
Wed -- 07:22 PM PDT     Sunset
Wed -- 11:05 PM PDT     7.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.25.44.43.63.33.64.86.47.88.27.86.95.642.51.40.70.61.22.54.15.66.87.3

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
Wed -- 01:37 AM PDT     -0.48 knots Max Ebb
Wed -- 03:38 AM PDT     Moonrise
Wed -- 04:09 AM PDT     0.00 knots Slack
Wed -- 06:30 AM PDT     0.69 knots Max Flood
Wed -- 07:08 AM PDT     Sunrise
Wed -- 09:18 AM PDT     -0.00 knots Slack
Wed -- 01:51 PM PDT     -1.01 knots Max Ebb
Wed -- 02:03 PM PDT     Moonset
Wed -- 04:50 PM PDT     0.01 knots Slack
Wed -- 07:22 PM PDT     Sunset
Wed -- 07:42 PM PDT     1.12 knots Max Flood
Wed -- 10:48 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.5-0.5-0.3-0.10.40.70.70.50.2-0.2-0.5-0.8-1-1-0.8-0.50.10.71.11.10.90.5-0.1

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 (20,4,5,8)
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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.